im working with 6.5 cubic feet after displacement. ill be using a square 10 inch port, so 100 sq inches, but i need to know what port length is needed to obtain a tuning of 40 Hz. i realize there are lots of these calculators online, and i even have winisd etc but i have no access to those things right now. plus, id like someone with a reliable calculator to chime in. any help appreciated.
