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

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

OutputsFloating 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