for those of you who have external 4 channel amps powering your speakers, how are you using the two front channels to wire the 4 inch speakers in the dash and the 6.5s in the door? i have a JL 300/4 under my drivers seat. can you loop wire from the doors back up to the dash or are you just leaving them disconnected? my JLs in the door have a external crossover but both high and mid slots are wired to that speaker. it has no external tweeter. never messed much with car audio like this before so im curious as to how this would work.