Williams AV Digi-Wave 400 Series User manual

Digi-Wave™400 Series
Digital Transceiver and Receiver
USER MANUAL
DLR 400
DLT 400
MAN 241I-1122

Digi-Wave 400 Series Digi-Wave 400 Series
32
Digi-Wave™ 400 Series
DLT 400 Digital Transceiver and DLR 400 Digital Receiver
Contents
Safety Warnings and Recycling Instructions ....................................................................................................................................................3
System Overview ..................................................................................................................................................................................................................4
DLR 400 ALK Differences................................................................................................................................................................................................4
DLT 400 Controls and Connectors............................................................................................................................................................................5
DLR 400 RCH Controls and Connectors...............................................................................................................................................................5
General Operation ...............................................................................................................................................................................................................6
Before Programming the Digi-Wave™ System ..............................................................................................................................................7
The Main Screen ..........................................................................................................................................................................................................9
Setting Up the Digi-Wave™ System....................................................................................................................................................................... 11
Language......................................................................................................................................................................................................................... 11
Initial Setup .................................................................................................................................................................................................................... 11
Changing Settings............................................................................................................................................................................................................. 12
Basic Settings .............................................................................................................................................................................................................. 12
Advanced Settings ................................................................................................................................................................................................... 12
Interpretation Mode Features.................................................................................................................................................................................... 17
Floor and Interpreter .............................................................................................................................................................................................. 17
Repeater Broadcast Mode..................................................................................................................................................................................18
Standard Interpretation Mode.........................................................................................................................................................................18
Bilingual Mode............................................................................................................................................................................................................ 19
Relay Mode ..................................................................................................................................................................................................................20
Court Mode............................................................................................................................................................................................................................20
Saving and Replacing Profiles.................................................................................................................................................................................. 22
Differences between DLT 400, DLT 300, DLT 100 2.0 & DLT 100......................................................................................................... 22
Microphone/Headset Jack Difference................................................................................................................................................................. 23
Differences Between Historical Digi-Wave DLTs ......................................................................................................................................... 23
Updating DLT 400 and DLR 400 RCH Firmware.........................................................................................................................................24
Troubleshooting................................................................................................................................................................................................................. 25
Specifications - DLT 400 Transceiver................................................................................................................................................................... 27
Specifications - DLR 400 RCH Receiver.............................................................................................................................................................28
Specifications - DLR 400 ALK Receiver..............................................................................................................................................................28
2-Year Warranty................................................................................................................................................................................................................... 32
Safety Warnings and Recycling Instructions
HEARING SAFETY
CAUTION!
This product is designed to amplify sounds to a high volume level which could potentially cause hearing damage
if used improperly. To protect your hearing and the hearing of others:
1. Turn the volume down before putting on the earphone or headphone, and then adjust the volume to a
comfortable level,
2. Set the volume level at the minimum setting that you need to hear,
3. If you experience feedback (a squealing or howling sound), reduce the volume setting and move the
microphone away from the earphone or headphone.
4. Do not allow children or other unauthorized persons to have access to this product
MEDICAL DEVICE SAFETY
CAUTION!
1. Before using this product with an implantable or other medical device, consult your physician or the
manufacturer of your implantable or other medical device.
2. If you have a pacemaker or other medical device, make sure that you are using this product in accordance
with safety guidelines established by your physician or the implantable device manufacturer.
BATTERY SAFETY
CAUTION!
DLT 400 and DLR 400 RCH internal battery pack.
To reduce the risk of fire or burns, do not attempt to open, disassemble, or service the battery pack. Do not crush,
puncture, short contacts or dispose of in fire or water. Do not incinerate or expose to temperatures above 140ºF
(60ºC). Replace only with battery pack designated for this product: a rechargeable Lithium-polymer battery.
Recycle or dispose of properly.
CAUTION!
The lithium batteries used in the DLT 400 and DLR 400 RCH provide great performance and long life. But, like all
lithium batteries, they do have a limited number of charge/discharge cycles. Lithium batteries may experience
swelling if used beyond their expected life cycle (2 years). If you notice swelling of the battery, please discontinue
use and have the battery replaced. We recommend battery replacement after 2 years of use. For more informa-
tion about replacing the battery, please visit our website at:
http://www.williamsav.com/digiwave-battery-replacement.
RECYCLING INSTRUCTIONS
Battery Safety and Disposal
Help Williams AV protect the environment! Please take time to dispose of your equipment properly. Please
do NOT dispose of batteries in the household trash. Please take the batteries to a retail or community
collection point for recycling.
Product Recycling:
Please do NOT dispose of your Williams AV equipment in the household trash. Please take the equipment to an
electronics recycling center or return the product to the factory for proper disposal.

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System Overview
The Digi-Wave communication system allows users to listen and talk to one another wirelessly in a variety
of scenarios. A Digi-Wave system consists of at least one transceiver (DLT 400) and various combinations of
transceivers and receivers (DLR 400).
The DLT 400 is a two-way transceiver, meaning that it can transmit and receive audio simultaneously.
The DLR 400 is a receiver only. Users of DLR 400 receivers can only hear what is being broadcast by DLT(s); they
cannot create any audio. There are two models of DLR: the DLR 400 ALK and the DLR 400 RCH. For information
on the differences, see “DLR 400 ALK Differences” on page 4.
For simplicity, throughout the rest of this manual, the DLT 400 may be referred to as a “DLT.” The DLR 400 RCH
and DLR 400 ALK as a “DLR” when the behavior of both devices is the same.
Combinations of one or more DLT’s and DLR’s can be used to facilitate different events, depending on what
needs to be spoken and what needs to be heard. Examples of scenarios will be covered here.
Typical Scenarios include:
• Guided Tours - with one or more tour guides (2-way), with audience participation (2-way), or without
audience participation (1-way)
• Language Interpretation - one or more interpreted languages transmitted to audience (1-way)
• Intercom - with up to six people able to speak simultaneously (2-way)
There are many more scenarios than are covered in this manual, however these would be variations on the ones
discussed here.
Backwards Compatibility
The Digi-Wave 400 Series is backward compatible with the 300 series with limited features.
It is not backward compatible with any earlier transceivers or receivers (DLT 100, DLT 100 2.0, DLR 50, DLR 60,
and DLR 60 2.0).
The Technology
The Digi-Wave™ system is a digital spread-spectrum (DSS), simultaneous two-way wireless listening system
operating in the 2.4 GHz band. Due to it’s frequency-hopping algorithm, it avoids interference and is a very
secure method of communication. For a more detailed explanation of how Digi-Wave technology works, please
visit our website and download the “Digi-Wave™ Technology White Paper”.
DLR 400 ALK Differences
The DLR 400 ALK uses 2 AAA alkaline batteries rather than a rechargeable
battery like the DLR 400 RCH.
The AAA alkaline batteries can be inserted by removing the panel on the back
of the device and putting the batteries in place with the correct polarity. When
changing batteries, always change both batteries at the same time.
Help Williams AV protect the environment! Please recycle batteries once they
are drained.
Other Differences
The DLR 400 ALK allows you to select a group via the up and down arrows on
the front of the device. The volume may be adjusted using the vol buttons.
There is no menu system otherwise.
The battery and signal strength indicators on the screen work similarly to the
DLR 400 RCH, but are located on the far left of the screen.
When discussing DLR Receivers, this manual is usually referring to the DLR
400 RCH.
DLT 400 Controls and Connectors
Menu/Select
Talk Button
Power Button
Up and Down Buttons
Headphone and Microphone Jack
Volume
Adjust
USB-C Charging Port
Charging LED
Charging Contacts
(For CHG 412)
Internal
Microphone
DLR 400 RCH Controls and Connectors
Menu/SelectPower Button
Up and Down Buttons
USB-C Charging Port
Charging Contacts
(For CHG 412)
Volume
Adjust
Headphone Jack
Charging LED

