Recent content by JMS
  1. JMS

    Why aren't all headphones equalized to be flat and thus sonically perfect?

    Great examples of attempts in this direction so far in this thread. Another example is the AKG N90Q, which tries to do this in an all-in-one package, with the measurement system built right into the headphone.
  2. JMS

    AKG N90Q paper - Characterizing the Frequency Response of Headphones - A New Paradigm

      Ah yes, I should have said that the issue is not the use of an artificial head, which we do want a general mesurement to use. It's measuring between headphone and ear versus at the eardrum. If published frequency responses were measured outside the pinna, as in this paper, but using an...
  3. JMS

    AKG N90Q paper - Characterizing the Frequency Response of Headphones - A New Paradigm

      3) Not that I know, but I note that much of the recent published work (e.g. from Inner Fidelity and Harman) use simulated ear measurements. I wish there was more work being done in binaural mic measurements, which would facilitate users like us doing our own personalized correction curves.  ...
  4. JMS

    AKG N90Q paper - Characterizing the Frequency Response of Headphones - A New Paradigm

    An intruiguing paper was published in May 2015 that apparently discusses the science behind AKG's latest $1500 flagship and possibly the latest JBL Everest headphones. I'm surprised that there's been absolutely no press for the paper and not much more for the headphone (get on this Tyll!).  ...
  5. JMS

    AKG new N90Q

    Which of Core Tech's tech will AKG be using? If it's the analyzers, does that mean it will interface with Windows?
  6. JMS

    An Interview with Paul Barton of PSB and NAD - Head-Fi TV

    It's good that PSB designs their products using scientific principles. I have heard many of PSB's headphones and speakers and their great neutral sound reflects that.   However, I must call out the fact that, in yet another interview, Mr. Barton speaks at length about all the published...
  7. JMS

    Harman headphone research incarnated as AKG N90Q?

    They did mention the "TruNote" technology will appear in other headphones to come later this year.   I would guess the microphones can measure the person's specific ear canal resonance to compensate at high frequencies, and size and leakage of the enclosure formed between headphones and face...
  8. JMS

    Harman headphone research incarnated as AKG N90Q?

    At CES 2015 Harman announced their new AKG90Q, with an intriguing, perhaps revolutionary, feature:     Given the recent research Harman has been doing in headphone target frequency response curves, my guess is that the system will actively apply DSP to equalize the target response (to one...
  9. JMS

    JBL LSR305 vs m-audio Av-40

    As an owner of the AV40's, I have to say: Get the JBL's, no matter if the AV40's were 80% off and you've already stolen your grandma's money. The Amazon page for the JBL's shows an excellent set of measurements. The AV40's don't sound as good as that.
  10. JMS

    Measurement based equalization of HD650, HD700

    What I learned from this experience is that both measurements and listening are required for a proper equalization. The measurements were telling me where the issues are and what to try to correct, but the listening told me how much correction to apply. I wouldn't have arrived at the same...
  11. JMS

    Measurement based equalization of HD650, HD700

    There's been some recent discussion over in the Sound Science forum about new research on the measured and subjective response of headphones, including a revelatory paper (summarized here) on the subjective impressions of equalized frequency responses.   I've been doing a bit of measurements...
  12. JMS

    Successful ABX testing to hear the difference between Redbook Audio vs upsampled to 192/24

    This is not too surprising. An audible difference could be caused by imperfections in the upsampling program, the computer's audio pipeline (which may process different bitrates differently), the DAC (ditto), or quantization errors with resampling (unlikely at 24-bit).   Given that...
  13. JMS

    AES2013: Listener Preferences for Different Headphone Target Response Curves

    Couple more questions for Tonmeister:   You mentioned that channels were measured independently for the paper because comb filtering in the upper frequencies are ignored by our ears. However, that wouldn't apply to the 1-2khz stereo crosstalk dip, which accounts for an audible difference...
  14. JMS

    AES2013: Listener Preferences for Different Headphone Target Response Curves

    Thanks for the helpful response. This answers my questions. Looking forward to the PPT. With regards to (2), I agree that without anchors and identical conditions the scores aren't directly comparable. Still, in your loudspeaker paper "Regression Model for Predicting Loudspeaker Preference"...
  15. JMS

    AES2013: Listener Preferences for Different Headphone Target Response Curves

    My own questions are: No details were given on how the RR1_G curve was derived from the normal in-room response: Was it a steady-state measurement using GRAS 43AG? Did the Audeze's equalized response match it exactly? Why average 7 channels individually, versus playing them...
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