Is the speaker power the bigger the better?

　　Multimedia active speakers are devices that restore electrical signals to sound. Therefore, multimedia speakers are an important part of a computer audio system. In a sense, it is more important than a sound card. A pair of speakers with good fidelity can interpret the true meaning of music authentically, while fake and inferior speakers not only emit cotton-like noise to torture your nerves, but also their crude production technology can bring safety risks. As a consumer, in the face of the dazzling variety of brands and models of active speakers on the market, how can we make the right choice and choose the desired product? The following is the professional audio manufacturer-Ding Tai Feng Audio Xiao Compile some discussions on this issue based on my own actual combat experience.

　　Among the many technical indicators of multimedia speakers, the size of the speaker power is particularly important. For most of my friends, they don't have much professional audio knowledge, and they always think that the louder the speaker, the better. In fact, such a statement is unscientific. Merchants have captured this psychology of consumers and made a fuss about the nominal power of the speakers. Some large and small speakers, regardless of their actual power, are labeled with the words 800 watts and 1000 watts on the signs. Even a pair of small plastic speakers can be labeled as 100 watts. The power of the speakers is really good. Is it that big? An ordinary pocket semiconductor radio uses only 0.5 watts of speaker power, which still allows people in a room to hear clearly; a high-quality earphone, its power is only a few hundred milliwatts , You can also hear wonderful music. It can be seen that listening to music does not actually require much power. Just imagine: the power of a household electric rice cooker does not exceed 1000 watts, but it can generate such high heat. If the actual power of your speaker is 1000 watts, then the heat generated by your speaker is enough to boil eggs !

　　In fact, this is just a trick played by speaker manufacturers. The power mentioned here is not the actual power of the speaker, but the peak power or music power (PMPO) of the speaker. According to international standards, there are two labeling methods for the power of speakers: rated power (RMS: root mean square sine wave) and instantaneous peak power (PMPO power). The former refers to driving an 8Ω loudspeaker within the rated range, which specifies the continuous analog signal of the waveform. After a certain interval and repeating a certain number of times, the loudspeaker does not cause any damage to the maximum electric power, which is the actual power consumption of the loudspeaker, such as Dingtaifeng GAEpro KS loudspeaker As an example, its nominal power is 1600W, which means that the power when KS can work stably for a long time is up to 1600W. If the speaker often works at a state higher than 1600W, it will be very easy to damage; the latter refers to what the speaker can do for a short time The maximum power to withstand, due to the large dynamic range of music, the power to withstand the speaker changes every moment. For example, when a movie reaches the climax, it often uses shocking music effects to render the atmosphere at that time. At this time, the speaker Basically, the emitted sound intensity will exceed the nominal power of the speaker, and there is a certain limit to the exceeded value. This limit is the maximum withstand power of the speaker. As early as 1974, the United States Federal Trade Commission stipulated the power calibration standard: drive an 8Ω speaker load with two channels, and the effective wattage measured when the harmonic distortion is less than 1% in the range of 20~20000Hz is The output power of the amplifier. The peak power is like a weightlifter. He can lift a barbell weighing hundreds of kilograms, but it can only support a few seconds. For the speaker, it may be lifted within a few seconds. The current hits and burns. In the market, you can often see such multimedia speaker products, one with a nominal actual power of 15W, while another speaker with the same integrated phone is marked with a power of 150W (PMPO). Both of these methods of expression It is correct, but the difference between the instantaneous peak power of the speaker and the regular output power of the speaker is very large, and the relationship between them should be 10:1, and may even reach 16:1. Therefore, when you see such words, you must first calculate in your mind to see what his actual power is, and then decide how much power to buy according to the size of the listening room. Don't be greedy and greedy.

　　The power of the speaker is not necessarily related to the sound quality. Its power only determines the size of the sound. Therefore, for a limited room area, the power of the speaker is suitable. For ordinary household users, it is about 15 square meters. For the room, the actual output power of the speaker is 15W×2 or 20W×2. If the sound is not loud enough, you can consider a 30W×2 or 50W×2 speaker, but in actual applications, the power is doubled. The sound pressure only increases by three decibels. Therefore, in most cases, the difference in sound pressure between 50W×2 power and 20W×2 power will not be too great. For listening to music, three-point equipment, seven-point environment, if you put two 12-inch or more floor-standing speakers in a small room of 10 square meters and use more than 200 watts of power to drive, the room will definitely move. Shan shook, his hair was tight, and he couldn't breathe. How could he appreciate Cai Qin's sweet singing?

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