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Peer Review- Lectrosonics DM1624 Digital Matrix Mixer

Peer Review- Lectrosonics DM1624 Digital Matrix Mixer; Price: $4,550 MSRP

My Results:

The conference center at the D.C. Bar Association consists of three meeting spaces that can be combined to form two rooms or a single, large room. The clients needed sound reinforcement and multi-track recording for each room, as well as the ability to send audio to two overflow rooms. They also wanted a simpler user interface that could be easily understood. Their existing system had a series of selector panels to route the room audio to a pair of recorders and set up the various room combining configurations.

A single Lectrosonics DM1624 was installed as the heart of the system. Inputs to the mixer consisted of three wireless headset systems (one per room) and 12 hardwired jacks (four per room). Eighteen outputs were used to feed each of the three meeting rooms, two overflow rooms, two stereo digital media recorders, a FireWire digital recording interface, and an operator's headphone. The mixer's built-in DSP was used to provide individual room equalization for each of the meeting and overflow rooms, as well as feedback protection for each input channel.

An LCD touchscreen control panel was installed at the registration desk to serve as the user interface to the DM1624. A second panel was located at the equipment rack. Using a series of simple menu screens, the operators can control how the rooms are combined, which rooms feed the overflow rooms, which rooms feed each recorder, start and stop of each recorder, and which room audio feeds the operator's headphone. Macros were written to perform the necessary input and output routing assignments when executed via serial commands from the touchpanels, which made it much easier to ensure that all the inputs were routed to the proper rooms and recorders as the various combinations were recalled.

In addition to the LCD panels, momentary rocker switches in each room were wired into the mixer's programmable control ports, and were configured to act as master volume controls. Momentary switches were selected over conventional potentiometers, as it ensured the volume levels would return to a predetermined setting upon power up.

At the conclusion of the project, the client was pleased with both the dramatic improvements in audio quality and the ease of control the Lectrosonics DM1624 provided.

In the end, the DM1624 replaced nine individual pieces of gear, cleaned up the audio, and simplified operation. Not a bad day's work!


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Gain: -10 dB to +60 dB, programmable in 1 dB steps

Input Impedance: 2.5 k ohm

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