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Originally Posted by meyerweb
I can hear the difference, even on a portable CD player if I listen carefully. Definitely on my home audio system. But then I don't really listen to many mp3s on my home system.
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If you go from AAC (protected) at 128 to MP3 at 128, you'll surely hear the difference. I just burn to CD, and re-rip as high quality AAC (removing the copy protection), and I really can't tell.
As a matter of interest, I just used Audio Hijack Pro to capture a protected, and unprotected version of the same song, brought it into an audio editing app, reversed the phase, and copied one over the other. A duplicate version of the song, would result in a silent file. It was nearly silent, you could hear some of the song, so you're right, there is a difference between the two files, but it was hardly anything at all.
Every time I've stayed as AAC 128 files, I really can't tell myself, but then again, years of standing next to a drummer have probably taken their toll...
George