Hmm noticed something weird, when I plug my Sennheiser HD 598s in with the stock cable I get some 'alien' noises and oscillation in the right ear, but if I use the cable I bought from ebay on the same headphones it doesn't make the noise. Very strange.
Also I can stop the noises by using a 3.5mm extension cable connected to the stock cable.
Wonder if it has anything to do with the 3 ring connector on the 2.5mm end of the HD 598 stock cable because it's only in one ear.
Yeah, with my HD 380's I have only the radio frequency interference in one ear.
I have also noticed that the two headphones that make noise with my Magni are ones I've owned for a couple years. The two silent phones are somewhat newer. It's as if the older the cable, the more worn and prone to the potentially inherent interference.
EDIT: I talked to Schiit and they think this behaviour is not normal and are gonna send me another one. I have my fingers crossed because this little amp really does sound great.
Edited by TwelveTrains - 12/10/13 at 11:33pm