We covered the fastest way to stop feedback in Tip #1 last time. If you missed it, you can read about that here.
This week we cover one of the most effective ways to stop and prevent feedback.
Feedback Tip #2 ...
Most microphones and loudspeakers for live sound are directional. Simply moving a microphone or loudspeaker out of the pickup or projection pattern of the other can greatly reduce the chance of feedback.
Remember our illustration of a feedback loop?
One of the most reliable methods to stop feedback is to move the microphone closer to the source.
This allows more of the audio signal to reach the microphone from the true source than from the reinforced signal of the loudspeakers.
Another common cause of feedback in churches around the world is the improper placement of clip-on lavaliere or "lapel" microphones.
While these microphones can be very convenient for clipping onto a variety of clothing or accessories, they are often placed too far away from the presenter's mouth to be effective for live sound reinforcement.
This is an especially troublesome scenario in small and medium facilities where the presenter, often the lead pastor, is speaking near the main loudspeakers.
These microphones should be placed high on the chest of the presenter. This gets the microphone closer to the mouth and therefore provides a better signal level.
Clip-on and handheld mics positioned too far away will be a major contributor to poor signal quality and potential feedback. I always recommend placing lapel mics about halfway down the sternum, 6-8" below mouth.
Another alternative is to use a headset or earworn microphone. The reason why these are so effective at reducing the chance of feedback is because they are positioned so close to the mouth.
This close proximity of the mic to the source provides excellent "gain before feedback" and will let you get much louder volume levels than if the mic were located farther away.
Alright, we've now addressed two important steps to stopping feedback.
In the next post we'll explore another highly effective method or stopping feedback by using Tip #3.