DonH56

A decent transformer or Hum-X plug for isolation should work if it's not a bad RCA cable (as seems likely based on info to date), but...

Sounds like a bad rca cable. Swap out the cables and see if it improves. No, you don't need fancy expensive cables, just one that is...

Just got my Buckeye NCx500 3 channel in yesterday. Took the cover off to have a look, took pix. It's solid. Took 5 weeks for delivery...

This concept isn't new—take tourmalines, for instance, which are used to fill cables, absorbers, racks, filters, filter housings, and so...

Had to look up "frippery". :) Or decoupling to an inappropriate place, like a filter (RFI suppression) capacitor connected from the...

It would be hard for the power cord to cause problems, other than the shared ground wire. And that's not a problem in the power supply...

Indeed. The physical and the data layer are completely separate. Basically, Ethernet ALWAYS makes sure the zeros and ones in the packet...

That figure of 80% (or even over 90%) aligns very closely with my own real-world experiences. Throughout the 90s and into the early...

I liked your answer. I think it's a plus that different people explain things. Someone reading this is more likely to understand with...

Jim Brown retired Audio Engineering Society, Noise & Interference commentate co-chair has a paper on long audio lines. Transmission...

Yah, sorry, I tend to get wordy. Simpler is usually better, but sometimes incomplete, and then I spend more time expanding my answer. Or...

You must have been typing at the same time as me! I like your more details answer, I was trying to keep it simple

There are 2 ways in which a power supply can be 'quiet'. The usual spec is differential and is about the noise/ripple voltage of the...

What everybody else already said. Ethernet is galvanically(*) isolated per spec, virtually all high-speed data signals are differential...

There's a lot of digital processing on data from a network that tends to either correct errors or lose lock completely, if the noise is...