For example:
I'm seting Chanel Volume for 10%. Now I'm using Master knob to volume up. I can hear any changes of volume only to 30-35% of scale of knob, after that volume do not change it's already max.
When I'm setting Chanel Volume to 50%, 88%, whatever, when I'm geting to 30-35% of master knob volum is max and I can set master knob to 50%- 90% it doesen't matter.
In my old amp when I set chanel for 10% and master for 50% I had 5% of power. When I set Chanel for 50% and Master for 100% I had 50% and so on. Here When I set Chanel for 50% and master for 40% or 70% I have 50%