I'm sure the quality is just not as good as a handmade american built sub, what can you really expect from a chinese built mass produced subwoofer? Just saying, if you want an bit of an upgrade save your pennies and go with a set of these badboys https://ssl.perfora.net/www.ficaraud...iew.shopscript
Like I mean you won't have a car left after it blows out all the windows and permenently defen's you. Lol I have one coming and have already have had 2 of these and they are amazing. Puts the kicker to shame considering that the l7's are squares..
https://ssl.perfora.net/www.ficaraud...iew.shopscript
Trust me, those will not dissapoint.