[linux-audio-user] Re: The famous "Jack Hum" (Can't record and desparate)

From: Carlo Capocasa <capocasa@email-addr-hidden>
Date: Fri Nov 10 2006 - 20:10:03 EET

> Methinks there is Somewheres (note the forced plural!) in your hardware
> setup one or more pieces with bad shielding and/or bad grounding. The
> problems might not be limited to cabling - they could be something
> inside your hardware.

Me thinksesss this beesss precioussss advicessssss.

> A possible candidate - your fireware audio interface w/ microphone
> pre-amp. It may be originating the hum in the first place, and the mic
> pre-amp makes it really loud.

I have the same problem going over the internal sound card, and it is
more intense there. The odd part is, the lower the latency, the more
intense the hum; and even weirder, I CAN EVEN HEAR THE HUM WHEN THE
COMPUTER IS HOOKED UP TO SPEAKERS THAT ARE TURNED OFF. So you can
actually hear the hum; it's just that whatever sound adapter is hooked
up, firewire or interal, amplifies it.

First I thought it was hard drive noise; but I tried putting Jack's
tempfiles on a ram disk and that had no effect.

Could it actually be that the CPU itself is causing electromagnetic
effects because it has to work so hard?

Curious.

Carlo
Received on Mon Nov 13 04:15:07 2006

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