Author Topic: audio amplifier output rms wattage question...  (Read 1587 times)

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Offline kasumyku

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audio amplifier output rms wattage question...
« on: July 17, 2013, 06:26:13 am »
Hello everyone,

When testing for rms output wattage of an audio amplifier, do all channels must have dummy loads connected in order get accurate readings, or just only one?

Thanks!!!
 

Offline Zero999

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Re: audio amplifier output rms wattage question...
« Reply #1 on: July 17, 2013, 06:39:50 am »
All loads should be connected, to accurately measure the output power as the power supply voltage can drop under load.
 

Offline kasumyku

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Re: audio amplifier output rms wattage question...
« Reply #2 on: July 17, 2013, 07:19:01 am »
thanks hero999 !!!
 

Offline Odysseus

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Re: audio amplifier output rms wattage question...
« Reply #3 on: July 17, 2013, 11:56:25 am »
To be technically correct, you will be measuring average power, which is the product of the RMS (or heating value) of the voltage and current. The phrase "RMS power" or "RMS wattage" is a bit redundant.

I remember this because I used the very same phrase when talking to a co-worker right before receiving a brief lecture from said co-worker.  :D
« Last Edit: July 17, 2013, 12:01:45 pm by Odysseus »
 

Offline vk6zgo

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Re: audio amplifier output rms wattage question...
« Reply #4 on: July 17, 2013, 04:36:56 pm »
To be technically correct, you will be measuring average power, which is the product of the RMS (or heating value) of the voltage and current. The phrase "RMS power" or "RMS wattage" is a bit redundant.

I remember this because I used the very same phrase when talking to a co-worker right before receiving a brief lecture from said co-worker.  :D

And rightly so! Even if the Root Mean Square value of a power waveform had any practical use,it still would not be the product of the RMS values of voltage & current.
 


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