A SYSTEMS DMP801 User manual

User’s Manual
Manual del Usuario
Automatic Mixer
DMP801
AUTOMATIC MIXER

2
DMP801
English
IMPORTANT SAFETY INSTRUCTIONS�������������������������������������������������������������������������������������� 3
INTRODUCTION�������������������������������������������������������������������������������������������������������������������������� 4
FEATURES����������������������������������������������������������������������������������������������������������������������������������� 4
GETTING STARTED �������������������������������������������������������������������������������������������������������������������� 4
GLOSSARY���������������������������������������������������������������������������������������������������������������������������������� 4
CONTROLS & SETTINGS ����������������������������������������������������������������������������������������������������������� 5
DMP801 SOFTWARE ������������������������������������������������������������������������������������������������������������������ 7
SIGNAL PROCESSING ������������������������������������������������������������������������������������������������������������� 18
TROUBLESHOOTING ��������������������������������������������������������������������������������������������������������������� 19
SPECIFICATIONS���������������������������������������������������������������������������������������������������������������������� 20
PARAMETERS ��������������������������������������������������������������������������������������������������������������������������� 21
Asystems reserves the right to alter any information contained within this
manual without prior notice�
V1�0 11/7/2014
CONTENTS

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DMP801
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RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
1. Read these instructions – All the safety and
operating instructions should be read before this
product is operated.
2. Keep these instructions – The safety and
operating instructions should be retained for
future reference.
3. Heed all warnings – All warnings on the appliance
and in the operating instructions should be
adhered to.
4. Follow all instructions – All operating and use
instructions should be followed.
5. Do not use this apparatus near water – The
appliance should not be used near water or
moisture – for example, in a wet basement or
near a swimming pool, and the like.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in
accordance with the manufacture’s instructions.
8. Do not install near any heat sources such
as radiators, heat registers, stoves, or other
heat.
9. Do not defeat the safety purpose of the polarized
or grounding plug. A polarized plug has two
blades with one wider than the other. A grounding
plug has two blades and a third grounding prong.
The wide blade or the third prong is provided for
your outlet, consult an electrician for replacement
of the obsolete outlet.
10. Protect the power cord from being walked on or
pinched particularly at the plugs, convenience
receptacles, and at the point where they exit from
the apparatus.
11.
the manufacturer.
12. Use only with the cart, stand, tripod,
manufacturer, or sold with the
apparatus. When a cart or rack is
used, use caution when moving the
cart/apparatus combination to avoid
injury from tip-over.
13. Unplug the apparatus during lightning storms or
when unused for long periods of time.
14.
Servicing is required when the apparatus has
been damaged in any way, such as power supply
cord or plug is damaged, liquid has been spilled
or objects have fallen into the apparatus has been
exposed to rain or moisture, does not operate
normally, or has been dropped.
15. CAUTION: These servicing instructions are
reduce the risk of electric shock, do not perform
any servicing other than that contained in the
do so.
16.
building-in space such as a book case or similar
unit, and remain a well ventilation conditions at
open site. The ventilation should not be impeded
by covering the ventilation openings with items
such as newspaper, table-cloths, curtains, etc.
17. WARNING: The mains plug/appliance coupler is
used as disconnect device, the disconnect device
shall remain readily operable.
18. This apparatus is for professional use only.
19. WARNING:
shock, do not expose this apparatus to rain or
moisture. The apparatus shall not be exposed to
liquids, such as vases, shall not be placed on
apparatus.
20.
an equilateral triangle is intended to alert
the user to the presence of non-insulated
“dangerous voltage” within the product’s
magnitude to constitute a risk of electric
shock.
Warning: To reduce the risk of electric shock, do
not remove cover (or back) as there are no user-
personnel.
The exclamation point within an equilateral
triangle is intended to alert the user to
the presence of important operating and
maintenance instructions in the literature
accompanying the appliance.
21. Protective earthing terminals. The
apparatus should be connected to a
mains socket outlet with a protective
earthing connection.
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
ATTENTION
AVERTISSEMENT: POUR REDUIRE LE RISQUE DE CHOC
ELECTRIQUE, NE RETIREZ P AS LE COUVERCLE (OU L'ARRIERE),
PAS DE PIECE RE PARABLE PAR L'UTILIS ATEUR A L'INTERIEUR
CONFIEZ LES RE PARATIONS A UN PERSONNEL QUALIFIE .
IMPORTANT SAFETY INSTRUCTIONS

