i recently bought a p100bd amp along with 2 12 inch kicker cvr subs in a slot ported box which the amp blew the subs every time i turned the gain alittle passed 3 i replaced them through the warranty and they blew out again now i have 2 12 inch memphis subs not really sure what model but in a enclosed box but i dont want to blow these ones out what should i do? how should i tune my amp?