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3 Applications
The audio matrix router DRM-884 is designed for fixed installation of
PA systems . It is suited for versatile applications . DRM-884 is equipped
with eight analog inputs and eight analog outputs . The inputs can be
connected to the outputs as desired . With additional components, it is
possible to increase the number of inputs and outputs of DRM-884 to
12 each . When multiple DRM-884 devices are combined, the number
of connections can be increased to up to 192 inputs and 192 outputs .
The integrated signal processor allows you to process the input
signals and output signals by means of filters (crossover networks /
equalizers), delays, gates/expanders and compressors/limiters . Func-
tions to automatically fade out background music (ducker) and noise
(automatic mixer) and to suppress feedback noise (feedback controller)
make handling of the PA system easier and improve speech intelligi-
bility of announcements .
The device is configured by means of PC software on a computer
connected to DRM-884 via Ethernet . Configurations for various appli-
cations can be saved to DRM-884 or to the computer and be retrieved
when required . Via RS-232 interface, remote control of DRM-884 is
also possible .
The possibilities of extensions available as accessories are described
below .
3.1 Extension possibilities
3.1.1 Zone paging microphone DRM-884RC
The zone paging microphone DRM-884RC is used for announcements .
To make announcements, the outputs of one or multiple DRM-884
devices are assigned to different zones . Zone names can be selected,
for example with reference to the place of PA application . Before
making an announcement, the person using the microphone defines
the desired zone(s) and adjusts the volume of the announcement .
An automatic chime can precede an announcement . The chime
signal can be replaced by an individual audio file in MP3 format, if
required .
When multiple DRM-884RC microphones are used, different pri-
orities can be defined so that a specific microphone will take priority .
Note: When multiple DRM-884 devices are used, a Dante connection of the
DRM-884 devices via the extensions DRM-884DTM is required for making
announcements across the devices (
3.1.2 Volume control DRM-884VP
The wall module DRM-884VP is used to adjust the volume at the place
of PA application itself . It is also possible to assign different inputs of
DRM-884 to specific outputs so that the users will be able to select
their audio source on site .
The module is equipped with a feed-through output to connect
another DRM-884VP .
3.1.3 Volume control with audio output DRM-884VAP
The wall module DRM-884VAP offers the same features as the module
DRM-884VP . In addition, it has two analog audio outputs, but it has
no feed-through output to connect another extension module .
3.1.4 Connection extension DRM-884IOP
The wall module DRM-884IOP offers additional connection options,
e . g . at the place of PA application . It features two analog inputs for
audio sources with line signal level (RCA jacks) . As an alternative to
one of the two inputs, a microphone input (XLR jack) is provided .
Its sensitivity is adjustable and phantom power (e . g . for condenser
microphones) can be activated for this input .
The module also has two balanced analog outputs . For permanent
connection, these outputs are designed as screw terminals and can
also be used, for example, to connect amplifiers or active speakers .
28
☞
chapter 6) .
3.1.5 Dante interface module DRM-884DTM
The module DRM-884DTM includes a Dante interface . Thus, eight
digital inputs and outputs each are additionally made available to
DRM-884 .
Dante, an audio network developed by the company Audinate,
allows transmission of up to 512 audio channels at the same time .
Dante (Digital Audio Network Through Ethernet) uses a common
Ethernet standard and is based on the Internet protocol . The trans-
mission of audio signals is uncompressed and synchronized, with
minimum latency . The advantage over analog audio signal trans-
mission is a cost-effective connection of components via standard
network cables and low susceptibility to interference, even in case of
long transmission paths . In addition, signal routing between compo-
nents that have once been connected can be changed by software
at any time . In the Dante network, devices configured as transmitters
are used as signal sources . By means of the program "Dante Virtual
Soundcard" from the company Audinate, computers can also be used
as signal sources, e . g . to feed audio files replayed on the computer to
the Dante network . Devices configured as receivers (e . g . amplifiers)
receive signals from the Dante network .
DRM-884DTM is equipped with eight transmitter channels (Out-
put Net01 – Net08) and eight receiver channels (Input Net01 – Net08) .
The transmitters and receivers in the Dante network are assigned via
the Dante configuration program "Dante Controller" (
The Ethernet interface is also configured via the program "Dante
Controller" (
☞
chapter 5 .2) . For correct configuration, knowledge
of network technology is indispensable .
Note: When multiple DRM-884 devices are used, the Dante network will allow
connection across the devices between the analog inputs and outputs .
DanteTM is a trademark of Audinate Pty Ltd.
4 Setup and Connection
DRM-884 is designed for installation into a rack (483 mm / 19"), but
it can also be set up as desired .
For installation into a rack, it requires a height of 1 RS (1 RS = rack
space = 44 .45 mm) .
Always switch off DRM-884 and the devices to be connected before
making or changing any connections .
4.1 Audio sources
Connect microphones or audio sources with line level, e . g . the output
of a preamplifier or mixer, to the pin connector INPUT (15) via the
plug-in screw terminals provided . The jacks are balanced . To connect
sources with unbalanced signals, bridge the contacts ⏊ and − .
When microphones are connected, the sensitivity of the input
can be increased in the device settings (via the PC program) . It is also
possible to activate phantom power separately for each input .
Caution: Never connect any audio source with unbalanced output when phantom
power has been activated . The audio source may be damaged!
4.2 Power amplifiers
Usually, power amplifiers or active speakers are connected to the out-
puts of DRM-884, but it is also possible to connect other devices for
further signal processing . Connect the line level inputs of the devices
to the pin connector OUTPUT (14) via the plug-in screw terminals
provided . The outputs are balanced .
4.3 Switching outputs
Two switching outputs are available to switch external devices via the
control program . Connect a device to be switched to the desired relay
contact pair RELAY 1 or 2 (13) via the plug-in screw terminals . The
contact rating is ⎓ 30 V/ 2 A .
☞
chapter 5) .
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