2 cubes exactly with 2- 4" aero's, 25 sq.in. !!
and a brz1700 @.5ohm.
the one thing i did do was added a loading wall inside the box, right beside the sub,
so it had a wall on all 4 sides of the rear of the sub,
it's about 4" long/deep
my sub is offset to one end of the box like yours