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I've tried various search terms - nuthin' ? I'd like to see a plot of the impedance of a Beyerdynamic T-1 gen 2 phone. Or is this information so useless no one's bothered with it ( I DO have a talent for seeking answers to meaningless questions.)
I have another plot for you so you don't have to 'convert' impedance to actual change of FR.
Measured FR from 0.2 Ohm amplifier and from 120 Ohm out amplifier.
The change is about +0.5dB in the bass to lower mids area.
The 7kHz peak I measured is clearly a resonance which is shown in the impedance plot as well.
The 7kHz resonance is short lived and not affected by a higher output resistance.