An important question - does the genny put out a TRUE sine wave or a MODIFIED sine wave. A genny with a true sine wave is the only choice for audio. do your research before buynig. Or renting
While I agree, I'd like to know why.
All of the audio devices that I know about use a either a transformer and linear power supply, or a switch mode power supply. In each case the AC lines voltage is converted to a DC rail, or supply voltage suitable for the application.
A linear power supply passes the 60hz AC wave through an iron and copper x-former. This usually steps the voltage down, then the lower voltage is converted to pulsed DC and sent into a capacitor bank that acts essentially as a massive low pass filter. The ripple left after this can be smoothed further depending on need. This DC (essentially, the ripple should be very low in frequency at this point) voltage is then changed into various voltages for the circuits.
A switch mode power supply converts the incoming AC into DC, then into a very high frequency wave, that is passed through a (much smaller) iron and copper x-former, converted to pulsed DC, then passed into a capacitor bank, another low pass filter, then converted to the required DC supplies necessary for the device.
In both of these cases I cannot see how a stepped AC voltage is any different than a pure sine wave. While the stepped voltage will have more noise, that should be filtered, the duty cycle at each voltage step should be similar enough (to a sine wave) to only loose a small amount of efficiency in the x-former.
Admittedly I know way more about linear supplies, but I just cant figure why audio devices would see a difference if the AC is a step function or a continuous one.