Microphone Sensitivity and Feedback: Difference between revisions

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If you restore the level from the speaker by adding more gain at any trim or volume control, the difference between the level of the speaker at the microphone and from the voice is restored.

When the added gain exactly compensates for the reduced ~~mic~~ sensitivity we have the same difference as before. If the microphone fed back at a certain level in the room before, it will do so again at the same level in the room. This is obscured by the other variables that tend to change when we pick a ~~mic~~ with a different sensitivity: different ~~mic~~ frequency response and polar pattern details, different placement, etc.

When the added gain exactly compensates for the reduced microphone sensitivity we have the same difference as before. If the microphone fed back at a certain level in the room before, it will do so again at the same level in the room. This is obscured by the other variables that tend to change when we pick a microphone with a different sensitivity: different microphone frequency response and polar pattern details, different placement, etc.

The only way to get more gain before feedback is to lower the strength of the feedback path (the path between the speaker and ~~mic~~) while the feed-forward path (the path from the voice to the ~~mic~~) has the same gain. The ~~mic~~ has to be in a quieter part of the sound system’s coverage or the ~~mic~~ has to be directionally resistant to the speaker’s sound field compared to how well it picks up the desired input.

The only way to get more gain before feedback is to lower the strength of the feedback path (the path between the speaker and microphone ) while the feed-forward path (the path from the voice to the microphone ) has the same gain. The microphone has to be in a quieter part of the sound system’s coverage or the microphone has to be directionally resistant to the speaker’s sound field compared to how well it picks up the desired input.

So it all comes down to one thing: when there is enough loudness in the room, how much better can the ~~mic~~ hear the desired source than it hears the sound system? Sensitivity doesn't enter into this equation.

So it all comes down to one thing: when there is enough loudness in the room, how much better can the microphone hear the desired source than it hears the sound system? Sensitivity doesn't enter into this equation.

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 If you restore the level from the speaker by adding more gain at any trim or volume control, the difference between the level of the speaker at the microphone and from the voice is restored.
-When the added gain exactly compensates for the reduced mic sensitivity we have the same difference as before. If the microphone fed back at a certain level in the room before, it will do so again at the same level in the room. This is obscured by the other variables that tend to change when we pick a mic with a different sensitivity: different mic frequency response and polar pattern details, different placement, etc.
+When the added gain exactly compensates for the reduced microphone sensitivity we have the same difference as before. If the microphone fed back at a certain level in the room before, it will do so again at the same level in the room. This is obscured by the other variables that tend to change when we pick a microphone with a different sensitivity: different microphone frequency response and polar pattern details, different placement, etc.
-The only way to get more gain before feedback is to lower the strength of the feedback path (the path between the speaker and mic) while the feed-forward path (the path from the voice to the mic) has the same gain. The mic has to be in a quieter part of the sound system’s coverage or the mic has to be directionally resistant to the speaker’s sound field compared to how well it picks up the desired input.
+The only way to get more gain before feedback is to lower the strength of the feedback path (the path between the speaker and microphone ) while the feed-forward path (the path from the voice to the microphone ) has the same gain. The microphone has to be in a quieter part of the sound system’s coverage or the microphone  has to be directionally resistant to the speaker’s sound field compared to how well it picks up the desired input.
-So it all comes down to one thing:  when there is enough loudness in the room, how much better can the mic hear the desired source than it hears the sound system? Sensitivity doesn't enter into this equation.
+So it all comes down to one thing:  when there is enough loudness in the room, how much better can the microphone hear the desired source than it hears the sound system? Sensitivity doesn't enter into this equation.