product description: 
HLS-218 is a vented dual 18-inch high-power subwoofer, with full-frequency or high-frequency use. Designed for a variety of flow or speech and music sound reinforcement applications where a fixed installation. HLS-218 consists of two coil diameter of 4 inches (100mm) of the 1200-watt high-power ultra-low frequency of elements of a single 18-inch subwoofer, with relatively small volume of the box for easy installation and display a variety of environments. Case selection of high-quality 18mm high density birch plywood manufacture, minimize large dynamic state resonance box; in order to obtain a lower nonlinear distortion and low-frequency limit, better low frequency flexibility and higher output, and unit cabinet design into a new concept and technology, environmentally friendly water-surface mining multilayer black waterproof paint, wiring board after two parallel Neutrik NL4MP socket, hexagonal steel mesh hole with a special sound-permeable mesh, in ensuring the effective transmission of sound case, provides better protection unit.