Speaker Box HELP!!

[Stem 10+ year member]

OK I need some help. I just got my 15" in yesterday and now i need to build a box. Im gonna make it ported. Its a RE SX, and RE's recommendation is it be 3.5 cubic feet PORTED. But i dont know how to find the volume of a box with the port. Im gonna use a rectangular port... not pvc tubes. And via enclosure calculators i found out that if i make a box (WxHxD) 30"x17"x15.2" it will be 3.50 cubic feet. BUT how do i find out the port, i dont know where to subtract or an equation. Dont gimme any of that GOOGLE IT, crap because ive checked and all those calculators are for circular ports. So can someone help me out please. BTW i can fit a 43" wide and 17" high box in my trunk. Thats the max. So if someone can tell me the equation or help me out, or even make some plans that would be awesome.

Stem

BTW: PS: The port im gonna make is 32 Hz. So i'd need to know the width of the port, since it will be 15.5" high and 14.5" deep.

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[mihklo 10+ year member]

try this site

http://www.accelerator-pedal.com/ported-box.asp

 

[96civ 10+ year member]

I'll have a picture of the cut-out dimensions and the picture of the box later in the day.

 

[96civ 10+ year member]

Try this...

 

[Stem 10+ year member]

wow bro thanks that looks awesome... just one question, when i plug those exterior dimensions into a calculator (http://www.the12volt.com/caraudio/boxcalcs.asp) it says the interior volume will be 4.97 cuft. But does that mean, with the port included it will be 3.5 cuft?

 

[96civ 10+ year member]

wow bro thanks that looks awesome... just one question, when i plug those exterior dimensions into a calculator (http://www.the12volt.com/caraudio/boxcalcs.asp) it says the interior volume will be 4.97 cuft. But does that mean, with the port included it will be 3.5 cuft?

It's good that your calculator came up with 4.97ft^3 because that's what my results were. 4.97ft^3 is the volume including the driver and port displacement. I calculated that you need a net volume of 3.5ft^3, with a port (the port displacement of the layout I have given you is 1.294ft^3), along with the driver displacement (.18ft^3). So I have accounted the total volume of the box to be 4.974ft^3... 3.5 + 1.294 + .18 = 4.974ft^3.

 

[Stem 10+ year member]

god **** tahts frikking awesome... thanks a SHITLOAD bro... u just saved me SO much time, hhaha Thanks again dude

 

[SAG3 5,000+ posts]

make sure to take pics when you make it

 

[96civ 10+ year member]

god **** tahts frikking awesome... thanks a SHITLOAD bro... u just saved me SO much time, hhaha Thanks again dude

Lol, no prob man... just make sure to take those pics as SAG3 said.