I really wish someone would come out with a $25 "box" that sits on top of my bookshelf speaker that allows me to Airplay to it and power said speaker with a ~50w class-D amp. Then if I have multiple ones, it would allow them to pair and setup stereo or surround sound. I might even pay $50 for it. Kinda like a Sonos Amp but not at that price point.
Does https://sonocotta.com/louder-esp32/ look like something you might be looking for?
I'm thinking about getting an Audiocast M5[0]. It seems to do exactly that. The price seems to be around US$ 30.
[0] - https://audiocast.io/
After reading this comment I also wanted the same thing and found this https://www.up2stream.net/products/up2stream-mini-receiver-b...
Squeezelite-ESP32 is a solution that is sort of aligned with this scenario. No airplay and you would need an amp module to get to 50w.
I went with iPod Hi-Fi + AirPort Express connected via mini toslink to mini toslink cable.
Whats the justification for Sonos Amp being 31 times the price you're willing to spend? Niche problem or is the tech inside it worth that?
WiiM makes a few. With or without amp. It can be had for about ~40 refurbished from what I suspect to be their eBay store.
Airplay 2. I have it hooked via optical to a soundbar.