ok so i am making a new system for my car. it is 4 12" subs in a ported box. for power i will be more than likely using a soundstream rub1.2500d 2500 watts rms at 1 ohm. each sub is single 4 ohm so i can end up with a 1 ohm load. ok now here's where im slightly confused. for my box my width is 37 inches. height is 23 inches. and depth is 26 inches. but it will be a double baffle on the top so height will drop to 22.25 inches and i will be using .75 mdf all the way around each sub im guessing has a displacement of .19 so that is ending up at 9.684 cu ft. now thats great. also all the subs will be facing up firing at the roof. and for the port i want it at the bottom of the box firing at the trunk. make sense? ok so for the port i am thinking of 4 inches high. 35.5 inches wide and around 24 inches for depth (thats for the tuning) now with that i believe i am around 142 sq inches of port total, or maybe a little more, but not too worried with the sub displacement of those dimensions, im ending up around 7.712 cu ft total. so around 1.9 cu ft per sub now when im trying to figure out how much sq in of port to use. i am doing this. 9.684 x 14.5 and getting around 142. then dividing by 35.5 and ending up with 4. or close to 4 so that means my height should be 4 inches, since i used 35.5 as my width? is that right? and then the 24 just gives me a tuning of 34 hz.
is that the right way to calculate the port area? if so thats great, i have been building boxes right this whole time. but if not, what am i doing wrong? thanks
haha i got one earlier from my girl. i know this all looks confusing, and i tried to explain it as simple as possible. maybe to make it easier. how do you figure out how much port to have? i know you want between 12-16 sq in of port per cube to minimize port noise so is it total cu ft (like as if the box was sealed) x 12-16 and divided by the height to find the width needed or in my case i am using the width to figure the height im almost sure im right, but i could be wrong