i played this sub on my tru tech sh-1..
4,000 rms on music and sub played AWESOME.
bass raced 140's all day.
No signs of fatigue, no tear, voice coils are immaculate.
Not to put down the w7 (i owned both so i know hehe) but the XXX I liked even better than it.
i even used my tru 200.1 on it with 480 rms. and the sub played well, not to its potential but it was good enough.
sub is fine in 4 cubs sealed...thats what i originally had it in.