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The reason the 510 mic won't work on the Cobra 25 and 29 is because the 510 mic uses a condenser element. The condenser elements need a small amount of voltage for them to function. The Cobra 25's and 29's do not provide this voltage. The audio circuits in the 25's and 29's are setup to run dynamic mic elements, which are about 600 ohms in most cases. Condenser mics can have anything from 20k ohms to 500k ohms. Hope this helps!

 

 

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