I had a 15" L7 in a prefab at one point like yours, then had an enclosure built @ 32Hz and feeding the L7 1400 watts. Loved it, Got loud and did the job til I got used to that.yeah my pre fab is only 1.77 after sub and port....i have "700" RMS going to it but my amp is a MA audio so i am not getting all of that. i had a box desgine and it was 6 cubes tuned to 32 for 2 12" L7...i want another one...
Will going from a small as box at 43 for one 12 and going to two 12's with 6 cubes after sub/port @ 32 hz affect the output much.....