Well I bought a pair of these subs because of JL's reputation. I have a 05 GMC Crew Cab and really wanted to put them behind the rear seat. I've had boxes on the seat and it uses up too much space and makes a crew cab worthless. and i like to use the space under the seat and its just a mess to build a box for there. I also enjoy listening to my music very loud. I ordered a pair of these and hooked them to a Kenwood 1904D Amp and it pushes the pair pretty good. I have them in one box built to JL specs with a divider and sealed. They are pretty loud. I listen mosty to rock, and a lot of country. The subs aren't quite quick enough for quick pounding rock songs but they dont keep up bad for 13's. I talked to the local stereo shop and they didn't like them. They said when the JL rep came by and showed them in a spec box they werent very impressed. They said themselves they would put them in a much larger ported box and they sound better but that is a waste of the point of putting this thin of a sub in a large box. They were impressed with the sound of them in a spec box in my truck. I myself personally will probably step down to about 10's in a pair or maybe three for my crew cab. Bottom line if u like loud bass and have very little room or where you want to put them is a very thin space these are probably good to get but beware the 13's arent the quickest if your anal about very quick hitting bass.