A look inside an acoustic chamber where electrical sound equipment is tested.
M/S of a corner of an acoustic chamber "attached to a leading electrical company". C/U panning shot of the bizarre fibreglass spikes on the walls that deaden any excess sounds. M/S of a man walking into the chamber and taking a seat in front of a loudspeaker, another man is fiddling with equipment in the background. C/U of the other man adjusting a microphone over the head of the seated man. M/S of the seated man writing on a clipboard, the other man leaves the chamber shutting the door behind him.
M/S of the other man switching on a reel to reel tape recorder outside the chamber. C/U of the tape recorder. M/S of the man inside the chamber slowly swivelling his chair, listening to the different sounds coming through the loudspeaker which he notes on his clipboard. The purpose of this experiment is to discover the range of noise the loudspeaker can produce - "the noise of the jet is ideal, as it contains sound normally outside the scope of the human ear". M/S of another man outside the chamber turning knobs on a piece of equipment. C/U of a meter on the equipment. M/S, zooming in, of the loudspeaker inside the chamber. Low angle shot of the man inside putting on headphones. C/U of the man in his headphones. M/S of the man taking off his headphones. The man is played the sound of a creaking gate - "although this firm does not specialise in domestic noises, it does find them useful to test their equipment". C/U of the tape recorder. C/U of the loudspeaker. C/U of the man.
C/U of the dial on the meter moving. C/U of a machine printing out graph paper. C/U of the man. Low angle M/S of the man inside the chamber writing.