I just bought a pair of Shure SE210 headphones, and they sound very good. After listening to them for a while on my Macbook, I plugged them into a PC with a Sound Blaster Live! 5.1 sound card and immediately noticed a HUGE difference in sound quality, especially with the lower frequencies. It really gave me a whole new perspective on the quality of these earphones The question is, is there anything I can change on my mac to improve the sound quality? I've tried adjusting the equalizer in iTunes, but it seems to make little difference. any suggestions?