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General Operation
Button Functions
Power Button
· Press and hold for power On/Off
· Press quickly to navigate back a step when using the menu.
Volume Control Buttons (on side)
· Adjust the headset’s volume.
Talk Button
· The talk button will need to be used in order to talk or stop talking. There are two modes for the Talk button.
For more details, see “Talk Mode: Push-to-Talk and Push-n-Latch (DLT Master 2 and Guest Only)” on page
14.
· This button is only on the DLT transceivers.
· Devices with a Master 1 or Master 2 Speaking Priority can override any speaking Guests by holding down talk
button.
Menu/Select Button
· Press once while on the main screen to view additional Digi-Wave Information, such as firmware version.
· While on the main screen, hold the menu button down for a few seconds to enter the settings menu.
· While in the settings menu, press the menu button to select the highlighted option and move onto the next
step.
· While in the settings menu, hold the menu button to exit the menu.
Up and Down Buttons
· Navigate through menu items.
· Adjust settings
· In Bilingual Mode, toggle which language is spoken.
Locking the DLT Buttons and Screen
Basic Lock
Lock enables the Administrator to prevent unauthorized changes to the system set-up by preventing the user
from accessing the menu and using the up and down arrow buttons.
NOTE: Each DLT has to be locked and unlocked individually.
· To enable or disable the lock, hold down the volume up button and hold the menu button at the same time
for 2 seconds. The lock icon will appear
· When lock is enabled, the menu system will have most features unavailable with a lock icon displayed next
to it.
Locking/unlocking DLR Buttons and Screen
Locking prevents the user from changing Group/Channel. While locked, Volume up/down and Power on/off can
still be changed.
DLR 400 ALK
To lock:
· Hold the ^ and Vol+ buttons down together until the word “GROUP” begins flashing.
· Rapidly press the ^, ^, v, v buttons and “SL” will be displayed.
· The unit is now locked.
To unlock:
· Rapidly press the ^, ^, v, v buttons and then hold down the ^ and vol+ buttons (together) until the word
“GROUP” begins flashing.
· Verify the Group Number displayed is the desired group. If not, change it with Vol+/Vol- buttons.
· Hold down the ^ and vol+ buttons (together).
· The unit is now unlocked.
DLR 400 RCH
To lock: Hold the Vol+ (on the side) and Menu/Select buttons down together until appears on the screen.
To unlock: Hold the Vol+ (on the side) and Menu/Select buttons down together until appears on the screen.
Battery Charging
Use the USB-C located on the bottom of DLT transceiver or the DLR 400 RCH Receiver, to charge the battery.
Charge by either using a USB-C cable or using an approved, compatible Williams AV charging station.
Full charging time is approximately 5hours. The charging LED flashes red while charging. The charging LED
will turn to a steady green light when the battery is charged.
NOTE: The DLR 400 ALK receiver uses alkaline batteries and is NOT rechargeable. Do not place these models
in a charging station.
Additional information
· The DLT 400 transceiver uses an internal rechargeable Lithium Polymer battery.
· The DLR 400 RCH receiver is rechargeable and uses a Lithium Polymer battery. Do not charge the DLR 400
ALK.
· Charge the battery at room temperature.
CAUTION!
All lithium batteries have a limited number of charge/discharge cycles. Lithium batteries may experience swell-
ing if used beyond their expected life cycle (~2 years with casual usage. Heavy usage will reduce the life cycle). If
you notice swelling of the battery, please discontinue use and have the battery replaced. We recommend bat-
tery replacement after 2 years of use.
Before Programming the Digi-Wave™ System
Depending upon the mode chosen, up to six people can talk in a group at any given time. The Master 1 will
have first priority, Master 2 has second priority and Guest units have third priority. When two or more people
are talking in a group, the participants can hear their voices with the DLT transceivers or DLR receivers, but only
those with a DLT transceiver have a microphone and can speak.
Modes
The Digi-Wave 400 system has been designed for ease and flexibility. Many of the settings are automatically
configured for common use cases. These use cases are Tour Mode, Intercom Mode, Hearing Assistance Mode
and Interpretation Mode.
While the modes are named by their most common usage, select the mode that fits your personal use case
best. The mode is a just starting point; advanced settings can be adjusted to fit your situation.
Modes
Tour
Tour mode is best suited when one or two people are leading a large group. The group can be configured to
only listen to the leader(s) of the group, such as on a museum tour. Alternatively, this mode allows people with a
transceiver to speak, which may be useful for tours through noisy areas where hearing may be difficult, such as
factory tours.
Intercom
Intercom mode is appropriate when a group of up to 6 people all need to talk to and hear one another. It may
be used behind the stage to manage a large theater production, or for a security team at a club.
Hearing Assistance
Hearing Assistance mode is appropriate when using the device to amplify spoken communication between
users. The Tone Control in Hearing Assistance mode is automatically elevated, allowing the user to hear more

