Description: For good audio and video processing of 5.1 channel surround sound, Pioneer offers the VSX-821K 5.1 Channel A/V Receiver. This receiver is fully compatible with 1080p source materials and supports 3D content as well as an Audio Return Channel (ARC), Deep Color and xv Color. It also supports a host of advanced audio formats from Dolby and DTS including Dolby TrueHD, DTS-HD Master Audio and Dolby Pro Logic IIz for an added height channel.