The V-mas VBS18 is a compact 18" passive subwoofer designed to reproduce low bass more efficiently than traditional front loaded design. The perfect system for mobile DJ's or band... powerful, extended LF response. Easy to transport with many recessed handles for ease of handling and dolly board with casters which clip onto the front which also protects grill in transport. Features one M20 pole mount socket for mounting sattelite speakers for single sub per side application in upright position. The box has rubber feet on the bottom as well as on the side with recessed ribbing allowing them to be stacked sideways and locked together for larger horn loaded arrays.