this is part two since the previous video was shot at midnight so I couldn't play at regular volumes. one of the major sources or confusion is that it's sometimes forgotten that sound is actually just vibration I. e. compression waves with a wave front. This wave has a directional axis which is how constructive interference works and you can create sound lasers.

the lower the frequency the more obvious that sound is just the mechanical transmission of resonance through a medium. there's nothing magical about it that only microphones can detect in fact microphones are notoriously terrible at reliably measuring low frequencies due to the size of the armature which is designed similar to the cartridge of a turn table which for the same reason has a tough time with low frequencies.

the lower the frequency the more its felt and heard until its no longer heard as a tone at all but just felt via various regions in your head and body particularly your chest which is most resonant between 50 and 70 hz and that's why "chest slam / punch" is actually a thing. if an apparatus were designed to simulate a thorax it would be more appropriate for measuring how bass is perceived and that apparatus be comprised of a hollow cavity like a kick drum mic, or pretty much what I whipped together there.

the front wave of a LF pulse aims toward a human body reacts similarly which is why stereophonic bass for music works better than down mix mono beyond just because more division of labor for the subs both leading to a cleaner sound.

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