It will house 2 RF P212d4's. Not the new black models the older ones with the removable magnet cover. I would be able to design one but I do not have the manual and rockford's website does not either. It is going in a Scion TC so I am going to build it to specs which is 1.75 cubes per sub. Tuning anywhere from 35-40hz. I will be powering them with a Diamond D3 400.1. Height cannot be more than 12", W cannot be more than 40", and D cannot be more than 16". Someone please design me a good ported box for these woofers to these specs. Thanks.