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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.
sohandso08f8

Showing 2 responses by gmkowal5c1a

gmkowal5c1a
91 posts
 
Correction on my last post: 32=(2*2)*8.
gmkowal5c1a
91 posts
 
Procure the following: 8 ohm non-inductive 250 watt resistor AC clip on ammeter low frequency function generator Connect 1 end of your resistor to the + output on your amp. Connect the other end of the resistor to the - output on your amp. Place the resistor on something non-combustible as it will get very hot. Clip the clip-on ammeter around one of the wires leading to the resistor. Connect the function generator to you amplifier's input. Set the generator to Sine Wave, 100Hz, and amplitude to minimum. Turn on your amp then turn on the function generator. Adjust the function generators amplitude until you see the current on the ammeter rises no more. This happens at clipping. Note the current and decrease the amplitude. You can shut everything down now. Do not touch the resistor as it will be very hot. Calculate the power by using the following: Power= (measured current squared)* 8 ie. if you measured 2 amps then 32= (4 * 4) * 8
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