https://usa.yamaha.com/products/audio_visual/multi-room_amplifiers/xda-amp5400rk/index.html
XDA-AMP5400RK - Overview - Multi-Room Amplifiers - Home Audio - Products - Yamaha - United States
Specially designed for custom integration of whole home audio systems, the "AMP" serves as a companion amplifier for the Yamaha XDA-QS5400RK to expand speaker...
multi room