Audio Technica PRO 45 Specifications

PRO 45 & PRO 45W
Cardioid Condenser Hanging Microphones
Features
• Wide-range condenser element with low-mass diaphragm for
superior performance
• Cardioid polar pattern with 120º acceptance angle
• Self-contained electronics eliminate need for external power
modules
• Flat, smooth frequency response
• Steel hanger positions microphone over choirs, instrumental
groups and theater stages
• Available in two colors: black (PRO 45) and white (PRO 45W)
Description
The PRO 45 is a wide-range minature condenser microphone with a
cardioid polar pattern. It is ideal for suspension over choirs, instrumental
groups or theater stages.
The microphone requires 9V to 52V phantom power for operation.
The microphone's cardioid polar pattern provides a 120° angle of
acceptance.
The microphone includes a 7 .6 m (25') permanently attached miniature
cable with an XLRM-type connector, which allows it to be plugged
directly into an XLRF-type jack or cable connector.
The microphone comes equipped with a vinyl-coated steel hanger for
positioning over a choir/orchestra/stage. A foam windscreen is also
included.
The microphone is enclosed in a rugged housing with a low-reflectance
black finish. It is also available with white housing, cable, hanger and
windscreen as the PRO 45W.
Installation and Operation
The PRO 45 requires 9V to 52V phantom power for operation.
A uniform 120° angle of acceptance provides well-balanced audio
pickup. The microphone should be located forward of the front-most
source, above the rear-most source, and "aimed" between them (Fig.
1). Increasing the height of the mic above the sources will tend to
equalize sound levels between them, but may also increase background/
reverberant sound pickup. When possible, the distance from the mic to
the rear-most pickup should be no more than twice the distance to the
front source, to maintain front-to-rear balance (Fig. 1).
Width of pickup is approximately three times the distance to the closest
performer. If additional mics are needed for wide sources, they should
not be closer together laterally than three times the distance to the front
source, to avoid phase cancellation (Fig. 2).
To orient the microphone in the proper direction, twist the microphone
housing slightly in its wire holder (clockwise rotation moves the
microphone to the right; counterclockwise rotation moves it to the left).
Output 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.
The provided windscreen simply slips over the head of the microphone,
effectively reducing noise from wind or ventilation air currents.
Avoid leaving the microphone in the open sun or in areas where
temperatures exceed 110° F (43° C) for long periods of time. Extremely
high humidity should also be avoided.
Architect's and Engineer's Specifications
The microphone shall be a fixed-charge condenser designed for
permanent installation or portable applications. It shall have a cardioid
polar pattern with a uniform 120° angle of acceptance and a frequency
response of 70 Hz to 16,000 Hz. The microphone shall operate from
an external 9V to 52V DC phantom power source. It shall be capable
of handling sound input levels up to 134 dB with a dynamic range of
106 dB. Nominal open-circuit output voltage shall be 14.1 mV at 1V, 1
Pascal. Output shall be low impedance balanced (100 ohms).
The microphone shall incorporate self-contained electronics, eliminating the
need for an external power module. The microphone shall have a 7 .6 m (25')
permanently attached miniature cable with a 3-pin XLRM-type connector for
direct connection to a mating XLRF-type jack or cable connector.
An adjustable steel wire hanger shall be provided for suspended
installations. The steel wire hanger shall attach to the microphone body
and allow for the positioning of the microphone without the need for
tools. A foam windscreen shall also be included.
The microphone shall be a hanging design, with an overall length of
56.9 mm (2.24") and a head diameter of 12.0 mm (0.47"). Weight shall
be 15 grams (0.5 oz) without cable. The microphone, cable and steel
hanger shall be black [white].
The Audio-Technica PRO 45 [PRO 45W] is specified.
120°
ANGLE OF
ACCEPTANCE
Figure 1
propoint microphones
®
120° 120°
MIC A MIC B
3 TIMES
DISTANCE "X"
Figure 2