7.12. Alignments for predetermined frequency-response shapes
As with the loudspeaker in a closed-box enclosure, we can choose a predetermined frequency-response shape and engineer the loudspeaker accordingly using an alignment table, which we shall generate in this section. In the interest of simplifying our analysis, let us redraw Fig. 7.24 to be as shown in Fig. 7.25, referring the mechanical and acoustical quantities to the electrical side. Furthermore, we have assumed that at low frequencies we can ignore
R
AR1 and
R
AR2, and that the effects of the box and port resistances,
R
AB
and R
AP
, respectively, can be accounted for by adjusting the value of R
AL
. It has been found in practice that R
AL
is the dominant source of ...
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