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<blockquote data-quote="squeak9798" data-source="post: 3268485" data-attributes="member: 555320">The THD curves are the green, blue, purple and gray lines.The key in the upper left hand corner indicates which color represents what harmonic.So, given the key....the red response is the &quot;fundamental&quot;, or the original signal.&nbsp; The green line is the second order harmonic distortion.&nbsp; The blue line is the 3rd order harmonic distortion, followed with purple being the 4th order and gray the 5th order harmonic distortion.As Thad correctly pointed out, the -40db mark is the 1% THD level and -50db is ~ .3% THD.Given all of the data is below the -40db line, it indicates that the distortion for every harmonic is below 1% THD at the power/output level of the test.I saw your unedited posts asking if the driver had 200% distortion or was producing 200db since the harmonics were at -50db (which is about .3% THD, not 200% [not sure how you arrived at that figure])......for future reference, here is a simple calculator that converts the db to THD % for you;<a href="http://www.sengpielaudio.com/calculator-thd.htm" target="_blank">http://www.sengpielaudio.com/calculator-thd.htm</a></blockquote>

[QUOTE="squeak9798, post: 3268485, member: 555320"] The THD curves are the green, blue, purple and gray lines. The key in the upper left hand corner indicates which color represents what harmonic. So, given the key....the red response is the "fundamental", or the original signal. The green line is the second order harmonic distortion. The blue line is the 3rd order harmonic distortion, followed with purple being the 4th order and gray the 5th order harmonic distortion. As Thad correctly pointed out, the -40db mark is the 1% THD level and -50db is ~ .3% THD. Given all of the data is below the -40db line, it indicates that the distortion for every harmonic is below 1% THD at the power/output level of the test. I saw your unedited posts asking if the driver had 200% distortion or was producing 200db since the harmonics were at -50db (which is about .3% THD, not 200% [not sure how you arrived at that figure])......for future reference, here is a simple calculator that converts the db to THD % for you; [URL="http://www.sengpielaudio.com/calculator-thd.htm"]http://www.sengpielaudio.com/calculator-thd.htm[/URL] [/QUOTE]

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