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D00M98 t1_je1qghq wrote

Color accuracy measurement is absolute, which is the delta between actual vs expected.

The issue with audio frequency response is the target. There is no standard on what is the correct or right target. And different folks can have varying preference on the target. Should it be Harman (and there are multiple Harman targets), IEF, Diffused Field, etc? So calculating the deviation from a moving goalpost is difficult.

If you like fancy 3 D plots, there are CSD (Cum Spectral Delay) measurements with frequency and impulse. Looks cool. Here is an example from HD600, on SBAF forum.

https://www.superbestaudiofriends.org/index.php?threads/sennheiser-hd600-measurements-2019.7499/#post-247043

However, my personal take is that measurements are not very useful, for both headphones and amps. At first level, frequency measurements can be used to filter out headphones (v-shaped, neutral, bass boost, hot treble). But I can get that info from reviews easily. And then on the headphone technical performance, measurements do not tell me about soundstage, imaging, separation, layering, and dynamics (maybe CSD).

As for amp, SNR (SINAD) and THD are also kind of useless. They measure minute differences, which human cannot hear or detect. On the other hand, tube amps measure like crap, but sometimes (or often) they provide more enjoyable listening experience than the best measuring solid state amps.

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