Shure 12A Manual Del Usuario

DESCRIPTION
The 12A microphone can be used for karaoke, for sound reinforcement
or recording, to pick up voices or instruments, indoors or outdoors.
Features
Tailored frequency response provides vocal intelligibility and crispness
Neodymium magnet for high signal-to-noise ratio
Cardioid (unidirectional) pickup pattern suppresses feedback
Locking On/Off switch
BASIC RULES FOR MICROPHONE USE
1. Aim a directional microphone toward the desired sound source (for
instance, talker, singer, musical instrument) and away from undesired
sources (such as loudspeakers or another instrument) [Figure 1].
2. Locate the microphone as close as practical to the desired sound
source.
3. Do not pick up the same sound source with more than one micro-
phone. Keep the distance between multiple microphones at least three
times the distance from each source to its intended microphone.
4. Use the fewest microphones practical for the particular application.
5. When extra bass response is desirable, work close to the microphone.
This phenomenon is known as "proximity effect".
6. Locate microphones as far as possible from acoustically reflective
(hard, smooth) surfaces.
7. Add an external windscreen when additional pop protection is needed:
outdoors in windy conditions or for closeup vocal use.
8. Avoid excessively handling the microphone to minimize mechanical
noise pickup.
9. To preserve directional characteristics, do not obstruct the grille with
your hand [Figure 2].
SPECIFICATIONS
Type
Dynamic
Frequency Response
80 to 14,000 Hz (see See Figure [3])
Pickup (Polar) Pattern
Cardioid (unidirectional) (see Figure [4])
2000, Shure Incorporated
27B3094 (TJ)
DO NOT OBSTRUCT GRILLE
WITH YOUR HAND
[2]
TO REDUCE FEEDBACK,
AIM MIC WITH CARDIOID
POLAR PATTERN
(SHADED) AWAY FROM
LOUDSPEAKERS
[1]
60 CM (2 FT)
MICROPHONE PICKUP
PATTERN (CARDIOID)
AMPLIFIER
Impedance (Z)
12A: Low, rated 150 Ω (actual 180 Ω ) 12AH: High 27k Ω
Output Level (at 1 kHz)
Open Circuit Voltage
12A: –56.0 dBV/Pa* (0.16 mV) 12AH: –37.0 dBV/Pa (1.4 mV)
*1 Pa = 94 dB SPL
Polarity
Positive pressure on diaphragm produces positive voltage on pin 2 with
respect to pin 3
Connector
Three-pin professional audio connector (male XLR)
Switch
Built–in locking On/Off switch, with lockplate. To lock switch On, loosen
screw, push lockplate forward, then tighten the screw.
Weight
265 g (9.4 oz)
Certifications
Conforms to European Union directives, eligible to bear CE marking; meets
European Union EMC Immunity Requirements (EN 50 082–1, 1992).
VARIATIONS
12A (Low Z) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12AM (Low Z) . . . . . . . . . . . . . . . . . . . . . . .
12AHM (High Z)
12AKW (Low Z)
OPTIONAL ACCESSORIES
4.57 m (15 ft.) Cable (XLR-
6.1 m (20 ft.) Cable (XLR-
7.6 m (25 ft.) Cable (XLR-XLR)
Windscreen (7 colors available)
REPLACEMENT PARTS
Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grille Assembly
For additional service or parts information, please contact Shure's
Service department at 1-800-516-2525. Outside the United States, please
contact your authorized Shure Service Center.
Patent No. Des. 397,119
Model 12A User Guide
TYPICAL FREQUENCY RESPONSE
[3]
o
150
o
120
500 Hz
o
90
1000 Hz
5000 Hz
o
60
o
30
PICKUP (POLAR) PATTERNS
Swivel Adapter, Storage Bag
. . . . . . . . . . . . . . . . . . . . . Swivel Adapter, Storage Bag
. . . . . 1/4"–XLR Cable, Anti-Roll Device, Storage Bag
1
/ in.) . . . . . . . . . . . . . . . . . . . . . . . . .
4
1
/ in.) . . . . . . . . . . . . . . . . . . . . . . . . . .
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
o
180
o
150
o
120
o
90
–20 dB
–15 dB
o
–10 dB 60
–5 dB
o
30
0
[4]
Microphone Only
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Printed in Mexico