Introduction Of Common Parameters Of Loudspeaker

- Sep 19, 2018-

Rated Impedance: Rated impedance is the minimum impedance of the speaker and is an indicator of how much power the speaker can consume from the amplifier. For example, a 100W amplifier has an output power of 100W at 4 ohms, a 50 ohm speaker with only 8 watts, and a 2 ohm speaker can theoretically get 200 watts.

Sensitivity: For the speaker, the sensitivity is to apply 1W of input power to the speaker, and how many decibels of sound pressure can be generated 1m away from the front of the unit axis. For an amplifier, sensitivity is the amount of voltage applied to the input when the rated output power or voltage is reached, so it is also called input sensitivity.

Dynamic range: The level difference between the strongest part of the signal and the weakest part. For equipment, the dynamic range indicates the ability of the equipment to handle both strong and weak signals.

Frequency response: provided by the manufacturer, refers to the curve of the sound pressure level of the loudspeaker system as a function of frequency measured by the constant pressure method under the free sound field condition at the specified position on the reference axis from the reference point.

Total Harmonic Distortion: Harmonic distortion is a kind of distortion caused by amplitude nonlinearity. In the free field condition, when the sinusoidal signal of a certain frequency is fed to the speaker system with the specified power, in addition to the acoustic signal outputted by the speaker system. In addition to the original input signal (fundamental frequency), there are twice as many signals as three times the frequency of the fundamental frequency called harmonic distortion. The percentage of the ratio of the root mean square value of these harmonic sound pressures to the characteristic sound pressure value is the characteristic harmonic distortion coefficient. ,

The pointing characteristics of the speaker: the distribution of the sound pressure radiated by the speaker in space. At low frequencies, the radiation surface of the speaker is much smaller than the wavelength of the sound wave radiated by the speaker. The speaker can be regarded as a point source, and its radiation is non-directional. The directivity characteristic of the speaker will be significantly narrower at high frequencies, thus reducing its effective radiation angle. Therefore, when considering the application frequency of a speaker, not only its axial frequency response, but also its auxiliary shooting direction angle. This has practical significance for the selection of the crossover frequency of two-way or three-way split-type loudspeakers, because not only the axial frequency response of these loudspeakers but also their frequency within a specified angle is required. The sound is connected. Generally, the directivity boundary frequency of a six-inch speaker is about 3500 Hz, the five-inch speaker is about 4200 Hz, and the directivity frequency of an 8-inch speaker is about 2500 Hz.

 

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