Measurement Setups - Post Your Rig!

Discussion in 'Measurement Setups, Systems, and Standards' started by Luckbad, Oct 5, 2015.

  1. Luckbad

    Luckbad Traded in a unicorn for a Corolla

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    Beautiful rig!
     
  2. logscool

    logscool Friend

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    Wow that is great I love the very professional but still fun looking cardboard setup. I have also been playing with using thicker double or even triple layer cardboard to add stiffness and I seem to like the results and consistency of that better than what I can get from using a CD. Hopefully I can soon come up with something a little more polished and finished looking than my current setup, although I'm pretty happy with the results I get from my setup right now I just want it to look a little better.
     
  3. ultrabike

    ultrabike Measurbator - Admin

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    Awesome!

    Very nice work Feilb!!!

    You could experiment and add a little absortion material around the tip of the mic. Not too much though. You still want to seal the cans against the flat surface of the cardboard. Mic should be flush to the absortion material, or in its absence, flush to the cardboard.
     
    Last edited: Dec 11, 2015
  4. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    I'm back with some question :

    Let's see some of CSD plots I got recently :

    Sennheiser HE-60 :

    waterfall_ full range.jpg


    HD800 :

    HD800_waterfall_20-20000.jpg

    Even in Bass area , ringings does not appear before - 40db . no ringings in the 200-500hz area right ?

    and compare the last one to Marv's :

    [​IMG]

    this one lets appear ringings around 500hz.


    As you can see. Marv's plots show more ringings than mine. Does anyone know why ?
     
  5. Thujone

    Thujone Friend

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    As I mentioned in the 400S thread, it would be greatly beneficial if you edited your waterfall parameters to be more meaningful. See my parameters on page 2 of this thread.
     
  6. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    Ah f**k. Thks !! I missed you gave the good settings in this post.

    I didn"t see where I was wrong. :bow:. I'm just Stupid :drunk:
     
  7. Thujone

    Thujone Friend

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    I had very similar CSD issues when I started making measurements. I couldn't figure out why everyone else's looked different and why their's all started at 200/500Hz. Turns out, once you make the time domain small enough, it just won't show you any data below 200Hz. Maybe it's because there is essentially a huge amount of slow decay as you go down in frequency and REW doesn't feel like computing it? Not sure.
     
  8. spoony

    spoony Spooky

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    Nice, now you will have to compensate for the solid plate gain. If the plate hole is hugging the mic in an airtight manner, there should be a rise in bass response from ~0dB at 1 KHz, up to ~5dB at 20 Hz.
    If you have a popular headphone, you can use results from a calibrated and standards-conforming rig to derive a compensation curve for yours (just the bass).
     
  9. logscool

    logscool Friend

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    It actually has to do with the fact that the wavelength of those frequencies is too long to be able to be captured in a very short domain FFT.
     
  10. spoony

    spoony Spooky

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    BTW: That's a tilde, not a minus sign...
     
  11. feilb

    feilb Coco the monkey - Friend

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    1. Your suggestion is that due to the cardboard, bass incorrectly represented? Just trying to understand your suggetion.

    2. Who should i be calibrating against? My low frequency measurements look nearly identical to @ultrabike.
     
  12. spoony

    spoony Spooky

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    Yes, due to the solid plate (regardless of material) and full seal there's some low frequency amplification. I calibrated my rig against an average of uncompensated measurements from the K7XX, PortaPro and other pairs which I found in many places including InnerFidelty, Golden Ears, Rin Choi's blog, and some other non spec-compliant measurements from Marv, Solderdude and others. Even when performing measurements with a compromised seal, there was some amplification happening when measuring the PortaPro.
    Of course there's no easy way (or possibility) to arrive to an all-encompassing representation of a headphone's FR using a makeshift rig, nonetheless, a +5 dB deviation in the bass is kind of a big deal and should be corrected (there's no way the HD600 or the PortaPro in my case have a -0 dB bass extension at 20Hz).
     
  13. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    After good settings thks to @Thujone :

    HD800L_waterfall_plot.jpg HE60_waterfall.jpg

    Looks better.
     
  14. ultrabike

    ultrabike Measurbator - Admin

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    I'm not sure bass should be compensated. I don't think Marv, Tyll, and Atkinson do that, other than perhaps hitting a target response. But that wouldn't be exactly compensation.

    One could add a little leakage through the pads to simulate hair though.
     
  15. The Alchemist

    The Alchemist MOT: Schiit - Here to help!

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    Is there a thread to just show pics of our setup and gear? Or is this the correct thread? I cannot do measurements as I do not have the equipment. If this is not the thread to post our gear and setup (without measurements - I can create one as I think it would be sweet to see pics of our member's gear and setups!
     
  16. spoony

    spoony Spooky

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    HATS measurements are not comparable to solid plate measurements even in the lower frequencies, at the very least there is a mismatch in trapped air volume and shape of the coupler. I think Hans' measurements should not be compensated in the bass, for contrast.

    Even with a leaky baffle, my measurements showed a sizeable boost in bass compared to what I was hearing. Solderdude later pointed out that plate-mounted mics should be compensated for bass gain so I did that taking offsets from measurements captured with spec-conforming rigs. I think my compensated graphs are more accurate to what I hear now. I plan on getting an in-ear rig soon to capture more data points for a given set.
     
  17. ultrabike

    ultrabike Measurbator - Admin

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    I'm not sure why that would be @spoony. I though bass boost was more a function of seal and acoustic impedance which shouldn't be too different from what HATS offers.

    I actually think Tyll's and Marv's measurements tend to show a little more bass than mine. I've been told so before me thinks. This could be dependent on headphone pressure against the measurement rig among other things.
     
  18. spoony

    spoony Spooky

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    I'm sorry that I'm not versed in acoustics as to give a justified argument. I may very well be wrong but the uncompensated graphs didn't jive with what I was hearing.
    Your open-cell-foam-coupled measurements showed less bass than what I think most people would hear, but the newer ones are very similar to my uncompensated graphs.

    Here's the Porta Pro (very light clamp) uncompensated:
    ppu.png
    Yeah, I don't hear the bass reaching down to 20Hz like that...

    Compensated:
    ppc.png
     
  19. Thujone

    Thujone Friend

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    FWIW

    My new solid coupler (CD) measuring setup on my HE-4 (see unfiltered graph):
    [​IMG]

    Old in-ear measurement setup of same headphone (see avg Velour):
    [​IMG]


    I would split the graphs up, but I'm too lazy. Either way, the affect of the ear drastically changes the upper mid and treble regions and slightly changes sub-bass. Mids seem about the same.
     
  20. ultrabike

    ultrabike Measurbator - Admin

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    @spoony, I think your Porta-Pro measurement might be a little shy in the treble. Also, your compensated plot still shows 20 Hz and it's down from your uncompensated by like 5 dB. That's not much. I mean it's a difference, but not mind-blowing.

    I actually agree more with your uncompensated plot BTW. But I would have to re-verify with my somewhat similarish KSC-75s.
     

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