AmpliPi - A Raspberry Pi-based whole house audio amplifier (Crowdfunding) - CNX Software
XDA-QS5400RK MusicCast Multi-Room Streaming Amp - Yamaha USA
XMP300 150W Class D Stereo Amplifier | Whole House Audio
Dayton Audio - DAX88 8-Source 8-Zone Distributed Whole House Audio System Amplifier
Russound CA6.4i Whole House Audio Central Controller Six Zone Amplifier Amp | Reverb
AXR85 - FM/AM Stereo Receiver with Phono-Stage | Cambridge Audio US
Whole House Audio & Multi-Room Music Systems
Amazon.com: Pyle Wireless Bluetooth Home Stereo Amplifier - Multi-Channel 200 Watt Power Amplifier Home Audio Receiver System w/HDMI, Optical/Phono/Coaxial, FM Radio, USB/SD, AUX, RCA, Mic - Remote -PDA9HBU.5 : Home & Kitchen
WS66i (KIT-Package) Whole-Home Audio Distribution Network Controller M – Soundavo
How to power a multi-room music system
Arylic® - Best Wireless Home Stereo Amplifier, Preamp, DIY Audio Kits.
16-Channel 8-Zone Digital Home Theater Amplifier MX1680 | Outdoor Speaker Depot