tonyteach says, "Mr Buble is a crooner not a singer - ie he needs a mike near his gob to make the voice work"
How do you know that?
There have a number of singers down the years who had very "small" voices; Karen Carpenter was one, as was Julie London.
I suspect Roy Orbison also had a voice that was greatly enhanced with microphone technique.
I would be surprised if Michael Buble belonged in that group, but I must say that when he did his "Audience with..." Tv show in the UK, there was a heck of a lot of "presense" added to his singing voice