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DMP801
English
INTRODUCTION
Congratulations on your purchase of a DMP801Automatic
Mixer� The DMP801 provides a simple, effective way to
maintain your audio levels in live venues without having
to keep on your toes� A single DMP 801 offers eight-in,
one-out support and the entire unit can be controlled
remotely through standard potentiometers and remote
controls� Internal processing is accomplished through a
high quality 40-bit oating point processor, with internal
signal processors and matrix routing all handled with
ease�
Clear, easy-to-use software on your Windows computer
makes control of your onboard processing simple� The
software offers full performance monitoring for each
processor, giving real-time information on the load
placed upon DSPs�
We know how eager you are to get started – hooking
up your new DMP801 is probably your rst priority
right now – but we would advise that you take the time
to look over this manual. Inside you’ll nd important
safety considerations and operating instructions that
could prove helpful� After reading the manual, we would
suggest putting it somewhere easy to nd as you will
probably need to refer to it later on�
FEATURES
√ 8 input channels available via 3-pin euroblock
connections
√ 40-bit floating point processor with internal
sampling selectable between 44�1 and 48 kHz
√ Ethernet connectivity for network control
application
√ Automatic DHCP network IP configuration
√ RS232 connection for remote operation
√ Easy and intuitive control software from Asystems
√ User-accounts with multi-layer security
√ 4-band parametric EQs and 31-band graphic
equalizers
√ Autoleveler (Loudness Control)
√ Compressors and noise gates
√ Level ducking with trigger control
√ All signal processors flexible and user-controllable
GETTING STARTED
For easy control of the DMP801, you will need to connect
the device to a network-enabled Windows computer� By
installing the Asystems software on a computer will allow
for remote control of this unit� Enter the DMP801’s IP
address into the PC software to locate the DMP801 on
either the local area network�
Connect all necessary input and output devices� Input
can be achieved through correctly wired euroblock
connectors� Wiring for balanced euroblock connectors
should be as follows:
Pin 1: Shield/Ground
Pin 2: Cold (–)
Pin 3: Hot (+)
Whereas unbalanced connectors can be wired as so:
Pin 1: Shield/Ground
Pin 2: Link to Pin 1
Pin 3: Hot (+)
The 8 insert points for each of the channels accept ¼”
TRS phone jacks� These connectors are wired as follows:
Tip: Send
Ring: Receive
Sleeve: Shield/Ground
GLOSSARY
The following are a few words that may serve you
well while reading this manual� These aren’t in depth
explanations, but should hopefully give you the basics
and a place to start�
Balanced Connections – balanced connections offer
three conductors, carrying a ground, an in-phase signal,
and an out-of-phase signal� Once the two signals are
sent from one device to another, the out-of-phase signal
has its phase inverted and the two signals are combined�
Any interference picked up along the way is removed
through to phase cancellation� This allows cables to be
run over long distances without collecting excessive
noise on the way�
Compressor – a Compressor reduces signals over a
user-dened threshold by a user-dened amount/ratio.
Dynamic Processor – is any kind of processor that
dynamically – or in real time – adjusts signal properties�
EQ – Equalizer – is a device or process that allows
users to boost or attenuate audio signals at specic
frequencies�
Euroblock – These types of inputs allow for self-wiring
of connections for permanent installations� Check the
“Getting Started” section for more information on wiring�

