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In Reply to: "cap distortion" in spice. posted by dave slagle on December 4, 2014 at 07:38:25:
Um.
Unless I misunderstand what you are concerned about, that just looks like the capacitor is behaving as a high-pass filter against the varying load resistor. The filter corner frequency (and associated phase shifts) depend on the product of R*C. It's not a nonlinear distortion, it's the characteristic of music being played through a filter of different characteristic. That's pretty much the reason for capacitors to exist, it's what they do for a living.
Subtracting one signal from another is an EXTREMELY sensitive test, anything different, particularly including linear filtering responses, will show dramatically.
Unless I'm missing something.
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