Lectrosonics DM84: 8-in/4-out Digital Matrix Processor

The Lectrosonics 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 Lectrosonic 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 Lectrosonics DM Series processors in 24 output systems.

Lectrosonics DM84 Features:

• 8-in/4-out digital matrix architecture in a stackable configuration
• 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!
• Digital I/O ports for "daisy chaining" and to connect other LecNet 2 devices
• Proportional gain auto mixing algorithm with AutoSkew™ - US Patent 5,414,776
• 128 global macros, each with up to 64 commands, and 115 characters per command

The primary applications for the Lectrosonics DM84 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 of the Lectrosonics DM84 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 Lectrosonics DM84 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.

Extensive control capability is built into the Lectrosonics DM84 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 Lectrosonics DM84 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 Lectrosonics DM84 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.