My 96 SL320 has the stock Bose sound system and the two bigger speakers in both doors are in-operative....mostly. From the wiring diagram it appears they are wired in parallel with the smaller ones which would indicate that it is not a problem with the amplifier. I've noticed that when playing a CD with a lot of bass, the 2 said speakers cut in and out, so they do in fact work to some degree. What's going on? Do they need to be replaced, or is it wiring? Pulling the door panels is not one of my favorite tasks because I know that half of the plastic clips will break in the process, so I want to do this only once!