What is the function of the subwoofer?

                                              What is the function of the subwoofer?

A subwoofer, commonly known as a subwoofer, is a speaker device specially used to relax the bass. Generally speaking, we divide audio into subwoofer, bass, low midrange, midrange, midrange, treble, supertreble, etc. Subwoofer refers to the bass whose reproduction frequency lower limit is above 20Hz. When replaying large dynamic music or movie sound effects, the subwoofer is more important than traditional floor-standing stereo speakers, and the sound effects it brings are majestic and dynamic.

What is the role of the subwoofer

The main function of the subwoofer is to improve the sound quality, increase the bass texture of the sound, and effectively strengthen the effect of the syllable rhythm. With it, the restoration of the program source can be made more solid, without it, it will give people a feeling of lack of strength and energy. For example, in a movie theater or in reality, we can feel the shock of power and energy when an airplane takes off, but if our home theater is not equipped with subwoofer speakers or the configuration is unreasonable, people will not be able to feel this shock, but And that's all.

Subwoofers are mainly divided into two categories, they are passive (PASSIVE) and active (ACTIVE). At present, there are many three-piece "3D" satellite systems (Subwoofer/Satellite S

ystem) with subwoofer speakers and two small main speakers on the market. In this system, only one subwoofer speaker is used, so the subwoofer is a single speaker. The channel (L+R) signal has a stereo effect above the subtone point.

This system uses the volume control knob of the front stage to determine the volume of all speakers. If the sensitivity or volume of the subwoofer is not equal to that of the main speaker, it will cause confusion in the sound field, unbalanced frequency response, and inability to locate the sound image. , and at this time, when the placement of the subwoofer cannot solve this problem, it is difficult to improve these problems.

Classification of subwoofers

vented speaker

There are phase-inverting holes on the speaker panel. Due to the holes, the sound inside the box can be radiated to the outside. It has higher power handling capacity and lower distortion than closed speakers, sufficient low-frequency volume, high sensitivity, and is characterized by wide frequency response, high efficiency, and large sound pressure. Under the same volume and unit conditions, the vented speaker can obtain a lower low-frequency dive cutoff frequency than the closed speaker, thereby reducing the drive power requirements of the amplifier, which is what players often say is "easy to push". ".

Closed speakers

The structure of this kind of speaker is sealed except for the speaker mouth, so that the front and rear of the speaker cone are divided into two spaces that are not ventilated, one is an infinite space outside the box, and the other is an airtight box space with a certain volume. Since the inner and outer spaces of the box are isolated from each other, the phenomenon of acoustic short circuit and mutual interference can be eliminated. It is characterized by relatively simple structure and good transient response.