true is it like carboard right?polarisIQmn said:^^^In all the boxes I've built, I've just traced the template that should come with the subwoofers then cut it out with a jig saw. It doesnt make a PERFECT circle but its close enough as long as you're not way off. DO NOT i repeat DO NOT! cut a 15" hole for the 15 and two 12" holes for the 12s. You will have no wood to skrew the subs to. There should be a template that comes with the subs that you can trace out. Good luck!