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Subwoofer Box Design - do proportions make a differene lwh?

 

Bronze Member
Username: Ornlu

Post Number: 22
Registered: Apr-04
Hi, I'm rebuilding a subwoofer box for home usage. I used a program called AJ Sealed Designer 2 and it at first suggested a rediculous 12 cubic foot box for the 10 inch sub I'm using... wow... So I instead plugged in the volume suggested on the maker's website 1.65 cubic feet. And got some weird proportions.. really wide, shallow and fairly tall. (it's a phoenix gold sub, Xenon x10d2).

My question is, do the proportions of a box make a difference? I'd want to make it as cubic as possible just so that I can A) take up the least space B) use less wood C) have better internal support.

They said something about the strange proportions being ideal for resonance bla bla bla...

Also, my other question is, should I go with the sealed volume suggested by the retailer (it's a car sub) or should I go with a larger volume as per the suggesion by the box designer? i obviously won't be going with the rediculous size suggested, but, perhaps the 1.65 cubic foot design suggested by the retailer is better for car usage than home usage?

The TS parameters of the driver are as follows.

T/S Parameters
Fs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.78 Hz
Re . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.11 Ohms (Series)
Qms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.62
Qes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.76
Qts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.68
Vas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.44 liters
Mms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277.65 grams
Cms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 uM/Newton
BL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15.90 Tesla-M
SPL (2.83v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 dB
Sd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346.4 sq cm
Xmax (measured) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40mm p-p
Vdd - Driver Displacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.122ft3

Thanks for any help you can provide.
 

Unregistered guest
it's always best to go with the size suggested by the people who made the subwoofer.

but, there are some things you'll need to consider.
first, the mounting depth of the speaker. which means how tall the speaker if whenever it sits on the magnet. therefore.. the height of the box, needs to be atleast 1in greater than that.. to allow ample air flow behind the sub. This keeps the subwoofer cool while working, and allows the subwoofer to play more freely.
Then.. since the subwoofer is a 10, you need to find the mounting hole measurement. Then add atleast 1-2in for plenty of room around the sub to screw it in securely.

Now for some tips:
1: try and keep the subwoofer in the middle of the box. This means, don't have a 10in subwoofer sitting on the far left/right side of a 30in wide box. The sub doesn't get as much of a chance to use all the air than if it were in the center.
2: Try and keep the mass of the air around the speaker, especially behind it. This allows for, as i said earlier, better cooling of the speaker, and gives the subwoofer more air to use, and makes the air it uses, easier to access.


Also, just incase you don't know, when working with inches and trying to get the cubic feet for a box.
Xin(L) * Xin(H) * Xin(W) = Xin / 1728 = Xc.f.

_______________________



I hope all of this helps you, and I'm sorry for the late reply but I just happen to run upon this post through a search engine while trying to look for something else. If you have any question, email me @ nole2@cox.net
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