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MODEL 515SDX
UNIDIRECTIONAL DYNAMIC MICROPHONE
The Shure Model 515SDX is a dual-impedance, cardioid
(unidirectional) dynamic microphone that is suitable for
speech pickup in schools, churches, and meeting rooms. Its
unidirectional polar pattern greatly reduces feedback.
The 515SDX includes a locking ON/OFF switch and an in-
ternal impedance selection socket mounted on the XLR con-
nector for switching between high and low impedance. A
slip-in swivel adapter is supplied for stand-mounted use.
Features
Rolled-off low-frequency response combined with a
smooth high-frequency rise for clear and intelligible
voice pickup
Symmetrical cardioid pickup pattern minimizes feed-
back
Neodymium magnet for high signal-to-noise ratio
Shock-mounted cartridge that minimizes handling noise
Lockable ON/OFF switch
Dual impedance selectable by internal socket
Slip-in swivel adapter for stand-mounted use
Three-pin professional audio connector, the industry
standard, for maximum interchangeability of cables
Tough, die-cast grille resists wear from constant use and
handling
Field serviceable and backed by the Shure 2-year
warranty
BASIC RULES FOR MICROPHONE USE
1. Aim a directional microphone toward the desired sound
source (for instance, a talker or singer) and away from
undesired sources (such as loudspeakers).
2. When extra bass response is desirable, work close to the
microphone. During closeup use, the low frequency out-
put will increase. This increase is called “proximity ef-
fect.” Refer to the frequency response curve (Figure 1).
3. Locate the microphone as close as practical to the de-
sired sound source to get the most gain before feedback.
4. Do not pick up the same sound source with more than
one microphone. Keep the distance between multiple
microphones at least three times the distance from each
source to its intended microphone.
5. Use the fewest number of microphones possible.
6. Locate microphones as far as possible from acoustically
reflective (hard or smooth) surfaces.
7. Add an external windscreen when additional pop
protection is needed (outdoors in windy conditions or
closeup vocal use, for example).
8. Avoid excessive handling of the microphone; doing so
will minimize mechanical noise pickup.
9. Keep the grille unobstructed; doing so will preserve the
microphone’s directional characteristics.
SPECIFICATIONS
Type
Dynamic
Frequency Response (Figure 1)
80 to 15,000 Hz
0.6 m
(2 ft)
1 cm
(
3
/
8
in.)
TYPICAL FREQUENCY RESPONSE
FIGURE 1
Polar Pattern (Figure 2)
Cardioid (unidirectional)
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
30
o
60
o
90
o
–5 dB
–10 dB
–15 dB
–20 dB
0
10000 Hz
6400 Hz
2500 Hz
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
30
o
60
o
90
o
–5 dB
–10 dB
–15 dB
–20 dB
0
1000 Hz
500 Hz
250 Hz
TYPICAL POLAR PATTERNS
FIGURE 2
Model 515SDX User Guide
27C2838 (Rev. 4)
2005, Shure Incorporated
Printed in U.S.A.