<s>
The	O
Electro-Voice	B-Algorithm
RE20	I-Algorithm
is	O
an	O
American	O
professional	O
cardioid	O
dynamic	O
microphone	B-Application
,	O
commonly	O
used	O
in	O
broadcasting	B-Operating_System
applications	O
since	O
1968	O
.	O
</s>
<s>
Designed	O
by	O
Electro-Voice	O
using	O
the	O
company	O
's	O
patented	O
Variable-D	O
technology	O
and	O
a	O
large-diaphragm	O
element	O
,	O
it	O
has	O
been	O
described	O
as	O
an	O
industry	O
standard	O
"	O
iconic	O
"	O
microphone	B-Application
for	O
its	O
natural	O
sound	O
and	O
its	O
wide	O
usage	O
in	O
radio	O
,	O
television	O
and	O
recording	O
studios	O
.	O
</s>
<s>
The	O
RE20	O
was	O
modified	O
in	O
the	O
late	O
1980s	O
with	O
neodymium	O
magnet	O
structure	O
,	O
resulting	O
in	O
the	O
RE27N/D	B-Algorithm
model	O
.	O
</s>
<s>
A	O
blue-gray	O
version	O
was	O
produced	O
in	O
the	O
1990s	O
:	O
the	O
PL20	B-Algorithm
.	O
</s>
<s>
Two	O
black-colored	O
models	O
are	O
also	O
available	O
,	O
with	O
the	O
RE320	B-Algorithm
having	O
a	O
switch	O
to	O
select	O
a	O
curve	O
for	O
voice	O
and	O
a	O
setting	O
tailored	O
for	O
miking	B-Application
a	O
kick	O
drum	O
.	O
</s>
<s>
In	O
1953	O
,	O
Electro-Voice	O
(	O
EV	O
)	O
developed	O
the	O
Variable-D	O
technology	O
to	O
reshape	O
the	O
microphone	B-Application
pickup	O
area	O
into	O
a	O
cardioid	O
directional	O
pattern	O
,	O
using	O
only	O
one	O
transducer	B-Algorithm
element	O
.	O
</s>
<s>
A	O
major	O
improvement	O
was	O
the	O
elimination	O
of	O
problems	O
with	O
the	O
proximity	O
effect	O
,	O
achieved	O
by	O
directing	O
sound	O
waves	O
to	O
the	O
rear	O
of	O
the	O
transducer	B-Algorithm
element	O
through	O
multiple	O
ports	O
in	O
the	O
housing	O
.	O
</s>
<s>
The	O
polished	O
aluminum	O
model	O
664	O
microphone	B-Application
was	O
the	O
first	O
Variable-D	O
product	O
,	O
followed	O
by	O
the	O
cheaper	O
,	O
lower	O
quality	O
665	O
,	O
and	O
the	O
high	O
quality	O
olive	O
drab	O
–	O
painted	O
666	O
,	O
the	O
latter	O
becoming	O
popular	O
with	O
television	O
studios	O
and	O
broadcasters	O
.	O
</s>
<s>
The	O
666	O
was	O
relatively	O
heavy	O
,	O
with	O
a	O
prominent	O
ridge	O
in	O
the	O
housing	O
containing	O
the	O
ports	O
and	O
ducting	O
,	O
so	O
in	O
the	O
1960s	O
EV	O
replaced	O
it	O
with	O
the	O
RE15	O
,	O
a	O
lightweight	O
,	O
slender	O
microphone	B-Application
with	O
a	O
row	O
of	O
ports	O
in	O
the	O
handle	O
representing	O
EV	O
's	O
new	O
"	O
Continuously	O
Variable-D	O
"	O
design	O
.	O
</s>
<s>
EV	O
wanted	O
to	O
create	O
a	O
dynamic	O
microphone	B-Application
that	O
could	O
compete	O
with	O
the	O
high	O
fidelity	O
of	O
condenser	O
microphones	B-Application
,	O
and	O
