I have a problem with the Gungnir DAC. Let's see if anyone can input more thoughts into this ..
PC (Optical Out) / Notebook (USB) -> Gungnir -> Meier Corda Classic -> HD650 / ES5
When I left the Gungnir open for about 10 ~ 30 mins, it will have a slight hum (like a ground loop noise).
It will grow louder and louder and reach a point I could not tolerate (about 1 hour later).
Then I switch the unit off for a night and the noise will go away.
However when I turn it on again it will repeat the same loop.
I have sent the unit back to Jason and they have checked there is no problem.
What I have swapped so far and they do not help ..
2. power outlet
3. amp (cheap China amp + some portable amp from RSA / Pico)
4. source file (no matter 16/44.1 / 16/48 / 24/96 )
5. DAC (again cheap China DAC, no problem with these setup)
Any thoughts / input are appreciated. Thanks all !!