This parameter of power is actually a basic parameter to measure the performance of a speaker. It is only because the manufacturer intentionally avoids it. Therefore, in the description of many products, the power becomes a parameter that has no meaning. There is no direct relationship between the sound quality of the speaker and the power. The power determines the maximum sound intensity that the speaker can emit. It feels like how loud the sound from the speaker can be.
According to international standards, power has two methods of labeling:
1, rated power (RMS: sine wave rms)
Refers to driving an 8Ω speaker within the rated range to specify the waveform continuous analog signal, the maximum electrical power of the speaker without any damage after a certain interval and repeating a certain number of times; the latter refers to the maximum power that the speaker can withstand for a short period of time. The US Federal Trade Commission set the standard for power calibration in 1974: driving an 8Ω speaker load with two channels, and measuring the effective wattage when the harmonic distortion is less than 1% in the range of 20 to 20000 Hz, which is the amplifier's Output power, the indicated power is the rated output power.
2, instantaneous peak power (PMPO power)
Usually, in order to cater to the consumer psychology, the merchants mark the instantaneous (peak) power, which is about 8 times of the rated power. Imagine the same TDA1521 power amplifier chip with PHILIPS (maximum rated power 30W, THD=10%), and some products are nominally 360W, even 480WP.MPO, is this possible? Does it make sense? So buy 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. Considering other factors, it can be calculated that if the rated power of the transformer is 100W, the power of the power amplifier chip that can actually be driven smoothly should be below 45W. Therefore, by counting the power relationship between the speaker transformer and the power amplifier, it is also possible to 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, the application is the best. For the average household user's room of 20 square meters, the true 60W power (the effective output power of the speaker is 30W×2) is enough, but The larger the reserve power of the power amplifier, the better, preferably more than twice the actual output power. For example, if the output of the speaker is 30W, the power of the amplifier is preferably greater than 60W. For the HiFi system, the power of the amplifier that drives the speaker is very large.
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