How much power is the most suitable for home audio?
In general, the living room of a family is used as a listening environment. If high-efficiency speakers are used, the "continuous output power" of each channel (8 ohm load) of the power amplifier is about 20~25W, which is basically sufficient. If you want a more "forceful" bass effect and choose an air-cushion speaker, then you have to match the power amplifier with a larger output power according to the required matching power. In the 1970s, Japan's Sansui and Pioneer were relatively practical brands. If you are just starting out in the audio field, it is recommended that you invest more of your budget in speakers that are of better quality and suit your "ears". In addition to the difference in appearance and function between a 500 yuan and a 1,500 yuan amplifier, (most importantly) the difference in tone is not so obvious. But the difference between the two pairs of speakers priced at 1:3 is very obvious. Also, there is no need to look for famous brands when buying speakers, as famous brands are not necessarily good. Remember! If the initial investment budget is not too high, in addition to focusing on the two main channels of front left and front right, speakers will be enough for the other channels.
The power of the speaker unit of the speaker generally depends on the power of the woofer unit. For example, if the power of your woofer unit is 60-120W, then the power of this speaker can be regarded as 60-120W.
What is the general attack power of outdoor speakers?
There are many types of outdoor speakers. The most powerful ones include remote speakers, line array speakers, etc. If a larger diameter unit is used, a single The rated power of speakers generally exceeds kilowatts. This type of speakers is more suitable for outdoor performance sound reinforcement.
There are also speakers for outdoor broadcasting, most of which have tens of watts of power and are only used for general speech amplification or background music amplification. Large ones for performances can withstand up to 2,000 watts, and small battery-operated trolley speakers such as those used by aunties for square dancing can also have two to three hundred watts. Speakers that can withstand more than 1,000 watts are considered high power.
In fact, the most important thing is to see where the speaker is used and how many people use it. If you want to buy professional stage speakers, for less than 500 people, two 12-inch speakers add up to 500-600 watts. For 500 to 2,000 people, two single 15-inch-high ones add up to one thousand watts. If there are more than 2,000 people, it will be double fifteen. The standard configuration of the two units generally adds up to about 1,600 watts, the high-end configuration is 2,000 watts, and the top configuration can reach 3,000 watts.
As for outdoor active speakers, a double ten-inch or double twelve-inch speaker can be used for about one or two hundred people, and the power is between 200 watts and 500 watts. For more than 200 people, a pair of double 15-inchers is used, and the power of a pair of double 10-inchers is one thousand watts.
Note: The power of active speakers is relatively small.
Extended information
The factor most directly involved in power issues is the speaker, including the efficiency of the speaker and the distance from the speaker to the listener. However, the sound pressure is inversely proportional to the square of the distance from the sound source, so if the listening distance is estimated as 2 meters, the same speaker will only have 80dB sound pressure when inputting 1W power (the dB algorithm is doubled every 3dB, and 2 times the distance 1 /4 sound pressure is -6dB).
Finally, you don’t have to worry about burning out the speakers if the power amplifier is too powerful. At present, power amplifiers are equipped with protection circuits. In the case of unusual output conditions, such as excessive power or frequency, short circuit at the output end of the power amplifier, etc. , the power amplifier will cut off the output by itself to protect the speaker and power amplifier circuit.
The power of the speaker is not necessarily related to the quality of the sound. Its power only determines the size of the sound. Therefore, for a limited room area, the power of the speaker is suitable. For ordinary For a home user's room of about 15 square meters, the actual output power of the speaker is 15W×2 or 20W×2, which is sufficient.
Reference materials
Baidu Encyclopedia - Speaker power rating
People's Daily Online - Amplifier power should be greater than speaker power