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Model 581SF
25
ohms Impedance
Open circuit voltage
_ . _ _ _ _ _ _ _ _ _
-
87.5
db* (.043
mv)
Power Level
. . .
. .
. . .
57.0
db**
EIA
Microphone Rating
G m (Sensitivity)
....__..._.___
-152.5
db***
*
0 db
=
I
volt per microbar
***
0 db
=
EIA
Standard
SE-105,
August
1949.
Switch:
Built-in
"ON-OFF''
switch with lockplate fur-
nished. Microphone is shipped wifh lockplate
installed.
To lock switch i n
"ON"
position,
loosen screw on lockplate and turn lockplate
I
80°.
Retighten screw.
Shock Mom*:
Internal vibration-isolation of rubber
construction.
Case:
Die-cast and "Armo-Dur".
Case Finish:
Chrome and Gray with stainless steel
Dimensions:
See Figure
A.
**
0
db
=
I
milliwaft with
10
microbars
grille.
/
I
~
l
!
~
r
n
)
~
~
j
(38.1 mm)
(6.4 mm)
f
1 ' ? ( 6
(46.0 mm)
13
' 3 2
(10.3 mm)
OVERALL DIM E N S IONS
FIGURE A
Net Weight:
13
OZ.
(369
gms)
FURNllSHED ACCESSORIES:
Cable:
Highly
durable with exceptionally effective
hum shielding.
Model
581SA
Detachable
I 5
f o o t
(4.6
meter) one-conductor
shielded cable
with
microphone
connector.
Detachable 15-foot
(4.6
meter) one-conductor
shielded cable with microphone connector and
a standard phone plug attached.
Detachable 18-foot (5.5 meter) two-conductor
shielded
cable
with
microphone
connector
attached.
Model A25B, long life,
high
quality swivel connector, lined
with a long-life nylon sleeve for
noise free and scratch-free in-
sertion and removal o f micro-
phone.
Model
58 I
SA-MP
Model 581SF and
581SB
Swivel Adapfer:
Guarantee:
This
Skure product i s guaranteed in
normal use t o be free from electrical and mechanical
defects for a period of one year from the date o f
purchase. Please retain proof o f purchase date.
This
guarantee includes all parts and labor.
' I
Skipping ins#ructisns:
Carefully repack the unit
and return
it
prepaid t o the factory.
If
outside the
United States, return the unit t o your dealer or Author-
ized Shure Service Center for repair. The unit will b e
returned t o you prepaid.
70
TO
250
HERTZ
TYPICAL DIRECTIONAL PATTERN
FIGURE B
7 . 0 0 0
TO IO.OOOHERTZ
TYPICAL DIRECTIONAL PATTERN
FIGURE B
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