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Is this logic?

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#1
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#2
Max input on the speakers is 20 W, max output form the amp is 10 W.

You do not want a speaker that cant take the power form the amp, as it could damage the speakers if the amp is set to max output.

amp Watt < speaker watt is logical

Also, you do not "lose" half the power, the speakers cant take more than 20 W, but should be fine 10 W (provided you don not distort the signal)
 
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#3
So amp Watt = speaker watt wouldn't be better?
 
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#4
Simple reason why this makes perfect sense, sustained wattage and momentary wattage aren't currently being displayed in this question. The peak wattage and sustained wattage are two very different quantities. Peak wattage may be between 50 and 100 percent (depending upon settings) higher than the sustained wattage. Thus, a speaker has to either run the risk of blowing out, or be rated at a higher wattage than the amplifier.
 
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#5
Thanks for answers. I thinked that both wattages are sustained :)