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Headphone CSD waterfall plots

Discussion in 'Headphones (full-size)' started by purrin, Aug 13, 2011.
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  1. jerg Contributor
    Maybe try to re-measure a few sets of data, each with some minor variations in the earcup placement on your measuring instrument? That could uncover what is causing this.
     
  2. vid
    Quote:
     
    Artificial ear and ear canal leading to an electret capsule mic. An MLS signal.
     
    Quote:
     
    I'll see about doing it later today.
     
  3. stv014
    Using the programs from dsputils.zip (see description here), I have created a script for a fairly complete set of headphone measurements. I am not sure if anyone finds this useful, though, since the user friendliness and the documentation are lacking, but maybe someone will find it interesting:
      hptest.zip
     
    It uses the following input files:
    - the test signals recorded from the headphone (the test does take a few minutes, so the sample could be optimized for shorter length). resample.txt needs to be set up with the correct start time and gain parameters so that the 1 kHz tone at the beginning of the file starts at exactly 1 second, and has an amplitude of 0 dBFS
    - the impedance test file (a loopback recording using a device with a known resistive output impedance; the test signal consists of two MLS loops, the headphone load needs to be connected during the second one)
    - global equalization IR file (it is applied to all measurements)
    - frequency response equalization IR file (it is only applied to the FR graph)
     
    The graphs created include:
    - frequency response (from impulse response, equalized; it does not average the response from multiple positions, though, which would be a useful feature)
    - CSD (left and right channel)
    - 500 Hz THD spectrum at 90 and 100 dB SPL (note: for the SPL values to be correct, the test file should be played at a volume setting at which 0 dBFS = 105 dB SPL - the drivers need to be able to handle this, and a long sine sweep at 100 dB)
    - 55 Hz + 2000 Hz 4:1 IMD spectrum at 90 and 100 dB SPL
    - 15000 + 16000 Hz 1:1 IMD spectrum at 90 and 100 dB SPL
    - THD vs. frequency at 90 and 100 dB SPL
    - THD vs. level at 50 Hz, from 80 to 105 dB SPL
    - group delay
    - impedance vs. frequency
     
    The package also contains some sample graphs. However, since I did not use a high quality microphone and dummy head or artificial ear, these are not particularly accurate, and are really only examples.
     
    ultrabike likes this.
  4. vid
    Beyer DT 100 (400-ohm)
     
    beyer_dt100.png
     
    Measured without the artificial ear, but it looks close enough to the Golden Ears measurement and seems about what I hear.
     
    Some actually do call these headphones neutral and accurate.
     
  5. Reticuli2
    Anyone have an REW measurement response file for the HD25 they could send me?  I want to do a parametric eq on it.
     
  6. jiiteepee
    Can you use these curves:
     
    http://graphs.headphone.com/graphCompare.php?graphType=0&graphID[]=513&graphID[]=523&scale=20
     

     
    http://jiiteepee.tripod.com/peqgui-10mc.html (read the documentation)
     
    It's not perfect way but ...
     
  7. purrin
     
    Do you mean you want an impulse response file?
     
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