in

How to Build a Raspberry Pi-Powered Multi-Room Audio System

Multi-room audio systems can cost a pretty penny, with Sono’s two-speaker system starting at $379. But who needs to buy an expensive set of wireless speakers when you can use some Raspberry Pis and any 3.5mm wired speakers you have handy to achieve the same effect?

In this tutorial, we will use our Raspberry Pi 4s and speakers / receivers (with 3.5mm audio inputs) to play music from our favorite streaming service perfectly in sync via Bluetooth from our phone, tablet, or computer. We’ll show you how to do this with a single speaker and Raspberry Pi and then explain how to replicate it in additional rooms.

Reference