The DM812F is a powerful digital audio processing, mixing and routing system. The primary applications are sound reinforcement and conferencing in boardrooms, courtrooms, worship centers, distance learning systems, hotels and other applications with multiple microphones and loudspeakers. The design represents a milestone in DSP technology in its basic architecture and in its processing speed and efficiency.

The basic architecture consists of 8 mic/line inputs and 12 outputs with a full DSP-based crosspoint matrix that allows every input to be routed to any or all outputs. Following the A-D conversion at each input, the signal passes through multiple DSP filters, ADFE (automatic digital feedback eliminator), a compressor and a digital delay. In the matrix, gain is adjustable from -69 to +20 dB in 1 dB steps at each crosspoint. Each of the 24 outputs provides a digital delay, multiple DSP filters and a compressor/limiter.

AMX® is a registered trademark of AMX Corp. Crestron® is a registered trademark of Crestron Electronics, Inc.

Accessories

The DM Series is a powerful hardware/software family of components providing digital audio processing, mixing and routing. The primary applications are sound reinforcement and conferencing in boardrooms, courtrooms, worship centers, distance learning, hotels and other applications with multiple microphones and loudspeakers. Easily configurable using a computer system with Windows® XP, Vista or 7 operating systems, the DM Series design represents a milestone in DSP technology in its basic architecture and processing speed, with outstanding and scalability and flexibility. The three models shown here provide 8-in/12-out, 16-in/12-out and 16-in/24-out models which may be stacked in a master/slave configuration to expand the number of inputs for any size system. The number of outputs is limited to the number of outputs on the model used as the system master. US Patents: 5,414,776 and 5,402,500 Minimal Latency Studies have shown that even very slight delays in speech can affect the tempo of a conversation or a conference. The effect is sometimes subtle but delays over 10mS can cause real problems – something we have all experienced when talking on a cell phone. The throughput latency of the Lectrosonics DM Series products is a scant 2 ms, independent of how much processing is being used. Optimized ArchitectureTM Some digital matrix processors give you a “gas gauge” or “resource meter” to show you how much processing power remains available. As you add more input modules, delays, filters, etc. you eventually run out of available DSP resources. There is no gas gauge in the Lectrosonics DM Series products, simply because they don’t need one. No matter how many filters, delays, or other processing you engage, or how many signals are routed through your DM Series unit, you will never run out of DSP resources.

Features

• Patented proportional gain auto mixing*
• Optimized ArchitectureTM for unlimited DSP resources – no “Gas Gauge”
• 6 filter stages plus compressor, ADFE and delay on each input
• 9 filter stages plus compressor, limiter and delay on each output
• 128 global macros available with up to 64 commands per macro
• AMX© and CRESTRON® compatible
• Simultaneous LecNet2 and Third-Party control
• Optimized Architecture for unlimited DSP resources - no “Gas Gauge”

Versatile, Easy Control

The LecNet2 communications protocol supports simultaneous use of USB and RS232 ports by the PC software control panel and a third party serial control system such as AMX® or Crestron®. Installers can use the GUI to monitor the state of the DM device for the purpose of verifying that commands sent from the 3rd party controller (over RS232) are working correctly.

Specifications

• Gain: -10 dB to +60 dB, programmable in 1 dB steps
• Physical level: LVDS (Low Voltage DIfferential Signal) high speed
• Input impedance: 2.5 k Ohm
• Phantom voltage: 15 V, programmable
• Connector: Four RJ-45
• Cable quality: Shielded CAT-5
• Audio outputs: Floating balanced, either side can be grounded
• Transmission speed: 50 Mbits/s
• Nominal level: 0 dBu all outputs, -40 dBu selectable on outputs 9 Programmable control inputs
• Number of inputs: 22
• Line Only: • 50 Ohms differential line level only outputs
• Analog voltage range: 0-5V
• Logic input: TTL, LVTTL, CMOS, LVCMOS
• Number of logic outputs: 16
• Input Dynamic Range: 96 dB at -50 dBu input level 102 dB at all other levels
• Logic control: active low
• Max sink current: 100 mA
• Output Dynamic Range: 105 dB (unweighted 20 - 20 kHz)
• Max supply voltage: 40 V
• Supply voltage for control I/O: 5V
• IMD + noise: 0.1% max.
• Max current: 750 mA
• THD + noise: 0.1% (worst case)
• Power requirements: 100-240 VAC, 47-63 Hz
• Power consumption: 30 Watts
• EIN: -126 dBu
• Fan Cooling: Continuous; DM1612F and DM1624F only
• Connectors: Dimensions:
• Audio I/O: 5-pin Phoenix
• Expansion: RJ45 DM812 (1.75 in. high) (7.5 in. deep) (19 in. wide)
• Logic I/O: DB25 DM1612F (3.5 in. high) (7.5 in. deep) (19 in. wide)
• Serial: Standard USB and mini TRS DM1624F (3.5 in. high) (7.5 in. deep) (19 in. wide)