On Tue, 2013-08-13 at 08:08 -0700, Rusty Perez wrote: > Also, when I get really close to my ART tube pac unit, I hear a quiet > humming from the box itself. This likely is the normal sound of a mains transformer, especially when the plates of the mains transformer aren't sealed anymore, IOW when there's air between them, the transformer becomes loud. This hum shouldn't be audible by the audio signal. One of the loudest transformers I know is used for my Matrix-1000 and it's one of the devices that IMO do cause completely no audible noise and/or hum. A loud transformer shouldn't have impact to the audio signal. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user