This past summer I put a JVC 12disc CD Changer in my '89 SC. I have the stock premium sound Ford cassette/radio in my Bird. The CD Changer has to run through the radio for it to work. The music sounds very muffled like the sound is coming from a can. It worked fine for a couple months then this happened. I brought the old one back, to Best Buy, where they replaced it with a brand new one. The problem still remains. The techs at Best Buy are puzzled also. Has anyone else had this problem. It's very annoying when you want to crank it up. The radio/cassette works fine. Sounds great for a stock system. Thanks Rick