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In layman terms, a volume control reduces the voltage going to the transistors in the amplifier stage, therefore reducing the output down from maximum rated power. In theory, the 0dB setting is the maximum 'clean' power you can attain. Of course, music is not a test tone so the dynamic range of it, the efficiency of your speaker, the air volume you are trying to fill etc etc will all impact this.
Ian
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'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
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