PRO45 and PRO45W

REMOTE-POWERED
CARDIOID CONDENSER
HANGING MICROPHONES

The microphone element is enclosed in a DC phantom power (9-52 volts) must be

rugged housing with a low-reflectance black applied equally to Pins 2 and 3, with the ground
finish. The microphone is also available in for the power supply connected to Pin 1. This
white as the PRO 45W, with a white-finished can be provided by a console or mixer with
microphone housing, windscreen, cable and built-in phantom voltage or with the addition
steel hanger, for applications where the of an in-line phantom power supply, such as
microphone must be hung against a light the recommended Audio-Technica CP8506
background. and AT8801 power supplies.
Operation and Maintenance If an extension cable is necessary, AT8314
The PRO 45 is ideal for suspension over cable (or equal) should be used. Regardless
choirs, instrumental groups or theater stages. of cables used, it is important that both ends
A uniform 120° angle of acceptance provides of each cable are wired consistently, with the
well-balanced audio pickup. The microphone shield always connected to Pin 1 at both
should be located forward of the front-most ends, Pin 2 connected to Pin 2, and Pin 3 to
source, above the rear-most source, and Pin 3. This will ensure that all microphones are
“aimed” between them (Fig. 1). Increasing the electrically in phase and reduce problems of
height of the mic above the sources will tend uneven response and sound cancellation
to equalize sound levels between them, but when two microphones are used close to each
may also increase background/reverberant other.
sound pickup. Whenever possible, the distance The high sensitivity of the PRO 45 ensures
from the mic to the rear-most pickup should useful output and an excellent match to most
be no more than twice the distance to the mixer, tape recorder and amplifier inputs. It
front source, to maintain front-to-rear balance will provide undistorted output even in sound
(Fig. 1). fields as loud as 134 dB SPL. However, due
to the high sensitivity, in some instances it
LESS THAN
2 TIMES “X”
may be possible to overload sensitive input
DI
ST
AN
CE
stages. If distortion occurs, first check for
“X
” input overload. In such cases, an attenuator
such as the Audio-Technica AT8202 may be
Description 120°
ANGLE OF
120° 120° required between the mic and the electronics
ACCEPTANCE
input. (Also, many mixers provide “input pad”
The PRO 45 is a wide-range condenser micro- MIC A MIC B
3 TIMES
DISTANCE “X” switches to reduce mic-input signal levels.)
phone with a cardioid (unidirectional) polar
pattern. It was designed for high-quality sound Fig. 1 Fig. 2 While a modern condenser microphone is not
reinforcement and other demanding sound unduly sensitive to the environment, tempera-
pickup applications. The PRO 45 is furnished Width of pickup is approximately three times ture extremes can be harmful. Exposure to
with a vinyl-coated steel hanger that allows it the distance to the closest performer. If addi- high temperatures can result in gradual and
to be positioned inconspicuously over a choir, tional mics are needed for wide sources, they permanent reduction of the output level. Avoid
orchestra, stage, etc., for low-profile situations. should not be closer together laterally than leaving the microphone in the open sun or in
three times the distance to the front source, areas where temperatures exceed 110° F
The PRO 45 features a 25' (7.6 m) perma- to avoid phase cancellation (Fig. 2). (43° C) for long periods of time. Extremely
nently-attached miniature cable with an
To orient in the proper direction, twist the high humidity should also be avoided.
XLRM-type connector, which allows it to be
plugged directly into an XLRF-type jack or microphone housing slightly in its wire holder
cable connector. The unit’s integral electronics (clockwise rotation moves the microphone to
can be powered from any external 9V to 52V the right; counterclockwise rotation moves it Frequency Response
DC phantom power source. to the left). The provided AT8146 windscreen
simply slips over the head of the microphone,
Audio-Technica design engineers have utilized effectively reducing noise from wind or venti-
Response in dB

the newest low-mass technology in the quest lation air currents. 10 dB

for superior performance. The charge is now on
the fixed back plate, rather than the moving Output is low impedance balanced. The output
element. With the A-T fixed-charge “back plate” connector mates with XLRF-type connectors.
construction, a gold-vaporized diaphragm just The balanced signal appears across Pins 2 50 100 200 500 1k
Frequency in Hertz
2k 5k 10k 20k

