I recently simulated the circuitry for a new spin on our amp technology....
With very realistic component values and some clever tweaks, I was able to get THD at rated lower down to 0.00002%. Yes, that’s FOUR zeros.
Interestingly, the original purpose of the changes was to increase damping factor at high frequencies, which these new circuits also do quite well. The simulations take a long time, some more than an hour for a very particular scenario, so I run them in the background when there’s time.
What amount of THD (or lower) do you believe is “essentially distortion free”?