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clearly. Users with transceivers can be allowed to speak, which may be useful in a classroom setting.
Interpretation
Interpretation mode is best suited when dealing with multiple, simultaneous audio feeds. In normal
interpretation mode, an interpreter may be translating a speech given in Spanish into English, a group of
interpreters may be translating a speech in English into several languages. Up to 14 languages and the floor
may be broadcast on the Digi-Wave system at one time.
Court
Court mode allows toggling between secured groups, without letting the Guest unit on an unused or incorrect
Group. A Guest unit can access up to four pre-selected groups, but nothing else. Although this mode is named
Court Mode, this mode can be used whenever a limitation to group selection is needed.
Interpretation Mode: Broadcast Type
When in Interpretation Mode, you will be required to select a broadcast type. The broadcast type helps
determine which channel the DLT transceiver will broadcast on.
Floor will broadcast on channel 0. This is intended to be the main audio for the event that is being interpreted.
Interpreter will broadcast on channel 1 - 14 depending on what is available. Each channel is able to be used by a
dedicated interpreter. All interpreter units can hear the Floor on channel 0, and transmit the Interpreter’s voice
on channels 1 - 14. At any time, by changing channels, anyone can listen to the Floor on Ch. 0 or any Interpreter
on channels 1 - 14. The interpretation is broadcast 1-way in up to 14 languages.
Repeater is used to extend the range of the Digi-Wave 400 system by up to 50%. The repeater will broadcast on
one channel, depending on which channel(s) needs to be extended. This mode does not require a person to be
speaking or listening to the transceiver.
For more information on additional features of Interpretation Mode, see “Interpretation Mode Features” on page
17.
Speaking Priority
There are 3 levels of priority.
• Master 1 has first priority, and also sets up a majority of the settings for the Digi-Wave system. There
can be only one Master 1 unit per group.
• Master 2 has second priority when speaking, but does not declare any settings for the Digi-Wave
system, only for their personal device. This is not available in Interpretation mode.
• Guest units have third priority, and can only declare settings for their personal devices.
The Master 1 and Master 2 have the ability to lock out other talkers by holding down the Talk button for three
seconds. All system Talk LEDs will continuously flash while other participants are locked out of the Talk feature.
The Master 1 can override anyone else talking within the group. Master 2 has talking priority over Guests.
The Master 1 or Master 2 must have their talk button deactivated to allow the Guest units to talk. When 2-6
people are talking in a group, the participants can hear their voices in the DLT transceivers or DLR receivers.
DLR receivers can only listen, as they do not have a microphone or talk button.
If a Master 1 unit leaves the conversation, the other devices in the group cannot continue the conversation
without them. A Master 1 must be present for the Digi-Wave system to be used.
Groups and Channels
Depending on the Mode you select, you will primarily be working with Groups or Channels. Both settings
determine who hears the audio, and are very similar in concept.
Groups are used in every mode. A group is a selection of people communicating with one another. For instance,
there may be one tour group for a basic tour and another tour group for a VIP tour. Both these groups may be
in the same area, but their audio will not overlap since they are in different groups.
Channels are used in Interpretation mode. Users configure their device to listen to a certain channel based on
what they need to hear. For instance, in Interpretation mode, their may be a channel per language. Users will
listen to the channel for the language they speak, and not hear the audio for languages they do not understand.
In a theatre with two showrooms, the Digi-Wave system may have a group for each theater. Each group may
have up to 15 channels of audio in use. Each user will need to be assigned the correct group for the theater they
are sitting in, as well as the correct channel for the appropriate audio.
Addresses
Addresses are unique numbers given to each Digi-Wave transceiver in a set up. Typically, addresses will be
automatically assigned but in some use cases, manual assignment may be necessary. If manually assigning
addresses, make sure each address is unique; addresses between 0 and 1023 can be selected. Each of the 1024
addresses is available per group.
DLR receivers do not have addresses.
Selecting Group(s) and Channel(s)
Each set of people who want to talk and/or listen to each other must be in the same group. Up to 4 Groups can
operate simultaneously within range of each other. Up to 15 channels can be used simultaneously.
Group numbers and channels are selected via the settings menu. Pressing the up or down button will allow you
to manually select the group or channel number.
Profiles
Configurations of settings can be saved to a Profile to be easily reloaded later. A profile may be created on any
device and loaded later. Profiles are useful when Digi-Wave devices are used in multiple ways, such as being
used for both Tours and Hearing Assistance.
General Rules of Operation
The following rules must be followed. Failure to adhere to these rules will result in unpredictable,
unsupported operation.
• There must be only one Master 1 per group.
• Master 2 is optional, and there can only be one per group.
• Any other DLT 400 units must be a Guest unit.
• Each DLT transceiver must have its own address and the address cannot be duplicated within a group.
• Each group must be assigned its own group number. Williams AV recommends a maximum of four
groups using the system simultaneously within the same area to prevent interference.
• When using four simultaneous groups, group numbers must be sequential. i.e. 11, 12, 13, 14. Any numbers
0-1023 can be used (only 0-99 if DLR 360 or DLT 400 ALK receivers are being used).
The Main Screen
Display Settings
The mode will be displayed at the top of the screen, between the signal strength indicator and the battery level
indicator.
Depending on your setting selections, the clock, the channel or the group will be displayed in the center of the

Digi-Wave 400 Series Digi-Wave 400 Series
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screen. Channel or Group is determined by your mode. A large or small clock is determined by the Master 1
settings.
To change any of these settings, hold down the menu button. For instructions on configuring the Digi-Wave
system, see “Basic Settings” on page 12.
Signal Strength Indicator
When a Master 1 is available on the group or channel, the signal strength indicator on DLR Receivers and
Guests will indicate how strong the signal is.
When a Master 1 is not available OR while the Master 1 is changing settings that may affect other devices, the
icon will disappear. Once the Master 1 has been set up, the DLR Receiver and other DLT transceivers should
rejoin the group or channel automatically (with some exceptions, such as a Security PIN being set).
Attendee Checking
The number of DLT transceivers currently talking will be displayed in the bottom right corner box. It does not
count DLR Receivers because they do not have a talk button.
Priority Indicator
A label indicating Master 1, Master 2 or Guest will appear on the lower left of the screen on the main screen.
If the label is blinking, the device has not had its settings configured. Enter the menu system to begin
configuring the device.
Setting Up the Digi-Wave™ System
Settings of the Digi-Wave system should be selected based on how the system will be used. A Master 1 device
will declare a majority of the settings and pass these settings to devices that connect with it. Since the Master
1 automatically sets most settings, there is little to be set up on Guest devices for basic usage of the Digi-Wave
system.
For more information on terminology and a general system overview, see “Before Programming the Digi-
Wave™ System” on page 7.
Language
The Digi-Wave menu is available in multiple languages. Select the language you desire for set up.
Initial Setup
When a DLR Receiver or a DLT transceiver is first started, some settings will need to be
selected before the device can be used. There are three ways to load settings on a
Digi-Wave device:
New Settings
To start from the very beginning with your Digi-Wave settings, select New Settings. This will start you at the
beginning of the set-up process where you can set Basic Settings (see “Basic Settings” on page 12).
Load Profile
To load an existing profile on the device, select this option and then select the profile to load. You may either
load a profile as it is, or adjust the settings once it is loaded (see “Basic Settings” on page 12).
Join Group
If a Master 1 is already leading a Group or Channel, Digi-Wave 400 transceivers and receivers can automatically
search for the group and join it. The list of available groups will be in the order the device detects them, which
may not be in numerical order.
The group or channel number could also be manually entered from this screen. Settings will be loaded from
the Master 1 device, once a connection is established.
If a group or channel is locked by a PIN, the device will prompt for the PIN at this time. The device will be unable
to join the group or channel without this PIN.
For interpretation mode, a Master device should not use this feature. They will be unable to select the
channel they desire. Please configure the device using the normal setup menu. Guest units can use the Join
Group function normally.
When using this feature to join a group, Addresses will be automatically set. If you need manual addresses, the
DLT 400 will need to be set up using a profile or through setting up New Settings.
If the group should not be able to be automatically joined, this feature can be disabled by the Master 1 device for
specific groups. See “Allow Join Group” on page 16 for more information.

