Lectrosonics DSR4 User manual

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This guide is intended to assist
with initial setup and operation of
your Lectrosonics product.
For a detailed user manual,
download the most current
version at: www.lectrosonics.com
DSR4
Four Channel Digital Slot Receiver
DSR4-A1B1, DSR4-B1C1, DSR4-941, DSR4-961
30 August 2023
scan for our DSR4
Deep Dive product videos

LECTROSONICS, INC.2
IMPORTANT WARNING
The DSR4 is a high current receiver that should not be
used in a slot-mount camera without double checking
available current from the camera.Many, if not most,
slot mount cameras are designed for lower current
receivers and are current limited/fuse protected.The
DSR4 draws up to 700mA at 7VDC. DO NOT drop it in
the camera to “see what happens.” Consult with your
camera manufacturer FIRST before attempting to use
this receiver in-slot. 
The DSR4 is intended for use in slot devices which can
supply enough current safely and without damage to
fuses or poly-fused circuits.
Lectrosonics will not be responsible for damages
that may result from using this receiver in a slot
mount that cannot supply adequate current.

www.lectrosonics.com 3
Technical Description
The DSR4 digital 4-channel receiver is a versatile slot receiver, equally
appropriate for bag use, as well as reality TV and run and gun applica-
tions. Extremely high Third Order Intercept (IP3) performance of +15
dBm, 24-bit/48 kHz audio performance, and AES-256 CTR mode en-
cryption ensure that professionals in all audio disciplines have the tools
needed to get the job done, even in extremely tough environments.
Compatibility Modes
The DSR4 receiver was designed to operate with Lectrosonics digi-
tal transmitters from the D2, DCH and M2 series. The receiver is also
backward compatible with Digital Hybrid Wireless® transmitters in-
cluding those with NA Hybrid, NU Hybrid, JA HYBRID and EU Hybrid
modes.
Encryption
The DSR4 receiver features AES 256-bit, CTR mode encryption, with 4
dierent key policies available.
Diversity Options
The DSR4 oers two diversity options: for 4-channel operation, each
channel combines signals from both antennas in or out of phase,
depending on eld strength at each antenna and which combination
yields the best results. For 2-channel operation, receivers can be paired
for Vector Diversity operation. The Vector subsystem smoothly and
continuously combines RF signals from both channels, with diering
phase angles in order to obtain maximum energy. The four receivers in
the DSR4 can be use separately or combined in pairs.
RF Frequency Tracking Front-End
In addition to the extremely high IP3 capability of the receiver, to sig-
nicantly reduce unwanted interference and intermodulation problems,
the DSR4 has a frequency selective front-end section that tracks and
tunes to the desired signal frequency and rejects unwanted interfering
signals. The low noise, high current RF amplier was designed with
feedback regulation for stability and precise gain in order to handle
stronger RF signals without output overload. This produces a robust
front-end that is as selective as xed single frequency designs and is
suitable for use in close proximity to other receivers and transmitters
commonly used in eld production bag systems.
Smart Noise Reduction (SmartNR™)
The DSR4 has been meticulously designed using the best available low
noise components and techniques. Nonetheless, the wide dynamic
range of digital and Hybrid transmission technology, combined with at

LECTROSONICS, INC.4
response to 20 kHz, makes it possible to hear the -120 dBV noise oor
in the transmitter’s mic preamp, or the (usually) greater noise from the
lav microphone itself. In order to reduce this noise and thus increase
the eective dynamic range of the system, the DSR4 is equipped with
a selectable Smart Noise Reduction algorithm, which removes hiss
without sacricing high frequency response.
The Smart Noise Reduction algorithm has three modes - OFF/NOR-
MAL/FULL - selectable from a user setup screen. When switched
OFF (the default setting for digital compat modes) no noise reduc-
tion is performed and complete transparency is preserved. All signals
presented to the transmitter’s front end, including any faint microphone
hiss, will be faithfully reproduced at the receiver. When switched to
NORMAL, (the factory default setting for Hybrid modes) enough noise
reduction is applied to remove most of the hiss from the mic preamp
and some of the hiss from lavaliere microphones. The noise reduc-
tion benet is dramatic in this position, yet the degree of transparency
maintained is exceptional. When switched to FULL, enough noise
reduction is applied to remove most of the hiss from nearly any signal
source of reasonable quality, assuming levels are set properly at the
transmitter. This additional noise reduction comes at the cost of some
transparency for low-level room noise, yet the algorithm remains unde-
tectable under most circumstances.
Audio Output Level
A setup screen is provided for adjusting the audio output level in 1 dB
increments from -50 to +7 dBu using the front panel MENU/SEL, UP,
and DOWN buttons.
Test Tone
To assist in matching the audio levels of equipment connected to the
DSR4, a 1 kHz audio test tone, adjustable from -50 to +7 dBu in 1 dB
increments, is available at the outputs. If using AES3 outputs, the level
is xed and cannot be adjusted.
Power Supply
The DSR4 is operated from an external DC power source (DCR15/4AU
recommended).The receiver has a built-in Poly-Fuse for protection. This
fuse automatically resets if the power supply is disconnected for about
15 sec. The power section also has protection circuits that prevent dam-
age to the receiver if a positive ground power source is applied.
Power O
When the Front Panel Power/Back button is pressed for several sec-
onds, the audio output is instantly muted (squelched) and the message
“POWERING OFF...” is displayed briey before the receiver switches
o.

