PDA

View Full Version : how to measure port displacement?



jd_man_90
11-07-2005, 05:16 PM
I am building a slot ported box and i am almost designing it but i don't know how to measure port displacement. do you just measure the displacement of the actual wood creating the port that is on the inside of the box or is the area inside the port part of displacement also? also does anyone know the displacement of a 12'' type r? thanks

iceteebone
11-07-2005, 05:21 PM
lets say your port is 3" wide 12" tall 15" deep. you are also using the side wall of the box as one of the port walls. what you do is take 3.75 (considering you are using 3/4" wood) x 12 x 15 divided by 12^3

jd_man_90
11-07-2005, 05:39 PM
so the internal volume of the port is considered displacement and is not factored in to the volume of the box?

iceteebone
11-07-2005, 05:44 PM
so the internal volume of the port is considered displacement and is not factored in to the volume of the box?


say you want 2 cubes and your port displacement (internal volume) is 1 cube. then you make sure your internal box volume is 3 cubes + the driver displacement

jd_man_90
11-07-2005, 05:59 PM
allright thanks