Not to me. I measure intermodulation, albeit at very very much higher frequencies! When you 'mix' two frequencies, audio, HF, RF or microwave, or even light, you get the two originals plus their 'sum' and their 'difference'....................
Most certainly but the most fascinating fact is that the human ear is a wonderful mixer and it automatically selects, emphasizes, etc. the lowest frequency product.
Fascinating in my book.
When I learned this I said “bullshit”....I actually took two oscillators and speakers at the frequencies mentioned and I padded them into a summing pad. The dial tone appeared and I was a believer.
You must be in telecom....wireless for mobile phones and base towers, huh?
Have you ever heard the term -153 DBC?