There are three basic means of feedback elimination. The first and most common technique is careful placement of microphones.  It is very possible that with a stationary set up an audio engineer can set up the microphones in such a way that feedback is very unlikely.

Another way is through the adjustment of Equalization levels and overall gain of a system.  If the frequency only has a gain loud enough to hear in the audience, but not enough to reflect back to the mic with any significant amount of power then no feedback will occur.

The last way, is to use a feedback suppression system much like the one we designed, however until recently all of these systems were analog and thus cut out a large portion of the speech.   

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