SW-D4000 is a 12 inches powered subwoofer bass speaker with 800W high power driving and characteristics of wide dynamic range, low distortion and large amplitude. The bass unit is made by solid materials to achieve long term stunning low frequency. As a top 10 audio brand in China, Tonewinner has 30+ years experience in designing and manufacturing acoustic products. As an original supplier, Tonewinner always warmly welcomes distributors, partners and customers around the world.