The subwoofer specializes in the sound with the longest sound wave, and this sound will have a very intense psychological feeling, and other human senses will also feel it! Due to the limited volume of ordinary speakers, they are unable to emit low-frequency sound of longer wavelengths, so a larger volume subwoofer is needed to produce a low-frequency warm effect. In theory, the larger the size of the speaker, the better. Large caliber subwoofers can perform better in the long wave section.