Yamaha XDA-AMP5400RKBL, Multi-Room Amplifier (4 Zone, 8 Channel).

Yamaha Multi-Room Amplifier XDA-AMP5400RK Specially 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 configurations. Features 8ch Class D Amplifier (1U Rack Mountable) 50W Per Channel @ 8ohm 5hz to 40kHz Frequency Response 108db Signal-to-Noise Ratio Bridgeable 4-ohm Capable 4 x Audio I/O Buses 4 x 12V Trigger Ports 4 x Contact Closure Ports Expandable up to 32 Zones Music Streaming (Spotify, Tidal, Deezer, Internet Radio) High Resolution Audio Support AUX Input Cut In Input Remote In / Out Ground Loop / Hum Free Circuit Design Auto Standby / Audio Sense Mode 2 x Ethernet Ports Web Setup Includes Rack Moun