My brother did some listening tests with AAC at different bit rates. He found that AAC at 192 kbps was indistinguishable from AIFF with his setup, but that 128 kbps (which ITMS uses) was noticeably worse, though better than MP3. As a result, I don’t think I’m going to bother re-ripping my 224 kbps MP3s … Continue reading AAC