The most common comment that I read about asymmetrical clipping vs. symmetrical is that the former introduces more even-order harmonics, resulting in a smoother and more natural sound, often described as "more tube-like." But the difference is still fairly subtle in most cases.
jimilee wrote:
More compression.
While this is possible depending upon the choice of diodes used, it is much more common that asymmetric clipping will actually
reduce compression. This happens because adding diodes to one side of the clipping diode array to make it asymmetrical will raise the total forward voltage threshold on that side, resulting in less signal being clipped and giving a more open sound and greater output volume.
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