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## 6.13. Voice-coil design

### Effect of coil size on efficiency

Let us now reconsider Eq. (6.47) to see how to maximize the efficiency in terms of the actual coil dimensions. The resistance R E can be expressed in terms of the mass of the voice-coil winding M MC by writing
$MathML$
(6.82)
where κ is resistivity of voice-coil conductor in units of Ω·m. The value of κ for different materials is given in Table 6.1. a w is radius of wire in m. l is length of voice-coil winding in m.
We also note that the volume occupied by the coil wire is
$MathML$
(6.83)
where for simplicity we are ...

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