Can the speaker wattage be less than the amplifier/receiver wattage?
In short, yes. However, if the speaker is rated lower than the output of the amplifier or receiver you run the risk of overdriving the loudspeaker. Overdriving a loudspeaker can damage it. Normally you want to choose a loudspeaker with the same or higher max rated power (Watts) than the amplifier you will drive them with. Most loudspeakers have two power ratings: maximum continuous power and peak power. The continuous power tells you how much power the loudspeaker can handle all the time and peak tells you how much power the loudspeaker can handle for short periods.
