I've got to say that "Jazz"s advice is right on, when you install any subs, HOW you install it and the enclosure it is in is even more important than which sub you buy and how much you pay for it! I bought 2 of these to replace the factory 6.5" subs in the back doors of my Chevy Astro work van, which came from the factory powered by a 50 watt per channel amp and they were instantly a HUGE improvement. I had an older 2 channel HiFonics amp that puts out a true 150+ watts per channel laying around that I added in a couple weeks later and now they sound and pound about as good as you could get for a pair of 6.5" subs, they really surprised me and they aren't even in enclosures, they use the inside of the rear doors for the enclosure, but the key thing here is that I really mounted them as solid as I could, so there's no rattling at all. As far as the guy who says the JL's are better, I sure hope they would be better-because the JL's cost FIVE TIMES AS MUCH!!! I'll take the $25 Lanzar subs mounted right ANY DAY over the $125 JL's mounted wrong! I've got to say, Lanzar is putting out some great speakers and amps for really great prices, I know a few different people that have bought various Lanzar speakers, subs and amps lately and they all have great things to say about Lanzar's stuff!