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Each speaker has it's own amp. Generally, the capacitors fail. Bose will repair for about $100 each.
I own the 1989Cadillac 4dr Sedan Deville with Bose premium sound. Each speaker has its own individual amp that is attached to the speaker. The amps in my car went bad causing only one of my speakers to work. If you are having issues with the amp from my experience it is better to run new speakers, stereo, and wires (but be warned it is no easy task to remove the old door speakers!).
if its a Bose system then you have to hook up the wiring harness in the trunk of the car and run all the wires all the way to the front..its about 9-10 wires...there is an Amp in the trunk of the car on the right side right next to the antenna motor...
body feed fuse 20 amp
the amp is in the rear passenger door if you have a Bose system
Any metal part of the body should work fine for a ground
Underneathe the rear deck/dash, in the trunk. Sometimes you can find replacement units in Toronados, Grand Prixs, Luminas, Regals, and Cutlasses.
Where is factory stereo amp located on a 2007 Cadillac cts
Under your center console.
There are 4 amps, one on each speaker, the speaker is in an enclosure with the amp built into it.
amp is located above the gas pedals to the left behind insulation
The external amp is located just behind and slightly lower than the head unit.