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<blockquote data-quote="Trixter" data-source="post: 1585537" data-attributes="member: 542668">what tuning freq. are you looking for? here is an example of the lengths....for the box (assuming that you took sub displacemednt into account when you mentioned 3.4cu&#039;)-@ 28hz your port length would be 24.6&quot; with the flared ends and 19.6 with out-@ 30hz your port length would be 20.6&quot; with the flared ends and 15.6 with outas you can see, the higher the tuning freq. the shorted your ports will need to be. knowing the freq. is a key factor.the reason i gave measurements with and without the flared ends is because you will have to cut the middle section to the smaller number i gave and then add the ends to get the larger number. i did take into account port displacement for these figures.i know that 2 4&quot; ports is skimpping on port area, but you want to go with the areo ports and i figured that this would work the best for you and not take up that much displacement. this way too, you can put them inside the box...provided you have the room like i stated before.if your box has enough room, on the top side i would imagine since your in a truck, you could add 4 4&quot; ports on the outside of the box. the advantage to this is you can add more port area and you won&#039;t have to worry about taking up displacement inside the box. although it will not look as nice, you will have 4 4&quot; tubes sticking up from behind your seat. but, if you dont&#039; care, this would be the best way to go.</blockquote>

[QUOTE="Trixter, post: 1585537, member: 542668"] what tuning freq. are you looking for? here is an example of the lengths.... for the box (assuming that you took sub displacemednt into account when you mentioned 3.4cu') -@ 28hz your port length would be 24.6" with the flared ends and 19.6 with out -@ 30hz your port length would be 20.6" with the flared ends and 15.6 with out as you can see, the higher the tuning freq. the shorted your ports will need to be. knowing the freq. is a key factor. the reason i gave measurements with and without the flared ends is because you will have to cut the middle section to the smaller number i gave and then add the ends to get the larger number. i did take into account port displacement for these figures. i know that 2 4" ports is skimpping on port area, but you want to go with the areo ports and i figured that this would work the best for you and not take up that much displacement. this way too, you can put them inside the box...provided you have the room like i stated before. if your box has enough room, on the top side i would imagine since your in a truck, you could add 4 4" ports on the outside of the box. the advantage to this is you can add more port area and you won't have to worry about taking up displacement inside the box. although it will not look as nice, you will have 4 4" tubes sticking up from behind your seat. but, if you dont' care, this would be the best way to go. [/QUOTE]

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