Which Bluetooth would be best

[sonic88]

Hi,

I'm looking for a Bluetooth dongle which will be working out of the box with OAP and will have best possible sound quality

I'm looking into following list:
 - UGREEN Adapter USB Bluetooth Qualcomm AptX A2DP
   https://allegro.pl/oferta/ugreen-adapter...0526871224
 - Bluetooth 5.0 Baseus BA04
   https://allegro.pl/oferta/baseus-adapter...1624549961
 - UGREEN CM390 Bluetooth 5.0
   https://allegro.pl/oferta/ugreen-adapter...1140580455
 - UGREEN CM408 Bluetooth 5.0
   https://allegro.pl/oferta/ugreen-adapter...0533014239

I think first Ugreen with aptx would be the best but I want to get your opinion.

Thanks!

[Daniel_BlueWave]

We have tested with BT from here: https://bluewavestudio.io/community/forum-105.html
No experience with other you mentioned.

[sonic88]

Generally I was inspired by this two threads
https://bluewavestudio.io/community/thre...l#pid12406
https://bluewavestudio.io/community/thre...tx#pid6244

So just wanted to check if other people have some experience with various BT adapters which supports aptX.
And hopefully this there could be helpful for other people who will be just starting with their OAP projects.

[xnick]

Just for reference to future readers, i have used the following 2 adapters.

Ugreen CM109 USB Bluetooth 4.0 Adapter
This one seems to work just fine. I have some audio issues (popping/pausing) which may be caused by something else though. Beyond that, all connections seem to work just fine.

I also tested this one.

Ugreen CM390 USB Bluetooth 5.0 Adapter
Just for start, its firmware (rtl8761b) is not included in the release, but that's easy enough to fix, by copying and pasting the files from another pc that has them. After doing that, you can connect with it, but it might take a few tries, and I've never been able to connect through OAP, only through raspbian's bluetooth manager. So probably avoid this one.