Show real loud speaker residents of berlin germany re cen bently aly listened to the str strains alris of must from a loud speaker 25 miles away the sp speakers enkers voice was said to equal the volume of an orchestra of 2000 pieces placed on a roof tor for thil test by a german electrical concern it produced air waves that could be felt on the skin feet away says saya popular science monthly A current of amperes w was it s required to operate it its diaphragm vibrated a full inch to produce its if voice |