Audio Interactive Quad Dynamics Processor MDX 4400

IKA (Interactive Knee Adaptation) compressor concept combines the advantages of “hard knee” and “soft knee” characteristics - switchable high-pass filter in control signal path avoids low-frequency signals from dominating compressor action - IGC (Interactive Gain Control) peak limiter combines clipper with program limiter circuits - extremely low-noise operational amplifiers and high-grade VCAs - High-quality detented potentiometers and backlit switches - stereo couple function for channels 1/2 and 3/4 selectable with real sum of RMS output -  Accurate 8-segment LED meters for input level, output level and gain reduction -  operating level switchable from +4 dBu to -10 dBV -  servo-balanced inputs and outputs featuring 1/4" jacks and XLR connectors - Bandwidth 20 Hz to 20kHz, +0/-0.5 dB -Frequency response: 0.35 Hz to 200 kHz, +0/-3 dB - Noise> 95 dBu, unweighted, 22 Hz to 22 kHz -THD: 0.008 % typ. +4 dBu, 1 kHz, Gain 10.04 % typ. +20 dBu, 1 kHz, Gain 1IMD 0.01 % typ. SMPTE Crosstalk < -100 dB, 22 Hz to 22 kHz - Stereo Coupling true RMS detection - Impedance 50 kOhm balanced, 25 kOhm unbalanced - indicators gain reduction: 8 element LED display: 1/3/6/10/15/20/25/30 dB - INPUT/OUTPUT LEVEL: 8 element LED display: -24/-18/-12/-6/0/+6/+12/+18 dB - Peak Limiter Threshold: 1 LED for Indication of Limiter function - Function switch - LED indicator for each.

Here you find 18 models, 16 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Behringer International GmbH; Willich