I wonder what causes subs to die? Limiting circuitry have been around for decades to prevent overdriving the sub (even my 29 year old Mirage sub has one).

Inadequate switching power supplies appears to a culprit in modern subs, but that's not applicable with Axiom subs and their linear power supplies.

Author of "Status 101: How To Keep Up In A World That Keeps Score While Buying Into Buying Less"