i've never seen a 750.1 bench under 900wrms, more around 950wrms. even though the kicker is a better amp the hifonics will put out more power. still think a 3512 should get more power/better amp than the hifonics though.
that hifonics should be alot better than the kicker, and should make that sub get LOUD. a guy on this forum has a 3512 on 1200 watts and he's hitting 143