willing to bet if you have your hds in a 42hz box, you'll Sh*t on all of them combined in that aspect lol, not sure about sound quality though.This^^^ you got guys running the crappiest stuff ever, performance teknique amps, pre fab boxes, kicker and rockford stuff and their systems are LOUD not low or car flexin but audibly LOUD. you can hear their cars from more of a distance then you heard my zv4 and my hds.