The D18E-R is a very high output INFRA subwoofer system designed to provide high fidelity extended low frequency audio reproduction from a relatively small enclosure. The D18E-R provides perfectly flat response down to 8 Hertz when used in conjunction with the 8 Hertz Integrator. Designed for portable use, the D18E-R includes handles, protective corners, casters, a grille cover and a pole mount adapter on a carpeted enclosure.