These power measurements are 1 channel then 1 of the 5 channels for music ? Amazing how much power the powered subwoofer saves the channel amps

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Right. These measurements are for one channel with all the rest 5.1 (or 7.1) ON including the sub. So they all kick in. The mains are relieved from the bass duties and the 500W of EP500 are doing all the hard work.