they	O
assigned	O
the	O
task	O
to	O
engineer	O
Tom	O
Lininger	O
.	O
</s>
<s>
The	O
microphone	B-Application
came	O
with	O
a	O
switch	O
to	O
tailor	O
the	O
mid-bass	O
response	O
,	O
attenuating	O
frequencies	O
below	O
400Hz	O
with	O
a	O
mild	O
high-pass	O
filter	O
.	O
</s>
<s>
Like	O
all	O
premium	O
microphones	B-Application
made	O
by	O
EV	O
,	O
it	O
used	O
EV	O
's	O
1930s	O
humbucker	O
method	O
of	O
reducing	O
electromagnetic	O
interference	O
by	O
wiring	O
a	O
humbucking	O
coil	O
out	O
of	O
polarity	O
with	O
the	O
microphone	B-Application
element	O
coil	O
.	O
</s>
<s>
The	O
microphone	B-Application
's	O
element	O
was	O
positioned	O
relatively	O
far	O
from	O
the	O
grille	O
to	O
keep	O
announcers	O
from	O
getting	O
too	O
loud	O
.	O
</s>
<s>
In	O
1986	O
,	O
EV	O
began	O
releasing	O
microphones	B-Application
with	O
rare	O
earth	O
neodymium	O
magnets	O
in	O
the	O
transducer	B-Algorithm
assembly	O
.	O
</s>
<s>
The	O
RE20	O
concept	O
was	O
given	O
this	O
new	O
configuration	O
,	O
resulting	O
in	O
the	O
RE27N/D	B-Algorithm
model	O
.	O
</s>
<s>
The	O
RE27N/D	B-Algorithm
also	O
came	O
with	O
extra	O
tone-shaping	O
filters	O
:	O
a	O
steep	O
high-pass	O
filter	O
attenuating	O
the	O
bass	O
frequencies	O
below	O
200Hz	O
,	O
a	O
mild	O
high-pass	O
filter	O
below	O
1,000	O
Hz	O
,	O
and	O
a	O
high-frequency	O
boost	O
for	O
"	O
presence	O
"	O
.	O
</s>
<s>
The	O
PL	O
Series	O
was	O
introduced	O
by	O
EV	O
in	O
1990	O
to	O
attract	O
the	O
recording	O
studio	O
market	O
,	O
including	O
a	O
dark	O
blue-gray	O
version	O
of	O
the	O
RE20	O
with	O
the	O
designation	O
PL20	B-Algorithm
;	O
this	O
model	O
is	O
discontinued	O
.	O
</s>
<s>
In	O
2011	O
,	O
the	O
black	O
RE320	B-Algorithm
model	O
was	O
rolled	O
out	O
to	O
address	O
the	O
popular	O
usage	O
on	O
bass	O
drum	O
(	O
kick	O
drum	O
)	O
,	O
complete	O
with	O
a	O
switch	O
to	O
tailor	O
the	O
frequency	O
response	O
.	O
</s>
<s>
The	O
broadcasting	B-Operating_System
field	O
used	O
a	O
variety	O
of	O
microphones	B-Application
including	O
the	O
German	O
Sennheiser	B-Algorithm
MD	I-Algorithm
421	I-Algorithm
(	O
1960	O
)	O
and	O
the	O
American	O
SM5	O
(	O
1966	O
)	O
by	O
Shure	O
.	O
</s>
<s>
One	O
complaint	O
was	O
that	O
the	O
RE20	O
was	O
less	O
suited	O
to	O
soft-spoken	O
people	O
,	O
but	O
the	O
added	O
sensitivity	O
of	O
the	O
RE27N/D	B-Algorithm
solved	O
that	O
problem	O
in	O
the	O
late	O
1980s	O
.	O
</s>
<s>
The	O
large	O
size	O
and	O
weight	O
of	O
the	O
RE20	O
requires	O
a	O
strong	O
microphone	B-Algorithm
stand	I-Algorithm
or	O
boom	O
arm	O
,	O
and	O
a	O
very	O
sturdy	O
microphone	B-Application
clip	O
or	O
robust	O
