Took some much more accurate measurements and used the exact dimensions of the speakers and amplifier. This design maximizes the amount of space for the subs while attempting to keep it as little impact as possible (storage space is a premium in this car). I discovered that the speakers have to be isolated from the subs, so now they're placed in separate chambers (which reduces the amount of space for the subs). The tweeter is in the sub chamber so that it doesn't fire into the soft top when it's down. I'm planning on using baffling to isolate it from the sub chamber. The back of the tweeter is pretty isolated by itself, so foam baffling should be plenty of isolation. The MDF was switched to 1/2" but that should be fine as long as I use a hardening agent on it (resin/bondo mixture, epoxy enamel, etc.). Also considering using the left over sound dampener from the insulation project as well.
The next step will be to do more calculations on this design to see if its sufficient (with the use of a speaker poly-fill). If the design has more than enough internal space, I'd like to move the amp back to the rear of the box. It would simplify the design and make it more hidden. With the amp in the front like this, it will be exposed for cooling purposes. In the back I'll have to install a fan or something.
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