www.lectrosonics.com 5
DSR4 Front Panel Controls
MENU/SEL Button
The MENU button accesses the available menus and selects the de-
sired setting.
PWR/BACK Button
The PWR/BACK button is used to turn the receiver on and o. When
browsing menus and making changes to settings, press PWR/BACK to
return to previous menu.
Up/Down Arrow Buttons
The UP/DOWN buttons are used to scroll or input the various options
within each menu selection.
Antenna Port (2)
TA5M Connector
Routes analog audio Channels 3 and 4 or AES3 audio channels 1-4 to
the top of the unit.
IR (infrared) Port
(just under the front panel)
Settings can be transferred between transmitter and receiver or receiv-
er and receiver.
USB Port
(just under the front panel)
The microB USB port can be used to connect the DSR4 to the Lectro-
sonics Wireless Designer software and to perform rmware updates.

LECTROSONICS, INC.6
Main Window Display
The Main Window displays infor-
mation concerning the RF levels at
each antenna per channel, audio
modulation levels, the condition
of the Pilot Tone (Hybrid) or Link
(digital), and power conditions for
both the receiver and the associ-
ated transmitters. It is also the
access portal to menu selections
for setting up the receiver and
searching for clear frequency chan-
nels. The PWR/BACK button will
cycle between the Home screen,
showing all four channels and the
channel detail screens. Use the UP
and DOWN arrows to go between
individual channels in the Channel Detail view.
• Antenna Icons: Status of the diversity system.
• RF Signal Strength Strip Charts: RF signal strength indicators.
• Channel Status Indicator: Pilot tone, link and encryption system
status.
Navigating the Menus
From the Main Window, press MENU/SEL to enter the menu, then
navigate with the UP and DOWN arrows to highlight the desired setup
item. Press MENU/SEL to enter the setup screen for that item. Refer to
the Menu Map on the following pages.
IR Reector Purpose & Installation
Some users, especally those who plan to use the DSR4 in a rack or
closely-packed bag, may nd syncing dicult due to the close spacing
near the IR window. For these users, we include an IR Reector (P/N
27372) and Adhesive Strip (P/N 27373). Once in place, this reector
allows IR sync to happen from the front of the control panel.
Materials Needed:
IR Reector and adhesive strip
 Tweezers /needle nose pliers
 Alcohol pad or alcohol and a cotton swab

www.lectrosonics.com 7
Instructions:
1) Holding the reector with tweezers
(or pliers), swab the reector with the
alcohol pad or alcohol on a cotton
swab. Lay reector with the at side, as
shown. The at side is where adhesive
will be placed. The oil from your ngers will hamper adhesion, which is
why it is important not to touch the reector.
2) Swab the area just below and directly on either side of the IR win-
dow on the DSR with the alcohol pad. This is where the reector will be
placed.
3) Carefully remove the paper
backing from the adhesive strip.
Using your tweezers/pliers, place it
sticky side up on a at surface. Pick
up the reector and lay it on top of
the adhesive strip. Press the center
and end tabs into the adhesive with
your tweezers.
4) Slowly and carefully remove the reector from
the adhesive strip using your tweezers. It will
leave the adhesive from the strip behind. Do not
be concerned with the “coverage,” as the reec
tor only needs enough adhesive to stick to the
DSR4.
5) Lay the DSR4 on a at surface with adhesive facing up, and, using
your tweezers, align the bottom edge of the reector with the bottom of
the “IR PORT” engraving. Press rmly with ngers to adhere the reec-
tor to the DSR4. The bond is strong but can be removed if needed. You
will need another adhesive strip to re-adhere (see Accessory pages for
re-order information).

