In professional audio in the regular case of 10-inch is 150W-300W, 12-inch is 200-400 watts, 15-inch is 300-600W, the civilian speaker power should be smaller.
The size of the power does not only depend on the size of the speaker, depending on the size and material of the magnet and voice coil. The size of the sound does not only depend on the power, but also on its sensitivity and maximum sound pressure level, which can also be calculated from the power and sensitivity.
Expanded information
First of all, the sound quality of the speaker will have a relationship with the speaker unit used in the speaker. A pair of children with carrying power, low distortion, wide frequency response, good transient response, high sensitivity of the wide-range speaker unit speakers, the sound is definitely better than a pair of children with a lot of speaker units, but the speaker unit quality is very general speakers.
On the Internet some multi-frequency bookshelf box/floor box, they often have a high-end atmospheric appearance, but the speaker unit is often used in domestic cottage speaker unit, listening quality is very poor.
Speaker power is generally how much who knows
Speaker speaker unit power generally look at the power of the bass unit, for example, your bass unit power is 60-120W, then the power of this speaker can be regarded as 60-120W.
Outdoor speakers are also many kinds of the largest power remote speakers, line array speakers, etc., if it is using a Larger caliber unit, a single speaker rated power are generally over kilowatts, these speakers are more suitable for outdoor performance sound reinforcement.
There is also the outdoor broadcasting speakers, 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 to two thousand people, two single fifteen-inch high-quality up to one 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 genera 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 the speaker to the listener. But 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 in the input 1W power will only be left with 80dB of sound pressure (dB algorithm is doubled every 3dB, 2 times the distance of 1/4 sound pressure 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.
The power of the speaker and the 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 area of the room, the speaker's power is suitable for the 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 News - amplifier power should be greater than the speaker power
Outdoor audio is generally used how many watts?
Depends on what occasion you use it, and how many people use it. If you are buying professional stage speakers, five hundred people below, two twelve inch add up to five or six hundred watts enough. 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 generally add up to one thousand six hundred watts or so, high with two kilowatts, the top can reach three kilowatts. Outdoor active speakers, one or two hundred people with double ten inches or double twelve inches about the same, the general power are between two hundred watts and five hundred watts. More than two hundred people with double fifteen inches, generally a pair of double fifteen inches of power in a kilowatt or so. (Note; the general power of active speakers are relatively small)
Outdoor speakers are also 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 performances sound reinforcement use. There is the outdoor broadcasting speakers, power is tens of watts mostly, only as a general language sound reinforcement or background music reinforcement.
How much power is the most suitable for home audio?
General family with the living room as a listening environment, if the use of high-efficiency speakers, amplifiers, each channel (8-ohm load) of the "continuous output power" of about 20 ~ 25W is basically enough. If you want to compare the "force" of the bass effect and the choice of air-cushion speakers, then you have to match the power required by its matching power supporting a larger output power amplifier. In the 70s, Japan's Sansui (Sansui) and Pioneer (Pioneer) are more practical brand. If you are just starting to play audio, it is recommended that you put more of your budget into better quality speakers that fit your "ear". The difference between a $500 amplifier and a $1500 amplifier is not so obvious, except for the form and function, and (most importantly) the sound. But two pairs of speakers with 1:3 quotation, the difference is very obvious. Also, there is no need to buy a stereo to catch the brand name, the brand name is not necessarily good. Remember! If the investment budget is not too high at the beginning, in addition to focusing on the front left and front right two main channels, the other channels, there are speakers will be fine.
General audio power is how much
Generally a little better is about 4,000 to 5,000 amplifiers, the main channel output is generally in the 120W to 150W.
Professional audio amplifier output power to scare you to death, for fear that your speakers will be exploded, of course, this is just to describe the professional second-hand amplifiers, generally a brand 300 to 500, Imported 1000 to 4000, miscellaneous brand new are only 500, our side of the sale of second-hand goods, the United States Lescom: 1600, JBL amplifier: 700. do not know what grade you want? I recommend the best high-power home amplifier in the 150W, Hewlett-Packard's good, a little more than 4000. You also need to match the corresponding speakers, you can achieve the best results. If the speakers and amplifiers have to buy, for the first acquaintance with the stage people, it is recommended to buy a set. Fever is generally their own match.