hints for troubleshooting poor sound quality.

Sandy Rutherford sandy at krvarr.bc.ca
Sun Sep 25 17:07:15 PDT 2005


>>>>> On 19 Sep 2005 10:23:07 -0400, 
>>>>> Lowell Gilbert <freebsd-questions-local at be-well.ilk.org> said:

 > George Hartzell <hartzell at kestrel.alerce.com> writes:
 >> I've set up an ASUS small form factor machine based around an P4S8L
 >> ...
 >>
 >> The machine has two mini-jacks, one in the front and one in the
 >> back.  If I plug a set of headphones into the front jack I hear all
 >> kinds of clicks and whirs and buzzing.  They seem to correlate with
 >> drive activity, cd activity, and maybe even the cpu fan.  The
 >> connector on the back seems quieter, but I still hear a bit of
 >> noise.
 >> 
 >> I hear less noise on a set of sony powerer-subwoofer-and-tweeter
 >> speakers, but it's still noticable.
 >> 
 >> ...

 > Well, yes, it *is* electrical interference on the motherboard.  You
 > may be able to reduce its impact, though.  Reducing the amplifier gain
 > (ogain in the mixer(8) output) may help, for example.  Also, does
 > playing digital audio see this effect, or only playing CDs?  If the
 > latter, you can switch to digital extraction for playing CDs (most
 > software doesn't support it, but some does) and avoid the
 > interference.

Would using an external USB audio device be another option?  Last time
that I checked, FreeBSD support for USB sound was not ready for prime
time.  However, I don't know what the lastest state of affairs is.

Sandy


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