Inspired by: http://www.giantbomb.com/forums/off-topic-31/how-tall-is-tall-1423899/#67
Personally I have an extremely deep voice, though obviously I can't really tell and don't listen to recordings of my own voice all that often; but it's probably amongst the top 5 or so of anyone I've ever met (say roughly 20000 people). The best anecdote I could give is from when I worked at McDonald's during college, naturally I got a ridiculous number of people telling me to get into radio (and a few short lived opportunities therein), which I suppose could have been a potential career path for also not finding a job. However there was this one guy who said essentially "I was expecting this giant dude, with huge hands (like Michael Clarke Duncan I suppose), then I got you." I'm 6'1 and relatively thin though not altogether unimposing, but I'm certainly not MCD, God rest his soul.
I guess Obamadeep is probably the threshold for me, though for anyone who doesn't have a deep voice nor an accent as long as they don't sound incredibly nerdy they all sound relatively similar to me; I can recognize voices but distinguishing their depth is fairly difficult above a certain range.