Deny556

Hi guys. The left back speaker and left back subwoofer doesnt work any more. I removed the door panel and checked the speaker with voltmeter but speaker is ok. I replaced the speaker from the other door but fault remains. So, its not the speakers who are faulty, simply the left back chanel doesnt work.
So it remains amplifier or door module from whom the speaker wires are conected. Any thought how can i check these?
Even, is there anything other that can cause this fault?
Thank in advance...