Inputs (2):Line level (-10 dBV nominal unbalanced), Left and RightInput Impedance:10 kΩ unbalancedGain Adjustments (2):Single turn, one per channelMinimum Input Levels:-18 dBV (to cross compressor threshold)Maximum Input Levels:+15 dBVFrequency Response:20 Hz to 20 kHz (+/- 1 dB, 4 or 8 Ohms)*THD+N:< 0.1% (1 kHz, 1 W, 4 or 8 Ohms); < 1% (50 Hz to 20 kHz, 8 Ohms)* *measured at compressor threshold level equaling 12 W RMS (8 Ohms) output powerCompressor:Threshold nominally 2 dB below rated output, automatically adjusting attack and release timesCrosstalk:Better than 60 dB (1 kHz, no compression)Noise:< -75 dB (below 20 W RMS)Selectors:Slide switches: Output Impedance 4 Ohms or 8 Ohms; Input Mode SUMMED MONO or STEREOOutput Power:20 W RMS into 8 Ω per channel, 40 W RMS total; 15 W RMS into 4 Ω per channel, 30 W RMS totalOutput Circuit:Class DAmbient Operating Environment:0?? C to 40?? C Maximum; 20?? C RecommendedIndicators (2):Red LED: THRESHOLD LED indicates compressor activity Blue LED: POWER onPower Requirement (Supply Included):Input: 100 to 240 VAC, 50 to 60 Hz, 1.5 A, IEC C14; Output to module: 24 Vdc