_{ P }and ${\tilde{e}}_{\text{in}}$ while keeping the sound pressure constant. Hence ...

We can see from Eqs. (15.19) and (15.20) that to maximize the radiated sound pressure, the field strength E
_{
P
}/d should be as close to its maximum allowable value as possible, which is around 2
kV/mm. Similarly, we generally set the maximum peak signal voltage
$\frac{1}{2}{\tilde{e}}_{\text{in}}$
to the same value as the polarizing voltage E
_{
P
} because the maximum sound pressure is proportional to the product of the two, but their sum should not exceed 4
kV/mm.

If the gap distance d is reduced, we can reduce both E
_{
P
} and
${\tilde{e}}_{\text{in}}$
while keeping the sound pressure constant. Hence ...

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