OK, I am going to get a little more specific. I have an F150 crew cab, that right now I have 2 cheap planet audio 10"s under the rear seat. I am looking for a set of subs to replace these that will get louder. the mounting depth is 4 3/4 inches, max. And will play in an enclosure of .5 cu ft. Or has anyone used the single 10 in a ported enclosure under the seat? Or does anyone have any other ideas for a crew cab f150 that is still a family truck. Any help would be greatly appreciated. The two subs that I am looking at so far that will fit are the JL 10w1v2 or the Kicker comp10.

I actually did a single CVR in an F150 extended cab. Sounded decent in my opinion.

I've never heard Planet Audio subs before so i can't comment on which of the three subs you're comparing would be the loudest. I have however owned both the JL and Kicker models you're looking at getting for a replacement and if i was in the market again for similar models i would buy the Kickers without a second thought. There simply isn't that much difference between the two to justify spending twice as much on the JL's...