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Lectrosonics DM84
Digital Automatic Matrix Processor, 8 In, 4 Out

OUR PART #:  DM84

The DM84 is an 8-in, 4-out digital matrix processor with the capability to route any combination of inputs to any combination of outputs with extremely low throughput latency.
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Lectrosonics DM84
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The DM84 is an 8-in, 4-out digital matrix processor with the capability to route any combination of inputs to any combination of outputs with extremely low throughput latency. Automatic microphone mixing is accomplished via a patented Adaptive Proportional Gain algorithm. Sophisticated filtering is offered on each input and output. A compressor is available on each input, a compressor and limiter on each output. In addition, each input and output can be configured with a delay setting of up to 100 ms for inputs, 250 ms for outputs. The DM84 runs on the latest-generation DSP architecture and can be integrated as part of a larger system by connecting other DM units (like the DMTH4) via the Digital Audio Network Interface (DANI) bus.

The DM84 has enhanced expandibility - up to a limit of three, combining multiple DM84 units expands not only the number of the mic inputs, but also the number of distinct outputs/mix busses in the system. Stacking 2 units creates a 16x8 mixing matrix; stacking 3 units creates a 24x12 mixing matrix. While individual outputs/mix busses are normally treated as independent NOM busses for microphone mixing, the DM84's "phantom" mix mode capability allows multiple mix busses to be combined into a single NOM bus for mix-minus sound reinforcement applications.

The DM84 offers eight mic/line inputs with four mic/line outputs; switchable phantom power to handle condenser microphones; programmable front-panel control knobs for easy input and output gain adjustment; front panel indicators for input and output channel activity; and auto mic mixing with Proportional Gain and AutoSkew. The unit is AMX® and CRESTRON® compatible with USB and RS-232 interfaces for setup and control. Also, a programmable I/O interface allows control using contact closures or voltage levels as well as system status monitoring.

Features

  • 8-in/4-out digital matrix architecture
  • Stackable with enlarged matrix up to 24-in/12-out
  • Front panel level controls with activity LEDs
  • 6 filters plus compressor on each input
  • 9 filters plus compressor/limiter on each output
  • USB and RS-232 interfaces for setup and control
  • Fully balanced audio signal flow through entire system
  • Digital I/O ports for connection to other LecNet 2 devices
  • Proportional gain auto mixing algorithm with AutoSkew™ - US Patent 5,414,776
  • Simultaneous LecNet2 and Third-Party control

Audio Inputs

  • Gain: -10 dB to +60 dB, programmable in 1 dB steps
  • Input impedance: 2.5 k Ohm
  • Phantom voltage: 15 V, programmable
  • Connector: 5-pin Phoenix

Audio Outputs - Floating balanced, either side can be grounded

  • Nominal level: 0 dBu all outputs, -40 dBu selectable on outputs 9 through 12
  • Output impedance: 450 Ohms differential programmable outputs at line level; 5 Ohm differential programmable outputs at microphone level

Audio Performance

  • IMD + noise: 0.1% max. 0.02% nominal input level
  • THD + noise: 0.1% (worst case) 0.02% nominal input level
  • EIN: -126 dBu

Connectors

  • Audio I/O: 5-pin Phoenix
  • Expansion: RJ45
  • Logic I/O: DB25
  • Serial: Standard USB and mini TRS

Digital Audio Network Interface (DANI)

  • Physical level: LVDS (Low Voltage DIfferential Signal)
  • Connector: Four RJ-45
  • Cable quality: Shielded CAT-5
  • Transmission speed: 50 Mbits/s

Programmable Control Inputs

  • Number of inputs: 11
  • Analog voltage range: 0-5V
  • Logic input: TTL, LVTTL, CMOS, LVCMOS

Programmable Control Outputs

  • Number of logic outputs: 8
  • Logic control: active low
  • Max sink current: 100 mA
  • Max supply voltage: 40 V
  • Supply voltage for control I/O: 5 V
  • Max current: 750 mA

Specifications

  • Input Dynamic Range: 96 dB at -50 dBu input level 102 dB at all other levels (unweighted 20 - 20 kHz)
  • Output Dynamic Range: 105 dB (unweighted 20 - 20 kHz)
  • Power requirements: 100-240 VAC, 47-63 Hz
  • Power consumption: 15 Watts

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