Quote:
Originally Posted by Technic
Bluetooth Audio has lower audio quality than USB by design.
You may or may not notice the difference depending on how compressed is your music.
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That's somewhat misleading but likely true in practice. Playing with a USB drive plugged in, the sort of quality bottleneck is the compression you're using. Low bit rate MP3 will be worse than high, or VBR, or most AAC, etc.
Bluetooth sounds crappy because the only codec required by the A2DP standard is SBC, which is just awful quality/bitrate. You CAN use AAC (assuming source and sync both support it), shifting the bottleneck to the compression of the file itself (not really, but you're somewhere around matching the file compression quality in most cases.)
The problem is, SBC comes for free rather than $15k up front plus a dollar per unit like AAC, so very very few devices implement AAC.