BEAN Quiet Sound Amplifier, User Manual, Page: 10 / 16

10
Importance of a Deep 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.
Note: QSA 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.