Could you guys help me evaluate ALE Acoustic WA-4000 Woofers Thiele Small Parameters?

[HP8903B]

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[HP8903B]

pictures

 

[tiefbassuebertr]

For me clearly a missprint. This value for VAS seems to be cubic feed instead liters (multiply the value by 28). That means 900 liters instead 33 liters.
What actually the manufacturer says to that value?
Have you already ask there?
e-mail is follow:
jack@mtc.biglobe.ne.jp

 

[HP8903B]

That is a valid point.

It is a Japanese manufacture so I think it uses metric.
The Vas could be 336.6 liters instead.

The Cms doesn't seem right either.

 

[HP8903B]

Thanks for pointing out the email. I didn't think about email him because he is not the manufacturer. I emailed him.

 

[HP8903B]

What do you guys think of the Cms? Can the Cms be 325 micro meter?

 

[Loren42]

Why not measure it (the T/S parameters) yourself?
[p]
Chances are the manufacture's published numbers are not that close to the actual numbers anyway.

 

[HP8903B]

I don't know how to measure. Plus I am kinda lazy.
I might have to learn if I can't sort out the given figures.

 

[Loren42]

I don't know how to measure. Plus I am kinda lazy.
I might have to learn if I can't sort out the given figures.

Well, if your serious about getting the data, then you really have to measure the drivers.

Vance Dickason's The Loudspeaker Cookbook is an excellent resource on how to do this with a minimum of tools.

Parts Express sells the WT3 woofer tester that does this in an automated fashion for about $100. There are other tools like Liberty Instrument's Praxis that can be free if run in Demo mode. Praxis will measure T/S parameters with a minimum of invested hardware.

Liberty Instruments, Inc. Home Page

 

[HP8903B]

Thanks for the information. I will looking into it.

I am just trying to figure the box size and it seems like the Vas is necessary.

 

[Loren42]

Thanks for the information. I will looking into it.

I am just trying to figure the box size and it seems like the Vas is necessary.

Yes, you are correct. Your best bet is to either measure it for yourself or maybe someone local to you can do that for you.