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