Hey i need help just bought a new subwoofer need help its a elevation 15" execution sub i have a 2000 grand prix gt i can have a ported box 17x35x18 h/w/d thats about 4.958 not - the subwoofer or - the port size my qustion is what do i set my subsonic filter too so i dont blow my sub heres where to find my speaker stats. www.elevation.com Please help also how big should my port size be for the box compared to speaker stats i want to use a slotted port not round !!