Loud hiss with TRN V80, V20. Not so loud hiss with V90. Disappointed.
Great Bluetooth adapter with a noble idea of having replaceable cable arms for different connectors. I would advise caution with using these with MMCX IEMs, as the build of the MMCX arms may not stand up to changing between different IEMs especially if the connection is tight. No such concerns with any 2-pin connected IEMs, which are far less susceptible to this issue. They have a great stand-by battery time and an admirable play time too, and while sound quality may not be APTX-HD, the clarity of material barely suffers from this if you aren’t concerned with obsessively audiophile bitrate.