Nothing wrong with theory and speculation as long as no-one is pretending they are anything more than that.In both cases (UAP and 'magic in audio') there will be no 'hard evidence' but lots of theories and speculation.
I notice on this thread some people are assuming that if someone theorises or speculates then they must 'believe.' That's simply not the case. I'm highly sceptical but still happy to theorise and speculate about this subject.
Audio, less so, since we are dealing there with a much more constrained topic. I can accept there can be unknown unknowns about the nature of reality, but not about varying a voltage into a magnet to make a cone vibrate.