I am either going to buy a single 12, or 15. I am most likely getting a sx15, or eclipse ti 15(or 12....)but was wondering, with the limited amount of space i have which would be better, to go with the 12 or 15? i have about 1.5 cu ft.(single cab truck...maybe 1.75..maybe) Which sub would this enclosure best fit....also, should i go ported or sealed.