Which set up should I do?

[DylanH 10+ year member]

IA is freaking expensive

 

[bubbagumper6 5,000+ posts]

if you have room for an 18" btl or lvl 5 then you have room for 2 15's.

Definitely not...Your comparing 254^2in of cone area to 353^2in. Two 15's take up a lot more space than a single 18.

That being said, I vote for a BTL and the AQ2200