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This method of getting audio from amplifiers to speakers is similar in principle to power transmission methods used to distribute electrical power. The power company puts power on a line that carries it a long distance with thousands of Volts. The voltage is stepped down to hundreds of Volts at the building where the power is used. Because lower currents are required at high voltage, the resistance of the line does not cause a loss of power because of heat, and smaller diameter wires can be used.
Similarly, we can apply a high voltage audio signal to a speaker line as long as there is a transformer at the speaker end to reduce the voltage to appropriate values for the drivers. Usually this system is used to distribute audio to a large venue
to many speakers. I some cases a constant current system is used to save money on speaker wire.
== Loudspeaker connection ==