Songs played through iTunes are horrible quality, but are perfectly clear on any other program

I recently imported my music into iTunes and every song now plays with horrible quality. It fades back and forth between ears, is very distorted at low volumes, and sounds very "pixilated." I'm afraid to sync my phone and have my clear music replaced with this. I've turned off all filters in iTunes and got a slightly noticeable change, but very slight. Its bad enough to where I'd rather sit/drive silence. How did Apple manage to do this to iTunes?

I started a thread a couple days ago and I thought I fixed it by reseting PRAM and SMC but I opened the song in VLC and Quicktime. As soon as i play it through iTunes its extremely distorted again! If it plays fine through Quicktime then it has to be an iTunes problem.