i recently was tinkering around with the EQ of itunes and i turned the bass up a little too high with the earphones in so i started to hear a crackle so i took the headphones out pretty pist because they were 50$ headphones but then I played the song again and the speakers in my macbook pro were crackling too so i put my headphones in my iphone and they were not crackling. i reinstalled itunes went and updated to 10.5.6 and updated itunes also but still a crackle. ive replaced the song with a new one off the internet with no luck it happens with all of my songs it happens with ones without bass too. I re-synced my iphone and still no crackle there. Im stuck and really like to listen to music through my computer. HELP!!!