The TD-118B is a cost-effective subwoofer that carefully selects a single 18" speaker design, coupled with a sturdy and reasonably designed housing, so that the low frequency is extended to 30Hz to ensure the perfect performance of the low frequency effect in the cinema. The woofer uses a long stroke large magnetic circuit design, which can not only improve distortion, but also increase the heat capacity of the system, reduce power compression, and ensure high stability of the product. Suitable for small cinema.