Rockruepel comp.two compressor, 2 channel tube compressor, hand-built, all-tube, variable-mu stereo/dual mono, 3 low cut sidechain settings, Input Gain: -00 - +17 dB non stepped, Output Gain: -00 - +17 dB non stepped: Threshold x non stepped, Attack stepped, Release stepped, Input Impedance: ~17 KOhms Output Impedance: ~600 Ohms, Tubes: 2x 6n3 - 2x6cg7, Sidechain EQ6 dB/oct 54Hz, 74Hz, 110Hz, Amp Only mode, Dual Mono and Link Mode, dimensions: 19" 3U - 270mm depth, weight: 8kg, made in Germany