i think my amp sux cuz the same thing happened to my last subs except the wire broke in the middle. this time the wire broke off the voice coil. i have a 800 watt rms SPL amp so it kinda sux but i have them in a sealed box. i dont know how it happened but it happened to both of them. yeah if there working and not breaking you will not be dissapointed. 2 of them are louder than some peole with 4 12's.