http://www.partsexpress.com/pe/pshow...=290-570&DID=7 anyone have experience with these? The stats there are very intriguing, especially at that price. And producing output comparable to several 18" drivers? What's the deal on this thing, and would I be getting in way over my head to try to build a box for it? Sounds like it takes some pretty intricate work to make the right box.