IGS Audio Volfram Limiter, Dual Mono-Limiter based on a 1176, FET Compressor BF245A, matched Transistors, two linkable channels, Wet/Dry Mix Knob for parallel Compression, 45dB Transistor Amp, stepped manipulators, Sidechain HPF: 240, 180, 120, 90, 60, Off, Attack: 0.1 - 1 ms, Release: 0.1 - 1,5 s, Frequency Range: 8 Hz - 22 kHz +/- 0.2dB, Input Impedance: 10k Ohms, Output Impedance: 600 Ohms, Bypass per Channel, VU-Meter per Channel, Housing: 19" 2HE