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

[Steve Fosdick]

On Tue, 28 Nov 2006 17:36:27 +0100
"Marc-Olivier Barre" <mobarre at gmail.com> wrote:

> I also ran into some problem with my laptop. Those things are known to emit
> a lot of EM waves which easily get caught by cables transmitting asymmetric
> signals. When I switched all my connections between my sound card (RME) and
> my pre-amp (TL-Audio) to symmetric XLR, the hum disappeared.

I had a hum problem with a Tascam US-122.  I wanted to record a singer and guitar that had an integrated pickup.  The singer's mic was a condenser and so needed phantom power so I had phantom power on, but I also had the guitar pickup plugged into the other channel.  If I turned phantom power off the hum went away.

I haven't had the problem with balanaced line either and in the end we just went for a second mic on the guitar which avoided the hum.

Steve.