It has everything to do with AC power. The voltage does not matter.
I cannot speak for your country, but in the USA the two poles on the AC electric plug will be either 120V or Zero. Balanced power as I stated before is 60 & 60 180 degrees out of phase; or to put it another way +60 and -60 volts, the difference between the poles is the same 120V which feeds your gear. The noise is canceled out because the 2 poles are exactly 180 degrees out of phase with each other.
So the power in your wall (if it is unbalanced) is 240V and Zero between the 2 poles. Balanced would in essence be +120 and -120 between the 2 poles. Still 240 Volts.
A step-up or step-down balanced devise is just regenerating balanced power at whatever the output voltage is.
I cannot speak for your country, but in the USA the two poles on the AC electric plug will be either 120V or Zero. Balanced power as I stated before is 60 & 60 180 degrees out of phase; or to put it another way +60 and -60 volts, the difference between the poles is the same 120V which feeds your gear. The noise is canceled out because the 2 poles are exactly 180 degrees out of phase with each other.
So the power in your wall (if it is unbalanced) is 240V and Zero between the 2 poles. Balanced would in essence be +120 and -120 between the 2 poles. Still 240 Volts.
A step-up or step-down balanced devise is just regenerating balanced power at whatever the output voltage is.