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Re: Shedding some more light...


GE in this case is indeed General Electric. What they found was that people will tolerate up to nearly 40% of even ordered harmonic distortion, but odd-ordered, and particularly the harmonics past the 7th or 9th, are not tolerated even in 'insignificant' quantities.

Ok. So you can't give me anything more specific about its publication so I can try and locate a copy?


With respect to the little test: The meter would be a VU meter, displaying the signal driving an 8 ohm speaker. In this case, a distorted waveform at -20db (considerably less energy (!) then the undistorted waveform), can easily sound louder. although it clearly is not as far as the instruments are concerned.

Um, a VU meter? I thought you might have been referring to some real test and measurement gear. Not something as crude as a VU meter.

What's your point?


Hafler's test is a good step in the right direction, but suffers the same problem that a lot of physics tests do- that the results change depending on the observer, in this case the null circuit has problems of its own!

I really hope you're not alluding to the Heisenberg Uncertainty Principle here.


As far as industry- I've been touting this stuff for years, not that too many have listened.

Then stop touting and start doing. Why do you expect someone else to do it for you?


At any rate I have designed our gear to generate as few odd ordered harmonics as possible. It is actually possible to identify things in a circuit that do that.... so, as 'industry', that's been what I have tried to contribute, FWIW.

That's cool.

se





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