What are the indicators to measure the quality of speakers

　　1. Power

　　The sound quality of the speaker is not directly related to the power. Power determines the maximum sound intensity that can be emitted by the speaker, which is just how powerful the sound can be.

　　According to international standards, there are two ways to label power:

　　Rated power (RMS: root mean square of sine wave) refers to the maximum electrical power that drives an 8 Ω loudspeaker within the rated range with a specified waveform continuous analog signal, without any damage to the loudspeaker after a certain interval and a certain number of repetitions;

　　Instantaneous peak power (PMPO power) refers to the maximum power that the loudspeaker can withstand in a short time.

　　The Federal Trade Commission of the United States stipulated the power calibration standard in 1974: drive an 8 Ω loudspeaker load with two sound 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, and its marked power is the rated output power. In order to cater to consumers' psychology, businesses usually mark the instantaneous (peak) power, which is generally about 8 times of the rated power.

　　The power of the speaker is not as high as possible, and the application is the best. For a room of about 20 square meters for ordinary household users, the real power is 60W (the effective output power of the speaker is 30W × 2) It is enough, but the larger the reserve power of the power amplifier, the better. It is better to be more than twice the actual output power. For example, if the speaker output is 30W, the power amplifier capacity is better than 60W. For HiFi system, the power amplifier driving the speaker is very large.

　　2. Frequency range and frequency response

　　Frequency range: refers to the range between the lowest effective playback frequency and the highest effective playback frequency that can be replayed by the audio system;

　　Frequency response: refers to the phenomenon that when an audio signal output at a constant voltage is connected to the system, the sound pressure generated by the speaker increases or attenuates with the change of frequency, and the phase changes with the frequency. This change relationship (change amount) of sound pressure and phase with frequency is called frequency response, in decibels (dB).

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