The AVR-591 is packed with exciting features that lets you experience superb surround sound. It's also equipped with the HDMI 1.4a technology, which for the first time provides for 3D pass-through capability, delivering thrilling 3D high definition viewing with 3D-compatible HDTVs. With 4 HDMI inputs, the AVR-591 also features upconversion of standard definition signals to HDMI output, allowing a single cable run to the TV, minimizing costs and reducing system complexity. Equipped with the high resolution audio decoders, including Dolby TrueHD and DTS-HD master audio, the AVR-591 also features Dolby Pro Logic IIz decoding, which provides front channel height channels for a dramatically big front soundstage. The 7 channel amplifier section features discrete component technology. The remote control features codes to control a wide variety of other components, and the AVR-591 even provides an easy-to-use on-screen remote control setup guide.