Im down to these two, it's ether I get 6 ia li 15s on a aq 3500 tuned to 32 hertz subs up port back in a Yukon Denali or 2 ia dp 21s on the same amp tuned about 32-34, I want to be able to move tons of air and be loud, any help would be great

Bump

6 15's will have more cone area then the 21's

but it's all design and install

if you have the room to properly use 6 15s then I would def. do that, cone area ftw.

Enclosure details first.

using outside frame diameter as a quick guide u can also consider 4 18s which is 1017.36 sq" vs 6 15s = 1059.73 sq"