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There Are Many Kinds Of Speakers
Aug 18, 2017

Speaker also known as the Speaker box, he is the work in different frequency bands of loudspeakers in a specially designed box, by the frequency divider to the power amplifier output signal, divided into high-frequency, if, low-frequency signals, respectively, to the corresponding speakers for playback system. The variety of speakers, Speakers functional range, classification methods are different, the common classification methods are as follows:

By use: Floor speaker, active speaker, surround speaker, bookshelf-type speaker, * * Speaker. According to the frequency of work: subwoofer, multi-frequency speaker, 2-frequency speaker, 3-frequency speaker. According to the internal structure: sealed speaker, inverted-type speaker, empty paper basin type speaker, symmetrical drive-type speaker, maze-type speaker, dumbbell-type speaker. The following is an introduction to the commonly used speakers:

(1) Sealed speaker structure

It is composed of box, Speakers loudspeaker and sound absorbing material. Behind the speaker is sealed, the front is left with the speaker mouth, it will be installed in a fully-enclosed enclosure, the sound of the box is basically punished, the speaker before and after the sound wave to separate.

Features have a good low-frequency response, playback bass deep, and because the speaker is completely closed (in addition to the speaker), Speakers so to prevent the phenomenon of acoustic short-circuit. But the air in this kind of loudspeaker has damping effect, which affects the resonant frequency and quality factor of the speaker. Because of the sound-absorbing material in the speaker, Speakers it consumes some sound energy, so the sensitivity of the sealed speaker is lower.

(2) Inverted-phase speaker structure

Structure and closed speakers are basically the same, just in the speaker panel opened a reverse-phase hole, in the case of inverted-phase tube installed, the role of the inverted hole is to the speaker radiation through the inverted phase tube, and the sound wave in front of the loudspeaker overlay, Speakers to improve the frequency characteristics to make the low-frequency more rich, can make the low frequency band sensitivity increase 5dB. The structure of the inverted-phase speaker is shown in Fig. -155 (b).

The characteristic has the advantages of high sensitivity and stable performance. At the same time, the resonant function of box and pipe can be used to expand low frequency, Speakers so as to enhance the low-frequency effect and improve the amplitude distortion of low frequency lower limit. The disadvantage of the speaker is that the instantaneous characteristic is not as good as the sealed speaker.

(3) Empty paper basin type speaker structure empty paper basin speaker is in the inverted-phase speaker based on the development of the speaker. The speaker is equipped with a loudspeaker and an empty paper basin, and the empty paper basin is installed in the inverted phase of the inverted-type speaker position.

Features and inverted-phase speakers are basically the same, Speakers due to the role of empty paper basin, so that the sensitivity of the speaker is higher.

Speaker (also known as a class speaker), the speaker output level of two (or two) transistors are always in a conductive state, that is, whether there is no signal input to maintain the conduction current, and the two currents equal to the peak of AC power, then the communication in the maximum signal condition into the load. Speakers When there is no signal, two transistors each circulate the equivalent current, so there is no unbalanced current or voltage at the output center point, so no current input speaker. When the signal tends to positive, the output transistor above the line allows the inflow of more current, the lower output transistor is relative to reduce the current, Speakers as a result of current imbalance, so into the speaker and push the speaker audible. The working mode of the speaker has the best linearity, each output transistor amplifies the signal full wave, there is no cross distortion (switching distortion), even if the negative feedback is not applied, its open-loop distortion is still very low, so it is called as the most ideal amplifying circuit design for sound.