SBAF GitHub: Headphone Frequency Response Data

Discussion in 'Audio Science' started by purr1n, Aug 2, 2020.

  1. Biodegraded

    Biodegraded Friend

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    Data request: @purr1n could you share the compensation file(s) for the flat-plate coupler? That'd help people with similar couplers calibrate their raw results to yours and make their own compensations.
     
  2. purr1n

    purr1n Finding his inner redneck

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    Photo of flat plate coupler. Obviously the Lego pieces are not supposed to be there and only added for perspective on the size of the felt overlay that goes on top on the Creatology foam.

    IMG_20200821_111911.jpg

    Compensation to be "comparable" back to EARS32, I first standard with B&K AES1970 type compensation and worked backwards comparing to datasets where I had both EARS and FPC measurements. It's not perfect, but the results "average" out over a dozen or so headphones. I will be adding a large set of FPC measurements, so if you wanted to do some data analysis, you can do so yourself. For now the FPC2.1 is the best that I have.

    Also very important to note that this compensation is based on my particular Dayton UMM-6 USB microphone.

    SBAF FPC 2.1 Compensation

    Freq Adj

    1.00 0.00
    5.00 0.00
    10.00 0.00
    15.00 0.00
    17.00 0.00
    19.00 0.00
    20.00 0.00
    28.28 0.00
    40.00 0.00
    56.57 0.00
    80.00 0.00
    113.14 0.00
    160.00 0.00
    226.27 -0.50
    320.00 -1.00
    452.55 -1.50
    640.00 -2.00
    905.10 -1.75
    1280.00 -2.00
    1810.19 -2.75
    2560.00 -3.50
    3620.39 -4.00
    5120.00 -4.00
    6000.00 -2.00
    7240.77 -5.00
    10240.00 -5.00
    14481.55 -9.50
    20480.00 -8.00
    21000.00 -8.00
     
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  3. purr1n

    purr1n Finding his inner redneck

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    FYI, I've uploaded a ton of compensated FPC data to http://hpdb.io from the past three years. There is some scattered stuff from Audeze, Drop, Grado and others I'll need to add. Also want to up a fresh HD6XX. Then I'll go back in time to add more from Changstar prior years' "V2" = FPC.
     
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  4. Bill-P

    Bill-P Level 42 Mad Wizard

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    Just FYI, I just changed the default window of my online chart tool thingy so now it'll show 0-line (no offset) by default.

    So, to use the tool, you can just download one of the measurements in the Github repository, add it, and enjoy! No need to add +90dB offset anymore.

    I'll spend some more time this weekend to clean up the source code and make it more readable.

    P.S.: if you're not seeing the new default -50 -> 20dB window, please empty your browser cache!
     
  5. JellyRhino

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    Thank you for sharing this database! BTW, Atticus and Auteur FPC measurements don't seem to display properly.
     
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  6. purr1n

    purr1n Finding his inner redneck

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    Thanks for QC! FIxed now.
     
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  7. purr1n

    purr1n Finding his inner redneck

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    I've uploaded the remaining datasets. There should be 60+ headphones FR up there. I'll look for stragglers (files) and upload when I see them. HD6XX is still missing, working on fresh measurement for it.

    In the meantime, while I was uploading, I found a cheap closed headphone of interest. It's not the most resolving, but closed headphones with decent FR are rare. I had forgotten about this one.

    http://billp.site/projects/chart-tool/
    upload_2020-8-22_14-9-44.png

    Also new FPC measurements, now compensated, better illustrate why I always had some sort of issue with HFM headphones' frequency response unless mods were applied.
    upload_2020-8-22_14-13-8.png
     
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