<s>
Computer	B-Device
speakers	I-Device
,	O
or	O
multimedia	B-Device
speakers	I-Device
,	O
are	O
speakers	O
sold	O
for	O
use	O
with	O
computers	O
,	O
although	O
usually	O
capable	O
of	O
other	O
audio	O
uses	O
,	O
e.g.	O
</s>
<s>
Most	O
such	O
speakers	O
have	O
an	O
internal	O
amplifier	O
and	O
consequently	O
require	O
a	O
power	O
source	O
,	O
which	O
may	O
be	O
by	O
a	O
mains	O
power	O
supply	O
often	O
via	O
an	O
AC	O
adapter	O
,	O
batteries	O
,	O
or	O
a	O
USB	B-Protocol
port	O
.	O
</s>
<s>
The	O
signal	O
input	O
connector	O
is	O
often	O
a	O
3.5	O
mm	O
jack	B-Device
plug	I-Device
(	O
usually	O
color-coded	O
lime	O
green	O
per	O
the	O
PC	O
99	O
standard	O
)	O
;	O
RCA	B-Protocol
connectors	I-Protocol
are	O
sometimes	O
used	O
,	O
and	O
a	O
USB	B-Protocol
port	O
may	O
supply	O
both	O
signal	O
and	O
power	O
(	O
requiring	O
additional	O
circuitry	O
,	O
and	O
only	O
suitable	O
for	O
use	O
with	O
a	O
computer	O
)	O
.	O
</s>
<s>
Battery-powered	O
wireless	O
Bluetooth	B-Protocol
speakers	O
require	O
no	O
connections	O
at	O
all	O
.	O
</s>
<s>
Altec	O
Lansing	O
claims	O
to	O
have	O
created	O
the	O
computer	B-Device
speaker	I-Device
market	O
in	O
1990	O
.	O
</s>
<s>
Computer	B-Device
speakers	I-Device
range	O
widely	O
in	O
quality	O
and	O
in	O
price	O
.	O
</s>
<s>
Computer	B-Device
speakers	I-Device
sometimes	O
packaged	O
with	O
computer	O
systems	O
are	O
small	O
,	O
plastic	O
,	O
and	O
have	O
mediocre	O
sound	O
quality	O
.	O
</s>
<s>
Some	O
computer	B-Device
speakers	I-Device
have	O
equalization	O
features	O
such	O
as	O
bass	O
and	O
treble	O
controls	O
.	O
</s>
<s>
Bluetooth	B-Protocol
speakers	O
can	O
be	O
connected	O
with	O
a	O
computer	O
by	O
using	O
an	O
Aux	O
jack	O
and	O
compatible	O
adaptor	O
.	O
</s>
<s>
More	O
sophisticated	O
computer	B-Device
speakers	I-Device
can	O
have	O
a	O
subwoofer	B-Application
unit	O
to	O
enhance	O
bass	O
output	O
.	O
</s>
<s>
The	O
larger	O
subwoofer	B-Device
enclosure	I-Device
usually	O
contains	O
the	O
amplifiers	O
for	O
the	O
subwoofer	B-Application
and	O
the	O
left	O
and	O
right	O
speakers	O
.	O
</s>
<s>
Some	O
computer	B-Device
displays	I-Device
have	O
rather	O
basic	O
speakers	O
built-in	O
.	O
</s>
<s>
Laptop	B-Device
computers	I-Device
have	O
built-in	O
integrated	O
speakers	O
,	O
usually	O
small	O
and	O
of	O
restricted	O
sound	O
quality	O
to	O
conserve	O
space	O
.	O
</s>
