Naw you can put 1200watts on a mag with no problem. Thats what i got running to it and i couldn't be any happier with it. As long as you don't blast the gains and bass boost you'll be in love with this sub and never want to sell it... Just like me.
99 GMC Suburban
Sub Amp- a2150hct audiobahn(yeah i know)
Sub- 12" SI Magnum D2
HU- Pioneer AVH-6600, dvd in-dash 6.5" screen
Speakers- 6.5" Rf 3-way coaxials, off HU power (Aura mr62's awaiting install possibly in new car)
Box- 2.5cuft @ 29hz.