My entire system is after market except for speaker wiring. For the front speakers, I tapped into the Bose speaker wires at the trunk where the Bose amp was installed. Everything works well, but the front door speakers and a-pillar tweeters are connected in parallel (to the same leads at the trunk.

Anyways, I want to setup a passive crossover and I was wondering if anybody knows where the wires split for the door speakers and tweeters. Thanks.