Yamaha HTR-4066BL 5.1-Channel 575-Watt Audio/Video Receiver, Black 5-channel powerful surround sound 115 W per channel (8 ohms, 1 kHz, 0.9% THD, 1-ch driven) 80 W per channel (8 ohms, 20 Hz-20 kHz, 0.09% THD, 2-ch driven) HD Audio format decoding: Dolby TrueHD and DTS-HD Master Audio