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is rated at 30 watts @ 8 ohms. If I connect it to a PA amplifier rated at 30 watts @ 8 ohms, how much voltage would be measured on the speaker cable?

April 26, 2017amplifier Connect measured ohms PA rated voltage watts

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is rated at 30 watts @ 8 ohms. If I connect it to a PA amplifier rated at 30 watts @ 8 ohms, how much voltage would be measured on the speaker cable?

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First make sure you are connecting to a commercial sound amplifier having an 8 ohm transformer isolated output tap (such as the Peavey UMA352 available from Lubell Labs). Next make sure you are looking at the amplifier’s speaker rms output rating (30 watts rms @ 8 ohm) found in the specification section of the manual, and not the amplifier’s power consumption rating by the power cord. Using a calculator, take the square root of the wattage (30 watts rms) times the impedance (8 ohms) which equals a voltage of 15.492 volts rms. This is well under the 30 volt rms international legal limit.