box for 2 12 lanzar max12d subs

I am not sure if anyone can help me or not, but it is worth a shot. Can someone help me build a box that will hit as hard as it can with 2 12" Lanzar MAX12D subs. No need to worry about the amp or power or anything, just a box that will hit these to their fullest potential and I know they are not the best, but it is a friends system and I told him I will help him as much as I can. So if someone can help me, that'd be great. They are 2 12" Lanzar MAX12D subs they say 1000watts max, I have been looking online but cant seem to find any box specs on how to build a box that will hit these as hard as they can, so any help is appreciated. Thanks!bp

FIY knowing the power that is going to be going them and the vehicle they are going in would help with box design for output. Also so you know Lanzar says this sub is designed for small sealed enclosures. The specs can be found here. http://www.lanzar.com/manuals/MAX8-10-12-10D-12D-15D.pdf But they do not list and recommendations for airspace. Im guessing anywhere from 1.0 to 1.5 per sub, But with out plugging the numbers into a box building program this is just that, a guess.

I already looked there, thanks though and yeah, I know its made for small sealed enclosures. Thanks. Also, its going to be powered by a 1050 watt jensen amp. 1ch. amp. the specs on the amp are below. Im trying to find airspace basically, to put it in something that is going to hit them as hard as they can. 1050 Watt Mono Class AB Amplifier Low-Pass Crossover Filter: 40-150Hz Encapsulated Power and Speaker Terminals Circuit Protection Against Short Circuits DC-Offset & Thermal Overload Remote Input Level Control Remote Bass Control Variable Bass EQ: 0-12dB at 45Hz Frequency Response: 5Hz - 150Hz Dimensions (LxWxH): 17" x 9.0" x 2.5", Weight: 8.6 lbs.bp