<s>
The	O
dust	B-Device
cap	I-Device
(	O
also	O
known	O
as	O
dust	O
dome	O
,	O
or	O
dome	O
)	O
is	O
a	O
gently	O
curved	O
dome	O
mounted	O
either	O
in	O
concave	O
or	O
convex	O
orientation	O
over	O
the	O
central	O
hole	O
of	O
most	O
loudspeaker	O
diaphragms	B-Device
.	O
</s>
<s>
It	O
protects	O
the	O
inner	O
mechanics	O
(	O
such	O
as	O
the	O
pole	O
pieces	O
and	O
the	O
voice	B-Device
coil	I-Device
)	O
from	O
small	O
particles	O
(	O
which	O
can	O
cause	O
rubs	O
)	O
and	O
other	O
contamination	O
.	O
</s>
<s>
Dust	B-Device
caps	I-Device
can	O
also	O
contribute	O
structural	O
integrity	O
to	O
the	O
voice	B-Device
coil	I-Device
assembly	O
or	O
the	O
cone	B-Device
.	O
</s>
<s>
In	O
some	O
loudspeaker	O
designs	O
dust	B-Device
caps	I-Device
can	O
also	O
be	O
part	O
of	O
the	O
acoustic	O
design	O
of	O
the	O
driver	O
by	O
radiating	O
high	O
frequency	O
energy	O
or	O
suppressing	O
it	O
.	O
</s>
<s>
Typically	O
the	O
dust	B-Device
cap	I-Device
is	O
made	O
of	O
the	O
same	O
material	O
as	O
the	O
cone	B-Device
.	O
</s>
<s>
In	O
some	O
tweeter	B-Device
designs	O
,	O
the	O
dome	O
is	O
in	O
fact	O
the	O
only	O
sound	O
radiating	O
surface	O
and	O
so	O
it	O
performs	O
both	O
roles	O
.	O
</s>
