I’ve finally found this thing!http://www.mtxaudio.com/caraudio/products/subwoofers/jackHammer.cfm I think it’s really cool, what do you think about it? I know that it’s a shit tax with 7499$, but: it’s worth it? I don’t know about systems soo well, to install a small one with 400 watts my knowledge is enough, but with the Jackhammer sets out! What does everything have to do with it? How many additional batteries? I find this is the hardest thing I’ve ever seen….