I had a 1990 E34 525i with a stock stereo and cd unit in the trunk. It sounded great.

I then got a 1993 E34 525i with no cd unit and it sounds pretty bad. no headroom and seems to distort and have a fuzzy sound just over half way.

I replaced the Head Unit with an Alpine CD player and it still sounds exactly the same. I can't figure out if its the speakers or the factory amp or what.
Anyone else run into this?? Any suggestions? thanks.

SKB