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In Reply to: RE: Distortion and frequency response are good starting points posted by PaulF70 on June 1, 2025 at 08:38:25:
Non-linearities create distortion such that the harmonics change differently in level compared to changes in the fundamental. Second harmonic level changes, if the fundamental level is proportional to x the second harmonic level changes as x^2, the third as x^3 etc. I've wondered if natural sounds do the same, so do the relative levels of the harmonics of instruments change in the same way? I don't know if that is the case but if it is true I wonder if the best thing for an amplifier to do is to mimic that behavior. Some power amps measured by Stereophile show a straight line of THD vs power (on a log-log scale) with a slope that shows which harmonic is dominant, and sometimes the slope changes as power increases. However, most don't do that. Maybe that would be a good indicator of 'natural sound' to have the harmonics decrease in a non-linear fashion as the signal falls to zero.
(Note, this is the concept of distortion intercept points, a metric that is used in the RF world to predict distortion based on one measurement taken at a low level knowing it will follow a predictable slop with input power)
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Follow Ups
- Distortion vs power - 13th Duke of Wymbourne 06/1/2511:54:51 06/1/25 (1)
- RE: Distortion vs power - morricab 08:49:28 06/17/25 (0)
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