Abstract: A compact portable high acoustic power loudspeaker system is described. A plurality of speakers are mounted inside an enclosure which is sealed. A passive radiator is also provided which is symmetrically disposed inside the enclosure relative to the speakers so as to be subjected to a generally uniform acoustic loading. A high compliance radiator is employed by dispensing with a central spider radiator support with a mass selected to obtain a high efficiency and good low frequency response. A foam gasket is used to help seal the enclosure while also serving to disperse high frequency sound and improve acoustic coupling opposite high frequency speakers.