1600 watts, two twelves ;) lol, I can post how mine is

Two pages and still no idea what OP has for equipment.

Can't help him with much other than positioning like trewyn15 tried.
Every sub has its own "needs" and the right box for one 12" is the wrong box for another 12"

There's other ways to actually tune the amp though.

Finally got it tuned in. Need some superglue now. 400 watt was definently enough