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GEQ – Graphic Equalizer – is in essence the same
as an equalizer, but this title is reserved for equalizers
with more ‘bands’ than the typical EQ. While a typical
channel EQ may only allow for 3 or 4 frequencies to be
adjusted, a graphic equalizer may allow for 31 different
frequencies�
GUI – Graphical User Interface – this is the remote PC
software used for the DMP801�
HPF – High Pass Filter – a high pass lter will cut or
signicantly reduce all audio signals below a particular
user-dened frequency, allowing – as the name suggests
– high frequency sounds to pass through�
High Shelf Filter – the high shelf lter will reduce or
increase all audio signals below a particular frequency�
The level at which the signal is boosted/attenuated is
determined by the user�
Limiter – work just as compressors do; however with
an input to output signal ratio permanently set to innity-
to-1�
LPF – Low Pass Filter – a low pass lter will cut all
audio signals above a particular user-dened frequency,
allowing low frequency sounds to pass through� This is
signicantly useful when using subwoofer speakers on
particular outputs�
Low Shelf Filter – the low shelf reduces or increases
the level of audio signals below a particular frequency
selected by the user� The level at which the signal is
altered is also set by the user�
Network – a network is a series or group of computers
that are interconnected so as to share information� In
the case of the DMP801, the network allows for remote
operation of the device using our Windows-based
computer�
Noise Gate – a noise gate is a dynamic process that
turns off or signicantly attenuates the audio signal
passing through it when the signal level falls below a
user adjustable threshold�
Unbalanced Connections – unlike balanced
connections, unbalanced connections only have 2
conductors: one for the signal and one for the grounding�
This, unfortunately, makes them more susceptible to
noise and interference�
CONTROLS &SETTINGS
FRONT PANEL
1. Mounting Holes
These holes are for mounting the DMP801 on a standard
19” rack�
2. Power Switch
Flick this switch to switch the unit on and off� Be aware
that the power switch can be disabled through the
Asystems DMP801 software�
3. Power LED
This LED indicator will illuminate when the DMP801 is
activated – whether by switch or through the remote
software�
4. Disable LED
This LED will light up when the power switch is disabled�
When this occurs, the DMP801 cannot be turned on or
off via the front panel switch� This function is disabled
within the Asystems PC software�
5. Mix Output LED
The Mix Output LED will light up green when an
output signal is present. It will also ash red when the
output channel clips� In this event, you can reduce any
excessive input signals, or turn down your master output
mix level through the control software�
6. Signal/Clip LED
This LED indicator is found on every input channel�
When a signal is present in the input channel, the LED
will light up green� When it clips, it will light up red� In the
event that the LED is red, we suggest reducing the input
signal level. Occasional ashes may be acceptable if it
doesn’t affect your program material�
7. Gain Controls
These rotary controls will allow users to adjust the nal
input level for channels 1 through 8�
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AUTOMATIC MIXER
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2
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REAR PANEL
8. Ethernet Connection
This connection is for standard RJ-45 cables, used
for 10/100 Ethernet control� Using a CAT5 twisted pair
copper cable, Asystems doesn’t recommend a distance
of more than 100 meters to the nearest computer or
hub� The Ethernet connection is used to control the
software via the PC control software and the RM-6E
programmable remote controls�
9. Euroblock Line Inputs
The DMP801 offers a total of eight line input channels�
These inputs are active balanced with euroblock
connectors� If an unbalanced signal is used, Asystems
advises that customers ground the unused conductor�
10. Mix Output
The DMP801 offers a single 3-pin Euroblock output�
These are servo-balanced euroblock connectors and can
be wired to either balanced or unbalanced connections�
11. Channel Inserts
Each of the 8 line input channels has its own insert point
through ¼” TRS phone jack� These accept standard
phone jack y-cables where the tip is used to send signals
from the DMP801 and the ring is used to return signals
back to the device�
12. Unit ID Controls
The Unit ID controls consist of a single rotary switch as
well as 8-pin DIP switch� These essentially adjust various
controls and settings as well as things like rmware
updates� More information on Unit ID settings can be
found in the relevant area of this manual� These controls
extend to IP address settings and initialization�
13. RS232 Connector
This standard RS232 connector is for third party control
systems� The Asystems control software does not work
through RS232, rather the RS232 port provides a simple
means for external control systems to be applied to the
DMP801�
14. 24VDC Input
This connector is used for emergency power to the
DMP801� This input connector can be used with a 24VDC
battery or power supply to ensure operation continues in
the event of power outage�
15. AC Power Connector
This is for a standard IEC power cable�
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9
10 1112
13
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DMP801
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DMP801 SOFTWARE
Connection
For a connection to be established between the
Asystems remote software and the DMP801, rst both
need to be connected to the same local area network�
After installing the Asystems Control Software, you
simply need to push the “SCAN” button located on the
bottom left-hand side of the software� This will locate and
identify any appropriate Asystems products�
After the scan is complete, your Asystems products will
be found to the left-hand side of the software� You can
add any of these to your setup using the main work area
of the software� The software’s connection to the device
is already complete and you can double-click the device
icon to operate the product’s various functions�
Firmware
It is possible to update the DMP801 rmware through the
network. This is done by rst connecting to the device
through the network� You must then launch the “Flash
Programmer” found in the pull-down menu at the top of
the software�
The rmware update must rst be downloaded from
www.asystems-sys.com. To start the rmware update,
the DMP801 must be able to receive the update� Pin 1
of the DIP switch on the back must be set to the upper
position to do so�
Select the rmware update le in the PC software by
clicking “Select File”. Once the new rmware le is
selected, you just need to check your unit’s IP address�
Provided your unit is already setup within the Flash
Programmer menu, click “Reprogram” to begin� Do not
turn off your computer or DMP801 during the rmware
update process�
DSP
The DSP page will give you an overall idea of input
and output mixes (including levels and naming) as well
as offer a manner to view and edit the current signal
processors assigned to input and output channels�
Name: Edit the name for each of the individual input
channels�
On/Off: Use this button to switch the corresponding
input channel on and off�
Processing: These buttons allow you to inject any of the
DMP801’s internal signal processors right into the input
chain� Processing will be accomplished in order from left
to right� For more information on the available programs,
check the Signal Processor section of this manual
Mix Matrix: The DMP801 essentially only has a single
output, therefore Matrix may be a bit of misnomer,
however this is used for routing your input signals
appropriately�
Reset Button: Pushing these buttons will reset the DSP
parameters for the input or output, including name, on/off
status, and selected signal processors� There is a reset
button available for each the input and output�
Monitoring: The DMP801 software offers extensive
monitoring for DSP performance� The percentage of the
processor used will be visible at the bottom of the page�

