In an ideal situation this is true. For any

practical system it's not. As load goes up,

impedance goes down and amps go up. Your

power is

fed by

wire.

Wire has a resistance (and an

inductance and

capacitance we shall choose to neglect for now). So you get

voltage drop across your wiring, the magnitude of which is entirely load dependent.

Resistance is proportional to temperature, length and material constant and inversely proportional to cross sectional area. This is why an undersized cable is a fire hazard - that

voltage drop we talked about earlier is energy being dissipated as heat. Too much heat in close quarters and you get a fire...

If the volts are low, get a

sparky in. It's entirely possible that the distribution

transformer needs to be retapped. (More customers have been added on and so the available

voltage is now lower...)

Digital or analogue

console? Switchmode or linear supply?