Outdoor speakers also have a variety of power, the largest remote speakers, line array speakers, etc., if the use of larger caliber units, a single speaker rated power are generally more than kilowatts, this type of speaker is more suitable for outdoor performance sound reinforcement.
There is also the outdoor broadcasting speakers, the power is tens of watts mostly, only as a general language sound reinforcement or background music sound reinforcement. Large performances with a power of up to 2000 watts, small such as the big mom dancing in the square battery trolley speakers also have two or three hundred watts. Speakers withstand power of more than 1000 watts is high power.
In fact, the most critical or to see what occasions with the speaker, how many people. If you are buying professional stage speakers, five hundred people below, two 12-inch combined five or six hundred watts can be. Five hundred people to two thousand people, two single fifteen inch high together with a kilowatt enough. More than two thousand people on the double fifteen, the standard two together are generally about one thousand six hundred watts, two kilowatts of high, the top can reach three kilowatts.
Outdoor active speakers then Road, one or two hundred people with double ten inch or double twelve inch can be, the power are between two hundred and five hundred watts. More than two hundred people with double fifteen inches, a pair of double ten genus five inches of power are in a kilowatt.
Note: active speakers are less powerful.
Expanded Information
The factors most directly implicated in the power issue are the speakers, including their efficiency and the distance from them to the listener. However, the sound pressure is inversely proportional to the square of the distance from the source, so if the listening distance is estimated at 2 meters, the same speakers will only have 80dB of sound pressure left when 1W of power is fed into them (the dB algorithm is doubled every 3dB, and the distance is doubled by 1/4 of the sound pressure, which is -6dB).
Lastly, we do not have to worry about amplifier power is too big to have burned out the speakers, the current amplifier are equipped with protection circuitry, in unusual output conditions such as power or frequency is too high, short circuit at the output of the amplifier, etc., the amplifier will cut off the output to protect the speakers and amplifier circuitry.
Speaker power and sound quality is not necessarily related to the good and bad, its power size only determines the size of the sound, therefore, for the limited room area, the speaker's power is suitable for good, for the average home user of about 15 square meters of the room, the speaker's actual output power in the 15W × 2 or 20W × 2 enough.
References
Baidu Encyclopedia - Speaker Power Rating
People's Daily Online - Amplifier power to be greater than the speaker power