A device is described designed for the study of man's spatial hearing. Its basic element is an arc (radial distance - 1.5 m) along which a source of sound (a dynamic loudspeaker) mounted on a carriage is being moved. The device significantly increases the accuracy of measuring the thresholds of sound localization; besides it permits a wider range of a subject's activity to be measured. An original method for graphical representation of results is also suggested.