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Isobaric requires half the air volume. Lowers second harmonic distortion. Extends low frequencies a bit. It also lowers overall group delay in the lowest frequencies. It appears that many people do not like cleaner bass, with lower distortion and extended deeper low frequency response.. They...

The Fletcher Munson curves are a set of experimentally determined graphs that show how loud—in dB SPL—a sound at one frequency must be in order to be perceived as equally loud as a sound at another frequency. It is HUMAN sensitivity to different frequency bins. It is not an EQ curve that you...

One possible explanation is natural hearing loss. As the class two group (28%) were a different demographic and wanted less bass and more treble. This is typical with people who have hearing loss.

IEM's will have a different target function than circumaural type cans.The application is different. One fires through your pinna at 90 degrees inducing your pinna's acoustic filter at a 90 degree azimuth and the other bypasses that filter altogether. You cannot ignore these filtering effects...

An HRTF would not be described as having boosted lower treble response. That's because it is a transfer function of the acoustic filter of the pinna. Hence it is natural for humans to hear this function when they listen. The bass and treble are most likely not emphasized at all in the Harman...

The part of the data I would like to see, is the correlation between listeners (or lack thereof) . If they are very similar, then we can make this usable in correcting headphones, if they are all different, then it only tells us information about individual HRTF's but not about what headphones...

I am not so sure about the hearing loss part in individuals . He asked his subjects to match the loudness of each third octave band perceptually. This would not change anything as far as hearing response functions individually. As what they heard from the loudspeaker would include any hearing...

He is attempting to explore one area of why headphones sound so different from listening to a loudspeaker in a room. So the experiment only covers part of what is happening. Timbre is a big part why something sounds the way it does. So he is isolating that aspect by attempting to mimic the...

The real question since those variances above 2K are different for everyone should they be changed at all. As they would hear the same differences in their personal response when listening to loudspeakers as well.

Because it is based on localization . The loudspeaker is not placed in the sameplace as it would be in stereo

OK, OK, I am going to suspend my defense for now. But I am going to explore David Griesinger recent work on proximity and equal loudness simulations in order to emulate timbre balance in headphones and attempt to look at measuring the acoustic impedance of headphones and what impact they have on...

What would be the reasoning behind why you think these two are so different? You are simply taking an impulse response or noise and using an FFT analyzing the acoustic signal and then comparing it to a reference. My proof is that no one seems to be able to look at a headphone metric and then say...

Except that current methods are not repeatable and/or reliable. I propose that measuring through a pinna and ear canal simulator is an error in the protocol. It will always be difficult to define target function while overlaying some averaged pinna and ear canal filters over the top of the...

The confusion is because we are listening to the sound power of loudspeakers in a room. So the reference changes from what a loudspeaker is doing(Frequency Response). But we currently measure these so differently that they have little to do with one another. Having said that the timbre or...

You don't compensate for HRTF's. There is no need. The target function for a headphone is different than a free field response target for a loudspeaker. That is due to, proximity of the source, angle of source to the ear, room gain(Schroeder Frequency) , the current metric is not free field (for...

Again, the reference does not change for anyone. Miles Davis in a concert hall will play the same and have the same acoustic output for you and for me as long as we are both in the relatively same location. The speaker is not re-tuned for each listener. Although your pinna and my pinna are...

That's ridiculous! Everyone knows there is no such thing as Brent Spinner

I am not certain about what the is the very best way to analyze headphones acoustically. I only understand (after using many of the current HATS systems) that the results we obtain currently are unreliable and not very repeatable (hence why so many rigs tell you to run an average which in turn...

It's not wrong per se. But it does not represent what is heard by the listener in the low frequencies. The acoustic loading on the driver is incorrect as compared to when the headphone is on your head, even with an open back design.

All current HATS or just head and pinna systems are not consistent with one another(they arrive at slightly different results) ie; there is no real standard. Just deviations on a theme. Isn't that the goal of audiophiles, audio engineers, and designers in general? In some sense anyway? I agree...