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Speaker performance indicators
- Mar 20, 2018 -

Performance

The main performance indicators of the loudspeaker are: sensitivity, frequency response, rated power, rated impedance, directivity and distortion and other parameters.

1, rated power

The speaker's power is divided into nominal power and maximum power. Nominal power rated power, distortion power. It refers to the maximum input power of the speaker in the rated undistorted range. The power marked on the speaker's trademark and technical specification is the power value. Maximum power refers to the peak power that the speaker can withstand at a certain moment. In order to ensure the reliability of the loudspeaker, the maximum power of the loudspeaker is required to be 2 to 3 times of the nominal power.

2, rated impedance

The impedance of the speaker is generally related to the frequency. The rated impedance is the impedance measured from the input of the loudspeaker when the audio frequency is 400Hz. It is generally 1.2 to 1.5 times the DC resistance of the voice coil. The common impedance of common dynamic speaker is 4Ω, 8Ω, 16Ω, 32Ω and so on.

3, frequency response

When a speaker is applied with an audio signal of the same voltage but different frequencies, the sound pressure generated by the speaker will change. The sound pressure generated during normal audio is relatively large, and the sound pressure generated during low audio and high audio is small. The high and low frequency range when the sound pressure drops to a certain value of the middle audio frequency is called the frequency response characteristic of the speaker.

The ideal loudspeaker frequency characteristic should be 20~20KHz so that all audio can be reproduced evenly, but this is impossible. Each speaker can only play back a good part of the audio.

4, distortion

The phenomenon that the speaker cannot reproduce the original sound realistically is called distortion. There are two kinds of distortion: frequency distortion and nonlinear distortion. The frequency distortion is caused by the strong sounding of the signals of some frequencies and the weak sounding of the signals of other frequencies. The distortion destroys the proportion of the original high and low sound levels and changes the original sound colors. The non-linear distortion is caused by the fact that the vibration of the speaker vibration system and the fluctuation of the signal are not completely consistent, and a new frequency component is added to the output sound wave.

5, pointing characteristics

It is used to characterize the sound pressure distribution characteristics of loudspeakers radiating in all directions in space. The higher the frequency is, the narrower the directivity is, and the larger the paper cone is, the stronger the directivity is.