Help figuring out port length...calculate before port displacement or after
I know I need to account for sub displacement and I think I do for the port also but just wanting to make sure. I have 20.29 cubes before anything and then 19.54 after the subs. Using 4 8" ports using 19.54 the ports need to be 18" to be 34hz if I calculate the port displacement then it would be around 17.5 cubic feet and they would need to be 20" to be at 34 hz. Thanks and here is a quick little draw up I did ha excited!
1946 Chevy Panel Truck: For Sale
1999 Ford Explorer: Also For Sale 10 15" Obsidian Audio subs, 5 American Bass 120.1 amps, DC 250 amp alt, 6 batteries, MB quart discuss 4125, 4 American Bass 6.5" SQ6B, 2 Selenium ST200