We are working with the BT chip manufacturer but most DX160s work fine, out to 20 to 30 feet, depending upon walls, people etc. We use Class 2 BT, which is rated at 33 feet but often doesn't get quite there. You could go and compare the one you have to another unit and see if you get better results.
Paul, I may be wrong, but I have seen some test data showing that if you use Bluetooth with LDAC 990 vs SBC, then you need a 15 to 20 db stronger signal to prevent drop out.
- So, If the "Class 2 BT @ 33 feet" is using SBC (Or ACC or LDAC 330), then anyone trying LDAC @ 990 for best quality should expect shorter range without dropouts.
- I get better bluetooth range from my phone than from any DAP I have. Don't have the DX160 yet, but with other DAPs, I can usually get 10-20 feet with LDAC 990, no walls. LDAC 660 is more stable a bit further.
- Another bluetooth "problem", with my other DAPs, is that the human body (water) can reduce a bluetooth signal. If I have DAP in my back pocket, and bluetooth receiver (Like ES100) in front shirt pocket, I will get some drop out with LDAC 990. Signal reduction going through me. (160lbs 5'10")
- If the bluetooth from any DAP can't keep a stable connection @ 3-6 foot away, (even with Best quality LDAC), that would seem like a problem to me. (Design? Mfr? Firmware?)
REF: See "Bluetooth CODEC Connection Quality" graph near bottom of this linked article.
https://www.soundguys.com/ldac-ultimate-bluetooth-guide-20026/
Note, I have ZERO expertise in bluetooth or electronics... Just interpreting what I read.