I have ripped all of my albums to 192 AAC. I am beginning to question if this was overkill for my purposes. (When I want best quality, I listen to the original on my stereo. I use the AAC files for iPod, computer speakers, and the occasional "party mix" that I throw on boomboxes at other peoples houses). Anyway, if I were to reduce the file size to 160, to help out my iPod battery, would I lose any quality BEYOND that which I would have lost in the first place? I mean, will they sound the same as if I ripped the CD to 160 in the first place? Or, since I am starting from a AAC file, even at a higher bit rate, will the compression come out worse? Am I making sense? Because, I'm not re-ripping everything! But, if the compression from 192 to 160 results in the same sound quality as a "freshly ripped" 160 file, I might go ahead and do that. Thanks.