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Re: You can’t compare the end result.

Please, Soundmind, leave it to the experts! IF higher order distortion did NOT matter much, virtually all amps would be OK. This just is not the case.
Rolf, you are on the right track. For decades there have been weighting factors for higher order harmonic distortion. The most extreme that I have seen is: Multiplier = (n-1)! / 2
The one that I think is closer is: Multiplier = n (squared)/4
Either way, higher order distortion, even in small amounts is very important.
Also you should look into 'triple beat distortion' for max distortion values.
Finally, 2'nd and 3'rd IM is actually related to the music itself. With higher orders, it deviates greatly from falling on a note that is in tune with what is being played. That Is why it is sometimes referred as 'metallic' sounding.

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