Lately I was trying to find a solution to use bluetooth earphones with Roon and I finally found a hardware solution that seems to work quite well.
The earphones I am using are the Beats X wireless andI wanted to make it work with a raspberry pi.
Without any additional hardware, I was able to pair the earphones with the pi. But unfortunately they were not detected by Roon (I guess RoonBridge is just scanning for directly connected and internal DACs). I also learned that Linux won’t support the aptx protocol… So even if I could make the earphones discoverable by Roon, audio would probably not great.
I then searched for some kind of adapters that could act as a bridge. I found some bluetooth audio transmitters and ordered one by avantree (Avantree Oasis). In theory you should be able to connect an audio source with a minijack and it transmits it (with aptx) to the earphones.
When I tried it, I was able to pair the earphones, but when playing audio, I heard more silence than actual audio. So I returned the device. Also the volume could not be set by the volume buttons on the earphones.
I found another interesting adapter. It was the BTD-500 by sennheiser. This USB dongle acts as an audio device over USB and also transmits the audio to a bluetooth audio player.
With this device everything seems to work. The pi detected it and it could be enabled as an output in Roon. It also connects to my earphones. I could listen to my music library without any dropouts so far and also the volume buttons of the earphones can be used to set the volume. The only odd thing is, that Roon only lists 48 kHz as supported.
Because of that I enabled a Sample Rate Conversion (for compatibility Only) and despite the warning in the screenshot, I had no issues so far.
This setup is not intended as a High-End wireless music player. I will mainly use it to listen to audiobooks when I go to bed and I am quite happy now with the result.
PS: I was also looking in using an Android OS on a Cubox which also worked. But I did not want to connect a display for the RoonBridge (or that case RoonRemote). I also did not want to get a cheap Android tablet (which could also be used for Bluetooth audio), because I have no other android devices and did not want to invest in a new OS architecture and another App Store (Google Play).