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Discussion Starter · #1 ·
I found this article which talks about the math needed to calculate amp power output.


It also explains how over simplified the math is, and why better calculations are not feasible.

Quote:
You will note the sweeping assumptions made here. The square-root-of-two factor assumes the waveform is sinusoidal, which it is not.

The load is assumed to be a pure resistance, which it is not.

This may lead you to suppose that these calculations are pretty pointless- but then consider the alternative. Every piece of music has its own "waveform", and every speaker its own complicated impedance curve; each combination would give different results. In fact the sinewave case is more demanding than music in terms of heating and output device stress; in contrast a resistive load is always kinder to the output transistors than a reactive load.
http://www.signaltransfer.freeuk.com/powerout.htm
 

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Your link is to information written by Doug Self. Doug also wrote a good complete book on amplifier design.
 

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Discussion Starter · #4 ·
I have his book at the moment via interlibrary loan. ILL is awesome
 
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