ALLEN & HEATH CQ-20B User Manual

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User Guide V1.1.0 Issue 1
AMM (Auto Mic Mixer)
CQ’s Automatic Microphone Mixer uses a gain sharing algorithm, designed for use
in multi-microphone speech applications like conferences, meetings, broadcasting
and podcasts. It can be used on every mono input channel of the CQ with two
banks shown at the top of the page.
The AMM algorithm looks at the incoming signal level, the priority setting and
(optionally) the fader level, then adds gain (level) to any channel in use, while
reducing gain on the other channels. This reduces background noise and the
chance of feedback while improving intelligibility.
In/Out – Switch the whole AMM on or off.
On/Off – Enable or disable AMM on each channel individually.
Priority Faders – Adjust priority of each channel in the calculation.
Follow Fader – When on, the calculation considers the input send level to Main LR.

ALLEN & HEATH CQ-20B Specifications

General

Frequency range	20 - 20000 Hz
Channels quantity	24 channels
Supported sample rates	96 kHz
Digital sound processing	- bit
Nominal input level	17 dBu
Output impedance	75 Ω
Total Harmonic Distortion (THD)	0.002 %
Built-in display	-
Card reader integrated	Yes
Compatible memory cards	SD, SDHC
Maximum memory card size	32 GB
Bluetooth version	4.1
XLR out	8
RJ-45 ports quantity	1
USB 2.0 ports quantity	2
Number of microphone inputs	20
Rack capacity	19U
USB connector type	USB Type-A, USB Type-B
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (typical)	- W

Weight and Dimensions

Depth	154 mm
Width	372 mm
Height	134 mm
Weight	2600 g
Package type	Box
Package depth	260 mm
Package width	450 mm
Package height	250 mm
Package weight	3300 g