At long last we've found the advertised bass radiator, a passive speaker cone secured in the very back of the case that forms an inexpensive alternative to a powered subwoofer.

Interested in knowing how a bass radiator works? Wonder no more. As the mid-range drivers move back and forth, they create air pressure inside the enclosure. A bass radiator uses that air pressure to create a "bassier" sound, without taking up excess room. It's similar in principle to a reflex port in an enclosure, without taking up a lot of space.