Audio-Technica PRO44 Manual

Audio-Technica Mikrofon PRO44

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PRO

CARDIOID UNIDIRECTIONAL

BOUNDARY MICROPHONE

Frequency in Hertz

Response in dB

10 dB

20k10k5k2k1k50020010050

LEGEND 12" or more on axis

Frequency Response

Operation and Maintenance

The symmetry and area of the mounting

surface directly affect the sensitivity of the

boundary microphone at low frequencies.

Ideally, the mounting surface should be circu-

lar; however, square or rectangular surfaces

are most often used. If the mounting surface

is rectangular, the smaller dimension tends to

determine low-frequency cutoff. The micro-

phone should be centered on the surface and

positioned with the front of the microphone

facing the sound source along the longer

dimension of the mounting surface. The

sound source should not be below, or higher

than 60° above, the plane of the mounting

surface.

Output is low impedance balanced. The bal-

anced signal appears across Pins 2 and 3,

while the ground (shield) connection

is Pin 1. Output is phased so that positive

acoustic pressure produces positive voltage at

Pin 2 in accordance with industry convention.

DC phantom power (9-52 volts) must be

applied equally to Pins 2 and 3, with the

ground for the power supply connected to

Pin 1. This can be provided by a console or

mixer with built-in phantom voltage or with the

addition of an in-line phantom power supply,

such as the recommended Audio-Technica

CP8506 and AT8801 power supplies.

Description

The PRO 44 is a wide-range condenser

microphone with a hemi-cardioid (half-space

cardioid) polar pattern. It was designed for

surface-mounted applications in high-quality

sound reinforcement and other demanding

sound pickup situations. Its low-prole design

makes the PRO 44 ideal for use in applica-

tions where minimum visibility is required.

The PRO44 can be powered from any external

9V to 52V DC phantom power source. A

25' (7.6 m) cable with TA3F and XLRM-type

connectors is provided for use between the

microphone and electronics input.

Audio-Technica design engineers have utilized

the newest low-mass technology in the quest

for superior performance. The charge is now on

the fixed back plate, rather than the moving

element. With the A-T fixed-charge “back plate”

construction, a gold-vaporized diaphragm just

2 microns thick (about 0.000079") can be used.

This reduces moving mass substantially,

improving frequency response and transient

response while reducing distortion.

Positioning a properly designed miniature

unidirectional microphone centrally on a large,

flat, unobstructed surface yields several dis-

tinct advantages. Directionality is increased

by 3 dB, promoting enhanced gain before

feedback and further suppression of ambient

noise. Sensitivity is increased for improved

signal-to-noise ratio. Phase distortion due to

reflected sound energy from the boundary

itself is eliminated.

The microphone element is enclosed in a

rugged housing with a black finish. The rubber

non-slip bottom pad minimizes mechanical

coupling of surface vibrations to the micro-

phone.

The high sensitivity of the PRO44 ensures

useful output and an excellent match to most

mixer, tape recorder and amplifier inputs. It

will provide undistorted output even in sound

elds as loud as 114 dB SPL. However, due

to the high sensitivity, in some instances it

may be possible to overload sensitive input

stages. If distortion occurs,

first

check for

input

overload. In such cases, an attenuator

such as the Audio-Technica AT8202 may be

required between the mic and the electronics

input. (Also, many mixers provide “input pad”

switches to reduce mic-input signal levels.)

While a modern condenser microphone is not

unduly sensitive to the environment, tempera-

ture extremes can be harmful. Exposure to

high temperatures can result in gradual and

permanent reduction of the output level. 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.

60°

IDEAL

WORKING

ANGLE

Produkt Specifikationer

Mærke:	Audio-Technica
Kategori:	Mikrofon
Model:	PRO44
Vægt:	67 g
Forbindelsesteknologi:	Ledningsført
Kabellængde:	7.6 m
Driftsspænding:	9 V
Mikrofonindgangsimpedans:	100 ohm (Ω)
Mikrofon frekvens:	70 - 16000 Hz
Strømforbrug:	2 mA
Mikrofon sensitivitet:	25 dB
Kabeltype:	TA3F, XLRM