Arizona Drivers Permit Practice Exam Guide

In a 70-volt distributed audio (PA) system, what is the primary purpose of the transformer located at each speaker?

To convert AC audio signals to DC To step down the high voltage audio signal to a lower voltage usable by the speaker coil To add bass to the audio signal To filter out background noise

Correct Answer:

To step down the high voltage audio signal to a lower voltage usable by the speaker coil

Explanation:

The step-down transformer at each speaker converts the 70V high-voltage/low-current signal back down to the 8-ohm (or similar) level the speaker voice coil requires.

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