I am using a sub box calculator that i found on a web site. The link for the site is http : // www . accelerator-pedal . com/ported-box.asp. On the site it asks for the x max of the sub that will be used. I plan on buy a Pioneer Premier ts-w3002spl. Does any one know what the xmax on this specific sub is? I tried a couple of sites that have this sub for sale but I can't find it. I also wanted to ask if that calculator was fairly accurate, if anyone on here has used it before. I plan on the box being 2.5 or 3 cubes tuned to 35hz. I plan on having the sub mounted with the magnet out of the box so sub displacement doesn't play a factor. Any help available is appreciated. I'm not sure how to insert a link into a post but if you goto accelerator-pedal dot com it souldn't be too hard to find. Thanks guys!