Here's a fun test with earphones/headphones. 2000Hz - 1Hz
I did this with IEMs. I can hear bass till 22Hz, then from 21 to 18Hz I can still hear it but the actual bass resonance effectively seems to disappear for me, and then from 17Hz to 4Hz I hear distant helicopters, and then absolute silence from 3 Hz to 1Hz.
I did this with IEMs. I can hear bass till 22Hz, then from 21 to 18Hz I can still hear it but the actual bass resonance effectively seems to disappear for me, and then from 17Hz to 4Hz I hear distant helicopters, and then absolute silence from 3 Hz to 1Hz.