LECTROSONICS, INC.8
DSR4 LCD Menu Map
The menus presented on the LCD are ar-
ranged in a straightforward manner, with
those that are likely to be used more often
located at the top of the tree.
You’ll notice that the menu headers are now
in color, with symbols indicative of the menu
section.
Main Menu Tree
Frequency
to pause scan
Select Freq or Grp with arrow buttons
to toggle.
Frequency 1
607.900
Grp u
Scan to select
channel. to zoom view.
When zoomed, press MENU/SEL +
UP or DOWN for fine tuning
Scanning... 1
607.000
Clear Scan
Data
Scan
data
CLEARED
Pilot Bypass
Select option with arrow buttons
to select.
Pilot Bypass
OFF
ON
* Pilot Tone Bypass
is only available in
Hybrid Compat
Modes
PWR
BACK
Select option with arrow buttons
to select.
Talkback Talkback 1
ON
PWR
BACK
Select option with arrow buttons
to toggle.
Select option with arrow buttons
to toggle.
After scan clears it automatically
reverts to back the main menu tree.
Select Rx1-4 with arrow buttons
to toggle
between Rx
and mode options .
Compat
Mode
CompatMode 1
D2
Select option with arrow buttons
to select.
Audio
Setup
Select option with arrow buttons
to select.
Output Type
Output Type
AES3 ANLG
Select option with arrow buttons
to toggle.
Polarity
PWR
BACK
Select option with arrow buttons.
Values are Off, Norm and Full.
to select.
Smart NR PWR
BACK
to get key.
to send key.
IR &
Keys
Select option with arrow buttons
to select.
Send Freq
Send All
Get Freq
Get All
IR
SYNC
OK
IR
SYNC
OK
IR
SYNC
OK
IR
SYNC
OK
RF Setup
Group Edit Group Edit u
(empty)
MENU + å to ADD
MENU + ãto DEL
Use arrows
to toggle
and add freq
range and
groups. Use
Down Arrow
to save.
Group Edit u
(empty)
Vector Pairs
Vector Pairs
1&2: Paired
3&4: Not Paired
TxInfo Rx 1
Block: A1B1
Step: 25
TxInfo
Test Tone Test Tone
Level: -48dB
Freq: 1000 Hz
Select option with arrow buttons
to select.
Lock/Unlock
RX On/Off
Backlight
Backlight
Auto On Auto On?
Always on
30 Seconds
5 Seconds
Select option with arrow buttons
to select.
Enabled
Disabled
Select option with arrow buttons
to select.
TXBat Icon
Select option with arrow buttons
to select.
Select option with arrow buttons
to select.
TXBat Timer
TX Bat Timer Select option with arrow buttons
to toggle.
Time: 1:33
No Alert
Settings
TXBat Type
Select option with arrow buttons
to select.
Locked
Unlocked
Select option with arrow buttons
to select.
Lock/Unlock
MENU+å to reset
PWR
BACK
PWR
BACK
PWR
BACK
PWR
BACK
PWR
BACK
Locale Locale
About
About DSR4
Select option with arrow buttons
to select.
Band A1B1
V1.05
/1.01
Default Restore
defaults?
No
Yes
Select option with arrow buttons
to toggle.
NA
EU
AU
to go back.
PWR
BACK
Audio Level
Audio Level
1 3
2 4
+7 +00
+7 +00
1&2 3&4
Smart NR
1 3
2 4
ON OFF
OFF OFF
Polarity
1 3
2 4
POS POS
POS POS
Sync --->
Send Freq Rx1
Sync --->
Send All Rx1
Sync --->
Get Freq Rx1
Sync --->
Get All Rx1
to get key.
Group Sync
IR
SYNC
OK
to get key.
Key Type
IR
SYNC
OK
Send
Group Sync
u
Group
Universal
Key Type
RX On/Off
1 3
2 4
ON OFF
OFF OFF
TXBat Type
1 3
2 4
LB50 AAalk
9VLth LB-50
Rx1
TXBat Icon
1 TI 3
2 4
VOLT TIME
BAR BAR
Smart Tune
Smart Tune
Rx 1
Rx 2
RX 3
to select. Tx1 Range?
A1B1
A1
Use arrow buttons to toggle
through range options
to
select.
Searching...
470.600
Tuned Rx 1
525.100
Sync!
Selects an open frequency.
Choose Down Arrow to Sync.
to repeat and tune RX 2
Select option with arrow buttons

