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Old 03-20-2018, 09:34 PM   #1
WHAAAAAAT?

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Vb Calc Empty/Fill?

Hi all,

When calculating Vb I have a couple questions.

1. does adding fill allow for a smaller box? IE: Speaker "A" requires a 34Hz tune, 1.75cf volume empty but only 1.4 with fill.
2. Does that mean I use a 1.75cf enclosure and fill it reducing volume to 1.4cf? or do I use a 1.4cf box and line it with fiberglass sheeting or polyester batting?
3. if a 12" box is tuned to 34Hz will any 12" speaker work in it that require a 34Hz tune given they are close in displacement volume?


Cheers.

Last edited by WHAAAAAAT?; 03-20-2018 at 09:51 PM.
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Old 03-20-2018, 10:24 PM   #2
Jimi77

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Ported or sealed?

Adding fill makes a smaller box act like a bigger box.
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Old 03-21-2018, 05:56 AM   #3
WHAAAAAAT?

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Quote:
Originally Posted by Jimi77 View Post
Ported or sealed?

Adding fill makes a smaller box act like a bigger box.
Is there a difference if it is ported or sealed? I would think if filler made any difference it would be for both.

In my case though, ported.
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Old 03-21-2018, 01:05 PM   #4
Jimi77

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Quote:
Originally Posted by WHAAAAAAT? View Post
Is there a difference if it is ported or sealed? I would think if filler made any difference it would be for both.

In my case though, ported.
Filler makes the same difference in both - the box acts like it's bigger. However, in a sealed application, filler will make f3 drop. In a ported application, the filler will raise the F3 and FB unless you add length to the port.
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