Shure 520DX User Manual download pdf (Page 14)

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Feedback#N#are#so m e #mics#bette r #th an #o th e r s?#

Feedback is that awful loud screeching, humming or whistling sound a system makes when a

microphone picks up the sound from the amplifier's speaker and sends it back to the amplifier for

further amplification. Every system (i.e. microphone plus amplifier) has a feedback threshold.

Turn the volume up loud enough and feedback occurs. Keep the volume below that point and it

doesn't. The most common cause of feedback is needing more volume than your system can

produce without encountering it! An amp that sounds extremely loud in your living room may be

completely inaudible on stage. So you turn it up. And it feeds back. It is a law of nature. You

can’t bring a knife to a gun fight – whatever your mic/amp combo are – they WILL feedback if

turned up too far!

Unfortunately we often need to have our volume very close to the feedback threshold in order to

be loud enough, and feedback can come and go as conditions change. But some systems are less

prone to feedback than others. And some microphones are less prone than others. Factors

influencing feedback are:

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Believe it or not, microphone choice is not as important as you might think. Many players believe

one microphone feeds back more than another, only because that microphone is

louder/hotter/more sensitive than the other. The only "fair" way to judge one mic vs. another is

to adjust the amplifier's volume so that the sound out of the speakers is equally loud from mic A

to mic B. If mic B is louder to begin with, it will appear to feed back sooner if this isn't done.

With all that said, extremely sensitive mics will indeed be more feedback prone, but I have found

these to be fairly rare among mics I’ve seen. Every once in a while I encounter a bullet mic that

just seems to feed back very quickly compared to others of the same brand and model.

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Shure 520DX User Manual Page 14