bitin yun 500w sa 13w7. better get the 1000/1 which goes for 40-50k also. check that sub n amp 80k na. peak is 2000w. recommended continuous is 1000w. or get a high powered amp at 4 ohms - which can be run/stable in a 3ohm impedence. 3ohms kase yun w7's. say for example an amp at 800wX1 at 4ohms it will be 1200w at 3ohms when you connect it to the sub.

check with a+ audio or jetcar. from what i've heard next year Q1 pa darating.