This is a very dirty but within 10 percent method. Get a 100 watt light bulb. Set your multi-meter to measure amps. Run your amps power up till you hear clipping on existing speakers. Hook up the bulb and meter in parallel with your amp output. Run the volume to the power level you first began hearing the distortion. Now read the amps off the meter and write it down. Now measure the resistance of the light bulb. The wattage is the amps reading squared times the resistance of the bulb. This is a safe test because if you run too much current the bulb will burn out opening the circuit with no harm done other then a bad bulb. You can use two bulbs is parallel also. The reviewers us a oil bath 4 or 8 ohm resister rated at 500 watts etc.
How to measure the power output?
I need to know the power output of my Roger RS-4 integrated amplifier before buying speakers. However, no indication marked on the amp. How can I measure its power roughly? I tried to measure the sould lever by Sound Level Meter by comparing with my Yamaha VX496 with 65W@8ohm power output. Both RS-4 and VX496 were set at 9 o'clock position. The reading for VX496 is more than RS-4. Does it means RS-4 get less than 65W@8ohm? The same result come out when I measure the level at 12 o'clock postion.
5 responses Add your response