Eminence 10CX, 10" driver build.....Here are three graphs from WIN-ISD....The BLUE is a 1.42cuft box with a 4" X 5.8"L port.....The GREEN is a 1.6cuft box with a 4" X 11.64" port.....and the RED is the box I built which is 1.91cuft with a 4" X 3.59" port.......I can make my box smaller by adding a septum, but would it be advantageous to simply leave it as is for a bit of extended bass response? My cabinet is 33.5 X 11 X 9 internal dimensions......
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Most folks do...........and you can always 'critically' damp the vent to 'taste' 😉 to near enough try out the other two alignments.