October 18, 200915 yr Author i just stuck the port in for that picture. Trust me when i measured it up it was 3.25 inches from the back, and i added in a piece to help the air around the corner. Also you should only subtract .75 inches from the total depth because the front thickness on the box is part of the port, and the port is 17.75 inches...i just round to 18. It doesnt change the tunning that much.
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