Ok i downloaded/bought the subwoofer design toolbox. The only problem i have with it when designing a ported box is it doesnt calculate net volume after port, driver and bracing displacement. I downloaded the torres program and it does do all of this i am just a freak and want to hear some other input as to how accurate it is. Just to answer all the required questions the box is for 2 10 inch fi ssd's. Net volume is 2.84ft3 tuned to 31hz. The dimensions of the enclosure are height16xwidth34xdepth17. Port height 14.5 port width 3 port length is 37 but in this calculator it gives a second value of physical port length:33.25 this has me a little puzzled if someone could please explain this? amp is a hifonics bxi 2610d 1x1700 rms @2ohms. Going into a chevy silverado crew cab.Thank you in advance for any wisdom-Dave.