Prevent Feedback in Karaoke DJ Equipment

Prevent Feedback in Karaoke DJ Equipment

By Christine Sheridan

What is feedback? Feedback can happen whenever you have a sound system with a microphone (or an instrument) and amplified speakers. It occurs when speaker sound gets picked up by the microphone (or instrument pickup), reamplified, and sent through the speakers again and again in a screeching or howling loop.




Why does feedback happen? Technically speaking, feedback happens when the gain is too high on the output of a microphone. Lots of factors might figure into a feedback problem but the arrangement of your system components is a major factor in persistent feedback. Correct placement of speakers in relationship to a microphone or instrument will end most feedback troubles.



Here are some common causes of feedback:

  • Live microphones are pointed in the direction of the amplified speakers.
  • The microphone and the amplified speaker are too closepro31a.
  • The person holding the microphone steps in front of the speakers2.
  • The directional nature of the microphone – unidirectional microphones are less likely to cause feedback than omni-directional microphones.
  • Pointing microphones at each other.
  • The echo caused by acoustically reflective surfaces within the room – too many echos equals more feedback.
  • The presence of multiple microphones and amplified speakers – the more equipment you’ve got the more likely you are to accidentally create feedback.
  • The singer holds the microphone too far away, forcing the karaoke DJ to crank the volume on the microphone which increases the chance of feedback.


What is the best fix for feedback? Proper arrangement of your equipment will cut out 95% of feedback. Unfortunately, you can’t always arrange your system perfectly or control the sound environment 100%. Sometimes the option for speaker placement, especially, is non-negotiable. Therefore the following suggestions are ideal scenario solutions but not always possible.


genius-2channel-speakers-blackwoodPlace speakers in front of the microphones (and instruments) or
Point the speakers away from the person singing – 180 degrees is ideal, but not always realistic
Don’t point live microphones at each other
Hold microphones closer to the mouth so the volume can be turned down
Avoid cupping the microphone with your hands
Turn off microphones or other equipment that is not being used
Use uni-directional microphones – an omni-directional wireless microphone set is cool but it creates more feedback issues
Soundproof the room – reduce the amount of echo to reduce feedback through the microphone
If you have an equalizer lower the specific feedback frequency causing your problem – 400K is a common trouble spot


If you just can’t change your system arrangement enough to control the feedback loops you can add a relatively inexpensive piece of karaoke DJ equipment to your system called a feedback controller. Sometimes called feedback destroyers or feedback ferrets, these controllers can automatically detect a feedback loop forming and set very narrow notch filters to the squelch the problem frequency. It works like a jacked up graphic equalizer you don’t have to adjust by hand. It may be the best solution when you are getting uncontrollable feedback in live sound applications like machine karaoke shows.


Article Source: Prevent Feedback in Karaoke DJ Equipment