Conference and lectern
Houses of worship
Boardrooms
Courtrooms
Studio
DMM 4/2/2
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.
