Ok Guys just joined never built a box before but I just bought these subs and am planning to put them in my house for a little extra bass... That being said Size is not a problem as long as it can get in and out of the door. I am wanting to build a Band pass box with both speakers faced out and sealed on the front (with plexiglass) and ported on the back these are dual 4 ohm and I plan to wire them together a 1 ohm. Now that is about as far as i made it because other than the dimensions in in the manual for a sealed and ported box I'm not sure how to decide how big each chamber needs to be. Any Help would be greatly appreciated