How to understand the importance of subwoofer?

　　Generally speaking, the subwoofer refers to the bass whose playback frequency is lower than 20Hz. Whether it is replaying large dynamic music or movie sound effects, the importance of subwoofer is even more than that of traditional main channel speaker system. This is because the special sound effects that include a lot of music (symphonies or strings and drums) and many movies are extremely powerful and dynamic bass that is not just for the listener to "hear", but more It is to let them "feel" the atmosphere of this situation.

　　Subwoofers are mainly divided into two categories, which are passive and active. At present, many woofers or bass speakers on the market are passive. An active bass system is actually a subwoofer with a power amplifier, the input signal, and the power supply can work. There are many types of speakers used in car audio, including coaxial, full-range, and separate. The smaller the area of the unit diaphragm, the higher the pitch, and the larger the area, the lower the pitch. Therefore, the audio system must use a variety of speakers of different sizes to fully restore the music.

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