I ordered a wiring harness which should help with the power aspect. What I'm wondering is, how do you wire the 6 speakers into the 4 channels that most radios come with? Each speaker gets a channel, so do I need 6 channels to do this or is there a cross over of some sort in the car?

 

I think that the tweeters and the front speakers are kinda spliced together, but I don't know if the tweeters have a highpass filter or something.

I would think that this is irrelevant though - if you're replacing your speakers, just attach them to the existing wires. If you're replacing the head unit, just attach the harness that's all ready. Unless you want to rewire the whole car, it doesn't matter.

 

Well the front midbass and tweeter are wired together with some sort of inline crossover. So just wire it like a normal set up FR, FL, RR,RL. If your replacing the midbass and tweeter than you would need to run new wire to the front doors due to the inline crossover.

 

What if you were replacing the existing midbass and tweeter with another midbass and tweeter - couldn't you use the existing wiring and crossover then?

 

not entirely sure but be carefull most head units are only good for a 4ohm load of you have two 4ohm speakes wire togeather your load is 2ohms and will push your head unit a lot harder. If might not be able to handle it. if could actually blow the speakers also. When an amp is rated at 40 watts @ 4 ohms and you wire it to 2 ohms it is now pushed to 80 watts.