I have been on the lookout for a way of playing music in our bathroom without a huge installation but with a lot of flexibility. Thanks to a recommendation by XY I bought a Dayton DTA-1 amplifier and a Raspberry Pi.
I installed Raspbian following this tutorial. The bluetooth adapter worked like a charm.
Getting AirPort to work required some tinkering using this tutorial.
The Dayton is really good at playing back the MP3s. The sound quality for 33€ is very good and the case small and light. I did not choose to add a USB DAC as I can’t hear the difference.
Next step: getting it to be controlled with KNX…