ABSTRACT
An audio signal can be transmitted either as a voltage or as a current. The construction of the
universe is such that almost always the voltage mode is more convenient; consider for
a moment an output driving more than one input. Connecting a series of high-impedance
inputs to a low-impedance output is simply a matter of connecting them in parallel, and if the
ratio of the output and input impedances is high there will be negligible variations in level. To
drive multiple inputs with a current output it is necessary to have a series of floating current-
sensor circuits that can be connected in series. This can be done [1], as pretty much anything in
electronics can be done, but it requires a lot of hardware, and probably introduces performance
compromises. The voltage-mode connection is just a matter of wiring.
