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Individual variation in headphone models, calibration, and the circle of confusion

Joined
Oct 6, 2019
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#1
I've read some interesting things regarding variation in individual headphones of the same model this weekend and wanted to hear some takes on this from here.

The first was this article:
https://www.innerfidelity.com/conte...ame-adjustments-focal-utopia-and-audeze-lcd-4
TL;DR is that Tyll and Bob Katz had different takes on two pairs of headphones and it turns out that both pairs of headphones they were comparing measured differently.

Then, was reading a bit about Sonarworks individual headphone calibration service, and found some people sharing their results at the end of this thread:
https://mixmasterforum.com/t/using-...-output-of-mac-for-headphone-correction/79/37

For example, here is their average measurements of the hd650 (they use a harman-ish compensation curve):
Screen Shot 2019-10-28 at 10.31.11 AM.png


And here are the measurements of a couple people's individual pairs of HD650 after they sent them to sonarworks:
55f91c5b933d00c02f84a00cd40adbf9a6949652_2_1380x636.jpg

589f4083940d835883d994e1115c154926bf0fe9.png


The differences seem to be within +/- 3db and some of these definitely seem like they would be audible. I bring up the circle of confusion in the title of this post because I wonder if some of the subjective differences in headphone evaluation could be attributed to variation in samples of the a model.

Anyone have access to empirical data of different headphone variance within a model? Anyone tried to get their headphones individually calibrated?
 

flipflop

Addicted to Fun and Learning
Joined
Feb 22, 2018
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#2
Anyone have access to empirical data of different headphone variance within a model?
PM-3:
https://www.innerfidelity.com/images/OppoPM3.pdf
https://www.innerfidelity.com/images/OppoPM3SampleB.pdf
https://www.innerfidelity.com/images/OppoPM3SampleC.pdf

LCD-X:
https://www.innerfidelity.com/images/AudezeLCDXSN7454971.pdf
https://www.innerfidelity.com/images/AudezeLCDXsn7456406.pdf
https://www.innerfidelity.com/images/AudezeLCDXSample3.pdf

LCD-XC:
https://www.innerfidelity.com/images/AudezeLCDXC.pdf
https://www.innerfidelity.com/images/AudezeLCDXCSample2.pdf

LCD-3:
https://www.innerfidelity.com/images/AudezeLCD3sn2312488.pdf
https://www.innerfidelity.com/images/AudezeLCD3sn2312341.pdf
https://www.innerfidelity.com/images/AudezeLCD3sn2312454.pdf
https://www.innerfidelity.com/images/AudezeLCD3sn2312260.pdf

LCD-2:
https://www.innerfidelity.com/images/AudezeLCD2SN5312123.pdf
https://www.innerfidelity.com/images/AudezeLCD2.pdf
https://www.innerfidelity.com/images/AudezeLCD2SN5325928.pdf
https://www.innerfidelity.com/images/AudezeLCD2sn53211704circa2012.pdf

T1:
https://www.innerfidelity.com/images/BeyerdynamicT1.pdf
https://www.innerfidelity.com/images/BeyerdynamicT1SN3964.pdf

HD 800:
https://www.innerfidelity.com/images/SennheiserHD800.pdf
https://www.innerfidelity.com/images/SennheiserHD800B.pdf

HD 800S:
https://www.innerfidelity.com/images/SennheiserHD800S.pdf
https://www.innerfidelity.com/images/SennheiserHD800Ssn01067.pdf
https://www.innerfidelity.com/images/SennheiserHD800Ssn01070.pdf

Aeon:
https://www.innerfidelity.com/images/MrSpeakersAeonBook.pdf

ER4S:
https://clarityfidelity.blogspot.com/2015/11/four-pairs-of-etymotic-research-er-4ss.html
 
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