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RE: Is there any real benifit sonically between class A, AB etc...

I wouldn't be surprised if these theories of harmonic distribution have validity. But I believe that dynamic linearity, accurate changes in level from micro to macro may be the most significant factor in sounding 'real' and an amplifier that must compress the negative half of a waveform can hardly be called linear. Add that SET amps are very low power and peaks in the great classical music can easily top 30 dB and that adds more compression.

In deed the Berning BA150(really about 225 watts by the way) sounds best in its highest distortion(no feedback) format because in spit of added distortion that's where it's most linear.

We could go on and on. Obviously all distortion is bad. And with all the variants of amps there are various distortion combinations and to a certain degree we are now in a subjective region to a certain extent. I suspect that we differ in what we concentrate on when listening and the factors that most offend us are the ones we can't ignore and determine the amps(and other gear) we like the least. And that may be what makes this hobby fun, differences of opinion and that all gear is flawed in some way so we never reach audio nirvana which would be the end of our hobby.

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  Kimber Kable  

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