Just got mine! I'm guessing I should not turn up volume full on the actual device but you the DAC's volume control as I get a hum/crackle sound when i do something small like my mouse around. Is this normal?
JDevsI use a Topping D10 USB to optical/coaxial dac which then inputs to my Modi 3 multibit dac to get rid of the interference from the USB. A ferrite bead helps a great deal as well if your going USB directly to RCA only.