I need help mainly with the port calculations for a 10 cubic ft box and a 20cubic ft box

This will not be a chambered Box I'm "not sure what size cubic ft box I'm gona build yet" So if you

have a formula that can figure port sizes that will help allot this is

for two BL 18'' subs. I can build a box just need some help with this.

Thanks

16 sq inches per cubic foot is supposed to be ideal as far as i know

1/3 sd usually works quite well also.

If you did 10 cubes (net)... 120 square inches of port area between 13 and 18 inches long would probably work quite well.

Note. "Net" refers to the total volume of air in the enclosure after subs and port have been accounted for.

Edited October 27, 200816 yr by Duke