USB can transmit lossless audio data perfectly. In practice, various sources sound different, and sound from a PC can range from OK to superb. I have heard hypothesis after hypothesis as to why this is, but I think no one knows for sure, by which I mean no one has done a study that would withstand peer review. People have impressions. Perhaps it is noise transmitted on the ground to the DAC.
aptX HD will NOT transmit lossless audio data perfectly. Whether it will sound better or worse than the PC in your system, to your ears, is impossible to predict. All you can do is try it. Last time I did, I thought it was pretty good. But it is not lossless.
aptX HD will NOT transmit lossless audio data perfectly. Whether it will sound better or worse than the PC in your system, to your ears, is impossible to predict. All you can do is try it. Last time I did, I thought it was pretty good. But it is not lossless.