WDPTLS

i am in the process of installing all new door speakers, components in the front and coax's in the rear with a 4 channel amp. i also have an aftermarket HU. i want to know if there is a way i can use the factory speaker wires and tap somewhere into the factory amp leads to take the signal for the door speakers. i have rcas running from the front into the trunk for the 4 channel amp. i need to know where i can tap into from the 4 channel to the door speakers using factory leads. thanks, i need this asap my car is all ripped apart already.

Madnesss

either return your amp and get an alpine ktp-445 (which is what i have and works great!, mounts easily behind the aftermarket HU no need to run amp wires to your trunk, super easy install) or.....
take the speaker wires from the factory harness and attach speaker wire, run them to where ever you installed the amp. attach these wires to the speaker outputs on the amp. if you do this correct, your door speakers should work. (assuming you already have the rca, remote, power and ground already hooked up to the amp correctly)
you cant use the factory amp to power the door speakers, that amp is only powering the factory bose subwoofer. hope this helps...

WDPTLS

thanks madnesss, i ended up basically doing what you said. ran new speaker wire from the head amp to the new radio harness and everything works properly. sounds amazing, the amp that i have works awesome with the Morel speakers i put it, i couldnt ask for more. thanks again.