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Message: <blockquote data-quote="Jeffdachef" data-source="post: 8578349" data-attributes="member: 650438">the red line means 0 db  more than this is a more emphasized response on the frequencies that are above it.   purple line is -3db when you start falling off below tuning and its a sharp drop of output from there.  Your curve by the red line looks perfectly fine. It doesnt have to be a straight line.  Just know that a flat curve is not the loudest its just the smoothest and flattest sounding which means it gives up some output mainly losing the peakiness.check rear air velocity and see if you are under the proper figures.</blockquote>

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