Wrong end of the stick a touch there, I'll use the old car analogy (car analogies always seem to work with Hi-Fi for some reason
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I presume your car (if you drive) will go faster than 70mph? But why? Anything more is illegal and worthless in this country. Well the simple fact is that if you spend much time at that 70mph limit in a car which has a 70mph top speed the chances are that you'd be at 6k+ revs, the engine would overheat and you'd have no power to overtake if the need arose, aside from which the strain and noise would make the trip very uncomfortable.
Now, do that same trip in a far more powerful car with 140mph top speed, you'll probably be sitting at around 2k revs at 70mph, relaxed and well within your limits, the car will be more reliable and controllable, if you have to overtake you will be able to do so with ease.
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Relate that exactly back to amplifier power and you will get the idea, it's not about volume. A powerful amp will have more control of your speakers, less distortion, more detail evident (especially in the bass where more power is required to control the larger driver) and headroom for peaks in music - even at your favoured modest listening levels.
That's the basic's really, generally more power = better amp, all things considered. A perfect amp would have no character of its own, this is where the grey areas arise as there is no "perfect" amp so character comes into it!
Even with character removed from the equation the bare figures don't tell the full story - power, be it horsepower or watts (RMS) relates to just one measurement - in the real world there are other factors, consider torque as an equivalent to current supply in an amp and this is in many cases just as, if not more important than the wattage figure. (Naim amps are a good example of low power but good current delivery equalling a good amp capable of driving fairly difficult loads).
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Just my two penneth worth!
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