I used to have 2 kicker CvR 12s in a ported box and could turn up my radio all the way and they would be fine but now i have 3 in a sealed box with the same amp but now when i turn it up all the way the subs bottom out really bad i have more then the minimum air space for a sealed box. anyone know what would cause this? all the wiring is correct was wodnering maybe if i ported the box if it owuld fix the problem. thanks for all the help.