Re: [Alsa-user] High-pitched squeal from audiophile card

[Benoit R. <br...@fr...>]

Le lundi 28 janvier 2008 à 22:25 -0600, Wade Nelson a écrit :
> I know this is probably hardware-specific rather than ALSA-specific, but
> I was hoping someone could point me in the right direction here...
> 
> I have:
> Guitar -> Behringer Xenyx mixer -> M-Audio Audiophile 2496 RCA inputs
> 
> When the setup is sitting there, idle and active, there is a very very
> high-pitched light squeal coming from the PC speakers.  It's so
> high-pitched that only myself and so far two other people I've had
> listen can hear it.  However, when I touch my hand to the guitar
> strings, the squeal completely disappears.
> 
> To me this sounds like a grounding issue, but I'm able to reproduce this
> across several different guitars with different pickups & pickup
> arrangements.
> 
> Any ideas?
ideas just for test:
* Which hardware is grounded, which not?
* try invert the socket position on the plug for ungrounded hw...
* try putting a wire between the mass of hw and your ground...