Sony STR-DE685 Audio/Video Stereo Home Theater Receiver (Discontinued by Manufacturer) Stereo Mode - 100 watts per channel (2 channels), 8 ohms, 20 - 20,000 Hz, 0.09% THD Surround Mode - 100 watts per channel (5 channels), 8 ohms, 1,000 Hz, 0.7% THD 4 Ohm / 8 Ohm speaker switch 24-bit Dolby Digital, Dolby Pro Logic II and dts decoder Digital Signal Processing with 11 acoustic environments & 3 Digital Cinema sound modes