well yea I'm gonna throw 600watts rms at it using the Alpine PDX 1.600... but what do u think of the bandpass boxes.. they're like half vented half sealed

 

DO NOT build a subwoofer enclosure to those dimensions. Square enclosures cause standing waves, and standing waves make your ears cry. Cubes are worst, but if any two lengths are equal, you will have a standing wave.

Also, keep in mind that you want 1 cu. ft. INNER volume, not TOTAL volume. So figure out three different dimensions that multiply together to make 1,728 cu. in., then add 1" all around to one pair, add 1" in one direction on a second pair, and leave the third pair of panels the original dimension; this will compensate for the thickness of the MDF.

You'll be pretty close with inner dimensions of 10.25" x 12" x 14" (1,722 cu. in.) and total dimensions of 11.25" x 13" x 15".

So, your pieces would be:

15" x 11.25" (x2)
12" x 15" (x2)
12" x 10.25" (x2)

Put them together like so:



And voila!I would cut the hole for your driver in one ofthe 12" x 15" sides.

 

And also if I remeber correctly that amp's have there own RMS rating so be careful that what there advertised rating is what it is. I think it was MTX who started putting ( birth certificates) with there amps and it gave you the advertised and the actual output for each individual amp. Just a thought.