Yeah, it might sound crazy, but I want to put a small sub & system in my Miata. After researching, I've decided against putting a sub in the trunk, because (a) it supposedly sounds like crap, and (b) I don't want to lose 0.75 cubic feet of trunk space.
A popular option is to install 2 small (6-8") free-air subs on the package shelf behind the seats. I've decided against that because I've never heard a free-air sub that sounded good enough. Plus the install looks pretty daunting, you pretty much have to take a good portion of the interior apart. I want something I can work on a bit at a time, the free-air sub install pretty much has to be done all in one shot.
Here is my plan:
Take out the spare tire and build a false floor for 2 amps (one 2-channel for front components, one single-channel for the sub[s]). Yeah, I'll lose the spare tire, but not any trunk space. Works for me.
Build a custom sealed box for (1) or (2) 8" subs, placed on the package shelf behind the seats. I would have to remove the windblocker for this to work. No big deal. The speakers on the windblocker suck, and the sub box would function just as well as a windblocker.
I only have about 6" of depth available to not interfere with the top. I don't want the box to be too tall to not block rear visibility. The windblocker looks to be about 10" tall (it's about 11-12" 'tall' but it is angled back a bit). I wouldn't mind going a *bit* taller than that, but lets say the box will be about 12" tall.
The box would be the width of the car minus ~6" on each side, this is to allow for a rollbar install in the future.
Most 8" subs I've looked at require 0.3-0.5 ft^3 of volume in a sealed box. I think I may be able to pull off having (2) 8" subs, but I have no problem using only one if space doesn't permit. If it's close, I could always put some polyfill in the box.
Now, I'm not concerned with ground-shaking output, just something to 'fill out' the bottom end. This is why only (1) or (2) 8" subs will suffice for this.
I was looking at Kicker CompVR's, and Polk/MOMOs.
Anyone have some advice? Or is my plan ridiculous and stupid?