...brings the total consumption into a 48W range, well below the rated output for a receiver but about 50% of its rating...

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Small correction. The receiver is rated 100W+100W, 2 channels driven, so it's at worst 25% . Plus there there is power in all other channels as well, may be 50Wpc, so over all the figure would be closer to 48W/300W = 16%. Still plenty of headroom