correct me if im wrong but a d1 sub in parallel should be .5 befor box rise, so 2 d1's wire in parallel should come out @ .25ohm befor box rise
and for d1's u can do .25ohm, 1ohm, and 4ohm, like a d4 can be, 1ohm, 4ohm, and 16ohm but ive heard when u wire d4's to 8ohm each it ends up 12ohm i unno
but i say more pics n are those amps pritty efficent? i thougth yellow tops were shit, my uncle has 2 of em in his old drag car n they keep goin dead
but other than that, take a dmm n hook it to the amps speaker wires n set it to ohm n see what it is at the amp
and does both of em blow or just one?