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hey all, i dont post much but this is my go to site for help with my projects. Im building someting like a half-wall in my acura cl. no taller than the window line. im using 2 Audioque SDC2.5 15" subs. no my question is, when designing the box, whenever i get my gross volume set, and then figure my port dsplacement the port takes up so much space i keep having to make my gross vol bigger, then the port needs to grow, and so on.

should i figure my port displacement based on gross volume first and then just add that to my gross? i feel stupid but im just trying to do this right the first time. I appreciate any and all input.
 

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figure out how many cub ft you want then add the port to that.
The only thing that changes is the box overall box volume.
Say you have a 3ft box and 1 foot is port then you have a box volume of 2 ft.
 

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hey all, i dont post much but this is my go to site for help with my projects. Im building someting like a half-wall in my acura cl. no taller than the window line. im using 2 Audioque SDC2.5 15" subs. no my question is, when designing the box, whenever i get my gross volume set, and then figure my port dsplacement the port takes up so much space i keep having to make my gross vol bigger, then the port needs to grow, and so on.

should i figure my port displacement based on gross volume first and then just add that to my gross? i feel stupid but im just trying to do this right the first time. I appreciate any and all input.

As the net volume increases, the overall length of the vent gets shorter - provided that the surface area & tuning frequency remains constant.
 
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