I've been frequenting this site and other that are similar for awhile now. For the most part I have a basic understanding of the measurements. But one of thing I rely on Amir for is interpreting the power of a device in milliwatts or watts from a graph like this. Can anyone help me interpret the power personally? How many milliwatts would this device push? And why is there two graphs for one device? I get the THD +N ratio and ohm load, but I don't understand measured level (W)
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Favor: Can you help me interpret power measurements?
- Thread starter ShiZo
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As you can see the power is on the X axis, and distortion on the Y axis. Industry standard is to rate the device as X watts when the power curve crosses 1% THD+N.
THD+N is the total harmonics and all noises considered. It is a ratio: sinal level divided by distortion and noise.
The beginning of the curve is descending because noise floor is constant and low signal, gives a high number. As the signal increases and the noise floor is kept low, the ratio is lower.
Until a certain point when the device starts adding distortion, and jumps when it starts clipping. No more power there, just garbage out.
THD+N is the total harmonics and all noises considered. It is a ratio: sinal level divided by distortion and noise.
The beginning of the curve is descending because noise floor is constant and low signal, gives a high number. As the signal increases and the noise floor is kept low, the ratio is lower.
Until a certain point when the device starts adding distortion, and jumps when it starts clipping. No more power there, just garbage out.
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