Auditory Perspective -Amplifiers

Appreciable care is required in the design of a system which must amplify with great fidelity practically the whole range of audible frequencies and be capable of delivering a high level while at the same time providing a wide volume range. Some of the problems involved are discussed, particularly as applying to the equipment used in the reproduction in Washington D. C., of the Philadelphia Symphony Orchestra playing in Philadelphia. This is the fourth paper in this symposium.