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Channel In Matrix
This page offers matrix mixing for the Analog inputs to the Channel Input mixes� Any of the input sources can be assigned
to the individual “Channel Input” mixes�
Each of the possible input matrix sources can have a number of controls available� These include:
Attenuation: Adjust the input level of each of the individual signals�
Panning: These will let you adjust the left/right mix of the incoming signals�
ALC: This button will assign the DMP801’s Automatic Limiter Compressor to the corresponding input signal�
Duck: Pushing this button will apply the ducking feature to the corresponding input signals� The duck function can be
activated as ducker 1, ducker 2, or off, the settings of which are decided by their respective menus�
INV: This button will invert the phase of the corresponding signal�
On: This button allows you to turn the corresponding input signal on and off� When turned off, the signal will not be sent
to the Input Channels selected�
Routing: Each of the 8 analog inputs can be assigned to the DMP801’s 8 input channels� These input channels are what
will be used for the DSP processing and will be then routed to your output mix�
Mix Matrix
This is where it all happens� Each of the 8 input channels and the 8 matrix inputs can be tweaked before being sent to
the main output�
Attenuation: Adjust the input level of each of the individual input signals or matrix mixes�
Panning: These will let you adjust the left/right mix of the incoming signals�
ALC: This button will assign the DMP801’s Automatic Limiter Compressor to the corresponding input (channel in, matrix
in).
Duck: Pushing this button will apply the ducking feature to the corresponding mix� The duck function can be activated as
ducker 1, ducker 2, or off, the settings of which are decided by their respective menus�
INV: This button will invert the phase of the corresponding input or matrix signal�
On: This button allows you to turn the corresponding input signal on and off� When turned off, the signal will not be sent
to any of the matrix outputs selected�
Routing: Each of the 8 analog inputs and matrix inputs can be assigned to the DMP801’s output mix�

