SEIWIN SL1002ad ACTIVE LINE ARRAYS SPEAKER (3 PIECES) are a set of three speakers designed to work together to project sound effectively. Each speaker is an "active" speaker, meaning it has its own built-in amplifier. "Line array" refers to the arrangement of the speaker elements in a line, which helps to distribute sound over a wider area.The SL1002AD active line array incorporates a Class D bi-amplification system and advanced Digital Signal Processing (DSP). It features a waterproof coating, dual 10-inch transducers with 2-inch voice coils, and a 2-inch voice coil compression driver. Connectivity includes XLR input and output, with high-frequency compensation for extended projection distances and indoor compensation for managing room reverberation.