rockford fosgate t0

So I have a RF T0D215 or the 15" T0 that is rated for 800W RMS at one ohm, paired with it I've got a Hifonics Brutus 1200.1 (I know...), I know that the amp overpowers it and before say about a month ago I just sort of winged the levels of the amp and when it started to smell I know there was a...

Alright so I have a buddy who just started to upgrade his already substantial subwoofer to an RE XXX 15" its the 05 one, he paid about $200 for it with an enormous ported box. Good deal? What would you give tips to him saying? So for the yes and no, he's taking out his Rockford Fosgate 15" T0 2...