Shure 300 User Guide
222
HARTREY AVE., EVANSTON, IL.,
GENERAL
The Model 300 ribbon microphone is a rugged
stand-mounted unit with a wide range frequency response and a bidirectional polar pattern. The Model
300 is an excellent choice for broadcasting or record-
ing studios as well as for critical sound reinforcement
applications. The microphone's symmetrical front and
rear pickup and its greatly reduced side pickup make
it ideal for such uses as across-the-table interviews
or dialogue, stages with loudspeakers directly to the
side or overhead, and combined pickup of facing instrumental groups in recording studios.
The Model 300 is supplied with a
switch that provides either flat or rolled off low frequency response and with an impedance-selection
switch allowing choice of three rated impedances:
"L"-38 ohms, "Mu-150 ohms, and "H"-high im-
A
pedance.
built-in vibration isolator and internal
ribbon protection make the microphone suitable for a
wide variety of applications.
Microphone Features:
Ribbon microphone with wide range response
m
Switch selectable flat or rolled off low end
Bidirectional polar pattern, ideal for interviews
m
Internal ribbon protection assures reliable opera-
tion under rigorous operating conditions
Built-in vibration isolator and lifetime swivel
Convenient impedance selection switch, micro-
phone usable with all amplifiers
60204
U.S.A.
.
Voice/Music
AREA CODE 312/866-2200
.
CABLE: SHUREMlCRO
SPECIFICATIONS
Type
Ribbon
Frequency Response
40 to 15,000
a
-
+I0
3
I
9
O
u
5
-10
20
Polar Pattern "High" for connection to high-impedance micro-
Bidirectional-uniform with frequency, symmetrical phone inputs. Three-position impedance change
about axis (see Figure
Copyright
27A297
1979,
(SA)
Hz
(see Figure 1)
X)
I00 lW0
TYPICAL
Shure
Brothers
FREOUEWCV
IN
HERTZ
FREQUENCY
FIGURE
2)
lnc.
RESPONSE
1
10,000
2Cpoo
(OVER)
-----
3,000
HERTZ
,
. . .
. , . . . . . . . . .
.
10,000
HERTZ
FIGURE 2
Impedance
Multiple. "L": Microphone rating impedance is 38
ohms (40 ohms actual) for connection to microphone inputs rated at 19 to 75 ohms. "M": Microphone rating impedance is 150 ohms (260 ohms
actual) for connection to microphone inputs rated
at 75 to 300 ohms.
"H": ~icrophone impedance is
switch.
Printed
Patent:
in
D-171.055
U.S.
U.S.A.
Output Level (at 1,000 Hz)
Open Circuit
Voltage*
......
"
L"
"M" "H"
-85.5 dB -77.0 dB -56.0 dB
(.053 mV) (.I41 mV) (1.58 mV)
Power Level'*
*O
dB = 1 volt per microbar
...
-
57.5 dB - 57.0 dB
**0 dB = 1 milliwatt per 10 microbars
Switches
Rotary
~oice/~usic response switch and rotary
impedance selection switch
Cable
6.1 m (20 ft) two-conductor shielded,
rubberjacketed, broadcast type, with three-pin professional
audio connector* (female) on microphone end
*Designed to mate
series, or equivalent connector
with
Cannon
XL
series, Switchcraft
A3
Swivel and Shock Mount Assembly
Positive action, permits tilting head through
shock-mounted with internal rubber vibration isolator, suitable for mounting on stand with
%"-27
thread
Case
Dark-gray enamel die casting and light-gray brass
screen
Dimensions
See Figure 3
(Q.G.]
135",
TRANSFORMER
n
f
BLUE
VOICE
SWITCH
,.
RANG
-
MUSIC
INTERNAL
CASE
MICROPHONE
RECEPTACLE
CONNECTIONS
FIGURE
POSlTlVE PRESSURE PRODUCES
POSITIVE VOLTAGE AT PIN
WITH RESPECT TO PIN
CABLE-
ASSEMBLY
4
PLUG
2
3
ARCHITECTS' SPECIFICATIONS
The microphone shall be a moving ribbon type with
a frequency response of 40 to 15,000 Hz. The microphone shall have a bidirectional polar characteristic;
the cancellation at the sides shall be 12 to 20 dB. The
unit shall have multiple rating impedances of 38 ohms,
150 ohms, and high impedance. The microphone output shall be:
38 ohms
............................
-57.5 dB
(0 dB = 1 milliwatt per 10 microbars)
150 ohms
....
>.
......................
-57.0 dB
(0 dB = 1 milliwatt per 10 microbars)
High impedance
......................
-56.0 dB
(0 dB = 1 volt per microbar)
The microphone shall be equipped with a
lowfrequency-response selection switch and an impedance-selection switch. The microphone shall also be
equipped with a built-in shock-mounted swivel suitable
for mounting on a stand with a
crophone shall be provided with a detachable
%"-27 thread. The mi-
6.lm
(20 ft) two-conductor shielded cable equipped with a
three-pin female audio connector designed to mate
with Cannon
series, Switchcraft A3
(Q.G.)
series,
XL
or equivalent male connector. The overall dimensions
of the microphone shall be 234.2 mm
height, 36.5
mm (1-7116 in.) in width, and 52.4 mm
(9-7132 in.) in
(2-1116 in.) in depth.
The microphone shall be Shure Model 300 or
equivalent.
Net Weight
581.5 grams
(1 Ib, 4 oz)
Packaged Weight
1.28 kg (2 Ib, 13 oz)
REPLACEMENT PARTS
Cartridge
Cable
...................................
......................................
OVERALL
FIGURE
DIMENSIONS
3
R30
C50
GUARANTEE
This Shure product is guaranteed in normal use to
be free from electrical and mechanical defects for a
period of one year from date of purchase. Please
retain proof of purchase date. This guarantee includes
all parts and labor. This guarantee is in lieu of any
and all other guarantees or warranties, express or
implied, and there shall be no recovery for any consequential or incidental damages.
SHIPPING INSTRUCTIONS
Carefully repack the unit and return it prepaid to:
Shure Brothers Incorporated
Attention: Service Department
1501 West Shure Drive
Arlington Heights, Illinois 60004
If outside the United States, return the unit to your
dealer or Authorized Shure Service Center for repair.
The unit will be returned to you prepaid.
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