
We have all had it at one point or another on a sound system. What is feedback? What does it sound like? Feedback is where a microphone interacts with a loudspeaker causing a loop between itself and the loudspeaker. The sound gradually gets louder and louder and can potentially cause damage to your speakers! Feedback in most cases is in the higher end of the sound spectrum and to simplify is sounds like a very high pitched squeal (unpleasant for many who have to hear it)
So how is feedback caused? Feedback can be caused by microphones and instruments. For example. Lets say you have a microphone that is quite near a speaker. Someone goes to speak into the microphone. The microphone volume is quite high and starts picking up the loudspeaker. This is how feedback begins. Now lets look at an instrument. You have a bass guitar. You have left the volume up on it and place it against the amplifier and one of the strings is still vibrating and coming through the amp. The amplified noise coming from the amplifier will interact with the string and eventually get louder and louder.
So how do I stop feedback? There are two very good methods which will help to reduce feedback in your church. Firstly, make sure your speakers are in a suitable position for your audience and at the same time, not too close to your microphones and instruments. Secondly, the use of a graphic equalizer can help reduce feedback significantly in your building. A graphic equalizer allows you to reduce a certain frequency on your sound system. Some graphic EQs will have lights on them which will show the frequency of the feedback as it happens. This allows you to pinpoint the offending frequency and reduce it in your mix.
Are you having feedback problems in your church? Call us today to arrange a site visit!
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