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4th order question


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Hey guys just doing the draw up for my 4th order. I no Cj helped me out in my last post on sealed specs so here is why I'm Thinking going on his recommendation. If you don't know I'm planning on running 4 dc audio lvl 5 15s m2 with ab 1100.1

1.75cubes sealed so sealed portion is going to be 7cubes. Sub mounted outside (so I can smell the coil ) then 18.5 ported without sub displacement so 17.5 with. With 400square inches of port. No I'm trying to figure out what to tune to. The box is about 26.72 cubes internally all together and I did 16" per cube is this correct. Hope I did this right. I have a pic of a drawing but not sure how to post it. Thanks for he help in advance

u only need the volume of the ported side for figuring port area, not the total box.

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