I purchased a set of these and they are no good. If you put a 1500 watt amp to them, they will have over excursion from too much power. EV pre sales state they are tour grad subs, hence the name tour-x. EV Tech support claims they are a cosmetically altered Terminator with 2.5 inch voice coils. I can tell you they cannot handle any pro wattage. 900 watts they sound pretty good but not loud enough. pump them higher and they cannot take it. As far as I'm concerned EV should be ashamed to have fooled the public into thinking they were tour quality. They can't deny it because they named them Tour-X. I should have known better as they are not even 100% birch plywood like 99% of pro subs are. SHAME ON YOU EV!