Synergy4
Member
I have mains with only a 120VAC input, but when I sensed the signal using a small laminated core inter-stage XFMR and a scope, I noticed inpulses from the SMPS1200A700, so a added a thin Mu Metal shield to the Copper shield which snuffed the added SMPS noise near the Purifi amplifier module. Using shields, extra distance and keeping the electric fields at right angles helps with noise.
https://www.audiosciencereview.com/...-purifi-amp-builds.10478/page-125#post-983258
https://www.audiosciencereview.com/...-purifi-amp-builds.10478/page-125#post-983258