Feedback is probably the most common problem a church will face with their PA system. This, however, does not need to be the case. With the careful setting up of a graphic equaliser this problem can be greatly reduced if not virtually eliminated.

Feedback occurs when amplified sound from a loudspeaker re-enters a microphone and is re-amplified. Feedback occurs at specific frequencies, sometimes referred to as peaks, in a system. A graphic equaliser allows you to cut these specific frequencies and therefore remove the peaks. You’ll notice that most graphic equalisers have either 15 or 31 ‘bands’. These ‘bands’, each with their own slider, control a range of frequencies within the audio spectrum. With a 31 band unit (also referred to as a 1/3 octave EQ), the frequency range of each slider, or band, is smaller which therefore gives more precise control.

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