I'm in the same boat, and still can't figure out what would be best. The Wicked CAS box would be nice, but it only comes in 13" woofer version for the sport model. I really don't want something that big, plus it isn't inexpensive.
A standard woofer box is too big, and takes up way too much room.
"Good"Powered woofers still don't really fit anywhere for me, and some people say they don't add much. Bazookas that fit in the back in the "foam" area are only 6.5" and are supposed to sound "boomy". The Sound Ordnance 8" powered sub looks promising, but I don't see how it would fit behind my seat, I'm just too tall. The Kenwood pwered sub is only 5.7", has mixed reviews and may not fit anywhere.
I would love to make a custom, over-the-spare box, but I don't have the equipment. IT would be interesting to see if any of the 8" powered subs would fit securely over the spare.
The shelf speakers MacLean has look promising, though not cheap.
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