PD18E-R is a self-powered double 18” bass system designed for portable use. The PD18E-R 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-R systems. The PD18E-R offers a black Ro Tex™ finish and a black coated steel grille.