Professional Speaker, Professional Amplifier, PRO Audio manufacturer / supplier in China, offering Powered DSP Column Array System – Each Group Includes 2 X (3× 4.5") Full-Range Columns + 1 X 15" Active Subwoofer, Srx835p 1600W High-Power 15 Inch Three-Way Active Full Frequency Speaker, Ferrite Magnet Perfect Sound Quality 15 Inch Professional Woofer Speaker Driver and so on.