2. home-theater
  3. 1284774715

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
10 responses Add your response
richardfinegold
196 posts
 
Did you try using an inexpensive hum buster?
mike1000
71 posts
 
This happens often with Direct TV. The service has not been properly grounded. Call them back to fix it.
pep21
59 posts
 
Call the sat company and tell them about it.
They will come out and fix it free.
Its their problem their equipment, not yours.
I like to dispatch them on a regular basis, seeing that they raise their prices on a regular basis!
Post removed 
chadnliz OP
3,736 posts
 
The phone line didnt work, I wonder if its the way he has it stacked, on top of guitar amps and such (everything is in one big stack) could that be an issue?
He isnt an audio guy so I cant blame him but I would like to give my friend a little better sound. Thanks
darrylhifi
498 posts
 
Any way to move the equipment a few feet to the left or right. Tricky one since you lifted the ground.

As the years have passed we now have wireless routers , wire phones etc, wonder if it might just be in the path of a related or non related wireless signal.
chadnliz OP
3,736 posts
 
That phone line is a awesonme idea, if it isnt that then I am stumped. I will try that when I get back over to his house this weekend. Thanks for the idea!
theo's avatar
theo
2,688 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.
jea48
4,425 posts
 
I got a high pitch faint but annoying hum thry speakers.

I don't think the problem is a earthed ground loop problem.A 60 hertz ground loop hum is not high pitched. It is a 60Hz low level hum.

Is it possible you are getting a feedback loop somehow?
swampwalker's avatar
swampwalker
5,138 posts
 
ground loop thru cable co-ax? Try ground isolation transformer on the co-ax. A good trial is to put two of those 300 ohm to 75 x-formers back to back. co-ax to 75 ohm to 300 ohm to 300 ohm to 75 ohm to co-ax.
Log in to respond
More to discover
80x80
SVS PB1000PROBA
SVS PB-1000 Pro 12" Ported Subwoofer SVSPB1000PROBAOB
80x80
Revel REVB112V2BLKAM
80x80
JL Audio Fathom 212 V2