Yamaha RX-V373 5.1-Channel AV Receiver - (Discontinued by Manufacturer) 5-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 HD Audio format decoding: Dolby TrueHD and DTS-HD Master Audio; Dolby Digital Plus and DTS-HD High Resolution Audio 4K pass-through for next generation super high resolution displays, and HDMI (4 in/1 out) with 3D and Audio Return Channel Front panel USB Digital Connection for iPod and iPhone YPAO sound optimization for automatic speaker setup