www.lectrosonics.com 9
Main Menu Tree
Frequency
to pause scan
Select Freq or Grp with arrow buttons
to toggle.
Frequency 1
607.900
Grp u
Scan to select
channel. to zoom view.
When zoomed, press MENU/SEL +
UP or DOWN for fine tuning
Scanning... 1
607.000
Clear Scan
Data
Scan
data
CLEARED
Pilot Bypass
Select option with arrow buttons
to select.
Pilot Bypass
OFF
ON
* Pilot Tone Bypass
is only available in
Hybrid Compat
Modes
PWR
BACK
Select option with arrow buttons
to select.
Talkback Talkback 1
ON
PWR
BACK
Select option with arrow buttons
to toggle.
Select option with arrow buttons
to toggle.
After scan clears it automatically
reverts to back the main menu tree.
Select Rx1-4 with arrow buttons
to toggle
between Rx
and mode options .
Compat
Mode
CompatMode 1
D2
Select option with arrow buttons
to select.
Audio
Setup
Select option with arrow buttons
to select.
Output Type
Output Type
AES3 ANLG
Select option with arrow buttons
to toggle.
Polarity
PWR
BACK
Select option with arrow buttons.
Values are Off, Norm and Full.
to select.
Smart NR PWR
BACK
to get key.
to send key.
IR &
Keys
Select option with arrow buttons
to select.
Send Freq
Send All
Get Freq
Get All
IR
SYNC
OK
IR
SYNC
OK
IR
SYNC
OK
IR
SYNC
OK
RF Setup
Group Edit Group Edit u
(empty)
MENU + å to ADD
MENU + ãto DEL
Use arrows
to toggle
and add freq
range and
groups. Use
Down Arrow
to save.
Group Edit u
(empty)
Vector Pairs
Vector Pairs
1&2: Paired
3&4: Not Paired
TxInfo Rx 1
Block: A1B1
Step: 25
TxInfo
Test Tone Test Tone
Level: -48dB
Freq: 1000 Hz
Select option with arrow buttons
to select.
Lock/Unlock
RX On/Off
Backlight
Backlight
Auto On Auto On?
Always on
30 Seconds
5 Seconds
Select option with arrow buttons
to select.
Enabled
Disabled
Select option with arrow buttons
to select.
TXBat Icon
Select option with arrow buttons
to select.
Select option with arrow buttons
to select.
TXBat Timer
TX Bat Timer Select option with arrow buttons
to toggle.
Time: 1:33
No Alert
Settings
TXBat Type
Select option with arrow buttons
to select.
Locked
Unlocked
Select option with arrow buttons
to select.
Lock/Unlock
MENU+å to reset
PWR
BACK
PWR
BACK
PWR
BACK
PWR
BACK
PWR
BACK
Locale Locale
About
About DSR4
Select option with arrow buttons
to select.
Band A1B1
V1.05
/1.01
Default Restore
defaults?
No
Yes
Select option with arrow buttons
to toggle.
NA
EU
AU
to go back.
PWR
BACK
Audio Level
Audio Level
1 3
2 4
+7 +00
+7 +00
1&2 3&4
Smart NR
1 3
2 4
ON OFF
OFF OFF
Polarity
1 3
2 4
POS POS
POS POS
Sync --->
Send Freq Rx1
Sync --->
Send All Rx1
Sync --->
Get Freq Rx1
Sync --->
Get All Rx1
to get key.
Group Sync
IR
SYNC
OK
to get key.
Key Type
IR
SYNC
OK
Send
Group Sync
u
Group
Universal
Key Type
RX On/Off
1 3
2 4
ON OFF
OFF OFF
TXBat Type
1 3
2 4
LB50 AAalk
9VLth LB-50
Rx1
TXBat Icon
1 TI 3
2 4
VOLT TIME
BAR BAR
Smart Tune
Smart Tune
Rx 1
Rx 2
RX 3
to select. Tx1 Range?
A1B1
A1
Use arrow buttons to toggle
through range options
to
select.
Searching...
470.600
Tuned Rx 1
525.100
Sync!
Selects an open frequency.
Choose Down Arrow to Sync.
to repeat and tune RX 2
Select option with arrow buttons

