I have a freestanding CD burner hooked up to my stereo, which I use to burn vinyl onto CD via analog RCA inputs.
In another room, I have a DVD player, with analog RCA audio outputs that hook up to my TV.
I was attempting, for the first time, to burn audio from a DVD onto a CD. I lugged my CD burner out to where the DVD player was, used the same RCA cables that went into the TV, and plugged them into the analog inputs on the CD burner. When I previewed the sound in record mode, there was a substantial buzz that was nearly as loud as the audio signal on the DVD. I was using the very same cord I’d used to plug into the TV, so I doubt a faulty cord was the issue.
I’ve grounded turntables, of course, but never had to ground any other audio equipment. Is this likely the issue? If not, where might the buzz be coming from? It seems like a pretty straightforward setup. Any suggestions?