adidasxp17

thanks guys

im kinda new to ported boxs, ive built a few for some 12in subs and they sound good but now im building a new box for my 18in RE MT. could someone give me some help about what to tune it at..what freq of hz is really good for SPL and whats good for SQ?. i want my box to be a serious SPL box but it is in my daily driving truck.. so what would be a good number to tune it at? thanks its a 2000 chevy and its gonna be a cut through so the box is in the cab and the sub and the port r in the cab if that helps...