Two methods of labeling speaker power

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 powerful the sound from the speaker can be. According to international standards, there are two methods for marking power: rated power (RMS: root mean square of sine wave) and instantaneous peak power (PMPO power). The former refers to driving an 8Ω loudspeaker within the rated range, and the waveform continuously simulates the signal. After a certain interval and repeated a certain number of times, the maximum electrical power of the loudspeaker without any damage; the latter refers to the maximum power the loudspeaker can withstand in a short time . The US Federal Trade Commission stipulated the standard for power calibration in 1974: driving 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 to 20000 Hz is the amplifier ’s The 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 that the same is the TDA1521 power amplifier chip using PHILIPS (maximum rated power 30W, THD = 10%), and some products are nominally 360W, or even 480WP.MPO, is this possible? Is it meaningful? So buy multimedia The speaker should be subject to 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 some 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 successfully drive 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 as large as possible, and the application is the best. For the room of about 20 square meters for ordinary home users, the real 60W power (referring to the effective output power of the speaker 30W × 2) is sufficient, but The larger the reserve power of the power amplifier, the better, preferably more than twice the actual output power. For example, if the speaker output is 30W, the power amplifier capacity is preferably greater than 60W. For HiFi systems, the power of the amplifier that drives the speaker is very large.
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Speaker power

Speaker power There is no direct relationship between the sound quality of the speaker and the power. power

Posted at 2009-12-28 10:58 • 140 views
Speaker power
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