I bought 2 of these in a seled Jl Audio Box with a 1400 watt Jl Audio amp. Man, that is the deal of the century. The 1400watt amp is just powerful enough for one sub and since i still haven't upgraded my door speakers (that's tomorrows project) I can only put my HU to 25 out of 40. Basically at my max volume i'm only putting 5/16ths of the power these subs can handle and EVERYTHING rattles when they are this high. The mirros, cars beside me, my eardrums feel like they are about to fall off. I'm telling you theses are the best subs I have ever owned and I plan on sticking with these for as long as i can find them.