3.7. Examples of transducer calculations
Example 3.6. An ideal moving-coil loudspeaker produces 2
W of acoustic power into an acoustic load of 4
×
104
N
s/m5 when driven from an amplifier with a constant voltage output of 1.0
V rms. The area of the diaphragm is 100
cm2. What open-circuit voltage will it produce when operated as a microphone with an rms diaphragm velocity of 10
cm/s?
Solution. From Fig. 3.35 we see that, always,

The power dissipated W gives us the rms volume velocity of the diaphragm U
rms:
Get Acoustics: Sound Fields, Transducers and Vibration, 2nd Edition now with the O’Reilly learning platform.
O’Reilly members experience live online training, plus books, videos, and digital content from nearly 200 publishers.