Arizona Drivers Permit Practice Exam Guide

When calculating the required amplifier size for a 70V PA system, how is the minimum amplifier wattage determined?

By adding the maximum wattage handling of all speakers By summing the selected transformer tap wattage of all connected speakers and adding a 20% headroom margin By measuring the total resistance of the wire By multiplying the number of speakers by 70 volts

Correct Answer:

By summing the selected transformer tap wattage of all connected speakers and adding a 20% headroom margin

Explanation:

You add up the wattage of the specific tap settings on each speaker transformer, then typically add a 20% safety margin (headroom) to select the amplifier power.

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