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Signal Generator
The Channel Inputs and Matrix Output can have a signal generator applied to them� The option can be found in the
Channel Matrix and Mix Matrix pages� The signal generator can be activated with the “ON” buttons and assigned to the
appropriate mixes using the matrix/channel select section below the controls�
There are 4 different signals available, including White Noise and Pink Noise – ideal for setup of systems – and sine and
sweep waves – for testing of equipment and for general setup purposes�
Sine: The sine wave can be selected between 20 Hz and 20 kHz� The signal level can also be adjusted, and the signal
can be turned on and off�
Sweep: When using the sweep wave, a lowest and highest frequency can be selected� The sweep wave will move
between these frequencies and small increments� The hold time for each frequency can be selected by the users� There
are also controls for adjusting the signal level and turning the sweep wave on and off�
Pink Noise: The pink noise function includes level controls and on/off button�
White Noise: Like the pink noise, the white noise only offers level controls and an on/off button�
Control Panel
The control panel menu offers complete control of input channels� This menu includes level and gain controls, metering,
and a host of other parameters that can be edited�
Channel Name: A preselected channel name can be viewed or edited in this screen�
Fader: The input level can be adjusted using this onscreen fader�
Meters: The input and output signal level of the channel can be viewed through these meters� They can be adjusted
between pre- and post-fader meters�
Gain Reduction: The gain reduction meter will provide a real-time indication of any reduction in gain applied by the
internal DSP processes of the DMP801 (including compressors-limiters, equalizers, etcetera).
Limiter: This button will activate the internal limiter function for the corresponding channel�
Duck: Activate the ‘ducking’ feature by pushing this button� The duck function can be activated as ducker 1, ducker 2,
or off, the settings of which are decided by their respective menus�
INV: This button will invert the phase of the corresponding signal�
CH ON: This button will turn the corresponding channel on and off�
Gain Controls: The control panel menu offers 2 gain controls for each channel� The left gain control will indicate the
gain set by the DMP801’s onboard gain controls and cannot be edited through this software� The gain control on the right
indicates that set by a remote level control and can be edited using the DMP801’s software�
GAIN ON: Both the front and remote gain controls can be deactivated using these buttons�
Total Att.: This section will indicate the total amount of attenuation applied to an input signal, expressed in decibels�

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Network Settings
When using the DMP801 remote software – either within the local area network or through the internet – the network
settings need to be set appropriately to allow external computers to identify and connect to it�
Device Name: The name of the current device is found here� This can be adjusted by the user if necessary�
DHCP Server/Client: Users can activate DHCP – Dynamic Host Conguration Protocol – on the DMP801. The DMP801
can be selected as either a client or a server� When your local network runs off a DHCP protocol, the network will
automatically assign your DMP801 an IP address� If your network runs off a DHCP server, you can turn it on using the
DHCP Client button. If you wish to set your DMP801 as the DHCP server, turn it on here�
IP Address: When not using a DHCP server, you can enter an IP address for your DMP801 here� Otherwise it will
be automatically assigned� If entering your own IP address, Asystems suggests 192�168�x�99 – where “x” could be
determined by your local area network’s settings� Check network settings on other computers on the same network for
this value�
Subnet Mask: The subnet mask for your DMP801 can be entered into this eld. For most networks – and particularly if
you’re unsure what it is – this should be kept set as “255�255�255�0”�
Gateway Address: A gateway is a device that can connect other devices in a network that use different types of
protocols� This is typically your router, but a computer could also serve as a gateway�
Current Users: At the bottom of the page, a list of currently connected users will be displayed� This list will include the
user name, the IP address of the user and the level of access they’re afforded�

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Security
This tab can be found under the Network Settings menu� The security tab provides a means of securing the DMP801
against unauthorized or unqualied changes. Through the DMP801’s onboard software these accounts can be created
for use of the Asystems remote software�

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Global Settings
Analog In
Each of the analog inputs can have +48V of phantom power applied to it, ideal for condenser microphones. This menu
also allows the user to trim the signal slightly if levels are too excessive. A high-pass lter can also be added to each of
the analog inputs to help remove stage rumble and other unwanted noise�

