Owner's Manual
Table Of Contents
IMPORTANCE
OF
A DEEP SEAL
Note: Hearing amplifier devices
come
with
a large
selection
of
eartips, including
two
sizes
of
3-flange
eartips
with
long
stems. Depending on
your
ear
geometry,
the
longer
stems may
allow
the
deepest
seal.
A
deep
eartip
seal ensures
the
best
performance
and
prevents
the
"hollow
voice"
sound, called
the
occlusion effect.
• The occlusion
effect
is
caused
by
sound
transmission
into
the
ear
from
vibration
of
the
ear canal
wall
when
the
ear
is
occluded
by
an
eartip.
• The
vibration
comes
from
sound pressure
developed
in
the
back
of
the
mouth.
• The occlusion
effect
is
most
commonly
caused
by
vibration
from
a person's
own
voice,
especially
from
speaking
the
sounds
"ee"
and
"uu,"
or
from
playing a brass
or
woodwind
musical instrument.
• The occlusion
effect
is
worse
when
there
is
a
shallow insertion
of
the
eartip.
• Deeply-sealed eartips reduce
the
occlusion effect.
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