Actually, I used the term "stage" as a general word to define whatever performing area one might be working from. Sorry for the lack of clairty on that point.
In general, because I am primarily a close up worker, I work from a table on a slightly raised platform (for better visibility to a crowd) and not a formal stage.
In my experience (only about 23 years, so the esteemed Rev. Lewis might have some time on me there), I have found that having a mic and sound system do a number of things for a performer, which I listed in a prior post.
The main thing, however, is that it saves on one's voice. My minor in college was vocal music, so I am well trained in proper projection, ennunciation, diction and pronunciation, not to mention breath control and vocal placement.
However, in the din of the usual large trade show, even such techniques may not be enough. Add the generally dry air and, in my case, long performing hours (Like the great Eddie Tullock, I do not leave my post except for the rare visit to the plumbing and for a short lunch break), the wear and tear on even the most well trained and seasoned set of vocal chords can be deadly.
Having a sound system saves on wear and tear on the voice. Improper use of the voice can lead to polyps, which may force one to a surgical remedy which can further damage the speaking and singing voice, depending on placement and severity of the polyp structures.
So, to avoid what amounts to repetitive stress injuries to my vocal chords, to make sure that I get the message across to the crowd and for the sake of clairty, I use a sound system.
Over the years, I have noticed that when I don't use one, the responses are not as favorable and that it makes what is already a tiring work situation even moreso. Maybe it's just me. ;)
Different people feel differently and I can accept that.
It's only my style and my suggestion to someone who is looking to enter this competitive and lucrative venur for our Art, not something that I feel is graven in stone and sent from on high! :whack:
Lee Darrow, C.Ht. http://www.leedarrow.com