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Changing Settings
If settings need to be adjusted later, the menu system can be reentered at any time by holding down the menu
button for a few seconds. From there, settings can be edited by selecting New Settings. You may also load a
profile or join a group or channel.
The menu system can be exited at any time by holding the menu button. Any uncustomized settings will be set
to their default.
To go back to a previous setting while in setup mode, press the Power button.
Basic Settings
Always start setting the Digi-Wave settings with the DLT transceiver that will be the Master 1. Other devices can
gather their settings from the Master 1 device to ease setup. DLR Receivers and other DLT transceivers that are
not Master 1 may still need their settings adjusted, but they should still be set up after the Master 1.
1. Select a Mode. This determines what other settings may be available. See “Modes” on page 7 for more
details on the various modes.
2. Select Speaking Priority. If this is the first DLT transceiver you are setting up, you will want to select Master 1.
Typically, all other units will be Guest priority. See “Speaking Priority” on page 8 for more details on the
various speaking priorities.
3. Select the group number. Holding down the up or down button will seek for available groups/channels.
Pressing the up or down button will allow you to manually select the group or channel number. For more
information on groups, see “Groups and Channels” on page 8.
4. If in Interpretation Mode, set the Broadcast Type (see “Advanced Settings” on page 12).
5. The Master 1 can select a handful of options that will affect the main display on other devices:
• Select whether to display clock or hide it entirely.
• Select the clocks location, if displayed.
• Select whether the clock is a 24-hour or 12-hour clock.
• Set Master 1 manual address. (Guests and other device can set the address under Advanced Settings.)
Automatic address selection is recommended unless there is a need to override the address.
6. Enter Advanced Settings (See “Advanced Settings” on page 12) if more customization is needed, otherwise
the device is ready to be used.
Advanced Settings
Advanced Settings are usually available regardless of the mode selected, but some Advanced Settings may be
missing from certain modes, or with certain configurations.
Number of Microphones (DLT 400 only)
In modes where multiple speakers are available, the number of speakers at one time can be limited. The
maximum number of speakers is 6, the minimum is 2 when this option is available. The number of microphones
is not limited by the selected mode (except for in Interpretation Mode, which assumes one speaker per
channel). Users with DLR Receivers do not have microphones or talk buttons and cannot be speakers in any
circumstance.
Only 4 speakers using DLT 300 transceivers are allowed. 6 speakers can still be in the group, but the 5th and 6th
speakers must be using DLT 400 transceivers.
Example - Tour System
The system has been configured so that up to four people can have open microphones and be talking at the
same time. One DLT is set up as a Master 1 unit for the tour guide. Each tour member has a DLT transceiver set up
as a Guest unit.
When a 5th person desires to speak, they push their talk button. This deactivates the talk button of the first Guest
that turned their microphone on. This First-In-First-Out speaking priority continues each time a member pushes
their talk button who is not a part of the speaking group.
If the group speaking needs the 5th person to be able to speak, they can adjust their device settings to allow 5
speakers.
The Master 1 or Master 2 Tour Guide has the ability to take control of the discussion by overriding Guest units, if
needed. This is accomplished by pushing-and-holding their talk button down for a few seconds which mutes all
Guest unit microphones. When overriding, the talk button will blink red.
A second Tour Guide may be added as a Master 2 unit, which takes priority over Guest units. Master 1 and 2
units have two-way communication capability; they can talk/listen simultaneously to one another.
TOUR MEMBER 2 TOUR MEMBER 3 TOUR MEMBER 4
TOUR GUIDE TOUR MEMBER 1
TOUR MEMBER 4 (THE 5th UNIT) CAN LISTEN TO THE GROUP -OR- CAN TALK BY PUSHING TALK BUTTON AND KNOCKING TOUR MEMBER 1 OFF
-BUT- ONLY 4 PEOPLE CAN TALK AT THE SAME TIME (4 OPEN MiCROPHONES MAX)
TOUR GUIDE MODE
SUPPORTS UP TO
4 OPEN MICROPHONES

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Example - Intercom
One DLT transceiver is set up as a Master 1 unit. All other DLT transceivers are programmed as a Guest unit. Up
to six people can have open microphones and be talking at the same time. When a 7th person desires to speak,
they push their talk button. This deactivates the talk button of the first Guest that turned their mic on. This First-
In-First-Out order continues each time a member pushes their Talk button who is not a part of the speaking
group.
INTERCOM FEATURE
SUPPORTS UP TO SIX
SIMULTANEOUS TALKERS.
DLT 300
programmed as
Guest
DLT 400
programmed as
Guest
DLT 300
programmed
as Guest
DLT 400
programmed
as Guest
DLT 400
programmed as
Master 1
DLT 400
programmed as
Guest
Talk Mode: Push-to-Talk and Push-n-Latch (DLT Master 2 and Guest
Only)
On a DLT transceiver, the Master 2 or Guest Talk Mode can be changed to Push and Latch or Push to Talk.
Master 1 DLT transceivers are always set to Push-N-Latch mode. This feature is not available on a DLR Receiver
as it does not have a microphone or talk button.
In Push-n-Latch mode, when the talk button is pressed and released, it stays in talk mode until the talk button
is pressed and released again.
In Push-to-Talk mode (the default mode), the talk button must be held down while speaking, and when
released, it shuts off.
Tone Control
The default for tone control is 5, unless in Hearing Assistance mode, where the default is 9.
Using the up and down arrow buttons, adjust the tone up or down to your preference. The number range
indicates:
• 1 = Most bass response
• 5 = Flat
• 9 = Most treble response
Side Tone Adjustment
This gives the user the ability to change the volume of their own voice as heard in the headset (side tone). This
feature is only available on the DLT transceiver.
Use the up and down arrow buttons to choose between off (0 dB), low (-12 dB), or high (-6 dB).
Microphone Gain, Line Input Gain and Line Output Gain
Gain can be used to increase the volume of the microphone or line input sound. Line input is connected via a
USB-C connector.
Use the up and down arrows to adjust the gain to a suitable level. The default value for the microphone gain is
33. The default value for the line input gain is 5. The default value for line output gain is 0, but can be adjusted to
+4dB.
Note: For setting up an input line interface, please contact TechBlue Technical Support.
Display Clock
The clock can be displayed in several formats on the main screen. It can be shut Off, displayed Big in the center
of the screen, or displayed Small near the bottom of the screen (default behavior).
The group or channel will be displayed at the bottom of the screen in small font if the clock is set to display big.
The group or channel will be displayed in the center of the screen if the clock is set to off or small.
Manual Group and Address
If the Group or Address needs to be adjusted, it can be set here. This may be necessary if needed to be
backwards compatible with the DLT 300 or DLR 360 from the previous generation.
Encryption
Extra security can be added to the transmitted signal via encryption. The “300 Compatible” 87-bit encryption
is default. This level of encryption is backwards compatible with the DLT 300 from the previous generation. The
DLR 360 cannot work with encrypted signals.
128 + 87-bit Encryption adds AES-128 encryption on top of the 87-bit encryption. This adds an additional layer
of security, but is not backwards compatible and may only be used with Digi-Wave 400 devices. This method
requires an Encryption PIN.
Encryption PIN:
When a group or channel has been set up with a Encryption PIN, master and
guest transceivers and DLR 400 receivers without this Encryption PIN entered
cannot listen in on the group. This may be desirable in private or high security-level
functions. The PIN cannot be used with DLR 400 ALK units.
The same four digit code must be programmed into all of the Digi-Wave devices
in the group. If a different secure code has been entered, participants cannot re-enter the group without re-
entering the correct secure code. The only time the Encryption PIN is displayed is when it is being entered. As
the PIN is being entered, individual numbers will be replaced by the * symbol.
We recommend using a unique PIN to your group. Using PIN 0000 or other easily entered or guessed PIN
will not be as effective as a unique pin.

