IKA (Interactive Knee Adaptation) compressor concept combines the advantages of “hard knee” and “soft knee” characteristics. Attack and Release times controllable automatically or manually. Switchable high-pass filter in control signal path avoids low-frequency signals from dominating compressor. Compression characteristics switchable between IKA and “hard knee” characteristics IRC circuit in expander/gate enables “inaudible” elimination of disturbing noise signals. Dynamic Enhancer for compression dependent equalization. Extremely low-noise operational amplifiers and high-grade VCAs. High-quality detented potentiometers and backlit switches. Stereo Couple function selectable with real totaling of RMS output .Accurate 12-segment LED meters for input level, output level and gain reduction. Switchable sidechain input with sidechain monitor function. Operating level switchable from +4 dBu to -10 dBv. Servo-balanced, gold-plated XLR and 1/4″ TRS connectors. High-grade output transformer BEHRINGER OT-1 can be retrofitted.