SoundOnSound have a good article covering why this doesn't happen. In short, there's no standardized methodology (i.e. standard dummy head) for measuring it, an

SoundOnSound have a good article covering why this doesn't happen. In short, there's no standardized methodology (i.e. standard dummy head) for measuring it, and the interactions between the headphones and the listener's head vary significantly. You could (relatively) easily measure the free-field response of the headphones, but I suspect that would tell you very little about how they will sound when you're actually wearing them. For example it would likely underrepresent the difference between closed-back and open-back designs. https://www.soundonsound.com/techniques/designing-measuring-reference-headphones https://www.soundonsound.com/techniques/designing-measuring-...