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Recent Content by JohnM

  1. JohnM
    Post

    Measurement Setups - Post Your Rig!

    Why the inverse C compensation on your measurements? That would typically only be used when measuring with a C-weighted SPL meter, though if you...
    Post by: JohnM, Mar 12, 2021 in forum: Measurement Setups, Systems, and Standards
  2. JohnM
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    Calibrating MiniDSP EARS Part 2

    I provided some support for EARS in the latest REW build, including allowing different left and right cal files and automatically calibrating the...
    Post by: JohnM, Aug 12, 2019 in forum: Measurement Techniques Discussion
  3. JohnM
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    New way to present distortion

    I have added a distortion graph option to Plot harmonics at the harmonic frequency in REW V5.20 beta 3 if anyone would like to experiment with...
    Post by: JohnM, Jan 3, 2019 in forum: Measurement Techniques Discussion
  4. JohnM
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    New way to present distortion

    Just labelling an axis doesn't work, for percentage figures you need normalised plots. REW gets around that by offering an option for the graph...
    Post by: JohnM, Dec 15, 2018 in forum: Measurement Techniques Discussion
  5. JohnM
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    New way to present distortion

    REW allows the reference for normalisation to be either the excitation frequency or the harmonic frequency, per the distortion graph control...
    Post by: JohnM, Dec 15, 2018 in forum: Measurement Techniques Discussion
  6. JohnM
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    Burst Response! HD800, SR-207, HD650

    That's on the todo list. Choose the option to export the windowed IR and set the left window start where you want the export to start and the...
    Post by: JohnM, Nov 4, 2018 in forum: Measurement Techniques Discussion
  7. JohnM
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    Burst Response! HD800, SR-207, HD650

    The measurement of the LCD-2r2 was taken using a miniDSP EARS rig. I generated a 3 cycle 100Hz sine as a WAV file, then used File -> Import ->...
    Post by: JohnM, Jun 15, 2018 in forum: Measurement Techniques Discussion
  8. JohnM
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    Burst Response! HD800, SR-207, HD650

    You could use this: https://github.com/avaneev/r8brain-free-src
    Post by: JohnM, Jun 14, 2018 in forum: Measurement Techniques Discussion
  9. JohnM
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    Burst Response! HD800, SR-207, HD650

    Looks like fun. Here is a similar thing done with REW's trace arithmetic, also happens to be an LCD-2r2 but measured on EARS. [IMG]
    Post by: JohnM, Jun 14, 2018 in forum: Measurement Techniques Discussion
  10. JohnM
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    Good cheap or free audio test S/W for Mac?

    REW will be getting 24-bit support on MacOS in the next beta release. The Faber Acoustical stuff looks very good though.
    Post by: JohnM, Apr 24, 2018 in forum: Measurement Setups, Systems, and Standards
  11. JohnM
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    Gungnir Multibit wants to kill Kattefjaes in his sleep

    You are making measurements with 2 sweeps. Multiple sweeps requires precise sample clock alignment, you can't usually achieve that when the input...
    Post by: JohnM, Feb 25, 2018 in forum: Audio Science
  12. JohnM
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    Gungnir Multibit wants to kill Kattefjaes in his sleep

    That is caused by some form of monitoring being active, the mixing of the signal and the delayed copy creates that characteristic comb filtering....
    Post by: JohnM, Feb 25, 2018 in forum: Audio Science
  13. JohnM
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    Measurement Setups - Post Your Rig!

    Just posted V5.19 beta 7, that allows up to 501 slices and a variety of colour schemes for the plot. [IMG]
    Post by: JohnM, Oct 1, 2017 in forum: Measurement Setups, Systems, and Standards
  14. JohnM
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    Weird issue with my waterfall plots. USB DAC or MIC related?

    Latency wouldn't usually be an issue with that kind of setup. You can check by looking on the Scope graph after you make a measurement, that graph...
    Post by: JohnM, Aug 3, 2017 in forum: Measurement Techniques Discussion
  15. JohnM
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    Weird issue with my waterfall plots. USB DAC or MIC related?

    REW's sample rate is used for input and output, but it cannot control the rate at which devices actually operate. It asks for lines at the...
    Post by: JohnM, Aug 2, 2017 in forum: Measurement Techniques Discussion