There is a pair of MP3 player sunglasses from THUMP (see it at thumpinfo.com) where i have heard that some users of these awesome shades re-rip their mp3's at higher rates because they don't sound the same (Oakley THUMP utilizes the entire 20kHz human hearing range). I, however, play my music through my computer using standard Media Player 10 on a 200 watt surround sound system, and i don't notice a difference. My friend, who i just burned a CD for (from 128bit compression) doesn't notice a difference on his BOSE system.