Shure VR300 User Manual
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222 HARTREY AVE , EVANSTON, IL, 60204 U.S.A.
AREA CODE 31 21866-2200
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MICROPHONES
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AND
TWX:
91 0-231 -0048 TELEX. 72-4381
ELECTRONIC
CABLE: SHUREMICRO
COMPONENTS
DATA
MODEL
SHEET
VR300
A
UNIDIRECTIONAL DYNAMIC MICROPHONE
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GENERAL
This microphone is designed especially for use in computer voice recognition applications. It
for other uses such as paging, talkback, and other
communication-type applications where excellent voice
fidelity and reduction of background noises are needed.
The frequency response is tailored to produce an essentially constant output voltage over the voice spectrum
when used close to the sound source. The transducer is
a low-impedance, moving coil type with integral
bucking coil.
The microphone case is aluminum with a black enameled finish. It has a standard
mounting on a flexible gooseneck, fixed pipe, or microphone stand. The unit is supplied with an attached
two-conductor shielded cable with a built-in strain
relief.
5/a"-27 thread suitable for
is also suitable
hum-
100 1,000 l0,OOO 20,000
*Distance from lips to microphone grille
TYPICAL FREQUENCY RESPONSE
Impedance
170 ohms actual
Output Level
Open Circuit Voltage*
Power Level**
*O
dB = 1V1100 @bar
**0 dB = 1
Phasing
Positive pressure on diaphragm produces positive
voltage on white conductor with respect to black
conductor (see Figure 2)
VOICE
COIL COIL
Hum Pickup
Maximum 15 dB equivalent SPL in 1 mOe field
Cable
1.2m (4 ft) two-conductor shielded
Case
Aluminum with black enameled finish; stainless
steel screen
Dimensions
See Figure
Net Weight
128 grams (4.5 oz)
mWI10 ybar
HUMBUCKING CABLE
INTERNAL CONNECTIONS
3
FREOUENCY
FIGURE
IN
HERTZ
1
...........
.................
,-,---------
-
[,r
;
BLACK
-I
WHITE
:
SHIELD
- - - -
- - - -
FIGURE
2
-41.0 dB (8.9 mV)
-59.5dB
Ti;
I
=,
-
SPECIFICATIONS
Type
--Dynamic, Unidirectional (cardioid), Close-Talking
Frequency Response
100 to 7,000
Copyr~ght
27A8048
1982,
(BL)
Hz
(see Figure 1)
Shure Brothers
Inc
OPERATION
To obtain the best performance with the VR300, the
microphone must be used in a close-talking manner.
The lips should be as close to the microphone grille as
comfort permits, with a distance of 1 to 5 cm (0.4 to 2 in.)
providing the greatest discrimination between voice
and background noise.
Pr~nted
In
U.S.A.
OVERALL DIMENSIONS
FIGURE
3
ACOUSTIC CONSIDERATIONS
The close-talking characteristics of the VR300
Microphone are obtained through its tailored frequency
response, directionality, and distance discrimination.
The acoustical elements are designed to optimize performance in the frequency range of
results in substantial reduction of sounds outside the
desired range and proper control of sounds within the
desired range. The microphone rejects noise through its
I00 to 7,000 Hz. This
:
inherenl
against
favor of
directional properties, and it discriminates
unwanted sounds arriving from a distance in
sounds arriving from a near source.
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
222 Hartrey Avenue
Evanston, Illinois 60204
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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