The wattage rating of an amplifier refers to the amount of electrical power it can deliver to a speaker. The higher the wattage rating, the more power the amplifier can deliver and the louder the speaker will be able to play.
In this case, the 600-watt amplifier can deliver twice as much power to the subwoofer as the 300-watt amplifier. This means that the subwoofer will be able to produce twice as much sound pressure, which will result in a louder sound.
It's important to note that the wattage rating of an amplifier is not the only factor that determines how loud a speaker will be. The sensitivity of the speaker and the size of the room in which it is placed will also play a role. However, all other things being equal, a speaker paired with a higher-wattage amplifier will be louder than a speaker paired with a lower-wattage amplifier.
