There obviously are some issues with Bluetooth.
For starters, it uses the crowded 2.4 GHz band, which can get you interference or drop-outs caused by other devices in your house, or maybe even your neighbor’s house, if it’s close enough to you. Check the negative reviews of any Bluetooth device on the market and you’ll find that most of them are complaining about spotty reliability.
Another issue with many, if not most, Bluetooth devices is a dearth of published audiophile specifications, like frequency response, S/N ratio, or THD. Fortunately, the aptX codec can largely placate the dearth of audio specifications.
Another potential red flag is that Bluetooth is a digital platform. This means a receiver also does digital to analog conversion. As you can see from the link you provided in the first post, many of these things are dirt cheap. What kind of D/A conversion can you expect with something like that???
There are a few devices you might look into that should be worthwhile, if you’re interested in something that might be considered hi-fi.
The Avantee Oasis seems to be better in the reliability department than many lower-priced products, but they don’t publish any specs.
The Outlaw Audio OAW4 only publishes partial specs , but assures "Full CD sound quality." There are four channel selections, but no user reviews to be found.
The DN200BR from Denon Professional publishes specs and has a great feature, offering 25 channel options, which should get a better chance of interference-free operation. However, Amazon reviews are spotty, although it should be noted that the issues may be with the reviewers’ transmitting devices.
The “Rolls Royce” of Bluetooth receivers might be the Audioengine B1. Published specs exceed the Denon, but no indication is given as to the number of channel selections that may be dialed in. Still, given its stunning 90% rating for 5 and 4 star reviews at Amazon (40-60% is more common for Bluetooth devices), it may have an automatic channel selection feature.
Regards,
Wayne A. Pflughaupt