I would think a Zobel would imply some type of impedance correction and I can't see how that could be universally applied. Walker's site mentions "very high frequency electronic noises" and RFI. I'm still guessing that it is a low pass filter up around the neighborhood of 20kHz.
Well, I was way off. I don't really know how close Alan's recipe is to the Wlaker's. Anyway, with the cap values in Alan's circuit the filtering is way up in the RF range.
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