The soul of home theater---subwoofer

                                     The soul of home theater---subwoofer

There is a saying that for a home theater, the subwoofer is the soul. In the view of cinema masters, this statement is really not an exaggeration-if you really have a good subwoofer and it is properly adjusted, then your home theater construction work is at least half successful.

The quality, type, quantity and adjustment of the subwoofer will affect the texture, density, atmosphere, dynamics, sound field, etc. of the theater system, so a good subwoofer is an important foundation of the system.

Why do cinemas have subwoofers?

Why does the same sound system have such a separate speaker in the home theater than in the traditional stereo system.

There are three main reasons why a theater system must have a subwoofer:

1. In the audio system, replaying the low-frequency part consumes the most power, especially the low-frequency part below 100HZ. Separating this part of the low frequency and let the subwoofer be responsible for it alone can minimize the burden on the power amplifier and other speakers, and can achieve smaller sound distortion and better low frequency sound. pressure and dynamics.

2. The low-frequency sound part is most susceptible to the impact of standing waves (for example: there is a booming sound, the texture and details of the low frequency are affected), and when the low frequency of the theater system is provided by the subwoofer, the subwoofer can be placed In the listening room where the standing wave is the smallest, or through the low frequency manager, theater power amplifier with eq adjustment to do standing wave sound processing.

3. Regardless of the sound format of Dolby or DTS, their audio tracks have prepared a separate channel for the subwoofer, named LFE. The corresponding playback speaker is the subwoofer. If the theater system does not have a subwoofer when watching movies, there will be a lot less sound.

The composition of the subwoofer

A subwoofer is actually a speaker that only plays bass, and most subwoofers are active speakers with their own power amplifiers.

He consists of three parts - speakers, cabinets and power amplifiers.

The most common unit sizes for home theater subwoofers are 8 inches, 10 inches, 12 inches, 13 inches, 15 inches, and 18 inches. Cinema Jun has also seen 21-inch home theater subwoofers, but those are extremely rare.

The cabinet of the subwoofer is mostly composed of density boards. Generally speaking, the heavier the cabinet, the higher the density, the better.

In the power amplifier part, attention should be paid to the interface connected to the power amplifier end.

The higher-end guns will give you more interfaces and options. However, the main signal input of the subwoofer is the RCA interface, and the high-end ones have the XLR interface.

The parameters of the subwoofer

For considering the quality of a subwoofer, the most important parameters are unit size, frequency response, rated output power, and weight.

The size of the unit will largely determine the sound style of the subwoofer. Generally, small-sized subwoofers have faster speed and better low-frequency impact. The subwoofer of the large unit has loose low frequency and strong extremely low frequency energy. Of course, there will be exceptions, and specific products need to be discussed in further detail.

The frequency response allows us to know the range of low frequencies reproduced by this subwoofer. The rated output power is equivalent to the subwoofer's engine, and the higher the power, the better.

And through the weight, we can at least know whether the materials used for the gun unit and the cabinet are of sufficient standard, and when the heavy gun is working on the subwoofer, it will not be prone to problems such as movement and jumping that cause sound inaccuracy.