Hey there

I have a 12" Apline type R sub, I've been reading various DIY ported box formulas, including those on Loudspeakers101.com. By entering my Subs parameters I get Vb=1.912 ft^3, Fb=27.1 Hz

I get a minimum port diameter of 5"?does this seem too large? If I use this value of port diameter then thelength has to be 34"???how do you fit that into a box of only 1.91 ft^3?

I know if I go with a 4" port then the required port length begins to drop, but wont i get too much air noise? should I use a higher Fb then the one that was calculated? say 30 HZ??

Any help to clear this up for would be greatly appreciated, thanks.

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