There are 3, 3" ports, don't know the length, i'll have to see if i can take them out tonight.
It' s a cylinder with 16" diameter and 46" height. So it'd be 9244 minus the port volume and whatever space it taken up by the plate amp.
The amp is a 525W bash amp.
I emailed SVS too, to see if they can provide the port length and volume.