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Direct TV and digital hum problems

Hello,
I hooked up a digital 5.1 reciever for a non audio bud tonight I donated to him. When I hooked up his Sat box via Roslink I got a high pitch faint but annoying hum thry speakers. I figured I would try dig coax and same result. I lastly hooked it up for Pro logic and no hum but its not digital as I had hoped to give him.
I lifted the ground, checked the ground at the junction amp in basement and all settings were verified.
I am by no means new at this, I have over $50k in my home theater and have done surround for over 15yrs all along being a DIY installer (I am also the nerd everyone calls for help.........and am pretty good at it too :)
My point is that I have tons of experience and just cant figure this out, hope some ideas come my way..........thanks all!
chadnliz

Showing 1 response by theo

theo's avatar
theo
2,706 posts
 
Is this the only digital input being used on his pre/pro.
If it is try a digital connect to his CDP, it may be his Pre/Pro. One other thought is phone line, did you hook up the phone line as DTV so loves us to do. Disconnect it and see what happens, but my first thought is the Pre/pro is generating a hum withing the digital to analog circuitry.
Not an expert here just have had DTC for about 12 yrs and this is a thought of something to try.
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