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You cannot always go by what the back of the AVR says. It may say 300VA or 280W but it does not say under what condition. It could be for typical (whatever that means)listening level, 2 channel at rated output, or whatever.
It seems that some manufacturers tend to inflate their output but deflate their input power to show that they are energy efficient. HK is one exception, they tell you their power requirement at both idling, and with all channels at maximum output.
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