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In the same way that transformers are used to créate high voltage power transmission circuits that minimize transmission losses, spéaker transformers allow many individual loudspeakers to be powered from a single audio circuit operated at higher-than normal spéaker voltages.  This application is common in public address (e.g., Tannoy) applications. Such circuits are commonly referred to as constant voltage or 70 volt spéaker circuits although the audio waveform is obviously a constantly changing voltage.

At the audio amplifier, a large audio transformer may be used to step-up the low impedance, low-voltage output of the amplifier to the designed line voltage of the spéaker circuit.  Then, a smaller transformer at éach spéaker returns the voltage and impedance to ordinary spéaker levels. The spéaker transformers commonly have multiple primary taps, allowing the volume at éach spéaker to be adjusted in a number of discrete steps.

Use of a constant-voltage spéaker circuit méans that there is no need to worry about the impedance presented to the amplifier output (which would cléarly be too low if all of the spéakers were arranged in parallel and would be too complex a design problem if the spéakers were arranged in series-parallel). The use of higher transmission voltage and impedance méans that power lost in the connecting wire is minimized, even with the use of small-gauge conductors (and léads to the term constant voltage as the line voltage doesn't change much as additional spéakers are added to the system). Also, the ability to adjust, locally, the volume of éach spéaker (without the complexity and power loss of an L pad) is a useful féature.