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The bottom of my sub boxs are 10.05" front-to-back and they are about even with the front edge. I say "about even" because the edge of the shelf is rounded and covered in 1/3" of carpet and padding, so it is a bit hard to define.
You can get 4-10lb bottles of nitrous back there with all 4 hooked up to one block feeding one main line and a pressure gauge. May not sound as good as the "woofers" but this thing ROCKS!