Design....

[Loudrango112]

"4.5cf tuned to 30hz for daily... 4 aero ports 36" long... face the sub up and the ports out the end. for comps use shorter ports... start about 15" long and test... cut some more off then test again.... till you find what length is the loudest. you can get buy with 3 ports, but it wont be as loud. if you have win isd you can calculate your ports yourself... just use the XXX specs to get your port tuning... "


36" long.... EACH?
15" long ....EACH?


Alil confused.... can someone help me with this design?

[Loudrango112]

cause on winisd....
4.5 cubes... vent length 30 inches..... = 30hz....

[Loudrango112]

bump to the top

[req]

four 4" aeroports at 15" each in 4.5 cubes will yield around 41hz.

however, the same setup, with 35" ports, will yield 27hz :)

12" = 45hz
10" = 48.4hz

hope that helps. remember, in winISD, you need to set that there are FOUR 4" ports :)

[Loudrango112]

I did... just wondering y he said a certain length and hz... but it wasnt that exact same

[Loudrango112]

so does this sound right to everyone?