I only use non-master volume amps and i generally have them at killer volume level around 8, yet i control them with a very clean overdrive pedal volume knob and with the guitar volume knob. its perfect. Angus young near cranks the amps all the time and other than his schaffer pedal he has the volume on the guitar at around 3 only, and when he needs more, he simply turns the guitar volume knob and that single knob controls the marshall monster. There is far too many people who have turned into weak fluffy generation scared of volume that they go through many amps and never get to hear any of them properly, this can go on for decades. Marshall dont bite, they are like a well trained dog, YOU ARE THE MASTER VOLUME. I can stand right in front 2 inches from my super 100 non master volume full stack, right in front of it, and its so glorious, the tone, oh my the tone, and thats controlling it with the guitars volume knob and a very open and clean boost on the floor for extra volume control. Done deal. Its quiet ish, sustain more than any other amp on earth, and that amazing Marshall goodness that is NOT SQUASHED.