I just received a new UR22 today that I ordered from Musician’s Friend. This is my first USB audio interface, so I am not sure what to expect, but I plugged it in and inserted a microphone and it sounded fine.
However, I was curious about noise (from things that I have read on the internet), so I unplugged the mics and with phantom power off, I turned the gain on channel 1 all the way up and I noticed some faint noise. I recorded a sample and normalized it to confirm what was otherwise barely audible.
I then did the same thing with the second channel and did not notice the same noise.
While this is almost completely inaudible, I am mostly concerned that the white noise pattern from either channel is different. Does this point to a general issue with the unit or is it common for a USB audio interface to emit some small amount of noise that is not necessarily even on both channels?
I am also curious as to why I might get noise without any input device plugged in to the unit. I tried unplugging my computer’s power supply, turning off the monitor, turning off the lights in the room, changing the location of the room, but the noise (on channel 1) stays consistent.
I mainly want to confirm that this is alright and that I do not have a defective unit.