Cool thanks, I *think* I know what you mean by the flat bar and 1" inset baffle.

So this should work then. Will there be any type of port noise or is the "chamber" and the opening through the seat large enough that that won't happen? In the rear seat attached to the pass-through there is a fold down armrest for the rear seat occupants.

I was planning to try and keep it so that the armrest would remain for the rear seat occupants and removed the rest of the passthrough and cover it in grill-cloth so it just looks like the rear seat armrest is folded down for use, not the whole passthrough.

This would be much more stealthy installwise and comfortable for rear seat occupants (I often have 2 passengers). This way would allow for an opening through the rear seat of about 12" tall by 8" or so wide vs. the 9" by 15" of removing the armrest and passthrough all together. Would this restric the air movement from trunk to passenger compartment too much?

Another question about plexi... would the front face of my box be too big to make with plexi, so that from the trunk you can look into the box and see the front of the woofers? How much does that type of material usually cost and what should I look for? I've never used plexi before in a box design.

Thanks