Pierre,
What about the lowest note in a 5-string bass B=30.9 Hz? When I hear a
5-string bass playing this note I am pretty sure I hear that pitch. One
way I could prove it to myself is by playing B one octave above (B=61.8
Hz) and then B=30.9 Hz right after. I am pretty sure I would hear an
interval of an octave between them (I have been musician all my life so I
am pretty confident I know how an octave sounds like). Therefore, I
conclude I can hear a pitch of 30.9.
I guess any bass player would agree with me. Otherwise, why do they bother
paying more for that extra string?
Arturo