i've recently noticed that playing music on my macbook has started to sound muffled. at first if figured it was the speakers i was plugging into but then i tried them with my ipod, and no issues there. so then i figured it might be the port where i plug my speakers in but i also notice the distortion when i have nothing plugged in and am just playing music from my computer directly. i guess i should take it in but i'm a little concerned they'll give me a hard time since i upgraded my own hard drive and such...i want to get a good idea of what might be causing the issue before i decided to give the genius bar a go. any thoughts? suggestions?