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Old 14th October 2019, 04:49 PM   #1531
SMourareau is offline SMourareau  France
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Join Date: Mar 2010
Location: Paris
Default USPL=SPL+10*log(8/Re)

I kimmosto,

After thinking a little on the subject. I found out why the
USPL is different and probably for the same reason why the frequency response in Enclosure analysis is a too high for a given input voltage.

The formula that you use : USPL=SPL+10*log(8/Re) hasn't a lot of physical meaning while the 8 is a completely conventional value.

May be it could be usefull to compute USPL and frequency reponse, to use cone motion and some aproximation of its radiation impedance.
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Old 14th October 2019, 07:14 PM   #1532
kimmosto is offline kimmosto  Finland
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^8 is conventional because it represents 2.83V in the formula i.e. in definition of USPL.

Anyway, Scan-Speak's web site has massive toolbox including single Excel file: VENTED-FDD.0.96.US_EN.zip

If you enter equal parameters to both VCAD Enclosure tool and S-S's Excel, you will get about 0.2 dB difference (black=VCAD, gold=S-S):
Click the image to open in full size.

Excel file searches maximum USPL=88.01 dB @ 104 Hz from frequency response. USPL would be 88.77 dB/2.83V/1m without effect of lossy inductance with extended impedance model.

I'm not so keen to make any fancier than they and most of the other tools have.
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Old Today, 03:17 AM   #1533
sangram is offline sangram  India
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Join Date: Sep 2002
Location: India
Hello

Bug report:

In calculator when trying to remove an imported response from the A responses list, program crashes with errors - still allows to save but quits immediately after.

Apologies if this has been mentioned before.
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Old Today, 05:19 AM   #1534
tcpip is offline tcpip  India
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Join Date: Jan 2003
Location: Mumbai, India
Quote:
Originally Posted by sangram View Post
Hello

Bug report:

In calculator when trying to remove an imported response from the A responses list, program crashes with errors - still allows to save but quits immediately after.

Apologies if this has been mentioned before.
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Good to see you here.
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