Digi-Wave 400 Series Digi-Wave 400 Series
1716
To set the PIN:
1. Select whether or not the connection requires a PIN. If yes, you will be prompted to enter the desired PIN.
2. Choose a 4 digit numerical code; i.e. 4297. You must use the same code on each device in the group.
3. Using the up and down arrows, enter first digit of the code (0 – 9).
4. Press the menu/select button to move to the second digit. Enter the next digit and continue until all four digits
have been entered.
When setting up the other transceivers or receivers for this group or channel, enter the same code into those
devices.
When the Encryption PIN is set, a key icon will show on the main screen under the signal strength indicator.
To remove an Encryption PIN when using 300 Compatible mode (Pins are required in 128+87 mode):
1. Go through the menu system until you are prompted if you would like to use a PIN code.
2. Select “NO PIN CODE.” The existing PIN will be removed.
Allow Join Group
The Master 1 can prevent other devices from seeing the group as available to join. Disabling Join Group will
prevent available groups from being listed under the Join Group menu. Devices will have to be manually set to
the correct group or channel.
See “Join Group” on page 11 for more details on the Join Group feature.
Factory Reset
If the Digi-Wave device is not behaving correctly, or otherwise needs to be reset, a factory reset option is
available. This is the last item in the Advanced Settings menu. If the device is reset, all changes selected before
this reset will be lost.
The factory reset can also be done manually. A hole is on the back of the device. The hole covers a switch that
can only be reached with a paper clip or other thin material. Pressing the button with the paper clip while the
device is on will display a prompt on the screen asking to perform a factory reset. Select Yes to reset the device.
Interpretation Mode Features
Interpretation Mode has several features not available in other Digi-Wave modes.
During setup, you will be prompted to select a broadcast mode and select an additional interpretation mode.
The available options for broadcast mode are Floor, Interpreter and Repeater. The available options are for the
additional interpretation mode are Standard, Bilingual and Relay.
Floor and Interpreter
The floor is the main speaker or audio of the event. In a lecture, this is the person standing at the podium.
Interpreters translate the audio from the floor into another language. There can only be one floor in a Digi-Wave
system, but there can be up to 14 interpreters.
The floor will always broadcast their audio on channel 0. Interpreters
Main speaker (floor)
CH 0
CH 1 CH 2 CH 3... CH 14
GUEST
CH 0 CH 1 CH 2 CH 3... CH 14
MASTER
GUEST REPEATERS
CH 0 CH 1 CH 2 CH 3... CH 14
DLT TRANSCEIVER OR DLR RECEIVER
can broadcast their audio on channels 1-14. Interpreters can listen to channel 0 as they interpret in standard
interpretation mode.
Repeater Broadcast Mode
Repeater mode can be entered by selecting it as the Broadcast Type during setup.
An additional DLT 400 can be set-up as a repeater to increase the range of each channel.
When repeater mode is used, the Repeater is configured as the Master 1, and all units sync to this Master
Repeater. The floor unit should be configured as a guest.
There can only be one repeater per channel and one of the repeaters must be a Master unit. In basic scenarios,
it is best to set the Repeater on Channel 1 since most connecting devices can easily access this channel.
Standard Interpretation Mode
Standard interpretation mode allows for each DLT transceiver to listen to the floor (the main speaker) on
channel 0 and broadcast out in one interpreted language on a channel (1-14). Each additional channel or

Digi-Wave 400 Series Digi-Wave 400 Series
1918
language requires their own DLT transceiver and interpreter. The audience member then listens to the channel
for their specific language.
Note: In previous Digi-Wave versions, this was known as Simultaneous Interpretation Mode.
CH 2 CH 3
CH 1
CH 0
INTERPRETER
Listening on Ch. 0
Speaking on Ch. 1
(French)
INTERPRETER
Listening on Ch. 0
Speaking on Ch. 2
(Spanish)
INTERPRETER
Listening on Ch. 0
Speaking on Ch. 3
(German)
THE AUDIENCE LISTENS TO
THE CHANNEL OF THEIR
LANGUAGE
Listening
Ch. 3
German
Listening
Ch. 0
English
Listening
Ch. 1
French
ALL INTERPRETERS
ARE LISTENING TO
THE MAIN SPEAKER
ON CHANNEL 0
EACH INTERPRETER
SPEAKS/TRANSMITS
ON A DIFFERENT
CHANNEL
Listening
Ch. 2
Spanish
MAIN SPEAKER/
FLOOR
Speaking on Ch. 0
(English)
Bilingual Mode
Bilingual mode allows the interpreter to quickly switch their output
channel between Ch. 1 or Ch. 2, depending on which language the
audience needs to hear.
This mode eliminates the need for the interpreter to physically switch
between 2 DLT transceivers programmed to fixed channels. The
interpreter can easily switch between which channel is being broadcast by
using the up or down arrow under each channel listed.
For example, the Floor changes from a Japanese speaker to an English speaker. When the Floor is speaking
Japanese, the bilingual interpreter selects Ch. 1 as the output channel and interprets Japanese to English to
the English audience. When the Floor changes to a English speaker, the interpreter selects Ch. 2 as the output
channel and interprets English to Japanese to the Japanese audience.
The DLT transceiver in Bilingual Mode always listens to channel 0, regardless if channel 1 or 2 is chosen as the
transmission channel. Only one DLT transceiver can be programmed to transmit on channels 1 and 2.
The bilingual interpretation mode may be utilized within a larger system. For example, one interpreter can use
the bilingual mode on channel 1 and 2, while others have the normal mode on other channels. It does not work
with Relay Mode.
When the
Presenter speaks Japanese,
Interpret in English
On CH 1
Interpreter
1 2 Ch 2 Japanese
Ch 1 English
CH 2CH 2
Ch 2
Japanese
Audience
CH 0
When the
Presenter speaks English
Interpret in Japanese
On CH 2.
Presenter
(Floor)
CH 1CH 1
Ch 1
English
Audience

Digi-Wave 400 Series Digi-Wave 400 Series
2120
GROUPS
10/11/12
11
MASTER
12
MASTER
GROUPS
10/11
GROUPS
10/12
GROUPS
10
10
MASTER
INTERPRETER
CLIENTCLIENT
COUNCILCOUNCIL
JUDGECOURT
REPORTER
Device Availability
Court Mode is only available for DLT 400 transceivers and DLR 400 RCH receivers. It is not available for DLR 400
ALK units or for backwards compatibility with the Digi-Wave 300 Series.
For older Digi-Wave 400 series units, a firmware update may be required to use Court Mode.
Group Selection
A Master unit can only be in one group and cannot toggle between groups. Like most other modes, the Master
unit will be programmed with the settings for one specific group.
Guest units can access up to four groups. The Guest will be able to add up to four groups. If a PIN code has been
set up for the group, the Guest will be required to enter it when they add the group. PIN codes are only available
in with Encrypted signal transmission.
Both the Master and any Guest devices must be set to either encrypted or unencrypted signal transmission.
Once the setting for Court Mode have been saved on a Guest device, any Group previously accessible by the
unit will be erased from the device. All groups the Guest unit should be allowed access to will need to be
entered at once. A single group cannot be added or removed later.
Toggling Between Groups
Once setup is complete, the Guest unit can use the Up and Down buttons to toggle between the list of groups
on the left hand side of the screen.
The Guest indicator will flash until the group is joined. If a device seems unable to join a group, check the PIN
code.
Locking the Device
To prevent Guest units from accessing the setup menu, using Basic Lock is recommended. Basic lock can be
activated by holding the volume up button and menu button at the same time for a few seconds.
Guest units can still edit some personal auto settings by repeatedly pressing (not holding) the menu button.
These settings include viewing the System Information, and Adjusting Mic Gain, Side tone, and Tone. Volume is
adjustable using the volume up and volume down buttons.
Microphone Mute
Court mode requires Push-n-Latch mode. Push-to-Talk mode is not available in Court mode. To mute your
microphone, press the Talk button so the red light around the Talk button is no longer on.
Holding down the talk button will not mute all speakers in court mode.
Relay Mode
CH 0CH 0
Ch 0
Japanese
Audience
Japanese
CH 1 CH 1
Ch 1
English
Audience
English
Listening to the Floor
Listening to the Floor
(”FL” selected)
Listening to the Relay
(”re” selected)
CH 0
Presenter
(Floor)
Japanese
FL 1
Interpreter #1
Ch. 1 (Relay)
Japanese-English
re 2
Interpreter #2
Ch. 2
English-Spanish
CH 2 CH 2
Ch 2
Spanish
Audience
Spanish
Relay Mode allows the interpreter to quickly switch
between listening to the Floor on Channel 0 or the
Relay on Channel 1.
For example, the floor is speaking Japanese. The
Japanese audience can listen to the Floor on Ch.
0. Interpreter 1 pushes the down button to hear
the floor, and interprets Japanese to English to the
audience listening on Ch. 1. Interpreter 2 speaks
English and Spanish, and cannot translate from
the floor as they do not speak Japanese; they need
to listen to Interpreter 1’s translation as a relay.
Interpreter 2 listens to the relay (Interpreter 1) by
pushing the up button and interprets English to
Spanish to the audience listening on Ch. 2.
Channel 1 is automatically the Relay channel.
Channel 1 will automatically listen to Channel 0,
just as in Standard Interpretation Mode. The DLT
transceiver transmitting on Channel 1 cannot switch
and listening to Channel 1, and the floor cannot
listen to channel 1. Interpreters on other channels
(2-14) are able to switch which channel they are
listening to.
Only one DLT can be programmed to transmit
on each channel. All interpreter units must be
programmed in the Interpretation with Relay Mode,
and cannot be combined with units programmed
in other modes.
Note: Bilingual Interpretation is unavailable in Relay Mode.
Court Mode
Court mode may require a firmware update to version 1.2.0 or higher to be available on your Digi-Wave
devices.
Court mode is used to limit users to specific groups. When not in court mode, a guest Digi-Wave unit can
change their group to any group. In Court Mode, the guest unit can only access up to four pre-selected groups.
Limiting the access to groups may be useful in situations requiring privacy and security, such as in a court. For
example, a lawyer may need to privately consult with their client on Group 12, and may also need to listen to the
judge on Group 10. To prevent the lawyer from accidentally broadcasting private case information on any other
Group, the lawyer would be limited to only accessing Groups 10 and 12.
PIN codes can be assigned to a Group to further secure access to a group. Court mode has the added benefit of
quickly toggling between groups, even if they require a PIN code, without letting the Guest unit end up on an
unused or incorrect Group.
Although this mode is named Court Mode, this mode can be used whenever a limitation to group selection is
needed.

