Yamaha 4 Zone 8 Chanel MusicCast Multiroom Audio System Quad Streaming Amplifier XDA-QS5400RK MUSICCAST MULTI-ROOM STREAMINGAMPLIFIER (4 ZONE, 8 CHANNEL) Specially designed for custom integration of whole home audio systems, the “QS” (Quad Streamer) providesfour 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 ina wide variety of configurations. - Designed for custom integration of a MusicCast multi-room audio system connected via Ethernet LAN in a rackor cabinet - Streams four zones of audio per unit, expandable to 32 zones with simultaneous playback in linked groups of up to 20 zones each - Eight channels of audiophile-grade Class D amplificationassignable to any zone, bridgeable and 4-ohm capable, featuring a unique ground loop/hum-free circuit design - Built-in Spotify Connect, TIDAL, Deezer and Net Radio music streaming services, plus access to music libraries andlinked external sources - Easy control via a free MusicCast app and 3rd-party control systems1U high, rack-wide enclosure; removable rack ears and faceplate included