View Full Version : Yet Another Box Building Thread

04-18-2012, 07:36 PM
I'm trying to figure this out on my own..forgive me for my misunderstandings.

Respectively, these are my dimensions I've come up with..they are loose, I am just trying to match my Qts accurately.


This is a wedge shaped-sealedbox. D2 obviously being the top depth dimension.

These measurements yield 0.58 cu ft .. which I know is a tad large, but I am compensating for some bracing. Probably going to rip the 3/4 MDF down to 1/2"(as I have a lot of stock to waste) and brace all the seams.

Sub Specifications:

Fs: 25 Hz Magnet weight: 150 oz. SPL: 86 dB 1W/1m Vas: 3.00 cu. ft. Qms: 3.12 Qes: 0.58 Qts: 0.49 Xmax: 14.3 mm Dimensions: Overall diameter: 12-3/8", Cutout diameter: 11-1/8", Depth: 5-3/8"


Dayton Audio RSS315HF-4 12" Reference HF Subwoofer 4 Ohm High Fidelity Reference Series 295-464 (http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-464)

Thanks in Advanced for anyone taking the time to assist me.

04-18-2012, 07:45 PM

04-18-2012, 07:46 PM

Lol..maybe I didn't reveal my question well enough:

Is this size proper?

04-19-2012, 07:04 AM
Shameless bump

04-19-2012, 04:33 PM
lol 150 views and nothing?

Can someone at least tell me I'm on the right path?


05-08-2012, 02:24 PM
What you have is a trapezoid to figure volume for a trapezoid:
First convert all your values to feet by dividing by 12.

volume = L * (b1 + (b2 - b1) * h1 / h + b1) * h1 / 2
In your case here are the values converted:
L= 16 = 1.334
h=14 = 1.167
h1=7 = .583
b1=4 =.333
b2=10 = .833

Google "calculate volume of a trapezoid" enter the values and you get:

.36 cu ft.

Your Vas: 3.00 cu. ft.
This is the size you want your box volume to be
Vas = Volume Air Space

at either .36 or .58 cu. ft. it is to small

I found this site very helpful:

Your dimensions need to be more like
H = 18"
L = 24"
D1 = 8"
D2 = 16"

Were talking a 12" sub here not a 6-1/2" woofer
which is the original dimensions you give for.