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<blockquote data-quote="30hrtz" data-source="post: 4887405" data-attributes="member: 582403"><p>its very easy to build a 4th order bp box.you dont make 2 seperate boxes.just get the totol cuft you need(front and back)add them together i.e.8 cubes 2on sealed 6 on ported.then just figure up with the space you got to work ith a good length height and depth,and build 1 rectangle box.when you put the speaker baffle in or (divider from sealed and ported)put the sub in and put on your last recangle peice to seal the whole box.you can make the ports out of 6&quot; cardboard cement molds at lowes.they are like 5 bucks for a 5 footer.if you need 70 inches of port youll need 3 cuts off the tube.each being 28 in of port.just start out with them about12 inches long and cut them down until you like the response.doesnt sound very technacle but ive done many over the years,some great some o.k. but by adjusting port lengths was able to get all to sound repectable.in your situation,i would go large ported,if the bandpass thing dont workout.( oh and 3 of those ports would give you 84 inches of port so ya start a lil long with whatever you use and shorten them it increase tuning frequency.</p></blockquote><p></p>

[QUOTE="30hrtz, post: 4887405, member: 582403"] its very easy to build a 4th order bp box.you dont make 2 seperate boxes.just get the totol cuft you need(front and back)add them together i.e.8 cubes 2on sealed 6 on ported.then just figure up with the space you got to work ith a good length height and depth,and build 1 rectangle box.when you put the speaker baffle in or (divider from sealed and ported)put the sub in and put on your last recangle peice to seal the whole box.you can make the ports out of 6" cardboard cement molds at lowes.they are like 5 bucks for a 5 footer.if you need 70 inches of port youll need 3 cuts off the tube.each being 28 in of port.just start out with them about12 inches long and cut them down until you like the response.doesnt sound very technacle but ive done many over the years,some great some o.k. but by adjusting port lengths was able to get all to sound repectable.in your situation,i would go large ported,if the bandpass thing dont workout.( oh and 3 of those ports would give you 84 inches of port so ya start a lil long with whatever you use and shorten them it increase tuning frequency. [/QUOTE]

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