1. ## Figuring out missing dimension/volume?

Alright..here's the box I have in mind for my Brahma 15", I designed it base on the space I have leftover from removing part of the backseat in my extended cab F-150. Just realized that I don't have a dimension for the faceplace, anyone have a good method of figuring the length out w/out actually building it? Also..anyone have the idea of the volume of this box? Sorry if I made any mistakes, I feel like **** right now and am on more medicine than I can keep track of. Thanks Jeremy~

2. I always devide the enclosure into as many cubes as I can. from what I see of yours you have 3...

one being the base- 2"tall x 19" long x 19" deep (2 x 19 x19 / 1728 = 0.42)
one being the back- 2"deep x 20" high x 19" deep (2 x 20 x 19 / 1728 = 0.44)
one being the rest- 17"deep x 18" tall x 19" wide
(since this one is really a triangle we'll cut it in half- 17 x 18 x 19 / 1728 = 3.36 / 2 = 1.68)

so now we have 0.42 + 0.44 + 1.68 = 3.68

...Make sence?

3. ## Re: Figuring out missing dimension/volume?

Originally posted by Jdg784
Alright..here's the box I have in mind for my Brahma 15", I designed it base on the space I have leftover from removing part of the backseat in my extended cab F-150. Just realized that I don't have a dimension for the faceplace, anyone have a good method of figuring the length out w/out actually building it? Also..anyone have the idea of the volume of this box? Sorry if I made any mistakes, I feel like **** right now and am on more medicine than I can keep track of. Thanks Jeremy~
looks like someone's missed out on a lot of math classes..

4. Oh yah, the missing length you are looking for should be 24.76"
(17x17=289) + (18x18=324) = 613 sq. rt. of 613=24.76

5. Lol, not a lot of math classes, just a lot of sleep..that mixed w/strong medication. Bronchitis from hell. ..and look at me, still posting away on here..**** car audio addiction, thanks for the help guys.

6. Thanks for the effort trixter..but your volume calculations are off, you accounted for the same area more than once.

8. when doing box stuff i just set out like a sheet of wrapping paper, and it helps a lot to plan things... just a though...

9. good call, never thought about doing that really, I've drawn up plans..but never full size

10. Figures, the hard stuff is easy and the easy stuff is hard...isn't that the way it always goes though?

Is 2.5cu' your target vol.? What is recommended?

11. I didn't have a particular targer volume, but it came out rather well. At 2.54 ft^3 I can run the JBL 1200.1 at 4ohms to break it in..and 2 ohms afterwards. The brahma can easily handle 1200 watts in that box.
Box Size (ft3)
Power
2.85ft ^3
800W

1.89ft ^3
1200W

1.34ft ^3
1800W

1.01ft ^3
2500W

12. Sounds good.

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