Onkyo M-5010 2-Channel Amplifier (Black) 75 W/Channel (8 Ohms, 1 kHz, 0.08% THD, 2 Channels Driven, FTC) Three-Stage Inverted Darlington Circuitry to Reduce Distortion Delivers Multi-Zone Audio with Selected Onkyo A/V Receivers. Damping Factor : 60 (Front, 1 kHz, 8 Ohms) Daisy-Chain with Additional M-5010s for Bi-Amping or Multi-Zone Audio Impedance Selector Switch (4-8 Ohms and 8-16 Ohms)