Noise in audio line out

  • Thread starter Thread starter Sunil Pawar
  • Start date Start date
S

Sunil Pawar

Hi Everybody,

I want to connect my Sony Stereo Audio System instead of stere
speakers. When I connected to lineout of my pc through stereo 3 pi
it results in strong noise/humm on both channels (L & R ). Stil
music can be heard on sony system but with noise. This doesn'
happens with amplified stereo speakers or headphones

This problem arised recently. Earlier it was working fine

I have checked
1. Connecting Cable - o
2. CD Audio system - ok (connected to diff O/P device -TV
3. Audio Connections on mb -Intel 865gb

Pls help me out ! :
 
feedback ground loop maybe is the stereo plugged into the power strip of
the computer or have you changed where you plugged in the Sony?
 
Hi Everybody,

I want to connect my Sony Stereo Audio System instead of stereo
speakers. When I connected to lineout of my pc through stereo 3 pin
it results in strong noise/humm on both channels (L & R ). Still
music can be heard on sony system but with noise. This doesn't
happens with amplified stereo speakers or headphones.

This problem arised recently. Earlier it was working fine.

I have checked
1. Connecting Cable - ok
2. CD Audio system - ok (connected to diff O/P device -TV)
3. Audio Connections on mb -Intel 865gbf

Pls help me out ! :(
Click to expand...

Does the Sony have a,"Line-in"?
 
Sunil said:
Hi Everybody,

I want to connect my Sony Stereo Audio System instead of stereo
speakers. When I connected to lineout of my pc through stereo 3 pin
it results in strong noise/humm on both channels (L & R ). Still
music can be heard on sony system but with noise. This doesn't
happens with amplified stereo speakers or headphones.

This problem arised recently. Earlier it was working fine.

I have checked
1. Connecting Cable - ok
2. CD Audio system - ok (connected to diff O/P device -TV)
3. Audio Connections on mb -Intel 865gbf

Pls help me out ! :(
Click to expand...

Sounds like ground loop induced hum.

The PC will be connected to earth ground and it's likely the Sony is too
but if the grounds are not the same, like different AC power line paths,
the ground difference introduces hum.

Defective/noisy surge protectors can cause that as well.
 
You have what is known as "ground loop" hum. A ground loop in your
situation occurs when you hook up a computer's sound output to a separate
stereo system. The two systems are plugged into different outlets and have
an existing small ground voltage difference between them. This voltage
difference causes the Hum.
The only solution is to buy, from a good audio dealer, a ground isolation
transformer and have the dealer tell you where to install the transformer in
your wiring.
I had the same problem, and cured it this way, as others have.
 
Sunil Pawar said:
Hi Everybody,

I want to connect my Sony Stereo Audio System instead of stereo
speakers. When I connected to lineout of my pc through stereo 3 pin
it results in strong noise/humm on both channels (L & R ). Still
music can be heard on sony system but with noise. This doesn't
happens with amplified stereo speakers or headphones.

This problem arised recently. Earlier it was working fine.

I have checked
1. Connecting Cable - ok
2. CD Audio system - ok (connected to diff O/P device -TV)
3. Audio Connections on mb -Intel 865gbf
Click to expand...

Have to agree with the others on the issue being power related, i've also
noticed laying audio cable alongside AC wiring, such as extension cords,
power supply cords etc etc etc can impart a hum, usually around 60hz or so.
I know my cell phone imparts a buzz anytime i have it on the desk
(glass/metal desk), strangely its not AC electrical, but i'm sure the
tranciever in there is doing the deed for me. Try rerouting the audio cable
as well when you fiddle with the power. Try to keep the cable away from
transformers, flourescent lights, etc as i've noticed these can really push
a pulse into the line. Do you have capacity for a DIGITAL connection
between the two? Coax digital signals are a LOT less perturbed by the
electromagnetic environment they run in (even if you use a cheapass cable!),
and fiber is as clear as the cable it runs through (ie stay AWAY from cheap
ass fiber cables unless your system is cheapass overall).
 
I'm coming in late and haven't read all of the threads leading up to this
point.

A while back I had an audio scratchiness problem. I was running Windows
Media Player 9. Someone here suggested upgrading to WMP 10. That solved the
problem.

Ed Cregger
 
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