I only have enough room in my trunk for about 3.5 cubes after sub and port displacement. i'm wondering if a pair of R 12 will be good in that box. im going to run them off a hifonics 2008D so i can give them any where from the 500 to 1000 RMS each. if thats not enough space do you guys think a 15 inch R with 1500 watts would get loud? ive never dealt with a single woofer before i've always had a pair. thanks.