LECTROSONICS, INC.10
AMJ19
Swivelling Whip Antenna with
Standard SMA Connector, Block
19. Ships with A1B1 units only.
AMJ22
Swivelling Whip Antenna with
Standard SMA Connector, Block
22. Ships with A1B1 and B1C1
units.
AMJ25
Antenna with swiveling SMA con-
nector. Shipped with B1C1 units
only.
AMJ944
Antenna with swiveling SMA con-
nector. Shipped with 941 units
only.
AMJ961
Antenna with swiveling SMA con-
nector. Shipped with 961 units
only.
Supplied Parts
and Accessories
Optional Parts
and Accessories
21770
Male SMA to Female BNC Adapt-
er.
21926
MicroB USB cable for rmware
updates.
27372
IR Reector. To be used with
27373.
27373
Adhesive strip to be used with IR
Reector.
28979
Replacement screws (4) for 36016
DSR4 mounting bezel kit.
ACOAXTX
Antenna, Coaxial, SMA Plug;
Specify Block.
DCR15/4AU
Power Supply, 4ADC 100-240V In,
15VDC Regulated Output.
DSR4BATTSLEDBOTTOM
A “battery sled” that positions the
battery on the bottom of the re-
ceiver for mounting on the bottom
of the camera with the LCD and
rear panel nomenclature oriented
correctly. Two TA5 audio connec-
tors and one DC coaxial connec-
tor.
DSR4BATTSLEDTOP
A “battery sled” that positions the
battery on top of the receiver for
mounting on the top of the cam-
era with the LCD and rear panel
nomenclature oriented correctly.
Two TA5 audio connectors and
one DC coaxial connector.
DSR4DB25
DSR4 Superslot adapter
connector plate for Sound
Devices SL-2. This includes the
adapter plate only with the two
mounting screws plus one extra
screw.

www.lectrosonics.com 11
MCTA5TA3F2
Audio cable for portable digital
receivers, TA5F to two TA3F con-
nectors, 18” cable. For two analog
balanced receiver outputs, or
two AES digital pairs (four audio
channels), into mixer or recorder
inputs.
MCTA5TPT2
Audio cable for portable digital
receivers, TA5F to two stripped
and tinned wires, 18” cable. For
two analog balanced receiver out-
puts, or two AES digital pairs (four
audio channels).
MCSR/5PXLR2
Audio cable for SR-type receivers,
rotatable right-angle TA5 to two
3-pin male XLRs. 20” cable.
PS200A
Power Cable, 15 in., Hirose4 to
LZR
PS2200A
Power Cable, 15 in., Hirose4 to
Dual LZR
SNA600A Omni Dipole Antenna
Versatile Antenna, 100 MHz Band-
width tunable from 550 to 800
MHz. Includes mounting screws
and bracket. Requires SMA to
BNC Adapter.
DSR4EXT
Adapter kit for DSR4 re-
ceiver, two TA5 audio output
jacks, locking power con-
nector, includes 6’ power
cord. Has spare mounting
screws in dummy holes in
adapter.
DSR4EXTUSB Adapter
This kit includes an output
and power panel with two
TA5 male balanced output
pairs, and a locking Hirose-4
DC power jack. A USB-C
jack allows for connection
of the DSR4 to Wireless
Designer for monitoring,
channel setup, scanning,
and frequency coordination.
Firmware updates must be
done with the USB Micro B
connector on the top panel
of the unit. Power cord not
incl.; order PS200A or use
equivalent.
DSR4OCTOSPACER
DSR4 mounting bezel kit
with 4 screws for Octopack
and Quadpack, no
connector included.
WARNING: Do not use Hirose 4
DC connector on the Octopack
when mounting DSR4 receivers.
DSR4SUPER
DB-25 bottom plate adapter
for DSR4 receivers used in
SuperSlot docks. This in-
cludes: The end plate adapt-
er, blue bezel (PN 27315-1),
gasket and hardware set.

LIMITED ONE YEAR WARRANTY
The equipment is warranted for one year from date of purchase against defects in
materials or workmanship provided it was purchased from an authorized dealer. This
warranty does not cover equipment which has been abused or damaged by careless
handling or shipping. This warranty does not apply to used or demonstrator equipment.
Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any
defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot
correct the defect in your equipment, it will be replaced at no charge with a similar new
item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.
This warranty applies only to items returned to Lectrosonics, Inc. or an authorized
dealer, shipping costs prepaid, within one year from the date of purchase.
This Limited Warranty is governed by the laws of the State of New Mexico. It states the
entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any
breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR
ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT
SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,
OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF
LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE
EQUIPMENT.
This warranty gives you specific legal rights. You may have additional legal rights which
vary from state to state.