Box tuning help

[aturcotte127317 10+ year member]

Just double checking that this will be good for my 18" BTL:

7 cubes after disp. tune it for 47.44 hz. (4) 4" ports 5.5" long. (port displacement of 302 cu in or 0.175 Cu Ft.)[this assumes each port to have.75 inches in the wood.]

Then i was thinking interchangeable ports for my daily it would be:

still 7 cubes but tuned to 38Hz and it would have 3 ports that are 4" diameter by 7" long.

any input appreciated

EDIT: or maybe tune it to 32Hz for daily, and use 4"x11" ports

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[aturcotte127317 10+ year member]

any input??

 

[aturcotte127317 10+ year member]

anyone??