If you need to raise the volume control to 2:00, there's a mismatch happening or the level controls in some area may be set too high and something is causing the output through the volume control section to decrease, IMO. If the controls for the inputs you have used are set for unity gain (0dB gain- the input level is equal to the output level), you should hear no noise. Unfortunately, the specs in the manual are far from complete. I looked at the specs for an integrated amp that I owned and it shows the input sensitivity, which is something that, if your specs showed it, would be helpful. The piece I owned had 150mV input sensitivity for the line inputs.