2 microns thick (about 0.000079") can be and 3, while the ground (shield) connection is LEGEND 12" or more on axis

used. This reduces moving mass substantially, Pin 1. Output is phased so that positive
improving frequency response and transient acoustic pressure produces positive voltage at
response while reducing distortion. Pin 2 in accordance with industry convention.
PRO45 and PRO45W
Polar Pattern PRO 45/PRO 45W SPECIFICATIONS†
0
Element ..................................................... Fixed-charge back plate
permanently polarized condenser
330 30
Polar Pattern ............................................. Cardioid (Unidirectional)
Frequency Response .............................. 70-16,000 Hz
300 60
Open Circuit Sensitivity .......................... –37 dB (14.1 mV) re 1V at 1 Pa*
Impedance ................................................ 100 ohms
Maximum Input Sound Level .................. 134 dB SPL, 1 kHz at 1% T.H.D.
270 90
Signal-to-noise Ratio1 .............................. 66 dB, 1 kHz at 1 Pa*
Dynamic Range (Typical) ......................... 106 dB, 1 kHz at Max SPL
Phantom Power Requirements ............... 9-52V DC, 2 mA typical
240 120 Weight (less cable) .................................... 0.5 oz (15 grams)
Dimensions .............................................. 2.24" (56.9 mm) long,
210 150
0.47" (12.0 mm) head diameter
180
Output Connector ..................................... 3-pin XLRM-type
SCALE IS 5 DECIBELS PER DIVISION Cable ......................................................... 25' (7.6 m) long (permanently attached
LEGEND to microphone), 0.10" (2.6 mm) diameter,
200 Hz
1 kHz
2-conductor, shielded cable
5 kHz
8 kHz Accessories Furnished .......................... Foam windscreen, steel hanger
† 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
1
Typical, A-weighted, using Audio Precision System One

Dimensions Optional Accessories:

AT8104a large metal windscreen.
25 2.68" AT8117 large foam windscreen for
7.6 m 68.0 mm
high-wind conditions.
0.47" 2.24" 0.10" 0.75"
12.0 mm 56.9 mm 2.6 mm 19.0 mm CP8201 line matching transformer
(Lo-Z to 50,000 ohms).
AT8202 adjustable in-line attenuator for use
with balanced Lo-Z microphones.
AT8314 2-conductor, shielded, vinyl-jacketed,
broadcast-type cable with XLRF-type connector
at microphone end, XLRM-type connector at
equipment end. Available in 10', 20', 25', 30', 50'
& 100' lengths.
CP8506 four-channel 48V phantom power
supply (AC powered).
AT8801 single-channel 48V phantom power
supply (AC powered).

One-Year Limited Warranty

Audio-Technica microphones and accessories purchased in
the U.S.A. are warranted for one year from date of purchase
by Audio-Technica U.S., Inc. (A.T.U.S.) to be free of defects in
materials and workmanship. In event of such defect, product
will be repaired promptly without charge or, at our option,
replaced with a new product of equal or superior value if
delivered to A.T.U.S. or an Authorized Service Center,
prepaid, together with the sales slip or other proof of purchase
date. Prior approval from A.T.U.S. is required for return.
This warranty excludes defects due to normal wear, abuse,
shipping damage, or failure to use product in accordance with
instructions. This warranty is void in the event of unauthorized
repair or modification.
For return approval and shipping information, contact
the Ser vice Depar tment, Audio-Technica U.S., Inc.,
1221 Commerce Drive, Stow, Ohio 44224.
Except to the extent precluded by applicable state law,
A.T.U.S. will have no liability for any consequential,
incidental, or special damages; any warranty of mer-
chantability or fitness for particular purpose expires
when this warranty expires.
This warranty gives you specific legal rights, and you may
have other rights which vary from state to state.

Outside the U.S.A., please contact your local dealer for

warranty details.

Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224

Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
Form No. 0320-0805-02-B/W © 1999 Audio-Technica U.S., Inc. Printed in U.S.A.