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Author Topic: A.V. Hum  (Read 2644 times)

edeyo10

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A.V. Hum
« on: October 15, 2008, 05:47:52 pm »

We have a DVD player hooked up to our sound system, it is also hooked up to a projector. As soon as the projector gets hooked up there is a hum that drowns out the audio. It happens on all types of connections to the projector. Is there a way to filter this. Please contact me if I failed to describe my problem well enough.

Thanks,

Erik
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Arnold B. Krueger

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Re: A.V. Hum
« Reply #1 on: October 15, 2008, 08:51:33 pm »

edeyo10 wrote on Wed, 15 October 2008 22:47

We have a DVD player hooked up to our sound system, it is also hooked up to a projector. As soon as the projector gets hooked up there is a hum that drowns out the audio. It happens on all types of connections to the projector. Is there a way to filter this. Please contact me if I failed to describe my problem well enough.


This is a classic ground loop. Were I in your place, I'd pick up a Radio Shack ground isolator:

http://www.radioshack.com/sm-buy-the-ground-loop-isolator-on -http-wwwradioshackcom--pi-2062214.html

If you don't want to do that, try using a direct box.


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edeyo10

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Re: A.V. Hum
« Reply #2 on: October 16, 2008, 09:50:11 am »

Arnold B. Krueger wrote on Wed, 15 October 2008 20:51

edeyo10 wrote on Wed, 15 October 2008 22:47

We have a DVD player hooked up to our sound system, it is also hooked up to a projector. As soon as the projector gets hooked up there is a hum that drowns out the audio. It happens on all types of connections to the projector. Is there a way to filter this. Please contact me if I failed to describe my problem well enough.


This is a classic ground loop. Were I in your place, I'd pick up a Radio Shack ground isolator:

 http://www.radioshack.com/sm-buy-the-ground-loop-isolator-on -http-wwwradioshackcom--pi-2062214.html

If you don't want to do that, try using a direct box.





Thanks, I'll try that.
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Tim Padrick

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Re: A.V. Hum
« Reply #3 on: October 18, 2008, 02:21:55 am »

Greg Hertfelder

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Re: A.V. Hum
« Reply #4 on: October 19, 2008, 09:54:59 pm »

The classic response is to insert a  direct box with RCA input jacks between the DVD player and mixing console.

A second solution is to isolate the power of the DVD player from all other power with an AC isolation transformer.
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