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Global In On/Off
This menu provides on buttons for each individual input including the analog inputs and signal generator�
Ducker
The ducker allows a signal to temporarily attenuate below another signal when said signal activates the ducking feature�
This is useful when making announcements and other such times when a signal needs to be heard clearly� The ducker
can be activated on input and output channels by pushing the ‘Duck’ buttons found in the individual Matrix control pages�
There are two of these ‘duckers’ total on the DMP801�
Source: This is used to select the source of the duck function; ie� the trigger signal� When the selected source’s signal
rises to a user-selected level, the currently selected ‘duck’ signals will attenuate at the selected level�
Threshold: This determines the level that the source signal needs to be before the ducking function will be activated�
Depth: This determines how much the selected ‘duck’ signals will be attenuated�
Attack: The attack time is the time it takes for the ducking feature to kick in after the source signal passes the selected
threshold�
Release: The release time control will determine the time the ‘duck’ feature will remain active as the source signal drops
back below the set threshold�

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ALC – Auto Level Control
An autoleveler will allow users to dynamically change the level of an input or output signal to match a predened level
set by the user� The autolevel function can be activated for each individual mix in the matrix pages� The settings for these
autolevelers can be found within this ALC menu�
In Target: The target level setting allows users to select the desired signal level for their autoleveler� All signals that are
processed by the autoleveler will essentially aim for the target level�
Below Target: The below target threshold of the autoleveler is the point at which the autoleveler will kick in� Signals
below the threshold will not be affected, but signals above will be have their gain increased�
Ratio: The ratio is the input level change in decibels to the output level change in decibels�
Increase Gain: The increase gain determines the amount that the signal can be increased to meet the target level� This
helps prevent sudden, alarming changes in audio level�
Decrease Gain: The decrease gain works the same as the decrease gain, but in reverse� It determines the amount a
signal can be cut�
Hold Time: This determines the time the ALC will remain engaged after the signal falls back below the determined
threshold�

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Compressor/Limiter
This menu allows compressors and limiters to be applied to the channel output
Limiter Threshold: This control determines the threshold for the limiter function� This means that no signal will surpass
the selected threshold, being ‘compressed’ at a ratio of innity:1.
Compressor Threshold: Use this control to set the threshold of the compressor function� Any signals that surpass the
selected threshold will be compressed at the selected ratio�
Compressor Ratio: This control can be used to set the ratio for the compressor� The ratio is expressed as
<input>:<output>�
Compressor Attack: This control adjusts the attack time of the compressor, essentially determining the time taken for
the compressor to kick in after it passes the selected threshold�
Compressor Release: The release control determines the time the DMP801 will wait before disengaging the compressor
when the signal bypasses the selected threshold�
Side Chain HPF: This allows users to set a high pass lter on these channels to essentially help rid these channels of
low-frequency noise�

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System
System Clock: This menu allows you to select the internal sampling rate of the DMP801� Users are able to select
between either 44.1 or 48 kHz. The ENTER button must be pushed to conrm.
Power Settings: There are three power settings on the DMP801� The software power can be turned on and off,
essentially enabling the DMP801 to be turned on and off via the software – including event scheduling� The hardware
power can be selected on and off, essentially allow the unit to be activated and deactivated using the hardwired switch
on the front of the DMP801�

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Utility
All of the DSP processes can have their settings saved for later use� While there are a number of factory presets
available, users are always encouraged to nd their own settings and save them for later use. The DMP801 has onboard
storage for a number of settings to be saved, or users can connect USB ash drives to save settings. After the rmware
is updated, the initialize button can be selected to reset the device. Save any settings (or “scenes”) before initializing
the system�

