Featuresr adopt high performance linux operating system and audio decoder chip support dtsac 3r one key switch for 51 or 21 channel output 2 spdif optical input 1 coaxial input 1 stereo inputr aux input port connect to any group of lpcm stereo signals such as computer audio mp3mp4 player audior high compatibility support network player hdtv blu ray dvd dvd for ps3 for xbox 360 dm500s dm800hd etcr support playback with u disk automatically identify u disk to p