On the debit side, the PR nonnally suffers from the nonlinearity of its suspension elements at high excursions. The benefit of a PR is primarily the reduction of port air turbulence that may afflict a ported system if its port area is inadequate. It is the added compliance that sets the system apart from the standard ported system, and if the compliance is made large enough, the behavior of the system over the useful passband is very close to that of a conventional ported system (Small 1974). As shown in Figure 4-14b, the simplified mobility circuit shows the compliance of the PR in parallel with its mass. The PR is nonnally chosen to be of the same diameter as the active driver. Impulse response of a ported system as a function of Q". The passive radiator (PR) resembles a cone driver without a motor it is effectively a mass with related compliance and mechanical damping used in place of a port. It will be instructive to compare these two figures with their corresponding ones for sealed systems, Figures 4-4 and 4-5.Ĥ.6 The Passive Radiator Figure 4-14a shows a section view of a LF system with a passive radiator ("drone cone" and auxiliary bass radiator are other terms for the passive radiator). Figure 4-13 shows the response of ported systems to an impulse function as a function of Qtc. (Data after Small 1973.)įigure 4-12 shows the relation between enclosure volume, /3, and system efficiency that can be realized with ported systems. Maximum efficiency of a ported system as a function of fl and enclosure volume. The Butterworth type, sixth-order (B6) alignment.įigure 4.12.
KLUWER ACADEMIC PUBLISHERS BOSTONIDORDRECHTILONDONĭistributors for North, Central and South America: Kluwer Academic Publishers 101 Philip Drive Assinippi Park Norwell, Massachusetts 02061 USA Telephone (781) 871-6600 Fax (781) 871-6528 E-Mail Distributors for all other countries: Kluwer Academic Publishers Group Distribution Centre Post Office Box 322 3300 AH Dordrecht, THE NETHERLANDS Telephone 31 78 6392 392 Fax 31 786546474 E-Mail ~.įrequency (Hz) Figure 4♱1.
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