Vb Calc Empty/Fill?

[WHAAAAAAT?]

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.

[Jimi77]

Ported or sealed?

Adding fill makes a smaller box act like a bigger box.

[WHAAAAAAT?]

Originally Posted by Jimi77 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.

[Jimi77]

Originally Posted by WHAAAAAAT? 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.