The relationship between speaker sound quality and power

Many customers and friends have this question: The sound quality of the speaker is not directly related to the power?

We know that power determines the maximum sound intensity that the horn can emit. In fact, it is how powerful the sound of the horn can be. According to international standards, there are two labeling methods for power: rated power (RMS: sine wave root mean square) and instantaneous peak power (PMPO power). The former refers to the maximum electric power that drives an 8Ω speaker within the rated range and specifies the waveform continuous analog signal, after a certain interval and repeats a certain number of times, the speaker does not cause any damage; the latter refers to the maximum power that the speaker can withstand in a short time . Take human running as an example. The rated power of the horn is equivalent to the average speed of a lap, and the maximum power is equal to the fastest speed in a lap. You use the maximum power to measure the horn, which is equivalent to letting people run at the fastest speed. Even if you can run, you will be exhausted after running a few laps.

The United States Federal Trade Commission stipulated the power calibration standard in 1974: the effective wattage measured when the harmonic distortion is less than 1% in the range of 20~20000Hz is the effective wattage of the amplifier when driving an 8Ω speaker load with two channels. For output power, the marked power is the rated output power. In order to cater to consumers' psychology, merchants usually mark the instantaneous (peak) power, which is generally about 8 times the rated power. Imagine using the same TDA1521 power amplifier chip (the maximum rated power is 30W, THD=10%), and some products have a nominal 360W, or even 480WP.M.P.O., is this possible? Does it make sense?

Therefore, the rated power shall prevail when purchasing multimedia speakers. That is to say, the RMS value of the speaker is determined, not the maximum power. Taking into account other factors, it can be calculated that if the rated power of the transformer is 100W, the power of the power amplifier chip that it can actually drive smoothly should be below 45W, so by calculating the speaker transformer The power relationship with the power amplifier can also verify whether the actual rated power of the speaker can reach the nominal value. The power of the speaker is not the bigger the better, and the application is the best. For an ordinary home user's room of about 20 square meters, the real power of 60W (refers to the effective output power of the speaker 30W×2) is enough, but The larger the reserve power of the power amplifier, the better, preferably more than 2 times the actual output power. For example, if the speaker output is 30W, the power amplifier capacity should be greater than 60W. For the HiFi system, the power amplifier power driving the speaker is very large.

Therefore, the power has an acoustic effect on the sound quality to a certain extent, but does not determine the sound quality of the speaker.