2 small 2 be ported. Should be sealed. Nitro's size is good. 1.2 cubic feet sealed will give correct frequ. respose 4 that sub x 2. Connect to mono amp in parallel @ 1 ohm for best results. Rated power if possible. Separate enclosures (divider in box) not bad idea as it will provide bracing 2 improve box efficiency. Web search 4 max info. Have Fun
Read this
http://www.bazooka.com/pdf/current/rsw.pdf