haha thanks man.. so a single sub that is 1500 rms in a good box would be louder than two subs that are 900 rms total wattage in a good box?

Two subs will almost always be louder than one with the same power. Your question is hard to answer because there are too many variables. Could one sub that is getting 1500 rms get louder than 2 subs on 900 rms??? Possibly..... that is where the box design comes into play. Even with the extra power to the one sub, I would think that more cone area makes up for the loss of power. :dunno:

Your G5s have an Fs of 28hz and an hcca has an Fs of 44 hz. The lower you are able to tune your box closer to a lower Fs of a woofer will be easier to yield a higher output at a higher frequency.