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<blockquote data-quote="squeak9798" data-source="post: 2014604" data-attributes="member: 555320">SPL = 112+10*log(9.64*10^(-10)*Fs^3*(Vas/Qes))For the 12&quot; dual 4:SPL = 112+10*log(9.64*10^(-10)*18.856^3*(142.7/.242)) = 87.81dbRated sensitivity is 87.79db.02db is not &quot;way off&quot;For the 15&quot; d4:SPL = 112+10*log(9.64*10^(-10)*27.487^3*(148.8/.508)) = 89.68dbRated sensitivity is 89.67db..01db difference is not &quot;way off&quot;The D2&#039;s for both models are just as close...within .02db of the rated sensitivity.Seems to me that someone must be doing the calculations improperly //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifBut no, the Rl-ps do not model well in enclosure design programs.&nbsp; This is one example of how paper and real world do not always agree.&nbsp; The 15&#039;s will hit very low in a sealed enclosure.</blockquote>

[QUOTE="squeak9798, post: 2014604, member: 555320"] SPL = 112+10*log(9.64*10^(-10)*Fs^3*(Vas/Qes)) For the 12" dual 4: SPL = 112+10*log(9.64*10^(-10)*18.856^3*(142.7/.242)) = 87.81db Rated sensitivity is 87.79db .02db is not "way off" For the 15" d4: SPL = 112+10*log(9.64*10^(-10)*27.487^3*(148.8/.508)) = 89.68db Rated sensitivity is 89.67db. .01db difference is not "way off" The D2's for both models are just as close...within .02db of the rated sensitivity. Seems to me that someone must be doing the calculations improperly [IMG]//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif[/IMG] But no, the Rl-ps do not model well in enclosure design programs. This is one example of how paper and real world do not always agree. The 15's will hit very low in a sealed enclosure. [/QUOTE]

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