Question to audio experts... background noise

[Jamon Camisso]

William Park wrote:
> Hi all,
> 
> I don't have much experience with what is normal for sound card.
> So, I thought I should ask audio experts here...
> 
> I get high-frequency background noise when I plug in my earphones
> directly into "front line-out" (green) of integrated sound card.  I can
> hear the noise change as I move mouse, type something on keyboard,
> or do something on screen.  My guess is "grounding" problem.  But,
> when I plug in my external 2.1 speaker system, the high-pitch noise
> becomes noticeable only at max volume.
> 
> Is this normal for all sound card or just integrated ones?
> Maybe one shouldn't plug earphones/headphones directly into front
> speaker jack?
> 

I'm not an audio expert, but every component in the chain has an effect.
I have a headphone jack on my speaker volume control -- the control is a
4' piece of wire that must be just the right length, because I can
distinctly pick up what sound like AM/FM radio signals if i turn the
volume way up with no sound. But onboard audio is fine..

Jamon
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