Yamaha RX-V673 7.2-Channel Network AV Receiver (Discontinued by Manufacturer) 7-channel powerful surround supported in HD Audio format decoding: Dolby TrueHD and DTS-HD Master Audio; Dolby Digital Plus and DTS-HD High Resolution Audio Network recceiver with AirPlay, allows music streaming from Mac, PC, iPod, iPhone, iPad 4K Upscaling for next generation super high resolution displays, and HDMI (6 in/1 out) with 3D and Audio Return Channel AV Controller app for operating various functions from an iPod, iPhone, iPad or Android phones YPAO R.S.C. (Reflected Sound Control) sound optimization for automatic speaker setup