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IEM/Headphone - Dynamic Range - Can this be measured? Is Distortion one way to measure Dynamic Range?

OK1

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Most of the discussion on IEM's and headphones is fixated on Frequency Response and Distortion. I've been comparing my listening experience on the KZ XVX vs the ARTTI T10.

From a purely subjective view, the difference I hear goes beyond frequency response alone, to what I think is a difference in the dynamic range. The difference between quiet and loud segments of the audio, and sometimes its down to how volume changes on a single instrument in a phrase. With the T10, the difference between soft and loud is more visceral. Engaging.

In the traditional professional studio/live mixing world, I am familiar with the concept of using dynamic processors, such as compressors, limiters, and expanders, to reduce or increase the dynamic range. In instances where the dynamic range is reduced, it also comes with a dose of distortion, i.e a deviation from the original signal, showing up as extra overtones, 2nd order, 3rd order, etc, etc.

I am familiar with distortion measurements with speakers, and interpret this to imply that the speaker is "limiting" the expression of the sound, and therefore to an extend destroying it. And am familiar with the fact that this distortion varies with level., gets worse as loudness increases, so one can measure the distortion at different levels of loudness.

I may have already answered my own quest/question, but does this also apply to headphones and IEM's, i.e besides frequency response, the other important factor to consider when evaluating headphones, or IEM's would be to take a good look at their measured distortion.

If that be the case, the two budget IEM's measured recently by AmirM on ASR, should sound pretty good. Links below.



I have had an amazing experience with buying DAC's based purely on the measurements, which have correlated perfectly with my listening experience. The DAC's I own which measure better, sound better, no contest.

If this be the same with IEM's then the Moondrop Chu 2 and the 7Hz Zero 2, should be right there on top of the pile, going by measurements alone. Especially cos they both have exemplary performance in Distortion measurements, which I interpret as also having great Dynamic Range.

I am inclined to buy one of these, to test the hypothesis, do measurements of IEMs, correlate with the listening experience?
 
And this KZ IEM, with glowing review, in spite of one terrible glitch in its THD

 
I would say yes, with the massive caveat that every measurement of FR only holds if you can get as good a seal/ fit as the measurer did on the rig AND your HRTF is not massively different to the rig. But at least with IEM I would have thought if you can get the fit the same between 2 IEM, then at least you are on a level playing field regarding HRTF. @MayaTlab knows a fair bit about that.

Other caveat- measurements are a guide etc etc

Oh, and assuming both IEM are in phase too of course.
 
Another KZ IEM review, and there seems to be a common theme here, a distortion that is not present in the Moondrop Chu 2 and the Zero 2 ! So just going with the science, if this assumption is true, this should explain a difference in sonics, and a scientific reason to avoid the KZ's.

 
I would say yes, with the massive caveat that every measurement of FR only holds if you can get as good a seal/ fit as the measurer did on the rig AND your HRTF is not massively different to the rig. But at least with IEM I would have thought if you can get the fit the same between 2 IEM, then at least you are on a level playing field regarding HRTF. @MayaTlab knows a fair bit about that.

Other caveat- measurements are a guide etc etc

Oh, and assuming both IEM are in phase too of course.
Indeed - one assumes fit has been sorted.

And is made identical. In AmirM's review of the Castor, I have found the same issue with the KZ ZVX, the largest of the supplied tips did not provide a good enough seal, for my ears.

Please what would cause an IEM to be out of phase? Reversed pin connections by the end user (or during the packaging if cables are connected during packaging)? Or wrong wiring (e.g product design defect or manufacturing defect)
 
Please what would cause an IEM to be out of phase? Reversed pin connections by the end user (or during the packaging if cables are connected during packaging)? Or wrong wiring (e.g product design defect or manufacturing defect)
Yup. Some Moondrop products (as an example) are known to have been out of absolute phase due to design/ manufacture. How audible that is, different question.

And obviously having L/R out of phase due to incorrect pin connection is most definitely audible but assume you are on top of that.

PS- to misquote @Sean Olive in terms of importance: "frequency response, frequency response, frequency response"
 
Yup. Some Moondrop products (as an example) are known to have been out of absolute phase due to design/ manufacture. How audible that is, different question.

And obviously having L/R out of phase due to incorrect pin connection is most definitely audible but assume you are on top of that.

PS- to misquote @Sean Olive in terms of importance: "frequency response, frequency response, frequency response"
Can imagine this would be the advantage of connectors like MMCX, which make it almost impossible for the end user to connect wrongly, a cable to the ear piece.
 
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