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Input-power listing vs Output-power rating
Just out of curiosity, I've noticed the power-input label on the XLS-1002 reads 175-watts while it's rated output is 700-watts into 4-ohms (both sides driven).
Now, given that efficiency even in class D rarely exceeds 90%, how do we get more out than what goes in?
The same is true for the XLi-800, the XLS-1002's class AB predecessor. It reads 430-watts input, but is rated for 600-watts output into 4-ohms (both sides driven).
Is this a function of a Harman-proprietary rating method? Is it not RMS?
Don't take this wrong, it's an honest question and I have both amps (just bought another one last month), but I'd like to know why there's an apparent discrepancy between the input power listing and the output power rating.
Comments
If I am reading this right, you're comparing the 120VAC line voltage to the amplified speaker outputs (which are DC)? They're not directly comparable.