Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 HORN LOUD SPEAKER SYSTEMS 167 two degrees of freedom. The compliance of the suspension system and the comphance of the air chamber are chosen so that very high efficiency is obtained over the range required for intelligible speech. A typical effi- ciency characteristic of this type of loud speaker suitable for acoustic out- puts of 500 to 1000 watts is shown in Fig. Due to the large audio power amplifier requirements, high loud speaker efficiency is an extremely important econo
Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 HORN LOUD SPEAKER SYSTEMS 167 two degrees of freedom. The compliance of the suspension system and the comphance of the air chamber are chosen so that very high efficiency is obtained over the range required for intelligible speech. A typical effi- ciency characteristic of this type of loud speaker suitable for acoustic out- puts of 500 to 1000 watts is shown in Fig. Due to the large audio power amplifier requirements, high loud speaker efficiency is an extremely important economic factor. B. Multiple Horn Multiple Channel System. — The two channel or ' two way ' system2^'^^ is the most common example of a multichannel an HIGH FREQUtNCY UNIT LOW FREQUENCY UNIT A^ CROSS SECTION LOW FREQUENCY UNIT
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