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Technical and scientific discussion of amps, cables and other topics.

Any amps with tubes will have more distortion and will distort the frequency response

High output impedance amps will react with speaker impedance to change the frequency response in a way that could be audible.

Whether it is audible or not requires careful level matching at 1000Hz. and hiding the DUTs -- otherwise a listener would be comparing amps playing at different volumes which is not a meaningful difference.

Most people shopping for an amp would be comparing similar current designs where differences are less likely to be audible than the amps you listed.

Sorry if this insults you but hundreds of audiophiles have experimented and found "I know what I hear" was a gross exaggeration for them.

It could be for you too.

That's what objective tests help us find out.

Richard BassNut Greene
My Stereo is MUCH BETTER than Your Stereo


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