Well, I sure wish you had told us about your intent before you went ahead and bought the Mackie's. We could have perhaps let you know what we thought before the money changed hands.

The thing is, have you looked at how big the SMALLEST Mackie sub is? http://www.mackie.com/products/speakers/index.html#portableactive

It is HUGE, expensive, VERY heavy and WAY more than you are ever going to need to balance a pair of SRM150's...

I am sorry, but I just don't see it.