Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 FRONT VIEW AMPLIFIER A SIDE VIEW FRONT VIEW AMPLIFIER B SIDE VIEW Fig. Multiple single cone, single coil loud speakers. J. Large low frequency unit, small high frequency unit and filter system. B. Seven small units connected in parallel. cone of this type must be driven by a relatively large coil to obtain a toler- able efficiency. The efficiency of this system is low in the high frequency range. Adequate power handling capacity and response over a wide frequency range may be
Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 FRONT VIEW AMPLIFIER A SIDE VIEW FRONT VIEW AMPLIFIER B SIDE VIEW Fig. Multiple single cone, single coil loud speakers. J. Large low frequency unit, small high frequency unit and filter system. B. Seven small units connected in parallel. cone of this type must be driven by a relatively large coil to obtain a toler- able efficiency. The efficiency of this system is low in the high frequency range. Adequate power handling capacity and response over a wide frequency range may be obtained by employing single coil, single cone loud speaker units in two different arrangements, as follows: First, a large diameter cone driven by a heavy coil for the reproduction of the low frequency range, a small diameter cone driven by a light coil and a filter system for allocating the power in low and high frequency ranges to the two respective low and high frequency loud speaker units, Fig. Second, a sufficient number of small diameter cones to satisfy the low frequency power require- ments and of light construction to satisfy the high frequency response requirements. Fig.
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