All bluetooth is compressed with a variety of algorithms. Some are better than others, but none are lossless (not even aptX-HD). I believe Apple is about to rel

All bluetooth is compressed with a variety of algorithms. Some are better than others, but none are lossless (not even aptX-HD). I believe Apple is about to release a firmware update that they claim will allow some of their cans and buds to support ALAC, which is lossless, IF you have Bluetooth 5 devices, and only use it short range. My guess is that it will dynamically degrade down to AAC-256 if the devices are too far apart. Bluetooth 4 devices cannot support lossless simply because they do not have sufficient bandwidth.