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Junior Varsity
Microphone impedance
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<blockquote data-quote="Paul Johnson" data-source="post: 217699" data-attributes="member: 2643"><p>You are confusing us? What has speaker impedance go to do with this? Each mic has a nominal output voltage. Lower output equals lower level to the amp. if one mic doesn’t work, this is nothing to do with impedance matching. Almost certainly it’s to do with the polarising voltage. If you’ve been looking at the wiring, some mics have the screen and one conductor, others have a screen and two conductors. Some have audio and 5V on just a single conductor, others have the 5v separate. My guess is that somehow you have lost the 5v from where the mic expects it.</p><p></p><p>impedance is just about matching. A device is designed to work into a specific circuit impedance. You get a good or bad match. Get it wrong and you might find level gets reduced and often frequency response. In general, lower impedance sending to higher impedance inputs is better than the other way around. So a 150 Ohm mic into a 600Ohm input is not worth thinking about. An ancient 25Ohm mic into a high impedance guitar amp will probably be silence, it’s virtually a short circuit.</p><p></p><p>your silence is wiring.</p></blockquote><p></p>
[QUOTE="Paul Johnson, post: 217699, member: 2643"] You are confusing us? What has speaker impedance go to do with this? Each mic has a nominal output voltage. Lower output equals lower level to the amp. if one mic doesn’t work, this is nothing to do with impedance matching. Almost certainly it’s to do with the polarising voltage. If you’ve been looking at the wiring, some mics have the screen and one conductor, others have a screen and two conductors. Some have audio and 5V on just a single conductor, others have the 5v separate. My guess is that somehow you have lost the 5v from where the mic expects it. impedance is just about matching. A device is designed to work into a specific circuit impedance. You get a good or bad match. Get it wrong and you might find level gets reduced and often frequency response. In general, lower impedance sending to higher impedance inputs is better than the other way around. So a 150 Ohm mic into a 600Ohm input is not worth thinking about. An ancient 25Ohm mic into a high impedance guitar amp will probably be silence, it’s virtually a short circuit. your silence is wiring. [/QUOTE]
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