The WiiM Amp is a stream-everything receiver with Mac Mini vibes - The Verge
Sonos AMP with more power and options - MusicMultiroom
Amp: The Wireless Streaming Speaker Amplifier | Sonos
Amazon.com: BobWire DAT1 Adds a 12V Trigger! Compatible with SONOS Connect, Echo Link, ChromeCast Audio, TV, Anything with an Optical Audio Out. Auto Power On Amplifiers & Fans. NOT Compatible with AV
Sonos Amp Amplified streaming music system for passive home speakers at Crutchfield