no aptx. i asked many aliexpress sellers. its a realtek chip, not a qualcomm one. so no aptx for sure. aac dont know.Who's gonna take the leap? I haven't had the best experience with truly wireless bluetooth myself but maybe the source will make a difference this time. Recently got the Samsung Note 9. So, I saw that it the BT20 is bluetooth 5.0 and wonder if it includes APTX?
but maybe if you have some know how of android modding, you could get SBC bitrate mode working
SBC specifications allow higher bitrate than currently used by manufacturers(mostly 384kbit max). like up to 512kbit. so even if SBC 384kbit sounds like 192kbit AAC, with 512kbit its like ~ 33% more bitrate which should be audible improvement
https://forum.xda-developers.com/android/software-hacking/improve-bluetooth-audio-quality-t3832615
and in the case of the TRN BT20: bluetooth 5.0 has now support for 1MBit/s , so maybe you could go even higher with the SBC bitrate. some people have reported that they got 617-660 kbit/s working (and that with <5.0)
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