Do you have enough room. A 6th order for 2 12's will not be skimpy in size lol. Figure the total box will be somewhere around 8-10 feet (total box size including the port and whatnot)yeah the fs is like 42.9 iirc, im doing a box now and with me getting a huge allergic reaction to friggen dust while cleaning my shop i rushed the box and now its kinda a mess so im thinking of trying a bandpass it'd be for 2 12" subs.