No; the 1160 watts is for both channels operating at 1/3rd power. Those 90% efficiency numbers for class D amplifiers are at full power output. All amplifiers drop in efficiency at lower output percentages. For example, class AB amplifiers at 1/8th output(the output used for UL testing and typically for the power consumption number)are about 20% efficient. It wouldn't be unusual for a class D to be around 50% efficient at 1/3rd power.

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