if you play anythign below the tuning freqency (lower the worse), the sub will play in a state simular to free air, and when you throw tons of power to a free air sub, it tends to die.......so moral of the story is if you dont have a SSF, DONT PLAY ANYTHING LOWER THAN UR TUNE....a few Hz lower is ok...but if you're at 32Hz, anything below 28Hz will be bad news fr ur sub......get an amp with a SSF on it, if you dont have that, then i happen to have an external SSF that plugs into ur RCAs that is for sale fairly cheap (brand new they're liek 40 shipped...ill do 15 shipped)...PM me if you need it (harrison labs PFmod inline subsonic filter)