I am about to build a box for an Ava 15 that i just got, but i am torn between ported and sealed. I have the plans from AA for a 3.5 @ 28hz, and i will either build that or a ~2 cube sealed box. I want the low-lows but i also want it to slam like hell at all frequencies. Is the Ava 15 a sub that can play hard at and around its tuning freq. in a ported box? or should i go sealed if there is not that big of a difference in output. Let me know, i want to get started on the box asap. thanks.