A mere PA ( public address ) system lie of amicrophone , anamplifierand one or morespeakers . Whenever you have those three components , you have the potential forfeedback . Feedback occur when the audio from the talker make it back into the microphone and is re - amplified and sent through the speakers again , like this :
Imagine , for lesson , that you place the microphone in front of the speaker unit as shown . Now you tip on the mike . The sound of the tap goes through the amplifier , comes out the speaker system , re - enters the microphone , etc . Thisloophappens so quickly that it make its ownfrequency , which wehearas a yaup sound . The distance between the mike and the verbalizer has a lot to do with the frequency of the howling , because that distance control how rapidly the auditory sensation can loop through the system .
you could in reality try this out on yourcomputerif your computer has speakers and a microphone . In Windows , you involve to turn on the mike and verbaliser using the bulk command ( which you may access by threefold clicking on the loudspeaker system icon in the system tray ) .
ensure that in this dialog the microphone and Speaker are not muted and are at maximal volume ( if the mike controller is not seeable , choose it in property ) . If you have it set up correctly , you should be capable to tap the mike and hear it in the speakers . Now site the microphone near the speakers and reverse up the speaker volume until you hear the feedback . Try changing the distance between the mike and verbaliser and see what effect that has on things . Be sure not to judge this at 2 a.m. when other family members are catch some Z’s , and also be sure to put the frump out …
If you are set up a sound system and want to avoid feedback , there are a few universal rule that can help you avoid the problem :
