When I lived on a substantial hill just outside Nashville, TN, there was so much RF in the air I could pick up radio stations through my cart and tube phono pre- that I had to eliminate any single ended cable and commit to all balanced cable for short runs of 1 to 2 meters. The result was no RF interference. I now live in the upper Midwest with great power sourced locally. RF and other airborne interference is limited here. All of my equipment is true balanced with a balanced run from pre-amp to mono block amps of 3 meters. Absolute silent noise floor. I attribute that to conscientious cable routing and balanced ICs.
