Both of my two front door speakers, and one of my four rear door speakers (one of the woofers), are not working. I removed the front speakers and connected them directly to a home stereo -- they work. So, I am thinking problem is not the speakers. Tried disconnecting/reconnecting/jiggling the electrical connectors at the amp, but nothing changed. I have the 10 speaker system (or is it 12?). The speakers on the dash and the subwoofers in the trunk are working fine. Also both rear door tweeters and one rear door woofer is working. Wondering if anyone has been here before, or if you have any good ideas on troubleshooting, that would save me from having to go through the whole system inch by inch? Any known history of the amp or radio units causing this sort of thing? Locations of cable junctions/connectors or relays, etc. which might be suspected in something like this? Thanks!

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2009 X5 3.0
2001 X5 4.4 - Sold