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<blockquote data-quote="squeak9798" data-source="post: 3748750" data-attributes="member: 555320">Since Neil hasn&#039;t responded to this thread yet, suppose I&#039;ll try to be of assistance here.Cms, as Neil previously mentioned, is the speaker&#039;s compliance (opposite of stiffness) and is the parameter that is going to change (increase) as a result of &quot;break in&quot; and the driver&#039;s suspension loosening up.The change in Vas can be found by;Vas = p * c^2 * Sd^2 * CmsI&#039;m not going to work out this one as the change is rather obvious.&nbsp; You can see that if Cms increases, Vas is going to increase proportionally....if Cms doubles, Vas will double.Change in Fs can be found as follows;Fs = [6.28*(Cms*Mms)^.5]^-1So to take an example here, lets look at the Soundsplinter Rl-p;Fs = [6.28*(.0002592*.1779)^.5]^-1 = 23.4 hzNow let&#039;s look at what happens if Cms (compliance) increases...to make life easy lets just double the current Cms;Fs = [6.28*(.0005184*.1779)^.5]^-1 = 16.6 hzYou can see that by doubling Cms, Fs decreased a considerable amount.For Qes;Qes = 2pi*Fs*Mms*Re/Bl^2You can see that since Fs is in the numerator, if Fs decreases Qes is likewise going to decrease.Qms = 2pi*Fs*Mms/RmsAs above, if Fs decreases Qms is going to likewise decrease.And since Qts = Qms*Qes/Qms + Qes you can gather that if both Qes and Qms decrease, total driver Q (Qts) is going to likewise decrease.And yes, I got lazy and didn&#039;t work out any of the other parameters besides Fs //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif&nbsp; But I wanted to work out Fs to show you how it changed since it affected Qes and Qms, and ultimately Qts.&nbsp; If you wanted to work them out yourself, the only parameter missing from most T/S lists is Rms which can be worked back out of the stated Qms figure as long as Mms is given.</blockquote>

[QUOTE="squeak9798, post: 3748750, member: 555320"] Since Neil hasn't responded to this thread yet, suppose I'll try to be of assistance here. Cms, as Neil previously mentioned, is the speaker's compliance (opposite of stiffness) and is the parameter that is going to change (increase) as a result of "break in" and the driver's suspension loosening up. The change in Vas can be found by; Vas = p * c^2 * Sd^2 * Cms I'm not going to work out this one as the change is rather obvious. You can see that if Cms increases, Vas is going to increase proportionally....if Cms doubles, Vas will double. Change in Fs can be found as follows; Fs = [6.28*(Cms*Mms)^.5]^-1 So to take an example here, lets look at the Soundsplinter Rl-p; Fs = [6.28*(.0002592*.1779)^.5]^-1 = 23.4 hz Now let's look at what happens if Cms (compliance) increases...to make life easy lets just double the current Cms; Fs = [6.28*(.0005184*.1779)^.5]^-1 = 16.6 hz You can see that by doubling Cms, Fs decreased a considerable amount. For Qes; Qes = 2pi*Fs*Mms*Re/Bl^2 You can see that since Fs is in the numerator, if Fs decreases Qes is likewise going to decrease. Qms = 2pi*Fs*Mms/Rms As above, if Fs decreases Qms is going to likewise decrease. And since Qts = Qms*Qes/Qms + Qes you can gather that if both Qes and Qms decrease, total driver Q (Qts) is going to likewise decrease. And yes, I got lazy and didn't work out any of the other parameters besides Fs [IMG]//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif[/IMG] But I wanted to work out Fs to show you how it changed since it affected Qes and Qms, and ultimately Qts. If you wanted to work them out yourself, the only parameter missing from most T/S lists is Rms which can be worked back out of the stated Qms figure as long as Mms is given. [/QUOTE]

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