It's been a few months, but they sound pretty damn good on their own. Didn't have quite the thump of 2 SRM450s with 2 15" Mackie subs, but they sitll sounded good. How would 2 SA1521s with subs compare costwise?
i've used the SA1521 in many applications and it's a far superior cabinet to the others in the line. a pair of those and some subs and you'll be rockin' hard