<s>
wOOx	B-Device
Technology	I-Device
(	O
rendered	O
wOOx	B-Device
)	O
is	O
a	O
brand	O
created	O
by	O
Philips	O
to	O
identify	O
loudspeaker	O
systems	O
that	O
employ	O
passive	B-Architecture
radiator	I-Architecture
technology	O
along	O
with	O
active	O
equalization	O
to	O
maximize	O
the	O
output	O
of	O
the	O
passive	O
diaphragm	O
.	O
</s>
<s>
wOOx	B-Device
Technology	I-Device
optimizes	O
the	O
active	O
bass	O
driver	O
,	O
the	O
passive	O
bass	O
radiator	O
,	O
and	O
the	O
active	O
equalization	O
curve	O
to	O
obtain	O
maximum	O
low-frequency	B-Algorithm
reproduction	O
in	O
a	O
relatively	O
compact	O
configuration	O
.	O
</s>
<s>
The	O
primary	O
element	O
of	O
a	O
wOOx	B-Device
Technology	I-Device
speaker	O
system	O
is	O
the	O
bass	O
radiator	O
.	O
</s>
<s>
The	O
wOOx	B-Device
bass	O
radiator	O
(	O
referred	O
to	O
in	O
marketing	O
literature	O
as	O
the	O
wOOx-Slave	O
)	O
is	O
functionally	O
indistinguishable	O
from	O
typical	O
"	O
passive	B-Architecture
radiator	I-Architecture
"	O
diaphragms	O
previously	O
employed	O
in	O
loudspeaker	O
systems	O
.	O
</s>
<s>
Early	O
wOOx	B-Device
radiators	O
used	O
a	O
patented	O
design	O
with	O
two	O
foam-rubber	O
suspension	O
rings	O
instead	O
of	O
the	O
typical	O
single	O
ring	O
,	O
and	O
a	O
symmetrical	O
sandwich	O
construction	O
.	O
</s>
<s>
Typical	O
passive	B-Architecture
radiator	I-Architecture
theory	O
dictates	O
that	O
the	O
passive	B-Architecture
radiator	I-Architecture
should	O
be	O
capable	O
of	O
displacing	O
at	O
least	O
twice	O
the	O
volume	O
of	O
air	O
that	O
the	O
active	O
driver	O
displaces	O
through	O
its	O
own	O
stroke	O
.	O
</s>
<s>
To	O
satisfy	O
this	O
requirement	O
,	O
passive	B-Architecture
radiators	I-Architecture
traditionally	O
have	O
a	O
larger	O
surface	O
area	O
than	O
the	O
active	O
driver	O
.	O
</s>
<s>
The	O
dual-suspension	O
design	O
of	O
the	O
wOOx	B-Device
bass	O
radiator	O
allows	O
the	O
radiator	O
to	O
undergo	O
extreme	O
excursions	O
,	O
so	O
the	O
wOOx	B-Device
radiator	O
displaces	O
the	O
necessary	O
air	O
volume	O
without	O
being	O
larger	O
than	O
the	O
active	O
driver	O
,	O
enabling	O
easier	O
integration	O
into	O
consumer	O
electronics	O
products	O
.	O
</s>
<s>
More	O
recent	O
embodiments	O
of	O
the	O
wOOx	B-Device
bass	O
radiator	O
use	O
a	O
single-roll	O
suspension	O
.	O
</s>
<s>
The	O
wOOx	B-Device
radiator	O
incorporates	O
a	O
mass	O
element	O
in	O
the	O
center	O
of	O
its	O
diaphragm	O
,	O
which	O
is	O
used	O
to	O
adjust	O
the	O
tuning	O
frequency	O
of	O
the	O
loudspeaker	O
enclosure	O
.	O
</s>
<s>
In	O
this	O
sense	O
,	O
a	O
loudspeaker	O
enclosure	O
with	O
passive	B-Architecture
radiators	I-Architecture
emulates	O
a	O
mass-spring	O
system	O
,	O
much	O
like	O
the	O
helmholtz	O
resonator	O
devices	O
(	O
bass	O
reflex	O
ports	O
)	O
more	O
commonly	O
used	O
to	O
tune	O
loudspeaker	O
enclosures	O
.	O
</s>
<s>
However	O
,	O
the	O
amount	O
of	O
mass	O
suspended	O
on	O
a	O
passive	B-Architecture
radiator	I-Architecture
diaphragm	O
enables	O
extremely	O
deep	O
tuning	O
frequencies	O
to	O
be	O
possible	O
in	O
small	O
enclosures	O
.	O
</s>
<s>
However	O
,	O
like	O
any	O
passive	B-Architecture
radiator	I-Architecture
system	O
,	O
it	O
is	O
possible	O
to	O
damage	O
the	O
bass	O
radiator	O
by	O
driving	O
it	O
beyond	O
its	O
mechanical	O
limits	O
.	O
</s>
<s>
To	O
avoid	O
this	O
