Their wedge shape often leads to them being called monitor wedges or sometimes just plain wedges.Ī good monitor speaker is very directional, and so can be pointed away from the front of a microphone (which is sensitive to sound) and towards the rear of a microphone, which (if it's a cardioid microphone), rejects sound. It's here, where we now need specialised speakers called monitor speakers we've all seen these at the front of the stage. Cardioid or Unidirectional microphones assist in this greatly, as they allow an engineer to point the microphone towards the sound source and away from the PA system. To stop feedback, we need to control very carefully what sound is allowed to enter any microphones that are on the stage.
The amplified sound gets reamplified and continues to the point where it causes a feedback loop. We've all heard it before that horrible shriek or howl which leaves us with painful ears. Feedback occurs whenever enough of the amplified sound from a microphone re-enters the microphone again. With all that power though, came another problem - feedback. In time, as live sound became more sophisticated, PA systems got big enough for large stadiums. Back in the early days of live bands, when PA systems were rudimentary affairs, a band was lucky to have a couple of column speakers either side of the stage so that the vocalist might stand a chance of being heard over the drummer!
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