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This Post Has Been Edited by the Author
In Reply to: RE: What an astonishingly insightful (and iconoclastic) assessment of some formerly revered designs.... posted by Tre' on March 22, 2017 at 08:03:43
There's nothing wrong per se-- with any of the explanations
I've read here. In fact, I think this is an excellent discussion,
but there is more!
Common-Mode distortion finds its way into EVERY part and EVERY wire, and EVERY application in audio that is operating near any source of
alternating current. That energy is in everything that runs on, or is near to A.C.
Differential circuitry and balanced connections reduce Common-Mode, as you well know.
I do not disagree with the THEORY or APPLICATION of differential
circuits or balanced connections. Fine-- we agree here.
What you're not addressing is the fact that splitting a signal into two halves and then re-assembling it throws off its own distortions that are
MIXED IN with the differential output-- as Common-Mode noise.
Differential operation REDUCES the Common-Mode, it isn't 100%
because of wiring, devices not being totally equal, and etc.
In a differential system output, there is also Common-Mode mixed with it.
The sum of the two halves DOES equal a Single-Ended signal mathematically,
but it DOES NOT consist ONLY of a true differential output. It is mixed with what Common-Mode is left after the Common-Mode attenuation of the differential circuit..
Engineers measure some of these things as various distortions-- aberrations from the desired "perfect" output, which would be devoid
of all Common-Mode. That never occurs in real world equipment.
Single-Ended operation is all Common-Mode. You can filter it, but
you can't process-out the Common-Mode because that is your signal!
The advantage of S.E. operation thus becomes obvious: there is no
Common-Mode processing/reduction of the signal's Common-Mode content.
What could be simpler? The S.E. signal is not differentially processed.
-Dennis-
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