Analysis of the box structure of seven commonly used speakers

There are many types of speakers on the market, and their uses are quite different. In the classification of speakers, they can be classified according to the sounding principle of the speakers, or according to the different structures of the speaker cabinets. Today, the editor of the KTV speaker brand BIK will introduce you to the cabinet structures of seven commonly used speakers. One Get up and understand!
At present, speakers are classified according to the different structures inside the cabinet, including sealed speakers, inverted speakers, labyrinth speakers, sonic tube speakers, and multi-cavity resonant speakers. Each type of speaker has its own characteristics and functions. The most commonly used ones are inverted speakers and sealed speakers.
Analysis of the box structure of seven commonly used speakers

1. Airtight speaker
The speaker system of this kind of speaker is the simplest, which is to install the speaker unit in a fully sealed box. It can completely isolate the forward and backward radiated sound waves of the loudspeaker, but due to the existence of the closed box, the rigidity of the loudspeaker's motion mass to produce resonance is increased, and the lowest resonant frequency of the loudspeaker is increased.
The closed speaker has good bass analysis and a slightly deep sound. When using ordinary hard folding ring speakers, a large cabinet with a large volume is required to obtain an ideal bass reproduction. The new small airtight speakers are also called air-cushioned speakers. They use high-compliance speakers with an appropriate Q value and use the elastic effect of the compressed air quality enclosed in the cabinet. The air cushion behind the cone will exert a reaction force on the cone.
2. Inverted speaker
Inverted speakers can reproduce rich bass with a smaller cabinet, and are currently the most widely used speakers. It has a wider bandwidth than the closed type, higher sensitivity, and less distortion. Ideally, the lower limit of the low frequency playback frequency can be as much as 20% lower than the speaker resonance frequency.
3. Acoustic resistance speakers
This kind of speaker is actually a deformation of the phase-inverted speaker. It is filled with sound-absorbing material or structure in the sound outlet duct, which acts as a semi-closed box to control the phase-inversion and buffer it to reduce the anti-resonance frequency to broaden the bass replay. Frequency band.
4. Transmission line speaker

Transmission line speaker is also called labyrinth or labyrinth because its sound ducts are mostly stacked in a labyrinth shape. It is equipped with sound ducts made of sound-absorbing panels on the back of the speaker, the length of which is required to increase the wavelength of low-frequency sound. 1/4 or 1/8. The transmission line speaker has a mild damping and tuning effect, which increases the sound output of the speaker near or below the resonance frequency, and reduces the amount of stroke while enhancing the bass output.

5. Passive radiating speaker
This kind of speaker is a bass reflex speaker. Its opening sound outlet is replaced by an empty paper cone without a magnetic circuit and voice coil. The radiation produced by the passive cone vibration and the forward radiated sound of the speaker are in the same phase. The composite sound and the passive cone mass formed by the air in the body and the passive cone support component form resonance to enhance the bass.
It has the advantage of avoiding the unstable sound produced by the reflection of the sound hole, and it can obtain good sound radiation effect even if the volume is not large, so the sensitivity is high, which can effectively reduce the working amplitude of the speaker, and the standing wave affects the sound. Clear and transparent.
6. Coupled cavity speaker
The output of the coupled cavity speaker is output by the sound hole driven by one side of the cone, and the other side of the cone is coupled with a closed box. The advantage of this kind of speaker is that the amount of air pushed by the speaker at low frequencies is greatly increased. Since the coupling cavity is a tuning system, when the cone movement is restricted, the output of the sound outlet does not exceed the sound output of a single cone, which broadens the low frequency weight. Amplify the range, so the distortion is reduced, and the withstand power is increased.
7. Folding horn speaker
Folding horn speakers are more suitable for home use. The horn of its horn is coupled with a larger air load at the mouth, and the diameter of the drive end is small. The back of this kind of speaker is fully sealed, and the pressure in the chamber is mostly on the back of the speaker cone. The inverted horn is usually installed in front of the loudspeaker in order to keep the pressure balance before and after the cone. The sound effect of this kind of speakers is better than that of closed speakers and bass reflex speakers.
The above is all about the "Analysis of the Cabinet Structure of Seven Common Speakers" shared by the editor of the KTV speaker brand BIK. No matter what cabinet structure the speaker adopts, it cannot be separated from the acoustic design of the cabinet. At the same time, speakers with different cabinet structures have their own unique sound effects, which are suitable for different occasions, and there is no absolute strong and weak. BIK is a Japanese company specializing in the development of karaoke speakers, KTV speakers, KTV amplifiers, card package speakers and other audio equipment.
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