The Reflex SB121 is a high-power sub bass enclosure designed to operate over the 34 – 95 Hz pass band. The Reflex SB121 has a range of applications within both touring and fixed installation. It may be combined with products from the iQ or MQ ranges within fixed installation, or used as a ground stacked infra sub bass for larger Optima array touring systems.

The cabinet houses a single 21” long excursion cone driver with neodymium magnet structure which is loaded into a twin chamber band pass structure.The enclosure is manufactured from 18mm birch plywood and coated in a heavy duty polyurea finish. The cabinet front has a protective steel grill coated in a water-resistant powder coat finish which has an acoustically transparent filter medium bonded to its back surface. Each cabinet has four handles and the option of rear panel mounted castors. The cabinet base has polyethylene runners and the cabinet top panel housings to aid cabinets when stacked in vertical columns. Three cabinets in a vertical stack have the option of being used in a cardioid mode with the bottom cabinet inverted.