ok I have 4 sony 12s like this for my girls car and they say ported box volume is .82 per sub but that is only 3.28 cu ft for 4 is that enough it's going in a explorer sport subs up port back would like a little help with this that just seems like a small box as for a sealed box it says 1.15 per sub what would you do sealed or ported it is being powered by 2 1200 watt sony amps that is like 250x2 @ 2 ohms