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Before we even start to look at mics, we need to take a quick look at what might be the scariest aspect of running an audio mixer for a show—feedback. Now you’ve all heard it, but might not know what it was called. Feedback can be acoustical or
mechanical
Mechanical feedback is most often created by a vibration coming up a mic stand holding an open mic, just from having your system up too loud and nothing running through it. It’s that hum that starts low and slowly gets louder, like this. That is mechanical feedback. Acoustic feedback is more common and occurs when amplified sound from ______ get back into a microphone, and that sound gets re-amplified again and again in a kind of loop, and the result is that horrible screech that makes the audience cover their ears, and makes the FOH audio engineer want to run out of the building to escape all the dirty looks from the audience. Feedback is probably more common at higher frequencies, but can happen in the low frequencies as well. Feedback can be caused by many things, but it is always sound from ______ getting back into microphones, and then the audio ugliness begins. One way or another, feedback always comes down to a microphone picking up sound from
speakers
There are loads of different microphones for different situations. But they all have one thing in
common
Feedback is probably more common at higher frequencies, but can happen in the low frequencies as well. Feedback can be caused by many things, but it is always sound from ______ getting back into microphones, and then the audio ugliness begins. One way or another, feedback always comes down to a microphone picking up sound from
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Acoustic feedback is more common and occurs when amplified sound from ______ get back into a microphone, and that sound gets re-amplified again and again in a kind of loop, and the result is that horrible screech that makes the audience cover their ears, and makes the FOH audio engineer want to run out of the building to escape all the dirty looks from the audience. Feedback is probably more common at higher frequencies, but can happen in the low frequencies as well. Feedback can be caused by many things, but it is always sound from
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Study Notes
Feedback
- Feedback is the scariest aspect of running an audio mixer for a show.
- There are two types of feedback: acoustical and mechanical.
Mechanical Feedback
- Caused by a vibration coming up a mic stand holding an open mic.
- Occurs when the system is too loud and nothing is running through it.
- Results in a hum that starts low and slowly gets louder.
Acoustical Feedback
- Occurs when amplified sound from speakers gets back into a microphone.
- The sound gets re-amplified again and again in a loop, resulting in a horrible screech.
- Feedback is more common at higher frequencies but can also occur in low frequencies.
- Caused by sound from speakers getting back into microphones.
Common Causes of Feedback
- Sound from speakers getting back into microphones.
- Various factors can contribute to feedback, but it always comes down to a microphone picking up sound from speakers.
Microphones
- Different microphones are suited for different situations.
- All microphones have one thing in common: they can pick up sound from speakers, leading to feedback.
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Description
Test your knowledge of sound reinforcement in theatre with this quiz on identifying and avoiding feedback. Learn about acoustical and mechanical feedback and how to manage them in a live audio mixer setting.
