Strannik’s fire extinguishers/loud speakers have “served the country well.” Unlike other manufacturers who might have settled for plastic cabinets looking like fire extinguishers with a cheap audio response, Strannik opted for the real thing. These speakers have been loaded with phono-absorbant material, which keeps the inevitable ringing to a minimum. Ringing is a fact of life with metal containers as they reach the right frequency, and Strannik hoped to minimize this with his creation of the round section of the cabinet, which helps to break up standing waves of sound. - See more at: http://inventorspot.com/articles/russian_innovation_once_fire_extinguisher_now_speaker_22440#sthash.DJF4MWtn.dpuf