Although the protection circuit
is fairly simple, it forms an
effective guard against overload
of the input of amplifiers and
loudspeakers. Why these inputs
may need protection now that
line levels have been standardized
is because there are signal
sources on the market that generate
outputs of several volts
instead of the standardized 1 V
r.m.s. Also, in some applications,
the loudspeaker signal is
applied to the line output of a
separate amplifier via a voltage
divider, in which case the levels
may be well above 1 V r.m.s.
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