Dave74
100+ Head-Fier
- Joined
- Dec 18, 2013
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When I originally checked mine with no input cables attached, I'm sure it was completely quiet so I had put the noise issue down to my Emotiva DAC.
I've just checked it again however and I'm getting a different result. With no input cables attached and fairly sensitive headphones (TP51s) connected to the SE output, there's a constant low level 'drone' almost like an aircraft engine noise.
This is audible at all volume levels from zero upwards. At high volume levels (past 2 o'clock in x3, almost full volume in x1) there's a louder interference that is clearly 50Hz 'transformer' noise.
The noise is the same at both settings of the input switch.
The balanced output remains quiet in all circumstances.
It would be helpful if Cavalli could shed some light on what might be causing the interference in SE output mode.
The hum I get from the SE isn't there when I first turn the amp on. It builds up after about 30-45 minutes of use. I have tried turning it off and then back on and the hum increases within a few seconds while the amp is still warm. This is probably why I didn't notice it before break-in, as I had just tried my JVC IEM's for 1 song.
My balanced output is quiet at well.