Etymotic The BEAN® Quiet Sound Amplifier® - Manual (Page 10)

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: The BEAN comes 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.
ON/OFF
The BEAN turns on and off by opening
and closing the battery door.
Note: It is not necessary to remove the
battery as long as the door is open wide
enough to disable the circuit.
Battery Door
ON = Closed
OFF = Open
Operation