i tried a AF GS10 D2 in a ported box and the Helix E&F channels were not enough to drive it effectively. I am in the process of adding an external Zapco amp and switching back to my 12" CSS SDX12.

I think minimum you would want to do a pair of D4 10's and get something that has the highest sensitivity possible. Which the GS10 does have a high sensitivity.

But i would save yourself the time and go to an external amp.