4 ms·

Have you ever put your ear next to an inflated balloon? Gives the same stuffed ear effect for me.

• frabert 7y ago
  This fact makes me suspicious that it might be an instance of comb filtering going on, which is often caused by the interference of a signal being summed with itself with a small delay. It is subtle and may cause the sensation described above, but I'm not really sure.
  • jcims 7y ago
    It's probably related but there seems to be a much wider bandwidth attenuation than you would expect with a typical comb filter phenomenon against a hard surface. It's possible that the round surface is partly responsible for the width of the effect but it's pretty unique in my experience to inflated rubber balloons.