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icpurplepplalot
01-02-2007, 07:43 PM
Well I need alittle help because this is my first box that I am going to build. I have a design already done, but I was wanting to see from you if yall have one better.
The dimensions I need to stick by are 21'' width by 16'' high and I need 3cubes with a port tuned to 36hz. This is for a 15'' atomic quantum. Any help is much appreciated.

Send To PrinterNet Volume: 3 cubic feet
Tuning Frequency: 43 Hz
Port Width: 2.5 inches
Port Area: 36.25 Square Inches
Port Length: 12.75 inches

External Dimensions: 21 wide x 16 tall x 27.5 deep.
Board Dimensions and Quantity
Color Count Width Height
Top and Bottom 2 21 inches 27.5 inches
Red 1 17.75 inches 14.5 inches
Yellow 1 26.75 inches 14.5 inches
Black 1 19.5 inches 14.5 inches
Green 1 27.5 inches 14.5 inches
Teal 1 10.75 inches 14.5 inches
This is what I got off of the free ported subwoofer plans site, but I wasnt for sure that it was right

j3bus2k3
01-02-2007, 07:45 PM
A.) Why do you want such a high tuning frequency and
B.) You need more port area...

icpurplepplalot
01-02-2007, 07:47 PM
Thats the specs I got from atomic on the quantum, and yeah the port area is one of the things that didnt look right to me. Could you suggest a good tuning. I will probably be running 1200 watts to it if that helps.

Bumpn Focus
01-02-2007, 07:52 PM
I wouldn't tune it above 38hz. More like 34ish.

rpfuror
01-02-2007, 07:59 PM
Something is wrong with that calc: (it ussually is pretty close)

Try something more like this:
Width= 21.00 inches
Height= 16.00 inches
Depth= 26.75 inches
Port Length= 30.95 inches
Slot Vent Width: 3.25 inches
Wood Thickness: 0.75 inches

That would be 3 cu/ft @ 34Hz assuming .10 cu/ft driver displacment.

icpurplepplalot
01-02-2007, 08:01 PM
Sorry, I have never really drawn out plans for anything like this, so how exactly would I go about caculating the dimensions for each piece of the box.

rpfuror
01-02-2007, 09:07 PM
Here you go....

http://i135.photobucket.com/albums/q145/rpfuror/334.jpg

Have fun, put the driver where you want;)

icpurplepplalot
01-02-2007, 09:31 PM
Thanks a bunch!:D