Join Date: Aug 1999
Location: Kemptville, Ontario, Canada
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Put a voltmeter across the speaker terminals. Get an average reading on the AC Voltage scale. Then calculate power as:
Power = ( Voltage * Voltage ) / SpeakerResistance
Voltage would be in Volts. SpeakerResistance would be in Ohm (ie. 8 Ohms).
For example, if you read 4 volts, then 4*4/8 is 2 watts.