Alex,
to prevent damage to the speakers you should check not only the peak power and the continuous power a loudspeaker can tolerate but also its frequency response. If your amplifier can deliver 275 W from 20 to 20KHz, then your speaker should be able to cope with that, especially at the lower end of the curve; a speaker that handles that power only from - say- 80 Hz up is useless (I speak out of a painful personal experience).