separation of deck speakers and subs

Why do you want to flush mount the drivers? Be sure to flush mount all of the drivers. Not doing so will cause small spikes in the frequency response produced directly in front of the speaker. For that matter, any protrusions on the surface of the speaker box can produce these spikes in frequency response. There are two ways to flush mount a speaker. The first is to use a router and cut a groove around the outside of the driver hole that is as deep as the driver edge. The simpler method is to add another piece of wood of the right thickness with holes for the drivers directly over the baffle. Be sure to do this correctly. If the front of the driver is not flush with the baffle, then all this work is wasted.

It's not.

Ok thanks.

I'm going to try to enclose some of the area under the rear deck. Trying to get about 1 cubic foot for each speaker. Also going to make some sort of provision to place a port into the cabin if needed.

As for the 6.5" speakers I placed in the factory 8" sub location it was easy enough to open the door panel into the door cavity. Haven't got as far as i hoped at this point, had to do some clean up after the tornados came threw and with the unseasonably warm weather got a little sidetracked a few evenings. Looking forward to getting this done as this is my first major audio project. Hoping for a big improvement over the factory shaker 500. If there is any interest when i get a little closer to being done Ill start a thread in the appropriate section and post some pictures with some comments.