“How Do Feedback Suppressors Work?” Feedback occurs when a the sound system cannot amplify acoustic signals any louder. Having microphone(s) in front of the loudspeaker(s) will allow this to occur at relatively low levels. When the feedback occurs, it will happen at one frequency at a time. This frequency is where some part of the system (or environment) is resonant. All things in nature have these resonant frequencies. A good example is a portable stage. When you walk across it, you will hear your steps at the same frequency. This is the resonant frequency of the stage. A more dramatic example of resonance is when you see a glass break when stimulated at the correct frequency shown in the video below. The reason to show this was to illustrate that if we can suppress these resonant frequencies, we can increase gain, or loudness from the sound system. Feedback suppressors “listen” or detect these resonances and apply filters to reduce the level at this frequency. Since there will always be more than one resonance in the sound system (remember, this could also be in the environment the sound system is in as well). Yamaha offers feedback suppression on several products. The EMX5016CF Powered Mixer offers both an automatic and a manual mode for engaging the filters and our STAGEPAS 400i and STAGEPAS 600i PA Systems offer the feature automatically as well. All the units above offer 7 different filters that are automatically applied as needed. Since these systems are often used by less than professional operators, or the musician more concerned with his music, this feature comes in really handy. Please share this if you find it interesting, and we’ll post more soon!
Posted on: Tue, 28 Oct 2014 20:00:01 +0000
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