I found this site today and it looks like a lot of people around here know quite a bit about audio! Hopefully I can get some help / opinions here as I am about to design & build a new box for my car.

I have 2 Infinity 1230ws (4ohm) which I have to build a box for. This is going to be going into my own car, a 2000 Subaru Legacy. This vehicle does not have a fold down rear seat, just a "pass-through" centre armrest in the rear bench.

First things first, I'm planning on building a sealed box, 2.5 ft^3 as recommended by Infinity. My aim is more towards sq than spl.

As opposed to firing the subs to the rear of the car as they are traditionally done I thought of a way (or I think I did) to get all of the sound into the passenger compartment of the car.

My idea is to fire the woofers towards the back seat and force all of the pressure from the subs into the cabin through the lowered pass-through in the bench (I would always have this down except for the rare occasion in which I carry 4 passengers with me)

I would accomplish this by building a standard sealed enclosure and pointing it towards the seats, but build sort of an additional enclosure infront of the woofers which "contains" the bass except for a hole the size of the armrest, which would allow the sound pressure to travel into the cabin. This would be similar to a bandpass design except with a bigger airspace and a larger opening which is not a port.

Has anyone ever done anything like this before or have they seen it done? Is it even worth exploring? If not I guess I'll do the tradtional sealed and point backwards. I'll try to work out an actual design this evening and post it up so you can have a better idea of what I'm talking about.

Hopefully this is an acceptable first post, thanks in advance for any help.