Based mostly on discussion in this thread
https://www.audiosciencereview.com/...be-amplifier-distortion-vs-solid-state.18832/
I thought about alternative methods to measure headphone linearity. I tried the X-Y plot where on X-axis there is a driving voltage and on Y-axis there is a transfer ratio in dBV/V of acoustical output/drive voltage. I tried my Sennheiser HD598 at several frequencies from 100Hz to 10kHz and voltage range from -80dBV to +6.85dBV. HD598 have sensibilty of 112dB/1V/1kHz. The measurement was calibrated at 1kHz to give 0dBV/V approx. The area between -80dBV and -60dBV is affected by microphone noise at 100Hz and 200Hz plots. It seems that at 100Hz and 200Hz the output SPL is stressed above 0.1V driving voltage. On the other hand, higher harmonics make the 1kHz and 2kHz plot to rise above 1V driving voltage. I would especially appreciate if @solderdude could put a comment.
https://www.audiosciencereview.com/...be-amplifier-distortion-vs-solid-state.18832/
I thought about alternative methods to measure headphone linearity. I tried the X-Y plot where on X-axis there is a driving voltage and on Y-axis there is a transfer ratio in dBV/V of acoustical output/drive voltage. I tried my Sennheiser HD598 at several frequencies from 100Hz to 10kHz and voltage range from -80dBV to +6.85dBV. HD598 have sensibilty of 112dB/1V/1kHz. The measurement was calibrated at 1kHz to give 0dBV/V approx. The area between -80dBV and -60dBV is affected by microphone noise at 100Hz and 200Hz plots. It seems that at 100Hz and 200Hz the output SPL is stressed above 0.1V driving voltage. On the other hand, higher harmonics make the 1kHz and 2kHz plot to rise above 1V driving voltage. I would especially appreciate if @solderdude could put a comment.