On Wed, Apr 01, 2015 at 10:16:59AM -0500, Chris Caudle wrote: > On Wed, April 1, 2015 2:03 am, Patrick Shirkey wrote: > > So you are saying that Behringer manufactured and released > > an entire range without testing *any* of them before they > > went out the door for ground loop issues at the board/design level? > > Something much more limited and specific: I am saying that the > description provided by Fons of the behavior of that specific model of low > cost mixer is consistent with a "pin 1 problem" design flaw, although that > is a bit of a misnomer with a USB connector. "Pin 1 problem" is much > easier to say than "reference conductor common mode impedance noise > coupling" though. Possibly only affecting the headphone output, Fons > never mentioned whether he also checked the main or monitor outputs. The strange thing is that this high level hum appeared on the HP output, with the main stereo out selected as the source and the main and all other faders completely down. So this hum did not originate at any input - it was there on an internal signal even with all inputs muted. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
