Denon AVR-687 7.1-Channel Home Theater Receiver (Discontinued by Manufacturer) 7.1-channel home theater receiver with 525 watts of total power; meaxures 17.1 x 5.8 x 16.1 inches (WxHxD) 75 watts at 8 ohms across seven amplifier channels Auto Setup feature precisely balances speaker levels and fine-tunes the delay settings (microphone included) XM Radio ready and XM-HD surround sound capable; control iPod via optional dock Surround modes: DTS 96/24 decoding for DVD video; DTS-ES 6.1 and Matrix 6.1; DTS NEO:6; Dolby Digital EX; Dolby Pro Logic IIx; Neural Surround