71 dB
Headphoneus Supremus
Our spatial hearing compares the sound heard by left and right channels. If you have say 108 Hz sinewave playing on left ear and 112 Hz on right ear (binaural listening with headphones so that the channels don't leak to "wrong" ear) our spatial hearing with detect a binaural beat of 4 Hz (112 Hz-108 Hz). Our hearing detects the stereophonic signal goes in-phase and out of phase 4 times a second. This also creates a feeling of the sound moving around, but it is pretty fuzzy, even annoying feeling as the spatial cues in this case not only simplistic, but also totally unnatural.
Apparently our brain pulsates at different frequencies and different binaural difference frequencies affect us differently, but this is neuroscience, something I have zero expertise of so I won't go into it.
Apparently our brain pulsates at different frequencies and different binaural difference frequencies affect us differently, but this is neuroscience, something I have zero expertise of so I won't go into it.