Digi-Wave 400 Series Digi-Wave 400 Series
2322
Function/
Description DLT 400 DLT 300 DLT 100 2.0 DLT 100
Talk Timer
function Not available.
Not Available; Group
number displayed in
place of Talk Timer on
Main Screen
Not Available; Group number
displayed in place of Talk
Timer on Main Screen
Available
Push-to-Talk and
Push-and-latch
functions
Available on Guest
units only
Available on Guest
units only Available on Guest units only Not Available
Microphone
Gain Max Level 53 53 53 63
Side Tone
Adjustment
St: Off, low = -12 dB, high
= -6 dB
St: 0=off, St: 1=-6 dB, St:
2=-12 dB
St: 0=off, St: 1=-6 dB, St: 2=-12
dB Not Available
Dock detected/
Mic Disable Available with adapter
Available; The DLT 100
2.0 is compatible with
a dock.
Available; The DLT 100 2.0 is
compatible with a dock.
Not available. The DLT
100 is not compatible
with a dock.
Auto shutoff
timing for Guest
Units
5 min. 5 min. (Same as DLR
360) 5 min. (Same as DLR 60 2.0) 2 min.
Line Input or
Output Level
Adjust
Available in Menu
System
Available with
push-and-hold of “^”
button; eight levels L:0
through L:7
Available with push-and-hold
of “^” button; eight levels L:0
through L:7
Not Available
Compatible with
Digi-Wave Dock Available with adapter Yes Yes No
Microphone
Ground
Audio (right)
Audio (left)
Microphone/Headset Jack Difference
The jack on the Digi-Wave 400 series is different than older devices. The
wiring diagram in this section explains the internal wiring. See the pinout
diagram for details.
Differences Between Historical Digi-Wave DLTs
This chart covers feature differences only, not features common to all DLTs, based off the most common firmware
versions. The features available are shown in the chart below. If blank, the feature is not available.
Description DLT 400 DLT 300 DLT 100 2.0 DLT 100
Quick Group Change √ √ √
Voting Function √
Receive Only (1-way mode) √ √ √
Speaker Only (2-way mode) √ √ √
Clock or Group displayed on Main
Screen Optional Clock Optional Clock or Group Clock Clock
Talk Timer √
Auto Shut-off 5 minutes 5 minutes 5 minutes 2 minutes
Push-to-Talk & Push-and-Latch √
(Guest units only)
√
(Guest units only)
√
(Guest units only)
Mic Gain Default Level 33 33 33 36
Saving and Replacing Profiles
After settings have been configured, you will have the option to save your settings as a profile, or replace an
existing profile. This is only available if Advanced Settings have been adjusted.
If you choose to not save your profile, the device will still use the settings but they cannot be loaded again if the
settings are later changed.
Saving Profiles
After selecting your settings, you can select a numbered profile where you can save your settings. Five profiles
are available.
Profiles that are being used have a disc icon next to them. Profiles can be overwritten if desired.
Select the profile name to use to save the settings to the profile. If the profile is already in use, confirm that you
are replacing an existing profile.
Loading Profiles
For information on loading profiles, see “Load Profile” on page 11.
Differences between DLT 400, DLT 300, DLT 100 2.0 &
DLT 100
Function/
Description DLT 400 DLT 300 DLT 100 2.0 DLT 100
Lock Mode
Most settings
unavailable when lock
set. Lock icon next to
unavailable settings.
With settings locked,
can ONLY adjust
Power, Volume, Talk
With settings locked, can
ONLY adjust Power, Volume,
Talk
With settings locked,
can adjust Power,
Volume, Talk, Tone,
Mic level, and Group
Voting function Not Available Not Available Not Available Available
GRP button /
ABS button Not Available
Labelled “GRP”
1-way mode: not
functional
2-way mode: used to
enable easy group
change with push-
and-hold of this
button
Labelled “GRP”
1-way mode: not functional
2-way mode: used to enable
easy group change with push-
and-hold of this button
Labelled “ABS”
1-way mode: not
functional
2-way mode: On
Master, used to
enable voting; on
Master 2 or Guest,
used to “Abstain”
when voting
^button / yes
“ch+” button Labelled ^
Navigates menu system
Channel/Group up
Labelled ^
1-way mode: Channel
up
2-way mode: Group up
Labelled ^
1-way mode: Channel up
2-way mode: Group up
Labelled yes
1-way mode: Channel
up
2-way mode: Group
up
v button / no
ch-button
Labelled ^
Navigates menu system
Channel/Group down
Labelled v
1-way mode: Channel
down
2-way mode: Group
down
Labelled v
1-way mode: Channel down
2-way mode: Group down
Labelled “no”
1-way mode: Channel
down
2-way mode: Group
down
Listen only (1-
way mode) Not Available Available Available on F-8 firmware Not available on F-7 firmware Available
Speaker only (2-
way mode) Not Available Available Available on F-8 firmware Not available on F-7 firmware Available
Group Number /
Clock function
Can switch positions.
One may be displayed
in the center of the
screen, the other small
near the bottom.
Icon GROUP and
Group Number
Displayed in place of
Clock on Main Screen
Icon GROUP and Group
Number Displayed in place of
Clock on Main Screen
Clock Enabled on
Main Screen and
during Master 1 Setup

