I completely agree with Rockvirgo. Digital components can be realy noisy. The biggest source is power line.
1. Try to use a good quality power cord
2. Try to connect your digital source onto the different power line or to the power conditioner/power plant.
The same tweaks I would suggest to do with your preamplifier.
1. Try to use a good quality power cord
2. Try to connect your digital source onto the different power line or to the power conditioner/power plant.
The same tweaks I would suggest to do with your preamplifier.