Originally Posted by k-mu
I would also like to know more info about this box, if anyone finds out what size it is in cubic feet, mounting depth also.
It looks like it has some spare room that its not in use, that could be put in use for an extra large box.
Email the shop for specifics, but he told me it had to be "shallow mount" type sub and they can increase or decrease the volume of the box, depending on what your sub requires, up to a certain extent of course. There's also a YouTube video on that page that gave some info.