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Who said measurements don't matter?

Have you been paying any attention at all?

The measured level of low ordered harmonic distortion, unless very very high, doesn't matter much at all but even just a tiny bit of measured upper ordered distortion matters a lot.

So, of course measurements matter.

It's THD that doesn't really matter. THD, by itself, is not enough information to have any real meaning.

To place things in proper perspective, in terms of audibility, the measured distortion needs to be multiplied by the square of the order.

1% of 2nd would be 4%

.5% of 5th would be 12.5%

.05% of 21st would be 22.05%

.05% of 31st would be 48.05%

.005% of 81st would be 32.805%

Unless the amplifying devices themselves are perfectly linear (and none are) a conventional push pull amplifier that uses GNF produces harmonic distortion all the way out to the 81st order.

My 300b SET amplifier, at the power levels that I use it, produces harmonic distortion out to the 3rd order.


Tre'
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"Still Working the Problem"

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