From alsa-user-owner@alsa.jcu.cz  Fri Oct 23 19:31:00 1998
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Date: Fri, 23 Oct 1998 13:31:26 -0400
From: Paul Winkler <zarmzarm@erols.com>
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To: alsa-user@jcu.cz
Subject: Re: TB Malibu Noisy Channel
References: <19981023160106.4499.qmail@io.nu>
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sterwill@io.nu wrote:
> 
> I've got a new Turtle Beach Malibu card, (a CS4237something), and
> it's working great with the CS4236 drivers, all 15 mixer channels.  :)
> The only problem I'm having is I hear beeps/clicks/noise on the right
> channel when using the PCM channel (playing through /dev/dsp).
> It's almost unbearable when wearing headphones, and really screws up
> a Quake game (not to mention music).
> 
> Is this a matter of re-arranging/shielding the cards in the case
> so that interference is lessened, or is this some other problem?
> I'm just mailing here before I crack the case open.

One thing to try is muting all the channels, and then un-muting them one
at a time to see if you can isolate the source of the noise. Do you
still get the noise if only the PCM and master output channels are
turned on? I get some noise through the CD-audio cable, and through the
synthesizer, and a little bit through the line in if I leave an
unterminated cable attached to it (which I have a habit of doing).

I don't know if there's an effective way to shield a card inside a
computer. Moving it to another slot MIGHT help, preferably as far away
from everything else as possible. But it might not.

PW

