[linux-audio-user] Pre-Amp hum (related to jack, somehow)

david gnome at hawaii.rr.com
Tue Nov 28 12:45:13 EST 2006

Carlo Capocasa wrote:
> The irony of this is killing me. I had a singing capacitor in my
> notebook computer, which I was able to solve using a load generator at a
> low scheduling priority. However, that same capacitor is what had
> triggered me to get a higher-end sound card in the first place.
> Now this higher end sound card has quite a loud hum when the phantom
> power for its mic pre-amps is on. Interestingly, when I mix the signals
> from both pre-amps by connecting them both to the same outputs in JACK,
> the noises from the Mics cancel each other out.

Sounds like a defective sound card to me. Can you still get warranty 
service on it? Chances are they'll readily swap it for a new one.

Or you still have somewhere in your setup a grounding problem ...

Just guessing, haven't any real knowledge myself.

gnome at hawaii.rr.com
authenticity, honesty, community

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