Digi-Wave 400 Series Digi-Wave 400 Series
2524
Description DLT 400 DLT 300 DLT 100 2.0 DLT 100
Mic Gain Max Level 53 53 53 63
Digi-Wave Dock compatible With Adapter √ √
Up to 2 Active Mics √not limited to 2 in tour
mode √ √
Up to 4 Active Mics √Tour Guide Mode
Up to 6 Active Mics √Intercom Mode
Updating DLT 400 and DLR 400 RCH Firmware
The Digi-Wave system should ship with the latest firmware; however, over time systems may need to be
updated.
A Downloader will need to be installed onto a computer in order to load the firmware onto the Digi-Wave
device. The Downloader is a separate software download from the Digi-Wave firmware itself.
The latest firmware and the Downloader can be found on the Williams AV website, linked to on the product’s
page.
To prepare the Downloader software:
1. Download the Downloader, and run the program.
2. If the USB drivers are not installed, click the Install dll and USB drv button.
3. The drivers will install, and a pop up message will let you know the installation is complete.
4. Once the drivers are installed, the button will no longer be active.
To update your DLT 400 and DLR 400 RCH device:
1. Download the firmware .bin file off of the Williams AV website to your computer.
2. Turn the device you are updating off.
3. Hold down the menu/select button.
4. While holding down the menu/select button, connect a USB-C cable to the device, similar to if you were
charging the device.
5. After a few seconds, Download Mode... should appear on the device’s screen.
6. Release the menu/select button.
7. Open the Downloader.
8. Select the COM port the device is connected to.
9. Press the Find File button and select the firmware file.
10. Click the Download button.
11. The device will be ready to use when the update is complete. A blue message will appear if the installation
was successful.
12. Once the firmware installation was successful, disconnect the USB cable.
13. Power on the device. The firmware version displayed when starting should be updated.
Note: If the DLR 400 ALK requires updates, please contact our TechBlue Technical Support team.
Troubleshooting
Problem Cause What to Do
Power does not turn-on Dead battery Charge the battery, replace battery
Power turned off
automatically Master device can’t be found Turn on Master unit
Power doesn’t turn off Program Error Press reset button on the back of device (DLT
only)
No audio or wrong audio in
headphones
Disconnection of headphone Check headphone connection
Master unit shut off Turn on / set Master
Different Group Number settings Set every unit to the same group number
Out of range Move to within the range of 100ft (outside) or
200 ft (inside) from the Master unit
More than 1 Master exists in a group Set one Master per group
Obstacle exists Move to another place or move the obstacles
More than 2 units with same address exist
in a group Set different address
Error in attendee checking More than 2 units with same address exist
in a group Set different address
Can’t select receiving channel Transmitting channel is overlapping Set different transmitting channel
Can’t select group/channel on
receiver Receiver is locked See “DLT Lock” on page 6
Unable to transmit
Interpretation
Check the mode for simultaneous
interpretation mode Set simultaneous interpretation mode
More than 2 Master units exist Set one Master only
DLT keeps turning off Master unit shut off Turn on / set Master
Can’t hear the speaker
Mic Sensitivity too low
Adjust the sensitivity for the microphone you
have. (Mic 044-2p is about 33, Mic 068 is about
17).
Master unit shut off
See why the Master shut off and correct the
problem. Turn on the Master and verify the
battery level.

Digi-Wave 400 Series Digi-Wave 400 Series
2726
Problem Cause What to Do
A DLT will not sync to Master 1
Out of Range Bring the unit closer to the Master
Master is Off Turn Master unit on
Master is adjusting settings On Master, exit settings.
No/Incorrect Secure Code Make the secure code the same as the Master
Wrong Group Number Make group numbers match the Master
Signal Strength is blinking The Guest has not found a Master to sync
to.
Program at least one unit as the Master or turn
on the existing Master. Verify that the Group
numbers match. Master must not be in settings
menu.
Buttons not functioning Super lock enabled Disable super lock
Time of Day Incorrect Time of Day on Master 1 is Incorrect.
(All units sync their time from Master 1) Set time of day to the correct time on Master 1.
Specifications - DLT 400 Transceiver
Dimensions 4.22”W x 2.60”H x 0.50”D
(107.3 mm x 66 mm x 12.6 mm)
Weight 3.3 oz (94 g) including battery
Color Black/Silver (Front/Back)
Case Material Black ABS plastic
Battery type Lithium Polymer with smart charge built into transceiver; 1800 mAH
Battery life Up to 16 hrs talk time per charge@ 1ch Tx and 1ch Rx
Power Save Auto Sleep Mode after 5 minutes of no RF signal from compatible devices
Charge time 5 hrs. approx.
System Voltage OLED 14VDC; RF 5VDC; Logic 3.3 VDC
Operating frequencies 2.4 GHz (ISM band); 2402 – 2476 MHz FHSS
Audio Frequency response
(-3dB Level)
Intercom Mode: 100 - 7,200 Hz
Other Modes: 100 - 11,500 Hz
SNR 73 dB (A-weighted, default Rx volume with mic input )
THD 0.1 % (Default Volume, 1kHz)
Microphone input Internal microphone (disabled when MIC jack engaged) and 3.5 mm phone jack
(sleeve) with electret microphone bias, adjustable gain with 63dB range.
Line Input USB-C, Adjustable level
Headphone Output 3.5 mm TRRS headphone jack; 25 mW, R 32 Ω
Audio Output Headphone: Max SSPL 90 111.8dB (EAR 013), 116.8dB (EAR 041)
Line: USB-C, Adjustable level
Range Up to 900 ft (274 m) (depending upon environmental conditions)
Modulation FSK
RF Output 19 dBm Typical
Security 87 bit encryption (300 Series Compatiable), 87+128 bit Encryption, Encrpytion PIN, Lock for
settings
Side tone -6 dB below volume, tone variation (Off, Low and High settings available)
Indicators OLED
LEDs Red LED around Talk button when enabled; Bi-color, changing green and red LED at top
Charging Connectors USB-C; Two contacts for use with CHG 412
Compatible Receiver DLR 400 RCH, DLR 400 ALK, DLT 300 with some limitations and DLR 360 with some
limitations
Operating Tempurature
Range
14ºto 113ºF (-10ºto 45ºC)
Approvals FCC, Industry Canada, CE, RoHS 3, WEEE, RCM, ANATEL, KC, Giteki
Warranty 2 years parts and labor (90 days on accessories); 6 months on internal battery
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

Digi-Wave 400 Series Digi-Wave 400 Series
2928
Specifications - DLR 400 RCH Receiver
Dimensions 4.22”W x 2.60”H x 0.50”D
(107.3 mm x 66 mm x 12.6 mm)
Weight 3.3 oz (94 g) including battery
Color Black
Battery type Lithium Polymer with smart charge built into transceiver; 1800 mAH
Battery life Up to 32 hrs per charge @ 1ch Rx
Power Save Auto Sleep Mode after 5 minutes of no RF signal from compatible devices
Charge time 5 hrs. approx.
System Voltage OLED 14VDC; RF 5VDC; Logic 3.3 VDC
Operating frequencies 2.4 GHz (ISM band); 2402 – 2476 MHz FHSS
Audio Frequency response
(-3dB Level)
Intercom Mode: 100 - 7,200 Hz
Other Modes: 100 - 11,500 Hz
SNR 73 dB (A-weighted)
THD 0.1 % (Default Volume, 1kHz)
Headphone Output 3.5 mm TRRS headphone jack; 25 mW, R32 Ω
Line Audio Output USB-C, Adjustable level
Range Up to 900 ft (274 m) (depending upon environmental conditions)
Modulation FSK
RF Sensitivity -92 dBm
Security 87 bit encryption (300 Series Compatiable), 87+128 bit Encryption, Encrpytion PIN, Lock for
settings
Indicators OLED
LEDs Bi-color, changing green and red LED at top
Charging Connectors USB-C; Two contacts for use with CHG 412
Compatible Units DLT 400, DLT 300 with some limitations
Operating Tempurature
Range
14ºto 113ºF (-10ºto 45ºC)
Approvals FCC, Industry Canada, CE, RoHS 3, WEEE, RCM, ANATEL, KC, Giteki
Warranty 2 years parts and labor (90 days on accessories); 6 months on internal battery
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.
Specifications - DLR 400 ALK Receiver
Dimensions: 2.36” W x 3.54” H x 0.63” D
(60 mm x 90 mm x 16 mm)
Weight: 1.7 oz. (47 g) without batteries.
Frequency Band: 2.4 GHz (ISM band)
Modulation: FSK
Case Material: Black ABS Plastic
Battery Type: 2 x AAA Alkaline Batteries
Battery Life: Alkaline Disposable (BAT 010-2): Up to 30 hrs
Power Save: Auto Sleep Mode after 5 minutes of no RF signal from compatible devices
Audio Frequency Response:
(-3dB level)
Intercom Mode: 100 – 7,300 Hz
Interpretation and other modes: 100-11,200 Hz
SNR: 74 dB (A-weighted)
THD: 0.1% (typical)
Antenna: Internal
Range: Up to 900 ft (274 m) (depending upon environmental conditions)
Headphone Audio Output: 3.5 mm TRRS jack with mono output for headphones, earphones, or neckloop
27 mW maximum @32Ω
Display: LCD shows status: Battery Level, RSSI, Group/Channel #
Temp. Range: 14° – 113°F (-10° to 45°C)
Compatible Units DLT 400, DLT 300
Approvals: FCC, Industry Canada, RoHS 3, CE, WEEE, RCM, ANATEL, KC, Giteki
Warranty: 2 years parts and labor (90 days on accessories)
NOTE: SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.
Regulatory Statements
FCC
FCC ID: CNMDLT400
FCC Compliance Statement
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential
installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.
Caution: Any changes or modifications to the equipment not expressly approved by the party responsible for
compliance could void your authority to operate the equipment.
SAR Requirement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.

