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most of normal or casual listening is done within 2 watt to each speaker, because most of the time 2 watt will give you about 90 db's of output overall.

since speakers have an overall efficiency of probably 1~10% (meaning most of the electrical energy that you give it is turned into thermal energy/heat instead of mechanical energy/speaker movement), the more power you give it, the more heat will be generated. the more heat generated, the more distortion it will cause (simply put). Not to mention the more intensely the cone moves the less control the motor has over it..

IMO, i think more power/headroom will allow the speakers to stay clearer at higher volumes because the amps are less likely to clip...but in the end, less power will be more accurate and sound better because everything is less stressed..
 
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