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PRO 31
CARDIOID DYNAMIC MICROPHONE
• Designed for close-up vocal use
• Silent on-off operation thanks to MagnaLock
• Hi-ENERGY
®
neodymium magnet for improved output and
transient response
• Two-stage ball-type screen reduces wind noise and "popping"
during close use
• Corrosion-resistant contacts from gold-plated XLRM-type
connectors
• Rugged design and construction for reliable performance
• Cardioid polar pattern reduces pickup of sounds from the sides
and rear, improving isolation of desired sound source
Output from the microphone's XLRM-type connector is low
impedance (Lo-Z) balanced. The signal appears across Pins 2 and 3;
Pin 1 is ground (shield). Output phase is "Pin 2 hot" – positive
acoustic pressure produces positive voltage at Pin 2.
Plug Type
Ground
XLR
Pin 1
/
" "TRS"
Sleeve
1
4
1
/
"
Sleeve
4
To avoid phase cancellation and poor sound, all mic cables must be
wired consistently: Pin 1-to-Pin 1, etc. For a high-impedance (Hi-Z)
mic input, connect a Lo-Z balanced cable to a Hi-Z matching
transformer (A-T CP8201 or equal) at the equipment input.
When using the PRO 31 in settings with a stage monitor speaker,
the speaker should be located 180° off axis (at the rear of the
microphone). This placement, in conjunction with the microphone's
uniform cardioid pickup pattern, will virtually eliminate the possibility
of undesired audio feedback.
The PRO 31 utilizes a MagnaLock on/off switch. This specially
designed switch operates silently and may be locked in the "on"
position to prevent accidental turn-off during use. To lock, slide the
switch up into the "on" position (Fig. 1a). Using a small flat-head
screwdriver, rotate the small screw in the center of the switch 90
degrees (
1
/
turn) counter-clockwise (Fig. 1b). Never force the screw.
4
When the screw slot position is horizontal ("across" the microphone
body), the switch is locked. To unlock the switch, turn the screw 90
degrees clockwise until the screw slot position is again vertical (in
line with the microphone body). Never try to turn the switch more
than 90 degrees or
1
/
rotation. The switch may only be locked in the
4
"on" position. Do not try to turn the screw when the switch is in the
"off " position.
Take care to keep foreign particles from entering the windscreen. An
accumulation of iron or steel filings on the diaphragm, and/or
foreign material in the windscreen's mesh surface, can degrade
performance.
™
switch design
Audio "+"
Audio "–"
Pin 2
Pin 3
Tip
Ring
Tip
Sleeve
PRO 31 SPECIFICATIONS
†
ELEMENT
POLAR PATTERN
FREQUENCY RESPONSE
OPEN CIRCUIT SENSITIVITY
IMPEDANCE
SWITCH
WEIGHT (less cable and accessories)
DIMENSIONS
OUTPUT CONNECTOR
CABLE
ACCESSORIES FURNISHED
† In the interest of standards development, A.T .U.S. offers full details on its test
methods to other industry professionals on request.
*1 Pascal = 10 dynes /cm
2
= 10 microbars = 94 dB SPL
Specifications are subject to change without notice.
Polar Pattern
0
330
30
300
60
270
90
240
120
50
100
210
150
180
LEGEND
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
Unlocked
Locked
Position
Position
O N
O N
Fig. 1a
Fig. 1b
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P3893-00180
P51677-EN
©2004 Audio-Technica U.S., Inc.
Dynamic
Cardioid
60-13,000 Hz
–55 dB (1.7 mV) re 1V at 1 Pa*
600 ohms
MagnaLock
™
on/off
11.0 oz (312 g)
7.28" (185.0 mm) long,
2.09" (53.1 mm) head diameter
Integral 3-pin XLRM-type
15.0' (4.5 m) cable with XLRF-type
connector at microphone end,
XLRM-type connector at equipment
end
AT8470 Quiet-Flex
™
stand clamp for
/
"-27 threaded stands;
5
8
5
/
"-27 to
3
/
"-16 threaded adapter;
8
8
soft protective pouch
Frequency Response
200
500
1k
2k
5k
10k
20k
Frequency in Hertz
12" or more on axis
s
Do not try
Do not turn
to lock switch
screw clockwise
in the "off "
to lock
position
O FF
O N
Fig.1c
Fig. 1d
Printed in Taiwan
10 dB
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