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

manp111 · 06:13 PM

I found the information on a Japanese ALE dealer's website. These parameters did not necessary come from ALE.

Check out this link: http://ns.tachyon.co.jp/~sichoya2/ale/woofer.html

WA-4000 Woofer
Specifications
Diameter: 40cm (TAD1601b compatible),
Bandwidth: 26 to 1KHz,
Impedance: 8 Ohm,
Maxmum Input: 100W,
Output Sound Pressure Level: 98dB,
Magnetic Density: 15,800 gauss,
Weight: 25kg,
Note: alnico magnet,
Made in Japan

WA-4000 T&S parameters
Fs: 34.57Hz
Qms: 5.15
Qes: 0.23
Qts: 0.22
Vas: 33.66(liter)
Re: 5.11(ohm)
Mms: 65.26(g)
Cms: 325(um/N)
Bl: 17.58(T.meter)

What seems strange to me is that how can the Vas be 33.66 liters. That is VERY low. The Cms is also VERY low.
The Fs is 34.57Hz but the specs said the Frequency Response is 26Hz-1000Hz. Is it even possible that the Frequency Response is below the Fs?

Thank you guys in advance.

Man

manp111 · 16th August 2011, 10:07 PM

pictures

tiefbassuebertr · 10:42 PM

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

manp111 · 16th August 2011, 11:18 PM

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.

manp111 · 16th August 2011, 11:27 PM

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

manp111 · 17th August 2011, 02:30 AM

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

Loren42 · 17th August 2011, 02:40 AM

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.

manp111 · 17th August 2011, 03:15 AM

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 · 17th August 2011, 10:33 AM

Quote:

Originally Posted by manp111

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

manp111 · 17th August 2011, 04:03 PM

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.

15th August 2011, 06:11 PM	#1
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	Could you guys help me evaluate ALE Acoustic WA-4000 Woofers Thiele Small Parameters? I found the information on a Japanese ALE dealer's website. These parameters did not necessary come from ALE. Check out this link: http://ns.tachyon.co.jp/~sichoya2/ale/woofer.html WA-4000 Woofer Specifications Diameter: 40cm (TAD1601b compatible), Bandwidth: 26 to 1KHz, Impedance: 8 Ohm, Maxmum Input: 100W, Output Sound Pressure Level: 98dB, Magnetic Density: 15,800 gauss, Weight: 25kg, Note: alnico magnet, Made in Japan WA-4000 T&S parameters Fs: 34.57Hz Qms: 5.15 Qes: 0.23 Qts: 0.22 Vas: 33.66(liter) Re: 5.11(ohm) Mms: 65.26(g) Cms: 325(um/N) Bl: 17.58(T.meter) What seems strange to me is that how can the Vas be 33.66 liters. That is VERY low. The Cms is also VERY low. The Fs is 34.57Hz but the specs said the Frequency Response is 26Hz-1000Hz. Is it even possible that the Frequency Response is below the Fs? Thank you guys in advance. Man Last edited by manp111; 15th August 2011 at 06:13 PM.

16th August 2011, 10:38 PM	#3
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	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 Last edited by tiefbassuebertr; 16th August 2011 at 10:42 PM.

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16th August 2011, 11:18 PM	#4
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	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.

16th August 2011, 11:27 PM	#5
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	Thanks for pointing out the email. I didn't think about email him because he is not the manufacturer. I emailed him.

17th August 2011, 02:30 AM	#6
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	What do you guys think of the Cms? Can the Cms be 325 micro meter?

17th August 2011, 02:40 AM	#7
Loren42 diyAudio Member Join Date: Sep 2008 Location: "Space Coast" Florida, USA	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.

17th August 2011, 03:15 AM	#8
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	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.

17th August 2011, 04:03 PM	#10
manp111 diyAudio Member Join Date: Jun 2010 Location: Austin, Texas	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.

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