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Old 28th April 2011, 02:50 AM   #1
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Question Thiele Small Parameters - Infinity Kappa Perfect

Hi all,

I'm new to designing enclosures and have recently purchased the Infinity Kappa Perfect 6.1 component set. I'd like to build a custom kickpanel enclosure for my Civic, but I'm confused on the T/S parameters since the units of measure (mm^3, in^3, watts, etc.) aren't listed in the users' manual and I don't know if I'm entering them correctly in WinISD.

Can someone please tell me what the units of measure are for the woofer's parameters? I've attached the parameters as an image for convenience. Also, are the units of measure that you're providing "industry standard" if the units are left out?

Thank you in advance!
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Old 28th April 2011, 11:50 AM   #2
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Quote:
Originally Posted by gwolfman View Post
Hi all,

I'm new to designing enclosures and have recently purchased the Infinity Kappa Perfect 6.1 component set. I'd like to build a custom kickpanel enclosure for my Civic, but I'm confused on the T/S parameters since the units of measure (mm^3, in^3, watts, etc.) aren't listed in the users' manual and I don't know if I'm entering them correctly in WinISD.

Can someone please tell me what the units of measure are for the woofer's parameters? I've attached the parameters as an image for convenience. Also, are the units of measure that you're providing "industry standard" if the units are left out?

Thank you in advance!
You are right the units should always be present. That's a big mistake. Usually that's because the factory/users are local. So if you are in a country use their standard and guess the technical others. Anyway I can see that some units are (Imperial and Metric) present.

Last edited by Inductor; 28th April 2011 at 11:52 AM.
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Old 28th April 2011, 05:47 PM   #3
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Right now I'm looking at the specs for a 8" woofer [click here] they have for comparison. Can I assume the units are the same? Basically this is what they show for the 8" (asterisks are added where I have questions):

Revc (ohms)
*Levc (mH)
*Sd (in^2 and cm^2)
Bl (TM)
*Vas (ft^3 and liters)
Cms (um/N)
Mms (g)
Mmd (g)
Fs (Hz)

Everything seems to match up except:
-Can the Levc be 10x smaller on the 6 1/2 than the 8 (0.37 vs 3.7)?

-The Sd for the 6 1/2 is way smaller (0.0113 vs [216cm^2 or 33.33in^2]). Multiplying 0.0113 by 1,000 (to convert liters to cm^2) only gives me 11.3cm^2 which I'm not sure is right (113cm^2 seems right to me) but seems a lot better than converting it to 1.63in^2.

-The Vas for the 6 1/2 says 11.43 and the 8" shows 1.43ft^3 and 33.72liters. It looks safe to assume the 11.43 is liters, right?

-Are Qms, Qes, Qts universal measurements?


Also, 2 more question:
1) Are any of those the woofer's displacement? I'm either a n00b and don't understand the parameters or I'm very surprised they missed that one.

2) Is the SPL entry in WinISD for the sensitivity of the speaker?

Thanks again in advance.
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Old 28th April 2011, 06:10 PM   #4
GM is offline GM  United States
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Greets!

Revc = 3.45 ohms
Levc = 0.37 mH
Sd = 0.0113 m = 113 cm^2
BL = 6.37 N/A
Vas = 11.43 L
Cms = 630.36 um/N = 6.3036e-04 mm/N
Mms = 18.94 gr
Mmd = 18.25 gr
Fs = 46.05 Hz
Qms = 3.44
Qes = 0.465
Qts = 0.41

GM
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Last edited by GM; 28th April 2011 at 06:25 PM.
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Old 28th April 2011, 06:16 PM   #5
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Quote:
Originally Posted by GM View Post
Greets!

Revc = 3.45 ohms
Levc = 0.37 mH
Sd = 0.0113 m = 113 cm^2
BL = 6.37 N/A
Vas = 11.43 L
Cms = 630.36 ?/N = 6.3036e-04 mm/N
Mms = 18.94 gr
Mmd = 18.25 gr
Fs = 46.05 Hz
Qms = 3.44
Qes = 0.465
Qts = 0.41

GM
Thanks for clarifying those numbers for me!

Anyone that can answer the last two questions:
Quote:
Originally Posted by gwolfman View Post
1) Are any of those the woofer's displacement? I'm either a n00b and don't understand the parameters or I'm very surprised they missed that one.

2) Is the SPL entry in WinISD for the sensitivity of the speaker?
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Old 28th April 2011, 07:06 PM   #6
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You're welcome!

No.

Yes, but it auto calculates it, at least the pro alpha version does. Regardless, manufacturers historically have been notorious for listing the highest peak which often isn't even in its usable pass-band [shades of the muscle car era's horsepower 'wars' ], so meaningless for the most part whereas the calculation using T/S specs is more accurate overall.

GM
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Old 28th April 2011, 09:35 PM   #7
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Thank a bunch!

Now how do I mark this thread as answered.... ?
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Old 28th April 2011, 10:01 PM   #8
GM is offline GM  United States
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You're welcome!

Didn't know we could...........

GM
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Old 28th April 2011, 10:35 PM   #9
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Some forums have that feature, but I can't find it here. Anyways, thanks for the help.
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