Yep. And unknown orientation, etc. All fine and good. Benchmark did the same thing with star quad cables: https://player.vimeo.com/video/155057552Yes, he put an unknown transformer near the cable with unknown field strength.
An uncontrolled experiment like that is great for comparing A vs B, but the wheels fall off when it's then compared to a standard reference (threshold of audible) or to results obtained under different conditions.
Tom