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Pioneer Vsx-21txh power consumption 400 watts with 110wpc

Denon 2310ci power consumption 708 watts with 105wpc

Onkyo TX-SR707 power consumption 720 watts with 100wpc

now my question is it seems as power consumption goes up watts per channel go down, pioneer seems to get more wpc with less power consumption are the pioneer numbers possible or are the other 2 just inefficient. any thoughts on this.