Question about Audio Technica Audio-Technica AT4040 Professional Microphone

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I have a low level hum in the MIC like a motorcyle in mt AT 4040

I have a low level hum in the MIC like a motorcyle idiling 100 ft away for my AT 4040

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Remember this is a condenser mic that REQUIRES phantom power. There are several failures regarding this phantom power delivery that COULD cause your problem.

A "LEAKY" mic cable that is not a fully balanced cable can cause the problem. Test with another cable to exhonorate your cable.

A failure of the input bypass caps in your amp/preamp can cause the input to become unbalanced and let in hum.

A phantom power that is improperly filtered can also cause this. Test using a different source of phantom power.

Remember that you can easily get feedback that may oscillate like hum if you have a monitor speaker anywhere in "earshot" of the mic. They are very sensitive and intended for studio use.

Posted on Oct 04, 2009

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