Manual Equalization

[jaakkopasanen]

Headphone compensation does not take into account the fact that even around ear open back headphones alter ear canal resonances by dampening some frequencies and shifting peaks and notches. In addition headphone compensation is not possible at all with in-ear monitors.

Implement manual equalization where user creates equal loudness contour by comparing 1/3 octave band noises against each other or single anchor band (such as ~630 Hz) and adjusting gain for each band. This is to be done once with speakers that are used for measurement and once with headphones and speaker virtualization without any modifications to the impulse responses. These two curves can then be used to calculate equalization curve which counters the headphone's effect on ear canal resonance. After the calibration virtualized speaker (without any modifications to impulse response) should sound exactly like the real speaker.

It's important to do the equal loudness contour with virtualized speaker where there have not been any modification to the impulse responses. Cropping out tail, using tracking filter and other things will affect the overall frequency response of the system after which the real speakers and virtualized speakers are not comparable anymore. Once the calibration has been done any modifications to impulse responses for room correction etc can be done.

[jaakkopasanen]

David Griesinger's Youtube video about his software doing the same: https://www.youtube.com/watch?v=1VaKZr208Dc

[rpx91]

In playing around with trying to get Transform working with my Air Pods Pro I've come to realise that the issue is the measurements of IEM's. On a few the frequency response consistency is well controlled, these transform well. On others, it's a crap shoot.

Equal loudness contour would help with IEM's also.

[pillepalle1234]

Hello,
any news on this? I think this is a high impact issue, the frequency repsonse at the eardrum might deviate by 10db or more from the measurement with in ear microphones.

Or is there a way to do it, like using Griesingers Tool or the PEACE GUI For EQApo which implemented such a test aswell.
https://www.audiosciencereview.com/forum/index.php?threads/calibration-tool-for-headphone-hearing-capability.17279/