Thanks Rick! The sound was so bad that I worried I just had a bad set, but looks like that's just the way they come.

I'm thinking a new deck is probably the way to go.
On a (possibly) interesting side note... I didn't even realize the car had the disc changer until the 2nd day I had it-- the dealer who sold it to me didn't kinow it was there either. I was cleaning out the trunk, and happened upon it, and was really surprised to find it back there. It was really kind of a cool find. I hate to pull it out, but I guess a new deck warrants a new disc changer too.