Question to audio experts... background noise

[William Park]

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?

-- 
William


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