Here's a start. I like the idea of using the "shorter" box because I want to be able to close up the lid and use the trunk without worring about the speaker. The volume can be increased by adding a fiberglass bottom formed to the trunk. MrKln has written tips on how to do that. Maybe you can find it in the archives, I couldn't find this post anymore.
Here are some dimensions I came up with for a sub box that will fit into the large storage area in the trunk. It can be made with a little more than a 2 foot x 4 foot single sheet of MDF board. Don't use particle board like what's in the pictures, I didn't know any better and it does take better pictures. It's about $19.00 at Home Depot. You can also use Birch, (mrkln) it's lighter than the MDF board.
You can easily adjust the height. The box will fit exactly flush with the floor level of the trunk if the 6 1/2" dimension and the 1 3/8" dimension is increased by 1". If the 6 1/2" and 1 3/8" dimensions are used the box will fit under the cover with the lid on. You'll have to be aware of speaker height. If the carpeting is removed it will sit low enough to fit under the storage lid using the taller dimensions. I did have to put a couple of cuts into the bottom corners of the carpet in the storage area.
These are the dimensions I used for the shorter box. I made the box 21 1/2" long.
Here are the first cuts. I cut off a 7 1/2" piece of the 24" x 48" sheet and laid out the ends. Use a 6 1/2" piece and lay out with 1 3/8" dimension for a shorter box.
End pieces finished. These are for a taller box.
Cut off a 9" piece for the bottom, a 15 3/4" piece for the top. Cut the back piece to whatever dimension you cut the side pieces.
I set one of the end pieces up to help me set up the angle on my radial arm saw. It's 34.3 degrees.
I cut the shorter piece first. The 1 3/8" (or 2 3/8" for taller box) dimension is the shorter part of the angled cut. You will have to do a little calculating to make the cut (I figured at adding 13/16" to the dimension you used to come up with a top dimension).
I put the short piece in place, measured out to the tip and cut the angled bottom piece. I used 8 1/2" from tip to tip.
Here's a "short" box with a couple of the boards colored in.
Here's the "tall" box.
Use glue to hold the box together, screws are there just to hold it together while the glue dries. You will need to cut a small piece to seal up the front tip also.
I calculate the volume of the box at 7.5 X 5.125 x 20" (inside dimension) = 768.75 cubic inches / 2 = 384.375 cubic inches for the "tip" +
6.5 X 7.5 X 20 = 975 cubic inches for the "box" part. (use 1,125 cubic inches for tall box)
384 + 975 = 1,359 "short" box cubic inches = .786 cubic feet
384 + 1,125 = 1,509 "tall" box cubic inches = .873 cubic feet
Mrkln has all the tips you need to add the fiberglass bottom. :seeya
Corvette Store
Anyone have a template for a box for the C5?
