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RE: You are correct Rich.....

Posted by Peter Olofsson (A) on August 26, 2007 at 12:48:14

In Reply to: You are correct Rich..... posted by tubesforever on August 26, 2007 at 11:47:46:

It's indeed a fascinating subject :-)

My brother has a microphone preamplifier with selectable amounts of negative feedback. He says that the more feedback, the more "dirty" it sounds. From my electronics studies, I learned that negative feedback cancels all 2nd harmonic distorsion, but leaves the other harmonics in the signal.

Anyway, from Mark's response, the main harmonics on a record are the 3rd, 5th and 7th harmonics. Odd-order, in other words. So I guess that answers my question.

I posted some thoughts about harmonic distorsion and how it relates to music. Even if we are dealing with almost pure sine waves, the 5th harmonic (an octave and a fifth) would cause dissonance. In the Hammond organ (which is close to pure sine-waves) the 5th harmonic is often avoided by organists because it has a very "mean" quality to it, which is sometimes inappropriate for the music.

My point is, there are different "levels" of dissonance, within the harmonic series. Amplifier designers should probably not worry much about the 2nd and 4th harmonics. I believe that in order to minimize the Total Harmonic Distorsion, designers often neglected the musical perspective of it all, at least back in the 70's.

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