@jeffseight , I am based in western Canada. Never heard of the device you are referring to but I’ll look into it - thanks for the suggestion.
I’ve not been able to measure the quality of my power as I don’t have a meter that reads THD. I mentioned above that I had measured my internet service quality using Fusion network tests (a website you go to and click to start the test). Measures jitter, latency, download and upload speed. And as I mentioned, when the sound is bad, jitter and latency go from their normal 3ms and 12ms to spikes of 40ms or so and 70ms, respectively. I’m simply guessing that AC quality is also poorer during those times.