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Two labeling methods of speaker power

2021-04-12 107
The sound quality of speakers has no direct relationship with power.

The power determines the maximum sound intensity that the speaker can emit, and it feels like how powerful the sound of the speaker 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 .

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 to 20000 Hz is the effective wattage measured when an 8Ω speaker load is driven by two channels. For output power, the marked power is the rated output power.


Two labeling methods of speaker 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 the TDA1521 power amplifier chip using PHILIPS (maximum rated power 30W, THD=10%), and some products have a nominal 360W, or even 480WP.MPO. Is this possible? Does it make sense? So I am shopping for multimedia The speaker should be based on the rated power.
 
The power of the speaker is mainly determined by the power of the power amplifier chip and the power of the power transformer. 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 power relationship between the speaker transformer and the power amplifier, you 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.
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