I have noticed yesterday that my rear door speakers don't work on both sides.I think that are the bass speakers.What could be the problem? I have Bowers and Wilkins system. I don't know if it's 1200w.The car is a 2010 Portfolio. I have read that the car should have 20 speakers.Foolish question probably . I've count them and there are only 13..where are the rest? ) Does anyone has a clue what should I investigate for the speakers problem. Cheers

 

If both rear door bass speakers have stopped working at the same time I would be suspecting a problemw with the amplifier, or perhaps wiring. Unless somehow you managed to have two speakers fail at the same time...

The surround speakers and the rear door midrange are coaxial, combined midrange and tweeter, so they are counted as two speakers in the one assembly.

Here is what the speakers look like, you can see the dual cone ones.