:)
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I think you need to read this https://courses.lumenlearning.com/bo...ity-and-level/
I worked in a sound and vibration lab and we would test for all sorts of sound emitting objects, including ships horns, loudspeakers, objects in industrial environments causing hi levels of noise and high frequency (ultrasound), low levels of vibration on building sites(infrasound) and so on. We also had a very rigorous environment and tests for humans. Human beings are physically unable to hear/perceive anything beyond 22khz max (and actually anything much above 18khz is a rarity). So unless you are morphing into a bat forget it.
My daughter is an audiologist. Apparently bone conduction happens up to 50khz. And this can bypass the middle ear and hit the inner ear. So although you cannot hear frequencies above 20khz (limited by the middle ear) via air conduction, it is conceivable that the brain perceives, though not through ‘hearing’, frequencies above 20khz. This would perhaps help to explain why super tweeters make a difference to the sound?
My speakers go right down to zero hertz. In fact they are delivering 0Hz right at this minute.
This is good stuff gents keep it coming :)
Now someone mentioned infrasonic, which are sound waves below 20Hz, these have a seriously long wave length to fully form (20hz is pretty close on 18m not sure many of us have rooms that long :lol:), you would 'feel' these as opposed to hearing them.
A few years ago now I was have a tour around Cabasse's facility in Brittany, particularly the anechoic chamber by Bernard De Bail (sure that was his name!) their chief designer the we were discussing sample rates and frequency response of a project they were working at the point in time.
Anyway the upshot was he demonstrated a 16hz waveform in there, that caused your chest to behave in a very strange manner shall we say, the SPL on your body was pretty intense and boy you were really feeling it. NOT hearing it
May be of interest.
Further reading
A drop more
Real world instrument frequency measurements
I don't see what all the 'we actually hear like bats...maybe -' has to do with the grounding boxes anyway. Not discussing it anymore. I'm waiting for the THD+N measurements. Not that it proves anything either way but it is still interesting and relevant.
You miss the point, it's not hearing like bats, it's perceiving. It's really not the same thing. This perception probably adds to the overall experience.
Grounding boxes may free up clutter to allow this perception to take place. Or gounding boxes may be a device of Satan....hard to know.