Posted February 20, 200817 yr a box's internal dimensions -10.5" high 35.5" wide20" deepIf i put a port in it width-wise, slot port along the wall, 10.5" high x 4" wide, and run it across and leave a 4" gap from the wall resulting in port length being 31.5" long + 0.75" for wood thickness exiting box...When i calculate port displacement, do i find the cubic volume of 10.5" x 4.75"(plus thickness of wood) x 31.5"or10.5" x 4.75" by 35.5" ?Do i take into account the effective area around the port too? because if i do then i would choose the 2nd option above as part of the displacement.
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