[Bug 129613] low buzzing or hissing noise when using high quality headphones

[Scott Wheeler]

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http://bugs.kde.org/show_bug.cgi?id=129613         




------- Additional Comments From wheeler kde org  2006-06-22 03:08 -------
For what it's worth, and while we're making generally unqualified speculations, when I've seen stuff like this (as a studio headphone junkie), it's usually mismatched mixer settings.  The gain is up very high on certain channels, which picks up RF interference (some of which is generated by the computer itself).  It doesn't help that Linux's mixer UIs generally suck.

Try muting all of the channels that you're not using and turn the gain down to 50-80% on the channel that you're using (PCM, specifically).  If there are "switches" that you can toggle in KMix, see if any of them have a significant effect.