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Does this mean that it is drawing 300 watts even when I have it turned offNO, it is consuming no power when it is turned off. The exception would be if it has a remote that is waiting for a command to turn on but that circuit would draw very little.
, or only when it is turned on regardless of whether or not it's playing music???This is the correct answer. The power consumption does not go up when playing music. Class A amps consume the same amount of power whether they are playing music or not