It may well be that signal-to-noise ratio (STN) is the single most important issue in live audio, and nowhere does it topple your 'audio Jenga' more than in conferencing. Forgotten what it is for the moment? Simply the blend of good signal (in this case, voices) with background noise down a mic channel: 80 per cent voice to 20 per cent hiss, hum and general acoustic flatulence is obviously much better than 50 per cent of each, especially as both will get louder if you turn it up.
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