cyantist

03-17-2004, 10:10 PM

I'm designing a dual slot-ported box for my single 15" Brahma and was wondering if somebody experienced could run the numbers, so to speak, and confirm these dimensions. The box will be built using 1" MDF, and the inner walls of the slot ports will be made using 3/4" MDF. The measurements I have are:

Outer Dimensions - 30"W x 17"H x 22"D

Port Dimensions - 10"W x 2.5"H x 26"L (x 2)

The main concern I have is that I may not have done the math correctly by calculating the slots as solid objects. Are they?? If they are not calculated as solid objects, then what is the proper formula to use? The formula I used was 10.75 x 3.25 x 52 = 1.05^ft, which I added to the original 3.5^ft along with the 0.24^ft displacement of the driver, +-0.10^ft for some bracing material, which gives a gross volume of 4.9^ft.

If my calculations are correct, this gives me approx. 3.5^ft net volume tuned to 26Hz (not to mention some nice bump in the trunk). http://acoustic-visions.com/forums/html/emoticons/wink.gif

Sorry to be a PITA, but I really want to get this right the first time as this box is going to be permanently mounted in the vehicle and changes won't be easy to make once it's in place. Does everything look correct? I just want to get some confirmation by a pro before I start construction later this week.

Thanks in advance...

Outer Dimensions - 30"W x 17"H x 22"D

Port Dimensions - 10"W x 2.5"H x 26"L (x 2)

The main concern I have is that I may not have done the math correctly by calculating the slots as solid objects. Are they?? If they are not calculated as solid objects, then what is the proper formula to use? The formula I used was 10.75 x 3.25 x 52 = 1.05^ft, which I added to the original 3.5^ft along with the 0.24^ft displacement of the driver, +-0.10^ft for some bracing material, which gives a gross volume of 4.9^ft.

If my calculations are correct, this gives me approx. 3.5^ft net volume tuned to 26Hz (not to mention some nice bump in the trunk). http://acoustic-visions.com/forums/html/emoticons/wink.gif

Sorry to be a PITA, but I really want to get this right the first time as this box is going to be permanently mounted in the vehicle and changes won't be easy to make once it's in place. Does everything look correct? I just want to get some confirmation by a pro before I start construction later this week.

Thanks in advance...