There is a term "frequency range" in the sound. The unit is called "Hz", which is generally 20Hz-20KHz. It mainly means that the natural sound from low to high is roughly a range of 20Hz to 20kHz. The function of the speaker is to reproduce the sound within this range.
It is basically impossible for a pair of speakers to replay all these frequency bands without distortion, and the cost is very high. The more bass, the larger the volume of the speaker is required, and the more difficult it is to adjust the sound. Moreover, the speaker with less low frequency is cheaper and the sound is easy to do. When listening to music, most music does not need very low frequency, The requirements are mainly good and beautiful, so there are many kinds of speakers on the market, such as floor boxes, bookshelf boxes, satellite boxes, etc., large and small, many sizes, and they have their own needs and trade-offs.
Generally, people who are familiar with the sound can roughly understand how low the low frequency can be played by this pair of speakers by looking at the speaker caliber and the size of the box, even if it is low-frequency diving, such as bookshelf box 50Hz, 60Hz, floor box 25Hz, 30Hz, etc.
Don't be too superstitious about parameters. Except that the world's top brands are very rigorous, the parameters marked on most cheap speakers are inaccurate and have no practical significance. In the end, you have to feel them with your ears.
If the floor box is too large, it is not easy to place, and the low frequency of the bookshelf box is not enough, so some people think of adding an independent large-diameter speaker to play low-frequency sound, which can also supplement the problem of insufficient bass. Later, the more experience, it is found that the main speaker can even be the size of a fist, In addition, the subwoofer can also achieve the effect of large speaker. It not only has low cost, but also is easy to place and beautiful.
Although adding subwoofer can make up for the low frequency of bookshelf box or satellite box, it is very difficult to really adjust and produce good results. Therefore, most of hifi circles will not add subwoofer. Bookshelf box is used for listening to human voice and string music, and floor box is used for listening to symphony.
If the requirements are not very high, this way of adding subwoofer is very marketable. For example, one or two hundred sets of computer multimedia audio can be owned. The main function of subwoofer is to make up for the lack of medium and low frequency of small speakers. Many people think that one more subwoofer is very cost-effective, not only cheap, but also more bass, But I don't know the subwoofer effect of this computer speaker is wrong. Experienced people will buy bookshelf boxes instead.