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Old 11th August 2010, 11:02 PM   #1
vizion is offline vizion  United States
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Default Watt Meter

There was an old thread about power meters. I found this little toy that can do the job nicely.

Atlantic Quality Design, Inc., The PM-150 Audio Power Meter
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Old 12th August 2010, 05:40 PM   #2
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Usually I only need to go up to 1 watt.

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Old 12th August 2010, 10:33 PM   #3
vizion is offline vizion  United States
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Curious, since First Watt specializes on low powered but great amps. Who makes the loudest, largest Class A amps ever ? Has anyone ever made a 1 kilowatt Class A ? Prob'ly not.
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Old 12th August 2010, 10:47 PM   #4
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Quote:
Originally Posted by vizion View Post
Has anyone ever made a 1 kilowatt Class A ? Prob'ly not.
My 1024W RMS CLASS A+ amplifier.

Too bad we will never see the end of that story.
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Old 14th August 2010, 04:56 AM   #5
vizion is offline vizion  United States
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Suffering Suckatash !
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Old 15th September 2010, 05:24 PM   #6
kzim229 is offline kzim229  United States
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I use this gizmo a lot. Sometimes you want to know the current draw.
Amazon.com: P3 International P4400 Kill A Watt Electricity Usage Monitor: Camera & Photo
definitely worth the $20.
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Old 15th September 2010, 05:45 PM   #7
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The device isn't measuring power if the speaker in and out jacks have virtually zero insertion loss. It appears that the device is measuring the voltage across the speakers and does not take in account the impedance of the loudspeaker.
For accurate measurement of output power, you really need to sample the current going to the loudspeaker using a low value resistor or a current sampling transformer.
Even so, you'll need to be able to calibrate the meter across the audio spectrum based upon the actual impedance of your speaker system at various frequencies.

That is why most amplifier power meters are pretty much useless. They are simply not accurate.
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Old 17th September 2010, 04:27 AM   #8
vizion is offline vizion  United States
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I have a kill-a-watt. I used it to measure my amp. Constant power draw is 400w.
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