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Setting-up Bose 901's with Sony Vision Touch STR-G1ES - Humming Problem


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#1 of 2 OFFLINE   ghost88

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Posted November 24 2012 - 11:50 PM

Hi, I inherited a pair of 901 speakers bought in 1969 from the original owner. He also gave me a Sony Vision Touch receiver. I connected the 901's to the Front Speaker input and connected the Bose EQ to the Pre Out/Main In. I'm getting audio fine, but after maybe 10 minutes, a quiet hum will start, and slowly grow until it becomes a full blast noise/hum. Only turning off the system or jiggling the RCA cable coming from the back of the Bose EQ will stop it. Does anyone know what could be causing this? The fact that the hum grows makes it seem like some kind of feedback loop, but then again I don't know much about speakers/receivers. Here is a link to a picture of the back of the receiver. It's not the best quality. http://i.imgur.com/WngSB.png?1 Also, yes I know most of you probably think Bose and the 901's are s*** but if you could just offer me some advice instead of "why bother with such terrible speakers" I would greatly appreciate it.

#2 of 2 OFFLINE   schan1269

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Posted November 25 2012 - 11:49 AM

To rule out the EQ, switch to using the tape loop. IF the hum persists then, then yes...somewhere you are building a ground loop. And, good luck with the ground loop...

#3 of 2 OFFLINE   Tangente190

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Posted December 10 2012 - 12:16 PM

This post can serve as a suggestion to check the other similar issues,
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