The design, consisting of an
electric microphone, amplifier,
and moving-coil meter,
arranges for the meter to give
a reading that is linearly proportional
to the sound pressure.
Sound pressure merers
usually bave a logarithmic
scale, but this would make the
design more coruplicated.
Moreover, linear proportionality
rcsults in greater sensitivity
to sound pressure differences.
If a test CD with noise
bands in 60-Hz steps is available,
the meter may be used
to obtain a frequency characteristic
of a loudspeaker.
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