,	O
some	O
wOOx	B-Device
systems	O
use	O
an	O
additional	O
reflex	O
vent	O
,	O
having	O
the	O
same	O
tuning	O
as	O
the	O
wOOx	B-Device
radiator	O
.	O
</s>
<s>
In	O
loudspeaker	O
systems	O
that	O
rely	O
on	O
resonant	O
augmentation	O
of	O
the	O
output	O
of	O
the	O
active	O
driver	O
(	O
these	O
include	O
bass-reflex	O
systems	O
,	O
passive	B-Architecture
radiator	I-Architecture
systems	O
,	O
bandpass	O
systems	O
,	O
and	O
transmission-line	O
systems	O
)	O
,	O
the	O
resonant	O
system	O
absorbs	O
the	O
acoustic	O
load	O
from	O
the	O
active	O
loudspeaker	O
driver	O
,	O
decreasing	O
the	O
necessary	O
cone	O
excursion	O
to	O
achieve	O
high	O
output	O
at	O
low	B-Algorithm
frequencies	I-Algorithm
.	O
</s>
<s>
The	O
same	O
is	O
true	O
for	O
systems	O
that	O
use	O
wOOx	B-Device
technology	I-Device
,	O
in	O
which	O
the	O
wOOx	B-Device
radiator	O
absorbs	O
the	O
acoustic	O
load	O
from	O
the	O
active	O
driver	O
.	O
</s>
<s>
Because	O
the	O
wOOx	B-Device
radiator	O
is	O
capable	O
of	O
greater	O
excursion	O
than	O
the	O
active	O
driver	O
without	O
increasing	O
distortion	O
,	O
it	O
is	O
desirable	O
to	O
excite	O
the	O
wOOx	B-Device
radiator	O
as	O
much	O
as	O
possible	O
,	O
to	O
keep	O
the	O
excursion	O
of	O
the	O
active	O
driver	O
at	O
a	O
minimum	O
while	O
maximizing	O
the	O
output	O
of	O
the	O
loudspeaker	O
system	O
.	O
</s>
<s>
One	O
benefit	O
of	O
the	O
wOOx	B-Device
bass	O
radiator	O
(	O
and	O
passive	B-Architecture
radiators	I-Architecture
in	O
general	O
)	O
when	O
compared	O
to	O
the	O
more	O
common	O
bass-reflex	O
vents	O
is	O
that	O
there	O
is	O
no	O
possibility	O
of	O
air	O
turbulence	O
noise	O
if	O
the	O
resonant	O
system	O
is	O
greatly	O
excited	O
.	O
</s>
<s>
Many	O
wOOx-equipped	O
mini-stereo	O
systems	O
produced	O
by	O
Philips	O
feature	O
a	O
three-level	O
equalization	O
control	O
which	O
applies	O
additional	O
bass	O
equalization	O
at	O
frequencies	O
which	O
excite	O
the	O
wOOx	B-Device
bass	O
radiator	O
,	O
improving	O
the	O
visceral	O
'	O
impact	O
 '	O
of	O
the	O
bass	O
through	O
the	O
wOOx	B-Device
radiator	O
's	O
extreme	O
air	O
displacement	O
capability	O
.	O
</s>
<s>
This	O
use	O
of	O
active	O
equalization	O
to	O
increase	O
overall	O
system	O
output	O
is	O
the	O
primary	O
characteristic	O
that	O
differentiates	O
wOOx	B-Device
technology	I-Device
from	O
typical	O
loudspeaker	O
systems	O
equipped	O
with	O
passive	B-Architecture
radiators	I-Architecture
.	O
</s>
<s>
In	O
addition	O
to	O
Philips	O
 '	O
own	O
use	O
of	O
wOOx	B-Device
Technology	I-Device
,	O
the	O
technology	O
also	O
appeared	O
in	O
products	O
sold	O
by	O
Kenwood	O
and	O
Microsoft	O
.	O
</s>
<s>
Also	O
,	O
some	O
Philips	O
products	O
display	O
"	O
wOOx²	O
"	O
branding	O
,	O
though	O
apparently	O
without	O
a	O
fundamental	O
change	O
to	O
the	O
wOOx	B-Device
system	O
.	O
</s>
<s>
The	O
only	O
likely	O
difference	O
between	O
wOOx	B-Device
and	O
wOOx²	O
is	O
in	O
the	O
amount	O
of	O
active	O
equalization	O
applied	O
to	O
the	O
system	O
.	O
</s>
<s>
A	O
common	O
marketing	O
slogan	O
used	O
by	O
Philips	O
for	O
products	O
with	O
wOOx	B-Device
Technology	I-Device
is	O
"	O
Hear	O
the	O
bass	O
,	O
feel	O
the	O
difference	O
"	O
.	O
</s>
<s>
This	O
is	O
a	O
list	O
of	O
products	O
which	O
feature	O
wOOx	B-Device
Technology	I-Device
,	O
though	O
it	O
is	O
not	O
exhaustive	O
.	O
</s>
