Q about BT audio, and hopefully someone here will know.

I'm using the Quad 4K AC3 SPDIF optical output into an Elegiant BTI-066 BT transmitter. This is BT5. 0 and has AAC, SBC, APTX HD and LL codecs.
https://www.elegiants.com/ELEGIANT-B...-p-187466.html

I have recently got 2 Tribit XSound Go which are paired to provide stereo. They are also BT 5.0 but only SBC codec. The Elegiant is in SBC mode. The Quad is in AC3 Downmix for HD TV and all the other audio options are downmix. I'm currently on 5.4.016, but will update to the latest.

The stereo sound hasn't been as good as I expected after using an earlier non stereo XSound Go and is breaking up. Picture/audio sync is fine. It affects both live SD or HD TV and recordings.
Turning off 1 speaker back to mono, and the quality is good.

With the Go's linked to my phone/tablet BT the stereo is fine.

Before getting the Elegiant, I did try a Broadcom USB BT dongle in 2020, but I had to reset the Quad box each time to use the BT audio.

So, I'm searching for where the issue is - Elegiant or Quad 4K.

Any pointers gratefully received.