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Recent Content by JohnM

  1. JohnM
    Post

    Oh shit! SINAD can suck my ****s

    That's more or less it, but the electrical impedance above the bass range isn't well modelled without some extra components. This is a slightly...
    Post by: JohnM, Jul 9, 2021 in forum: Measurement Techniques Discussion
  2. JohnM
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    ASIO4ALL no devices?

    FlexASIO is an alternative wrapper to try if ASIO4All isn't cooperating, https://github.com/dechamps/FlexASIO
    Post by: JohnM, Jul 6, 2021 in forum: Measurement Setups, Systems, and Standards
  3. JohnM
    Post

    Oh shit! SINAD can suck my ****s

    It may be worth trying a much shorter cable from the amp to the breakout board, the impedance of that connection will make a difference to the...
    Post by: JohnM, Jul 6, 2021 in forum: Measurement Techniques Discussion
  4. JohnM
    Post

    Oh shit! SINAD can suck my ****s

    John Yang has posted some measurements of L30 with HD650 as the load that don't show the same behaviour. From the image the analyser is connected...
    Post by: JohnM, Jul 5, 2021 in forum: Measurement Techniques Discussion
  5. JohnM
    Post

    Oh shit! SINAD can suck my ****s

    That's the problem with using a distorting load. Any amplifier output impedance forms a simple divider between the amplifier and its relatively...
    Post by: JohnM, Jul 4, 2021 in forum: Measurement Techniques Discussion
  6. JohnM
    Post

    Oh shit! SINAD can suck my ****s

    Might be worth establishing whether you are measuring the behaviour of the amplifier or of the load. Perhaps try a measurement of the Jotunheim 1...
    Post by: JohnM, Jul 4, 2021 in forum: Measurement Techniques Discussion
  7. JohnM
    Post

    Oh shit! SINAD can suck my ****s

    It may be worth looking at the distortion the headphone is producing with the different amplifiers and whether it is at all different. The output...
    Post by: JohnM, Jul 3, 2021 in forum: Measurement Techniques Discussion
  8. 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
  9. 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
  10. 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
  11. JohnM
    Post

    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
  12. JohnM
    Post

    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
  13. JohnM
    Post

    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
  14. 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
  15. JohnM
    Post

    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