Lectrosonics 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. 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