If he is still around, would like to know if there was a box built behind, or if it is just being used as a free air sub with no box?
And if it is a free air how it sounds or if it rattles anything back there to where it can be heard from the outside?
I have 2 skar vvx 8's in a sealed box, the tripple stacked magnets gets lots of xmax, but no rattles heard from outside.