IF that amp does rated and you have completely stock electrical, and both subs share 1 cubic foot then you and your installer both are idiots. You probably starved the amp to death, taking out a perfectly good sub in the process(though clipping at low voltage, I would guess) because you probably are not even smart enough to purchase a $25 dash mounted voltmeter that would help you prevent such things....what size power and ground wire did he run? where is the ground located? Sanded and bolted? Stock staring battery?...etc, etc, etc...If I am wrong and you do have the electrical upgrades necessary for such a powerful system, then I regress........but I doubt it.