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The sub subwoofer series speakers are paired with two frequency linear array speakers for use as sub subwoofers. The box itself is equipped with hanging components, which can be stacked at a certain height to support the full frequency linear speaker and achieve effective distance diffusion of medium, high, and low frequencies. It can also be hung at the top of a full frequency linear speaker to enhance the comprehensiveness of the sound range. The birth of this series has made the range of two frequency linear array speakers more perfect, the lines more beautiful, and the use more convenient. In various sound environments such as mobile performances, large theaters, sports venues, and multifunctional halls, it can meet the needs of customers. The sound quality is deep, full, rich, and stunning.