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 expandability – 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 16×8 mixing matrix; stacking 3 units creates a 24×12 mixing matrix. While individual outputs/mix buses are normally treated as independent NOM buses 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.

Accessories

The DM84 combines a stackable 8-in/4-out automatic matrix mixer with a powerful DSP signal processing package and extensive remote control capabilities for any sound system application with multiple microphones and loudspeakers. Multiple DM84 units can be stacked to expand the matrix with unlimited inputs and up to 12 outputs. The unit also supports the full LecNet2 digital matrix, so it can also be integrated with other DM Series processors in 24 output systems. The primary applications are in sound reinforcement and recording in boardrooms, courtrooms, worship centers, distance learning systems, hotels and other applications that benefit from matrix signal routing, automatic mixing and remote control options. Once setup is completed with the supplied LecNet2 software, the unit runs as a standalone device. Front panel controls are provided to make minor adjustments to the input and output levels, expanding its usefulness into stand-alone applications. The adjustment range of each control is defined in the software setup to optimize it for various needs. The DSP features include a full complement of filters, ADFE (automatic digital feedback eliminators), compressors, limiters and delay on every channel to optimize the signal processing needed for every application. This processing is available at the inputs to compensate for microphone placement and signal characteristics, or to adjust for differences in tonal quality or dynamics of various signal sources. Each output has individual filters and a proprietary, adaptive time constant compressor/limiter to feed recorders or power amplifiers.

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
• 8-in/4-out digital matrix architecture with I/O ports for stacking
• Programmable front panel level controls with activity LEDs
• 6 filters, 6 feedback eliminators (ADFE), compressor and delay on each input
• 9 filters, delay and compressor/limiter on each output
• USB and RS-232 interfaces for setup and comprehensive remote control
• Balanced, floating differential inputs and outputs - no pin 1 problem
• 128 global macros, each with up to 64 commands, and 115 characters per command

Digital Matrix Processor

Extensive control capability is built into the unit with an intuitive command structure to allow external control with USB or RS-232 connections. Touch panel control systems easily integrate into the command structure. Remote control, monitoring and setup can also be done via ethernet connections using a low cost interface provided by another manufacturer. Up to 128 macros can be stored in internal memory. Each macro can contain up to 64 commands, with 115 characters in each command. Macros can be invoked with serial commands from touch panel control systems or contact switches connected to the logic I/O ports on the rear panel. The macros can be chained so that one macro can call another one, which may call yet another one. In addition, a built-in macro recorder greatly simplifies the creation and use of macros. The audio inputs and outputs are balanced, differential circuits (no pin 1 problem) to eliminate noise from external RF and power sources, even with long cable runs. The patented gain proportional automatic mixing algorithm* is applied at the crosspoints in the matrix so each input can behave differently at each output. For example, input 4 can be a microphone that participates in the NOM attenuation applied by the auto mixing algorithm at some of the ouputs, and operate as a direct signal for recording at other outputs.

Specifications

• Audio I/O: 5-pin Phoenix
• Gain: -10 dB to +60 dB; programmable 1 dB steps
• Expansion: RJ45
• Input impedance: 2.5 k Ohm
• Logic I/O: DB25
• Phantom voltage: 15V, programmable
• Serial: Standard USB and mini TRS
• Connector: 5-pin Phoenix
• Audio outputs: Floating balanced, either side can be grounded
• Physical level: LVDS (Low Voltage DIfferential Signal)
• Nominal level: 0 dBu all outputs, -40 dBu selectable on high speed
• Cable quality: Shielded CAT-5
• Transmission speed: 50 Mbits/s
• Input Dynamic Range: 96 dB at -50 dBu input level; 102 dB at all
• Number of inputs: 11
• Analog voltage range: 0-5V
• Logic input: TTL, LVTTL, CMOS, LVCMOS
• Output Dynamic Range: 105 dB (unweighted 20 - 20 kHz)
• IMD + noise: 0.1% max.
• Logic control: Active low
• Max sink current: 100 mA
• THD + noise: 0.1% (worst case)
• Max supply voltage: 40 V
• Supply voltage for control I/O: 5V
• Max current: 750 mA
• EIN: -126 dBu
• Power requirements: 100-240 VAC, 47-63 Hz
• Power consumption: 15 Watts