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Discussion in 'Headphones (full-size)' started by nomax, Sep 8, 2016.
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  1. hrklg01 Contributor
    [ at 90dBSPL in average] amplitude & Distortion THD + K2+K3: Mysphere - typical ampitude and distortion 90 dBSPL.JPG

    [ at 90dBSPL in average] Distortion THD + K2 up to K6+:
    Mysphere - typical distortion 90 dBSPL.JPG
  2. Muinarc
    The THD rise in the lower frequencies looks a lot like the graphs I've seen for the AKG k812. Interesting stuff, thanks for sharing Heinz.
  3. JaZZ Contributor
    Thanks, Heinz, I really appreciate your effort!

    Since the percentages don't refer to the actual tone at the respective frequency (from what I get), but the average loudness level of the whole frequency response, the actual value for 35 Hz (e.g.) would be something like 27% total distortion, right? (Correct me if I'm wrong!) Or is it that the tone at 35 Hz is just ~87 dB instead of the average 90 dB?

    Now 90 or even 87 dB is already really loud, but from the further increase at 100 dB we could deduce how much equalizing below 50 Hz is possible or recommendable. (As for myself, I would do it anyway, but probably limited to 25 or 30 Hz.)
    Last edited: Nov 29, 2017
    Dobrescu George and dm24 like this.
  4. hrklg01 Contributor
    The 60mW max is a value delivering ~96dBSPL on the ear already.
    We want to secure customers only.
    There is no technical- but legal reason behind.
    BR heinz
    ruhenheiM and Dobrescu George like this.
  5. hrklg01 Contributor
    About additional equalizing:
    A dynamic system has the maximum membrane excursion at the fundamental resonance which is 50Hz for Mysphere 3.x
    Below the excursion is not less, but the SPL reduce because the air has to be accelerated at the same level if the same SPL is wanted.
    (This is true for totally open systems only!)
    This lead to the fact, that if additional EQ is used, the max. excursion will be exceeded once.
    So additional EQ-ing at very low frequencies is fine, but not when high SPL is wanted.
    BR heinz
    drwlf, ruhenheiM and Dobrescu George like this.
  6. JaZZ Contributor
    I seem to have confused a few things, and from your last post you seem to have misinterpreted my question. However, the most useful procedure in the context at hand would be if you could equalize the headphone yourself to flat down to 20 Hz and measure harmonic distortion in this configuration. (I know, that's quite a barefaced demand.)
  7. Dobrescu George
    I think the distortion figures look excellent!

    About Equalizing the Sub-Bass, I don think it would add any distortion, but since the distortion figures were at loud SPLs, I think that @hrklg01 was trying to say that adding more sub-bass at that high level, it could induce clipping, while at lower SPLs it shouldn't change the distortion figures. I might be wrong there.
  8. JaZZ Contributor
    Hi George

    Have a look at Inner Fidelity's graphs! All of them confirm that harmonic distortion increases with membrane excursion, particularly in the low bass – which is quite logical, since there comes the moment when with every further increase of excursion mechanical resistance will grow disproportionally.
    Dobrescu George likes this.
  9. Matrix Petka
    Sometimes it is good to sacrifice some quality in the sake of comfort. We are listening music for max pleasure :)
  10. Dobrescu George
    Oh, I see what you meant about the measurement there! :darthsmile:
  11. qazxsw80
    Heinz, is there a reason why you decided to make a metal case for the Mysphere (at least it seems that way in the picture)? What I mean, maybe I wrong, but It seems to me that most people strongly prefer carrying cases and metal ones are more suitable for storing, than carrying. For example, the Beyerdynamic T1 1st gen. had the metal case -
    And everyone I know didn't like it. They thought it was heavy, not really transportable and almost useless. And it seems to me that guys at Beyerdynamic realized it too and that's why they replaced it with the new one -
    And most people like it much more. So, maybe, It would be better to make something like the case from Ultrasone -
  12. hrklg01 Contributor
    About the slim transport case:
    Basically you are right - this case is very robust as well. We think that's even more important for a transport case as for the storage case.
    Only parts are our of metal and enforce mainly the edges of this packing.
    So I suggest to try and check it out when we are ready...
    Best regards,
    Matrix Petka likes this.
  13. greenmountain
    I quite understand but it would be good to have some guide lines to know how much eq is admissible especially below 50Hz. Of course there will be the problem of translating SPL to amp out put (the easiest would be to measure output voltage).
    The distortion figures look excellent especially considering that the human ear is most sensitive to distortion at lower sound level (max 60-80dB).
  14. hrklg01 Contributor
    Thank you for the idea!
    Ok, I'll give you a kind of table of maximum voltage to be applied for a series of frequencies...
    Please give me some time!
    Mille Grazie! :wink:
    drwlf and Dobrescu George like this.
  15. hrklg01 Contributor
    Here is a list about maximum voltage [RMS] usable for Mysphere 3.1
    For all the "EQ-gamers" :wink:
    Please understand that this list of voltage shows only the capability of Mysphere to be applicable to play in a technical safe mode for the product.
    This voltage does not mean to be applied for any long listening session because of potential hearing damage!
    The voltage are RMS = mid value ofa sine frequency. Impulses can be applied with higher voltage....
    KR heinz voltage possible for Mysphere 3.1.jpg
    ruhenheiM, james444, drwlf and 3 others like this.
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