Yamaha XDA-AMP5400 MusicCast 4 Zone-8 Channel Integrated MusicCast AmpSpecially designed for custom integration of whole home audio systems, the "QS" (Quad Streamer) provides four zones of audio streaming and eight channels of high performance audio amplification in an ultra slim, 1U high, rack mountable enclosure. Expandable and extremely flexible, the QS works with the MusicCast multi room audio system, allowing it to be linked with home theater AV receivers, sound bars and Hi Fi gear in a wide variety of