Is there any 18's that can handle 2000+watts that dont require alot of airspace?

Sundown Audio 18s are quite happy in 4ft3 net each, but dont need that much power.

Perhaps a pair of those and you keep you gains on your amp back a little bit?

I honestly would do some 15s, 18s that handle that much power, and work in that small of an enclosure are far and between.

 
You can run RD Heavy Weight 18's in 5.5 cubes each and they will get nasty. Built a box for Steves Tahoe for 2-18" HW's with 5.5 cubic feet per sub and 117 square inches of port total tuned at 35Hz and we are doing 157s

 
I have found that most of the large 18s that are designed for car audio work in 4-5 cubes. And I do know that hdc18s will work that small. Although you will want to start tuning at 36hz and work your way up. They don't have the low end extension tuned at 40 in such a small box.

 
I have found that most of the large 18s that are designed for car audio work in 4-5 cubes. And I do know that hdc18s will work that small. Although you will want to start tuning at 36hz and work your way up. They don't have the low end extension tuned at 40 in such a small box.
He's right the HDC318's will work fine in 4.5 cubes, tune around 35-36

 
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