Advice on characterizing microphones

Discussion in 'Official REW (Room EQ Wizard) Support Forum' started by emw, Jan 10, 2018.

  1. emw

    emw New Member
    Thread Starter

    Jan 8, 2018
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    I was wanting to do some rough frequency response characterization of some microphone / preamp / soundcard combinations. I am not worried about phase at all just relative frequency responses. Ideally I want to characterize it between 5Khz and 24Khz, but would be happy with 10K to 20K.

    I plan on getting a speaker with a relatively flat response from 10K to 20K playing white noise, measure the frequency response using REW RTA with a UMM-6 microphone. I would then repeat this process with a microphone on a sound card, take the difference (division?) of the results using REW and have a frequency response curve.

    I expect it will have some wild results at the very top end, but will this work? Is there a better way to do this? Should I be using stepped sine instead?
    #1 emw, Jan 10, 2018
    Last edited: Jan 11, 2018
  2. Wayne A. Pflughaupt

    Staff Member

    May 21, 2017
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    Corpus Christi, TX
    Don’t see any reason why the idea wouldn’t work, as long as your UMM-6 has a calibration file. You’ll have your baseline measurement with the calibrated mic and flat speaker, so it’ll be able to identify any differences subsequent equipment displays

    For the record, the calibration file that one that comes with the UMM-6 mic is trash. You’ll want a calibration from a lab like Cross Spectrum if you need a truly flat baseline reference.


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