DISCLAIMER: These measurements DO NOT account for wood thickness!!!!!
These measurements were tested with a template that I have made to include the seat up, the seat folding down and while down.
My goal for this thread was to get solid numbers out for anyone to use and I feel I have done that.
If someone would like to, please take these measurements and transcribe onto cardboard and double check me....can't ever be to sure!
The one and only thing that is not mentioned here is the seat brace which if you were going to build a box all the way across at a 7" bottom depth, you would have to build around. Using these numbers though, you could easily build a sub box with a sub on each side and the amp rack in the middle avoiding the brace!
Top Depth - 3 5/8"
Bottom Depth - 7"
Back - 18.1/2" Split into 6 1/8 above brace, 2 5/8 in front of brace and 9 3/4 below brace
Width - Total 48 3/4 Speaker box - 29 3/4, Amp rack - 19"
Now, I am using Kicker CompC8's that have a 4 11/16 mounting depth which I have plenty of room with the subs center mounted at 5" from the bottom. Honestly, I think there is close to another inch of mounting depth clearance at that height.
Another factor, my subs have a 1/2" mount surface and there is PLENTY of room for the seats to fold and the subs to play...no concerns at all. I really wish I would have taken a photo to show the template behind the seat folded up and down.
Lastly, someone grab some cardboard and an Exacto and test my numbers. I would love to know if I need to correct this.
Speakers Adapter Templates