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[* black] At long last we've found the [http://www.sonos.com/shop/products/play3|advertised] [http://en.wikipedia.org/wiki/Passive_radiator_(speaker)|bass radiator], a passive speaker cone secured in the very back of the case that forms an inexpensive alternative to a powered subwoofer.
-[* black] Interested in knowing how a bass radiator works? Wonder no more. As the mid-range drivers move back and forth, some of the sound shoots out the front, while the rest is pushed back inside the enclosure. A bass radiator allows that low frequency sound to exit the enclosure in a controlled way, without taking up excess room like a port or vent does.
+[* black] 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 [http://en.wikipedia.org/wiki/Reflex_port|reflex port] in an enclosure, without taking up a lot of space.