hanging	O
yoke	O
.	O
</s>
<s>
An	O
optional	O
shock-mount	O
is	O
available	O
for	O
the	O
RE20	O
family	O
of	O
microphones	B-Application
:	O
the	O
EV	O
model	O
309A	O
.	O
</s>
<s>
The	O
309A	O
is	O
based	O
on	O
a	O
steel	O
yoke	O
with	O
rubber	O
suspension	O
cords	O
surrounding	O
a	O
metal	O
cage	O
to	O
hold	O
the	O
microphone	B-Application
.	O
</s>
<s>
This	O
mount	O
greatly	O
reduces	O
vibrations	O
carried	O
through	O
the	O
microphone	B-Algorithm
stand	I-Algorithm
or	O
boom	O
arm	O
.	O
</s>
<s>
Title	O
character	O
Frasier	O
Crane	O
(	O
Kelsey	O
Grammer	O
)	O
appeared	O
to	O
speak	O
into	O
the	O
microphone	B-Application
to	O
deliver	O
psychiatry	O
advice	O
on	O
talk	O
radio	O
.	O
</s>
<s>
Other	O
users	O
of	O
the	O
RE20	O
family	O
of	O
microphones	B-Application
include	O
film	O
director	O
Robert	O
Altman	O
.	O
</s>
<s>
When	O
he	O
was	O
depicting	O
the	O
making	O
of	O
A	O
Prairie	O
Home	O
Companion	O
radio	O
show	O
,	O
Altman	O
's	O
2006	O
fictionalized	O
film	O
featured	O
eight	O
RE27N/D	B-Algorithm
microphones	B-Application
used	O
by	O
the	O
singers	O
and	O
announcers	O
,	O
serving	O
as	O
their	O
actual	O
microphones	B-Application
,	O
not	O
just	O
dummy	O
props	O
.	O
</s>
<s>
As	O
well	O
,	O
the	O
distance	O
from	O
the	O
grille	O
to	O
the	O
element	O
allowed	O
Wonder	O
to	O
stay	O
in	O
contact	O
with	O
the	O
microphone	B-Application
while	O
singing	O
,	O
without	O
overdriving	O
the	O
element	O
.	O
</s>
<s>
For	O
Carlos	O
Santana	O
's	O
1999	O
Supernatural	O
album	O
,	O
Kolotkin	O
placed	O
RE20s	O
on	O
the	O
electric	O
guitar	O
cabinets	O
,	O
along	O
with	O
other	O
microphones	B-Application
to	O
be	O
mixed	O
in	O
combination	O
.	O
</s>
<s>
In	O
a	O
2010	O
vocal	O
microphone	B-Application
shootout	O
hosted	O
by	O
Sound	O
on	O
Sound	O
magazine	O
,	O
the	O
RE20	O
was	O
judged	O
the	O
best	O
for	O
male	O
rapper	O
vocals	O
,	O
and	O
it	O
scored	O
highly	O
on	O
other	O
vocal	O
types	O
.	O
</s>
<s>
The	O
early	O
podcasters	O
used	O
broadcast	B-Operating_System
microphones	B-Application
of	O
proven	O
designs	O
,	O
such	O
as	O
the	O
Shure	B-Algorithm
SM7B	I-Algorithm
and	O
the	O
RE20	O
family	O
.	O
</s>
<s>
The	O
EV	O
RE320	B-Algorithm
began	O
to	O
grow	O
in	O
popularity	O
because	O
of	O
its	O
lower	O
price	O
.	O
</s>
<s>
RE27N/D	B-Algorithm
–	O
Shiny	O
"	O
satin	O
"	O
metallic	O
finish	O
on	O
steel	O
.	O
</s>
<s>
PL20	B-Algorithm
–	O
Same	O
as	O
RE20	O
but	O
with	O
navy	O
blue	O
finish	O
.	O
</s>
<s>
RE320	B-Algorithm
–	O
Black	O
finish	O
on	O
steel	O
,	O
introduced	O
in	O
2011	O
.	O
</s>
<s>
Same	O
element	O
as	O
RE27N/D	B-Algorithm
.	O
</s>
