When an audio engineer first hears a faint hiss at 50 Hz or 60 Hz that seems tied to the building’s mains rather than any musician’s voice, the culprit is almost always a ground loop. In plain terms, ...

I can't seem to get my CATV feed grounded well enough to prevent ground loop noise on the audio and video from my PC (which is in another room). I grabbed the el-cheapo Radio Shack audio ground loop ...