PD18E-AD is a low profile, very high output, self-powered double 18” bass system designed for permanent installation. The PD18E-AD provides perfectly flat response down to 8 hertz when used in conjunction with the 8 hertz Integrator.Our external rack mount Infra-MXB Integrator is recommended to drive a line level Infra™ processed signal to one or more PD18E-AD systems. The PD18E-AD offers a black textured finish and a black coated steel grille.