I'm a basso profundo and can (with a good warm up) go from Bb, just over an octave below Middle C ti Eb just a bit over octave above Middle C. No macho male likes singing falsetto but I find that a lot of sadistic composers insist on writing bass parts that go way above the top of the bass clef, where I can hit Bb.

Ive had a good experiment witH it tonight and can whistle the two octaves from Eb below Middle C to the Eb in the octave above Middle C. I can blow till I'm blue in face but I can't get above that Bb for love or money.

And just to add another intersting dimension to the equation, I find that I can whistle a semitone tone lower in my bass register if I inhale and whistle - my 'suck' range is a bit lower at the top end - but I haven't measured it. I not that if I block my nose when suck whisling that the technique falls in a heap.(What stimulated this thread was a conversation last night with my 7 year old nephew who learned to whistle by inhaling).

While I'm at it I might as well pose the question of (my words) 'yodel whisling'. I think that it's a mimic of some bird song where the note trills automatically. Unlike yodelling it doesn't happen for me at the top of my range, but occurs somewhat lower. A colleague of mine from 20 years back used to do it and it sounded fabulous. I was too stubborn to ask him how he did it, but finally I latched onto the technique. (I can't remember the word for it - but is 'carroling' the song that male canaries make.

JiK's message was pretty impressive, so I'll look forward to a physics analysis of inhaling.