Dual Passive Radiators

A passive radiator, which may be a cone-type radiator is employed in a speaker system enclosure facing downwardly in the direction of the floor upon which the enclosure rests. The bottom wall supporting the passive radiator is preferably spaced a relatively short height above the floor by means of a plurality of legs such as four legs defining four output ports through which sound passes below the basic enclosure. The low frequency sound communicated through the four ports may be used to tune the resonator of the speaker system. With the use of the passive radiator maximum loading is obtained and interference effects are minimized. Also, upper base and mid-range internal reflections are prevented from being re-radiated. Because of the maximizing of loading a smaller passive radiator may be employed. Moreover, the concept of the passive radiator of this invention may be employed both in a single channel speaker system and a dual channel speaker system.