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 14th October 2019, 04:49 PM #1531 SMourareau   diyAudio Member   Join Date: Mar 2010 Location: Paris 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.
 14th October 2019, 07:14 PM #1532 kimmosto   diyAudio Member     Join Date: Oct 2005 Location: Kuopio ^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): 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.
 Today, 03:17 AM #1533 sangram   diyAudio Member   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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Join Date: Jan 2003
Location: Mumbai, India
Quote:
 Originally Posted by sangram 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.
See? This is why you shouldn't bother with measurements. Just use ruthenium plated, titanium dipped speaker cables and the sound will become warm, brilliant, and with superb PRaT, and you'll begin to hear details you never knew existed. Also make sure your speakers are facing the moon when listening to complex passages.

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