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How will removing Ferrofluid from a Celestion CDX14-3050 affect it's response?
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<blockquote data-quote="Mark DeArman" data-source="post: 132869" data-attributes="member: 950"><p>Re: How will removing Ferrofluid from a Celestion CDX14-3050 affect it's response?</p><p></p><p>Art the data is just an excel file. Should be able to open it in any office apps or MATLAB, octave. I can export them to CSV if you would like.</p><p>I repeated the test with a second driver and was surprised to see the same result. I will explain. Lets ignore the giant resonance bump at 10k because that is kind of random between drivers. The common thing, which I did not expect was the undulation at 1k, 2k, 2.5k etc. So it seems the damping provided by the ferro-fluid is helping to keep that in check.</p><p></p><p>What I should do is measure the impedance response on the plane-wave tube to see if that matches up with the bumps and dips which appeared in the frequency response.</p><p></p><p>I know the plot is hard to look at you really need to mentally snip off the data below 500Hz.</p><p></p><p>Another test which might be interesting would be amplitude vs. distortion plot. I'll see if I can grab another fresh driver, hopefully without an issue this time, and try that one.</p><p></p><p>Mark</p></blockquote><p></p>
[QUOTE="Mark DeArman, post: 132869, member: 950"] Re: How will removing Ferrofluid from a Celestion CDX14-3050 affect it's response? Art the data is just an excel file. Should be able to open it in any office apps or MATLAB, octave. I can export them to CSV if you would like. I repeated the test with a second driver and was surprised to see the same result. I will explain. Lets ignore the giant resonance bump at 10k because that is kind of random between drivers. The common thing, which I did not expect was the undulation at 1k, 2k, 2.5k etc. So it seems the damping provided by the ferro-fluid is helping to keep that in check. What I should do is measure the impedance response on the plane-wave tube to see if that matches up with the bumps and dips which appeared in the frequency response. I know the plot is hard to look at you really need to mentally snip off the data below 500Hz. Another test which might be interesting would be amplitude vs. distortion plot. I'll see if I can grab another fresh driver, hopefully without an issue this time, and try that one. Mark [/QUOTE]
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