As Tom indicated, the determining factor is how loud you play a speaker, not the maximum power capacity of the amplifier. Most of the time with a speaker of average sensitivity, such as the M2, the speaker will use about 1 watt for a comfortably loud level. The amplifier can be capable of 200(or 2000)watts, but there's no danger of damage to the speakers(or your hearing)if they're not played at dangerously high levels. Even on brief peaks it's unlikely that more than about 100 watts would be used.

Enjoy the music, not the equipment.