Okay...for those of you that read my "Problem with old Sony Reciever" thread...I got that one working. But now I've got another problem. The speakers that I'm working with are Polk RTA 8TL from the late 80s. I noticed that one of the speakers sounds muffled. There isn't a hiss or anything...it just sounds muffuled, like if someone was holding a pillow over the front of the speaker or something. Is this problem fixable...or should I just tell my parents to get new speakers? Thx.