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SIGNAL PROCESSORS
Below you will nd the onboard signal processors of the
DMP801 and information on their use and respective
parameter� These can be applied to any of the 8 input or
8 output channels of the DMP801�
Compressor-Limiter
Compressor Threshold: Use this control to set the
threshold of the compressor function� Any signals that
surpass the selected threshold will be compressed at the
selected ratio�
Compressor Attack: This control adjusts the attack time
of the compressor, essentially determining the time taken
for the compressor to kick in after it passes the selected
threshold�
Ratio: This control can be used to set the ratio for the
compressor� The ratio is expressed as <input>:<output>�
Compressor Release: The release control determines
the time the DMP801 will wait before disengaging the
compressor when the signal bypasses the selected
threshold�
Limiter Threshold: This control determines the threshold
for the limiter function� This means that no signal will
surpass the selected threshold, being ‘compressed’ at a
ratio of innity:1.
Output Gain: This control determines the amount of gain
applied to the signal after already passing through the
compressor-limiter�
On & Reset Buttons: The on button is, of course, used
to turn the Compressor-Limiter on and off, while the reset
button will reset all values to default�
Gate
On: This button turns the gate on and off�
Reset: Push the reset button to restore all parameters
back to default�
Dynamic Graph: This graph shows the currently set gate
properties and how it will affect your audio�
Level Meters: These meters give the input and output
level of the gate for the current channel�
Gain Reduction: The gain reduction meter will provide
a real-time indication of any reduction in signal caused
by the gate�
Threshold: This control will set the threshold of the gate
function� Any signals that fall below the set threshold will
activate the gate function�
Range: This control sets the amount of attenuation when
the gate is closed�
Attack: This control adjusts the attack time of the gate�
This is the time the DMP801 will wait after the signal
drops below the threshold before engaging the gate�
Hold: The hold will allow you to select the length of time
the gate will remain open after the signal drops below the
set threshold�
Release: The release control determines how long the
gate will wait before disengaging when the signal rises
back above the selected threshold�
Expander
On: This button turns the expander on and off�
Reset: Push the reset button to restore all parameters
back to default�
Dynamic Graph: This graph shows the currently set
expander properties and how it will affect your audio�
Level Meters: These meters give the input and output
level of the expander for the current channel�
Gain Reduction: The gain reduction meter will provide a
real-time indication of any reduction in signal caused by
the expander�
Threshold: This control will set the threshold of the
expander function� Any signals that fall below the set
threshold will activate the expander at the user-set ratio�
Ratio: This signal sets the ratio of the expander function�
When a signal drops below the threshold, the signal will
be decreased by the selected ratio�
Attack: This control adjusts the attack time of the gate�
This is the time the DMP801 will wait after the signal
drops below the threshold before engaging the gate�
Release: The release control determines how long the
gate will wait before disengaging when the signal rises
back above the selected threshold�
Delay
Adding a delay on output can be particularly helpful to
help time align drivers within a single cabinet or help avoid
delay in larger multi speaker setups� For example, when
there are a number of drivers in a single cabinet, typically
they’re different distances from the front of the cabinet�
The tweeter, typically longer than the woofer, could have
its driver 8 inches deeper than the woofer� The problem
this creates is the sound from the woofer will be pushed
out a fraction of a second before the tweeter, arriving at
the wavefront at different times� Adding a 0�6 millisecond
delay to the woofer can combat this, essentially making
the signal wait for the tweeter to catch up�
Delay: Use this control to adjust the delay time� To the
right of the control, the selected delay will be indicated in
milliseconds, meters and feet�
Temperature Control: This allows you to set the current
temperature for the delay circuit� This allows the DMP801
to better rene the delay’s ‘meter’ and ‘feet’ results. The
temperature is indicated in both degrees Celsius and
degrees Fahrenheit�
On & Reset Buttons: The on button is used to turn the
delay circuit on and off� The reset button resets all values
to default�

