Perhaps a bad driver shorting out the amps? I don't know, that's pretty strange. Axiom knows how to make subs and this aint rocket science. (amp to speaker in box i mean, not amp design, driver design, etc)

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire