Owner's Manual
1'
Caution
Failure
to
follow
these
recommendations
may
severely
reduce
the
amount
of
hearing
protection
provided
by
the
earplugs.
•
At
very
high
SPLs
(above
125
dB
SPL,
where
the
limit
to
attenuation
is
the
eartip
itself),
the
foam
eartips
provide
the
most
protection.
•
Eartips
fit
ear
canal
diameters
of
6-14
mm.
See
eartip
section
for
details.
•
The
following
applies
when
the
device
is
turned
off:
The
level
of
noise
entering
a
person's
ear,
when
a
hearing
protector
is
worn
as
directed,
is
closely
approximated
by
the
difference
between
the
A-weighted
environmental
noise
level
and
the
NRR.
Example
1.
The
environmental
noise
level
as
measured
at
the
ear
is
100
dBA
2.
The
NRR
is
25
decibels
(dB).
3.
The
level
of
noise
entering
the
ear
is
approximately
75
dBA.
Caution:
For
noise
environments
dominated
by
frequencies
below
500
Hz
the
(-weighted
environmental
noise
level
should
be
used.
Although
hearing
protectors
can
be
recommended
for
protection
against
the
harmful
effects
of
impulsive
noise,
the
Noise
Reduction
Rating
(NRR)
is
based
on
the
attenuation
of
continuous
noise
and
may
not
be
an
accurate
indicator
of
the
protection
attainable
against
impulsive
noise
such
as
gunfire.
•
Earplugs
must
be
fitted,
adjusted
and
maintained
to
the
manufacturer's
instructions
to
achieve
the
expected
attenua-
tion
and
hearing
protection.
2