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RE: Phase Shift

Phase shift was my initial thought. I still don't see it as a very plausible cause. The cutoff frequency's -3db point is at 0.34 Hz with the 1 Meg and 0.47 uF components. The -1db point is at 3.4 Hz and the FR is essentially flat by 34 Hz. With the 0.22 uF cap in place the -3db point is at 0.72 Hz

I could be wrong though and the few degrees of phase rotation at 20 Hz could have a larger effect than I'm allowing for, hence the qualifier about this being a theory.

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