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JB, Thanks for the tip on scrolling down your first link$^&*. The way it opened on my monitor, I couldn't see that it went on beyond the links. Interesting article.
Though it was a little disconcerting, not finding much info on it in my searches, I have done a little AC cap filtering to good effect inside my Torii and CSP3 IECs. For hot to neutral connections, I couldn't find instructional information for audio, but saw that some folks were doing AC filter caps. So I read up on the method for appliance filters where they use special caps that are non-polar, difficult to burn up, and accepting of high surge voltage. Based on this, and wanting to try good audio grade caps I had around, I chose a few caps that were high voltage (1000-1200 VDC/600 ACV) and non-directional, to try from hot to neutral on the IEC interiors. I reasoned that the likelihood of a strong, sustained surge with my power unit surge protection in place, and the IEC fuse, was low, so went on with caution. The caps I had that fit this criteria, and would fit that position in the amps, were a 0.33 Mundorf Silver Oil, Jantzen Z-cap Superior 0.33, and a Jantzen Z-cap Silver 0.1. The little Silver Z-cap was my favorite. Not sure how much of that was the smaller value, but considering value has mattered in all the experiments I have done, suspect it was a factor. Whatever, the Silver Z-cap sounded most clarifying, and giving the best spectral balance....it was most transparent to me.
Over several years of progressive Torii and CSP3 experiments, it still amazes me how much all caps, resistors, and wires, whether for power, or going to ground, reflect their sound pretty much as if they were part of the signal path. From this experience, I agree with the article, a filter sound can be seriously effected by the cap used.
Same from putting a cap between the IEC ground and the Torii ground buss, every cap I tried there created a different sound. Again, these were all small values, from 0.022 to 0.33. I ended up with a .022 Miflex Aluminum oil, doing some pretty nice filtering without notably coloring the sound as I recall.
I have not tried Neutral to Ground.
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