I have a crew cab truck, with 4 Kicker Solo Baric L7 15's, running off a Audiopipe 3000.1D, in a huge ported box. I am going to rebuild the box and add a capacitor. I was wondering everyone's suggestions on boxes. I can fit just about anything because I took my seat out. It sounds really good now, but I just want more. I have considered a bandpass, but I know they are limited to certain ranges and I listen to a lot of different music. Should I just stick with ported? Since I'm adding a capacitor is worth the money to add another battery? Its a big truck so adding one isn't an issue. I just don't have money to waste.