My iTunes sounds like crap

[Shacklebolt]

It's weird. It's too bassy and sounds horrible on my speakers and headphones. I know it's not a problem with either my speakers or headphones, because they both sound fine when plugged into just my stereo or cd player.

Any advise?

 

[Lacero]

Is Sound Check on? What about your Equalizer settings?

 

[mad jew]

Do QuickTime movies sound bad? Maybe open then close Garageband to reset core audio.