W140 BOSE amp
As an owner of a 92 500SEL who replaced the entire audio system, I strongly urge you to only have a qualified audio technician like LaJolla Audio work on your car. I live in the bay area and I have yet to find a technician that truly knows how the system operates. As a result, I wasted $7000 on an entire new audio system and the improvemnt is definitely there, but certainly not 7K worth. I loved the original system, just wanted a bit more power out of it.
Joel P. Davis