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DMP801
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Parametric Equalizers
EQ On/Off Button: This button can turn the Equalizer for
the currently selected channel on and off�
Reset: Push the reset button to restore all parameters
back to default�
EQ Band On/Off: Use these buttons to turn the
corresponding EQ bands on and off. While not named
specically, these bands can be thought of as the low,
low-mid, high-mid and high frequency bands on your
average 4-band EQ.
EQ Type: For the rst and fourth bands on the EQ, users
can select the type of curve used for the EQ. Band 1
can be swapped between a normal EQ band (PEAK),
low shelf lter (SHELF), and high pass lter (CUT). Band
4 can be selected between an EQ band (PEAK), high
shelf lter (SHELF), and low pass lter (CUT). The Low/
High Pass Filters will cut frequencies above and below
the selected frequencies at 18 dB per octave� High and
Low Shelf lters act similarly, but cut frequencies below
the selected frequency by the preset level determined by
the user�
EQ Parameters: The EQ offers users the ability to view
or edit various parameters/properties of their EQ bands,
including the Gain (dB), the frequency (Hz/kHz) and the
‘Q’ of the EQ band.
Meters: Both input and output meters are available for
this process, essentially showing the difference in the
overall signal level after equalization�
Feedback Silencer
Feedback occurs when the sound from your speakers
makes its way back into the mixer through microphones�
The audio look causes a high pitch squeal or screech
that can easily ruin your performance� Feedback can be
removed, however, by reducing or removing the problem
frequencies. With a razor-thin lter, feedback can be
completely removed without affecting your audio what-
so-ever�
The DMP801 features a 12 lter feedback silencer.
This can operate in 2 different modes: Automatic and
Manual. When set to automatic, the activated lters will
automatically search for and remove feedback� When set
to manual, the user is able to adjust the frequency, gain
and Q of the individual lters.
Parameters: When the Feedback Silencer is set to
“Manual” it offers users the ability to view or edit various
parameters/properties of their EQ bands, including the
Gain (dB), the frequency (Hz/kHz) and the ‘Q’ of the 12
lters.
Threshold: Adjusting the threshold will determine
the level of signal required for the automatic feedback
silencer to kick in�
31-band GEQ
Graphic equalizers are fantastic in live setups where you
may need to compensate for room acoustics or other
factors� Include a 31-band graphic equalizer on your
speaker output signals to better rene your live audio.
Frequency bands: The GEQ’s frequency bands can be
boost or cut by the user. Frequencies are set at xed
frequencies between 20Hz and 20kHz�
TROUBLESHOOTING
I don’t have any output
Have you activated the output channels? Do you see a
signal in the output meters? Have you correctly routed
your inputs to channels, turned levels up, and unmuted
mixes? Have you applied an excessive compressor-
limiter to any input or output signals?
I have a signal, but it’s really distorted!
Are any of the Clip LEDs lighting up for input or output
mixes? Do any of the signals on your entire audio chain
seem excessive? This could include input connectors,
channel inputs, matrix outputs�
My devices are not communicating via Ethernet
Are the red and green LEDs on the Ethernet connectors
lighting up? Are you using a decent quality Ethernet
cable?
My DMP801 won’t communicate with my computer
Are you using a decent quality Ethernet cable? Are your
computer and DMP801 both connected to the same
network? Do you have a rewall turned on?
How can I use the RS-232 port?
An RS-232 connection is available on the DMP801 to
allow control information to be sent to the unit without the
need of Ethernet connection� Asystems has provided an
implementation reference on the website�
Initializing the DMP801
The DMP801 can be initialized using the DIP switch on
the rear of the device� The left-most pin will allow users
to begin initializing the unit� It can be returned to the
RESUME position to continue operation�
Why are the front panel VRs not working?
The rear panel has a DIP switch that controls these VRs�
If set to the lower position these will be locked and you
will be unable to use them�

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DMP801
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SPECIFICATIONS
DMP 801
Input Connections Balanced Euroblock
Output Connections 1/4” TRS (insert / direct output)
Front Panel Indicators 8 x Input/Peak, 1 x Mix Output/Peak,
1 x Power, 1 x Network
Signal to Noise (20Hz-20KHz, unweighted) >110dB
Frequency Response 20Hz-20kHz, +/-1dB
Input Impedance 20K Ohm, balanced
Maximum Input Level 20dBu
Total Harmonic Distortion 0�002%
Processor 40-bit oating point
Input A/D Conversion 24-bit
Output D/A Conversion 24-bit
Sample Rates 44�1 kHz, 48 kHz
DIP Switches Network ID, 0 - F
Parametric Equalizers 4-band, adjustable Q, freq. and level
EQ lters All pass, band pass, hi/lo shelf
Compressor Threshold, range, attack, release
Feedback Silencer Fixed / Dynamic
Auto-mixing Input level, output level, priority, NOM attenuation max�
Phantom Power +48V DC
Power & Physical
Power Supply 120VAC/240VAC switching power supply,
15A Edison cable
External Power 2-pin euroblock, +24V DC
Dimensions 1 standard 19” rack unit