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Headphone CSD waterfall plots

Discussion in 'Headphones (full-size)' started by purrin, Aug 13, 2011.
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  1. arnaud Contributor
    Purrin, very nice!! The sr80 mod is interesting. I need to check these mod threads...

    From back of the hand calculation the 2kHz peak is likely the first 1/4 wavelength resonance of the undamped back chamber. Some foam in there, esp. At the grill location should help a lot. 

    On the other hand, I don't see how the rs models can sound better given the same basic design unless the driver is somehow tuned to alleviate such acoustic res. Or maybe the chamber is quite different dimensions, but still these undamped modes and bound to occur above 2k, regardless of the shape...
  2. purrin
    The RS1 cups are a different dimension. The RS2 cups are the same or similar. A few years ago, I noted a similar peak ~2kHz in my RS2 FR measurement (the RS1 didn't have this peak.) You can hear it too as kind of a "honk" in the midrange. It's possible the driver may contribute too.
    At this point, I'm just happy how the foam is really helping with damping down the ringing on the HD800.
  3. arnaud Contributor
    Thought I'd post an update here as well:
    1) the original script no longer requires matlab and runs on free software scilab:
  4. arnaud Contributor
    Also, for those who got some data and would like to use Excel to check these CSDs, I made a spreadsheet with a macro to calculate the ffts (you need to enable macro and load the analysis toolpack).
    Not as clean as scilab but probably more convenient:
    Excel_CSD2_3D_5ms.png Excel_CSD1_3D_3ms.png
    PS: many many thanks again to Purrin for letting me play with his data!
  5. purrin
    Nice one. I didn't know Excel came with an FFT function.
  6. cappellano
    WOW! Nice work! It would be interesting to see these measurements for other headphone as well!!!!
  7. Anaxilus
    Very nice work arnaud!
  8. arnaud Contributor
    Thanks all, credit all goes to Purrin for taking such clean data and Tyll Hertsen for pointing me to Excel :wink:.
    I will process a few other cans that Purrin sent me the data for. Also, I have corrected the SPL scale, the Excel graphs above are not properly normalized...
  9. purrin
    I re-did the SET1 and SET2 measurements. The new plots use the same data, but presented more correctly. The original plots were on based on acoustical pressure in pascals instead of being converted into decibels. The new plots are interpolated between the data points and have tick marks on the axes.
    Here is a "perfect" (well not actually perfect, but an electrical loopback of the impulse response) to give us an idea how far off the ideal these headphone drivers are.
    I'm be posting another set of a few more other headphones soon.
  10. arnaud Contributor
    Marv, your custom made graphs look very professional, esp. the detail of the settings in the upper left corner! Somehow, I got a nagging feeling you got a bit inspired by Clio, didn't you? :wink:.
    I am not sure it's appropriate for me to post the same data processed in Excel as it feels like a contest, but I was requested by someone earlier... Only added the HP1000 as I felt compelling to compare it to the HF2. Is that just me or the HF2 is a naughty in the 2D view, as if it got irritated that I show it in that light :wink:
  11. purrin

    Yup :) But honestly, I like that information there so I can look back and know what I did. I also need to keep up with you since you keep pulling rabbits out of your hat - like doing CSDs with Excel.
  12. purrin

    Set 3

    Fostex T50RP and Sony MDR-SA5000

    Fostex T50RP Left and Right

      T50rpL.txt.jpg   T50rpR.txt.jpg

    Sony SA5000

    sa5000.txt.jpg   SA5000R.txt.jpg
  13. purrin

    Set 4

    Six different HP1000 drivers on same pad.
    KEL and KER have the best response. ISL and ISR are badly matched on the same headphone.
    HP1000ISL.txt.jpg   HP1000ISR.txt.jpg
    HP1000KEL.txt.jpg   HP1000KER.txt.jpg
    HP1000.txt.jpg   HP1000RVR2.txt.jpg
  14. arnaud Contributor


    hahaha, you win purrin I can't keep up with the volume of data you're generating :wink:. Glad the issues with Clio got circumvented with your home-brew!
  15. purrin

    Set 5:

    Koss ESP950 (electrostats), Sennheiser HD558, Sony XB500 XB700


    Sony XB500 XB700

    Always good to test something you know will suck to validate these measurements.

    Sennheiser HD558 with the 598 mod

    Not bad.

    Koss ESP950

    Smooth FR. Fast decay from 2.5kHz upward with spurious ringing. I really like how these headphones sound.
    ESP950LKossEnergizer.txt.jpg   ESP950RKossEnergizer.txt.jpg
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