"...No, there are no RCA without ground..."
I use a product similar to this in my hum busting kit. They help isolate the problem.
https://www.conferenceroomav.com/p/hall-research-gli-rca?gclid=EAIaIQobChMImJvSo4zk7QIVkxx9Ch2H4Q3AE...
I use a product similar to this in my hum busting kit. They help isolate the problem.
https://www.conferenceroomav.com/p/hall-research-gli-rca?gclid=EAIaIQobChMImJvSo4zk7QIVkxx9Ch2H4Q3AE...