I have two 12" P2's in a sealed chambered box, being pushed by a RockfordFosgate Punch P2 900 watt amp. I've got it in a 05
regular cab f150 and I have the bass turned all the way down on the amp and maybe halfway on my head unit and my remote bass, and I can't turn up my volume past 4 or 5 with out getting out or rolling down my windows. These are some awesome speakers for the money. I highly recomend them. The best thing I like is, is that they give a lot of bass and a hell of a hit, and they don't distort or muffle out my highs coming from my mids and tweeters. Again, I highly recomend these subs and a rockford amp.