Sony STR-DA5800ES Specs: Home Theater Receiver, 130 Watt - 8 Ohm - 20 - 20000 Hz - THD0.09 % - 9 channel(s) (Surround), 140 Watt - 8 Ohm - THD0.7 % - 9 channel(s) (Surround), 130 Watt - 4 Ohm - THD0.15 % - 9 channel(s) (Surround), 130 Watt - 4 Ohm - THD0.7 % - 9 channel(s) (Surround), Ethernet, Smartphone remote controlled, Bi-Amplifying, Control4 automation technology, A/B/A+B speaker switch, Three-zone capability, Sound Optimizer, Source direct, 4-ohm/8-ohm switch, On-screen display, Audio Return Channel (ARC), iPod/iPhone ready, Compressed music enhancer, x.v.Color, Digital Cinema Auto Calibration (D.C.A.C), Upgradeable firmware, BRAVIA Sync