AKG Acoustics GmbH

DMM 4/2/2

  • 4 microphone and 2 stereo AUX inputs
  • 1 recording output and 1 master output
  • Digital signal processing including dbx® compressor/limiter
  • Intelligent mixing algorithm with noise sensitive threshold
  • 19” all-metal case with integrated power supply

The DMM 4/2/2 is a processor controlled digital automatic mixer with four balanced microphone inputs, two stereo AUX inputs and one master output. A unique and highly effective, intelligent mixing algorithm automatically allocates gain among the system microphones (NOM attenuation). A special noise detection function and the “Noise Sensitive Threshold” algorithm (NST) prevent accidental activation of input channels.

The mixing algorithm also includes a “Last Mic On” function and a “Best Mic On” mode. Each input channel features low cut as well as LF and HF shelving filters. A dbx® compressor/limiter is included in the algorithm to compensate for level differences and provide a significant improvement in sound quality. Each channel offers switchable gain (Mic/Line, Mic-Lo/Mic-Hi), switchable phantom power, and an incremental level control with LED level and peak hold display. The automixing and ducking functions can be enabled and disabled for each microphone and AUX channel separately.

An expansion connector enables multiple DMM 4/2/2 mixers to be daisy-chained for larger systems. A rear-panel control I/O port provides logic in and outputs for controlling external devices.
The DMM 4/2/2 is housed a rugged 19” case with an integrated power supply.

For technical specifications please refer to the product cut sheet under downloads, see below.

© 2012 AKG Acoustics GmbH

The digital automatic microphone mixer shall have four microphone and two line level inputs in a 1-U, 19” rack mount case. The automixer shall incorporate an adaptive gain mixing algorithm using a noise sensitive threshold. NOM (number of open microphones) attenuation as well as last mic on and best mic on functions shall be implemented by the algorithm. The mixer shall contain four microphone input channels with 3-pin XLR connectors. Each input shall be balanced, RF-filtered, and capable of receiving mic or line level input signals. Switchable phantom power shall be provided for each input. The mixer shall incorporate two unbalanced, RF-filtered AUX inputs with RCA connectors.
One recording output on RCA connectors and one master output on a 3-pin XLR connector shall be available.
The mixer shall provide remote control capability via logic in/outs on a Sub-D connector.
Each input shall incorporate a volume control, high frequency shelving filter, low frequency shelving filter, and a switchable bass cut filter. The main output shall have an adjustable limiter as well as a master level control. All functions shall be controlled by incremental controls on the front panel. The mixer shall provide a software locking function to prevent unwanted operation of controls.
Expansion ports shall provide I/O access to the main and mix audio busses.
The mixer shall meet the following performance criteria. Frequency response: 20 Hz - 20 kHz; maximum input level: +15 dBu; maximum output level: +10 dBu; input impedance: > 8K ohms; S/N ratio: > 90 dB; maximum output level: +26 dBu, maximum gain: 75 dB (input to output). The mixer shall be rack mountable and occupy 1 U of rack space. The automatic microphone mixer shall be the AKG Acoustics Model DMM 4/2/2.
 



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