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  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...
  16. JMS

    AES2013: Listener Preferences for Different Headphone Target Response Curves

    Sean Olive, Todd Welti, and Elisabeth McMullin of Harman have recently published another intriguing paper in subjective headphone sound quality. Following their previous paper "Relationship between Perception and Measurement of Headphone Sound Quality" discussed in this thread, they have...
  17. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    Quote:   I've only just started to play with equalization, so I started addressing the bigger issues first, which to me was the broad lower midrange bump. I haven't played with the 6k peak yet, but because it's high-Q (looks like 1/6 octave), it might be relatively benign. I've seen some...
  18. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    Quote:   Only with (b) is the mic mounted in one ear. With (a) it's mounted on a tripod stand. In both cases a stereo sine sweep is played, so sounds from both loudspeakers are picked up by the mic. The difference between (a) and (b) is explained by what the head and torso do to the...
  19. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    Let me add some more explanation as to what I'm trying to accomplish, which I really should have done in the initial post.   The motivation is to establish an ideal frequency response for headphones, in terms of subjective preference. For loudspeakers, we already have good research on what...
  20. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    Measurements of Sennheiser HD700 (yellow), HD650 (purple), and AKG K550 (green). The HD650 differs slightly from before because I remeasured to get a more consistent result.       These relative measurements are consistent with the general tonality that I hear from them. The HD700...
  21. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    Thanks for posting these comparison graphs, ultrabike. Do you have links to the original descriptions? I'd like to know whether smoothing was applied to them. My headphone graphs are unsmoothed, and look more like the ones you posted after 1/6 or 1/3 octave smoothing.
  22. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    Ah, it's apparent that I need more clarification. The loudspeakers are set up in my living room for normal listening, forming an equilateral triangle with the listening seat about 7 feet on each side. The measurements from the "center" position are taken from the position of my listening seat...
  23. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    Quote:   It is to minimize the effects of comb filtering from reflections, diffraction, or other artifacts from the loudspeakers or the room. It is a standard technique used when measuring loudspeakers, such as in Stereophile's measurements.
  24. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    My personal in-room HRTF frequency response is implied by the difference between the red curve (free standing) and green curve (in ear). Given that these two aren't spatially averaged curves, I wouldn't look too closely at small peaks and dips of low bandwidth. Looking at wholesale differences...
  25. JMS

    HRTF and binaural measurements of Sennheiser HD650, HD700, AKG K550

    In the thread in this forum on the AES2012 paper about perception and measurement of headphone sound quality, I asked the Harman research team whether they have considered measuring desired headphone frequency response using loudspeaker playback on a dummy head as reference, similar to what is...
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