This product meets the applicable national or international RF exposure guidance (SAR guideline) when used
normally against your head or, when worn or carried, at a distance of 0.5 cm from the body. The SAR guideline
includes a considerable safety margin designed to assure the safety of all persons, regardless of age and health.
ISED
IC ID: 1360A-DLT400
Innovation, Science and Economic Development Canada Statement
This equipment complies with IC RSS-102 radiation exposure limits set forth for an uncontrolled environment.
Operation is subject to the following two conditions:
1. this device may not cause harmful interference, and
2. this device must accept any interference received, including interference that may cause undesired operation
Cet équipement est conforme aux limites d’exposition de rayonnement d’IC RSS-102 déterminées pour un
environnement non contrôlé. Cet
Son utilisation est soumise aux deux conditions suivantes:
1. Cet appareil ne doit pas causer d’interférences et
2. il doit accepter toutes interférences reçues, y compris celles susceptibles d’avoir des effets indésirables sur son
fonctionnement.
SAR Requirement
This product meets the applicable national or international RF exposure guidance (SAR guideline) when used
normally against your head or, when worn or carried, at a distance of 0.5 cm from the body. The SAR guideline
includes a considerable safety margin designed to assure the safety of all persons, regardless of age and health.
Ce produit est conforme aux directives nationales ou internationales sur l’exposition aux fréquences
radioélectriques (directives SAR) en vigueur lorsqu’il est utilisé normalement contre la tête ou, porté ou porté, à
une distance de 0,5 cm du corps.
La directive SAR inclut une marge de sécurité considérable conçue pour assurer la sécurité de toutes les
personnes, indépendamment de leur âge et de leur santé.
European Union
Hereby, Williams AV declares that the transciever is in compliance with Directive 2014/53/EU and other Union
harmonization as applicable. The full text of the EU declaration of conformity is available by contacting Williams
AV at the following email address: [e-mail]
Japanese Statements
この装置は、クラスＡ機器です。この装置を住宅環境で使用すると電波妨害を引き起こすことがありま
す。この場合には使用者が適切な対策を講ずるよう要求されることがあります。 VCCI-A
This is a Class A equipment. Operation of this equipment in a residential environment could
cause radio interference. In such a case, the user may be required to take corrective actions.
VCCI-A
R
210-133739
Korean Identification Numbers
R-C-WSa-DLT400
R-R-WSa-DLR400RCH
Brazilian Statements
These units have been tested and certified by an independent party, Anatel, in Brazil.
08891-19-09817
ANATEL: 08891-19-09817
Este equipamento não tem direito à proteção contra interfe-
rência prejudicial e não pode causar interferência em siste-
mas devidamente autorizados.

WilliamsAV.com
U.S. | 800.843.3544 [e-mail] INTL | +1.952.943.2252 [e-mail]
© 2022, Williams AV, LLC
MAN 241I-1122
2-Year Warranty
Williams AV products are engineered, designed, and manufactured under carefully controlled conditions to
provide you with many years of reliable service.
Williams AV warrants the Digi-Wave system against defects in materials and workmanship under normal use
and conditions for 2-years from the product’s date of purchase.
This warranty is available to the original end purchaser of the product and CAN BE transferred to subsequent
purchasers of the product.
Microphones, earphones, headphones, batteries, chargers, cables, carry cases, and most other accessory
products carry a 90-day warranty.
Williams AV has no control over the conditions under which this product is used. Williams AV, therefore,
disclaims all warranties not set forth above, both express and implied, with respect to the Digi-Wave System,
including but not limited to, any implied warranty of merchantability or fitness of use of such equipment
including, without limitation, any warranty that the use of such equipment for any purpose will comply with
applicable laws and regulations. Williams AV shall not be liable to any person or entity for any medical expenses
or any direct, incidental or consequential damages caused by any use, defect, failure or malfunctioning of the
product, whether a claim for such damages is based upon warranty, contract, tort or otherwise.
The sole remedy for any defect, failure or malfunction of the products is replacement of the product. No person
has any authority to bind Williams AV to any representation or warranty with respect to the Digi-Wave System.
Unauthorized repairs or modifications will void the warranty. This warranty is void if damage occurred because
of misuse, or if the product has been repaired or modified by anyone other than a factory authorized service
technician. Warranty does not cover normal wear and tear on the product or any other physical damage unless
the damage was the result of a manufacturing defect. Williams AV is not liable for consequential damages due
to any failure of equipment to perform as intended. Williams AV shall bear no responsibility or obligation with
respect to the manner of use of any equipment sold by it.
This warranty does not cover reimbursement for your costs of removing and transporting the product for
warranty service evaluation or installation of any replacement product provided under this warranty.
The exclusions and limitations set out above are not intended to, and should not be construed so as to
contravene mandatory provisions of applicable law. If any part or term of this Disclaimer of Warranty is held to
be illegal, unenforceable, or in conflict with applicable law by a court of competent jurisdiction, the validity of
the remaining portions of this Disclaimer of Warranty shall not be affected, and all rights and obligations shall
be construed and enforced as if this warranty did not contain the particular part or term held to be invalid. The
terms of the warranty are governed by the laws of the State of Minnesota.
Prices and the specifications of the products are subject to change without notice.
For Complete Warranty Statement go to: www.williamsav.com/warranty-statement
NOTICE: Williams AV products are NOT designed for use in extreme temperature, humidity or chemical
environments. The introduction of chemicals such as chlorine, salt water or human sweat into the product will
cause damage to the circuitry. Damage due to these causes is NOT covered under the Product Warranty.
If you experience difficulty with your system, call Toll-Free for Customer Assistance
1-800-843-3544 (U.S.A.) or [phone] (Outside the U.S.A.)
If it is necessary to return the system for service, your Customer Service Representative will give you a Return
Authorization Number (RA) and shipping instructions.
Pack the system carefully and send it to:
Williams AV
Attn: Repair Dept.
10300 Valley View Road
Eden Prairie, MN 55344
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