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Thiele 论文2Loudspeakers in Vented Boxes: Part II
A. N. THIELE Australian Broadcasting Commission, Sydney, N.S.W. 2001, Australia
Editor's Note: Part I of Loudspeakers in Vented Boxes was published in the May, 1971 issue of the Journal. VIII. LOUDSPEAKER EFFICIENCY In Eq. (12) an expression was derived for the efficiency of a loudspeaker in a box, which consists of three parts, We have considered, in the meantime, the third part which varies with frequency. We now consider the first two parts. Thus the basic efficiency
'1ob = (Po/47rc) (BeleSa2/Rd_2ms).
(66)
relationship of Ra to the optimum load impedance depends in the first place on the nature of the output device, transistor, pentode, or triode. Furthermore, Rg can be manipulated by feedback techniques (see Section XII) to almost any desired va
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