i ran a powerbass xta 4k at 1 ohm on a 12 xl d2 and never had problems after i tuned my setup . i ripped 1 because of no tunning and reconed it then beat the hell out of it and didnt have any problems until i took out my system for a rebuild im working on . my box 5.5 cubes tuned to 31hz 62'squared port in a ext cab s10 with 3 12 xls and 3 pb 4k
2400 to 2600 watts on each one after my crazy rise