This can be an amplifier problem as well. With many amplifiers, the distortion goes down as the output power is reduced- but only to a point. Below that point the distortion starts to go back up.
This occurs at different points with different amplifier designs and also with different power capabilities- the more power the amp can make, the higher the point where the distortion 'turns around' and goes back up.
For example with many amplifiers of about 120-150 watts this point might be at about 5-7 watts- just the point you are using at lower power levels.
With increased distortion comes less detail and a less musical presentation.
This occurs at different points with different amplifier designs and also with different power capabilities- the more power the amp can make, the higher the point where the distortion 'turns around' and goes back up.
For example with many amplifiers of about 120-150 watts this point might be at about 5-7 watts- just the point you are using at lower power levels.
With increased distortion comes less detail and a less musical presentation.