Midwest Audio Fest

It’s that time audio enthusiasts! Registration for the 2019 Speaker Design Competition is now open! Visit for details and to list your speaker project. We are excited to see all returning participants, and look forward to meeting some new designers this year, as well! Be sure your plans include a visit to the Parts Express Tent Sale for the lowest prices of the year, and the Audio Swap Meet where you can buy and trade with other audio fans. We hope to see you this summer! Vivian and Jill
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omnimic reading both FR and distortion different today????

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  • omnimic reading both FR and distortion different today????

    So have been using this sytem foir last year and half with no issues. I have been developing a ribbon during this time and have made litteraly hundreds of tests and have been keeping data. Today there is about a 3 db loss in high frequency level at 20khz AND I am measuring about 50% higher distortion below 1khz than I have been measuring on this design for months. It did get very cold in the measurment room the night befor as the heat was accidentally turned off. Room got to around 25 degrees.No todays measurments were not taken t that temp. All was brought up to 73 degrees and allowed 4 hrs to normalize. The measurment mic was in the room when it got tht cold. Is it possable the mic was damaged??

  • #2
    One way to check would be to verify with another driver whose FR and distortion was also measured previously. Do you have such a driver?