I am so sick of people telling me it is just dirty power or a cheap XLR cable because I have spent the last three semesters dealing with signal processing and I know what a 60Hz hum sounds like versus high frequency polling noise. The exact day the power company swapped out the old analog spinning disk for their new Itron mesh unit, my studio monitors started picking up this periodic digital chittering artifact every 45 seconds on the dot. It completely bypasses my power conditioner and bleeds directly into the USB ground bus on my DAC, regardless of whether I use ferrite chokes or isolated circuits. It is clearly radiating into the panel's neutral line every time the meter beacons out its telemetry packets to the neighborhood collector node down the street. If another uninformed boomer in the local forums tells me to buy an expensive power strip to fix an issue that is clearly caused by the utility company injecting wideband RF noise straight through my service mast, I am going to lose my mind.