Audio-Technica PRO45W, PRO45 User Manual

PRO45 and PRO45W

REMOTE-POWERED CARDIOID CONDENSER HANGING MICROPHONES

Frequency Response

The microphone element is enclosed in a rugged housing with a low-reflectance black finish. The microphone is also available in white as the PRO 45W, with a white-finished microphone housing, windscreen, cable and steel hanger, for applications where the microphone must be hung against a light background.

Operation and Maintenance

The PRO 45 is ideal for suspension over choirs, instrumental groups or theater stages. 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. Whenever 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 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). The provided AT8146 windscreen simply slips over the head of the microphone, effectively reducing noise from wind or ventilation air currents.

Output is low impedance balanced. The output connector mates with XLRF-type connectors. The balanced 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.

If an extension cable is necessary, AT8314 cable (or equal) should be used. Regardless of cables used, it is important that both ends of each cable are wired consistently, with the shield always connected to Pin 1 at both ends, Pin 2 connected to Pin 2, and Pin 3 to Pin 3.This will ensure that all microphones are electrically in phase and reduce problems of uneven response and sound cancellation when two microphones are used close to each other.

The high sensitivity of the PRO45 ensures useful output and an excellent match to most mixer, tape recorder and amplifier inputs. It will provide undistorted output even in sound fields as loud as 134 dB SPL. However, due to the high sensitivity, in some instances it may be possible to over load 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, temperature 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.

Description

The PRO45 is a wide-range condenser microphone with a cardioid (unidirectional) polar pattern. It was designed for high-quality sound reinforcement and other demanding sound pickup applications. The PRO 45 is furnished with a vinyl-coated steel hanger that allows it to be positioned inconspicuously over a choir, orchestra, stage, etc., for low-profile situations.

The PRO 45 features a 25' (7.6 m) per manently-attached miniature cable with an XLRM-type connector, which allows it to be plugged directly into an XLRF-type jack or cable connector.The unit’s integral electronics can be powered from any external 9V to 52V DC phantom power source.

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.

LESS THAN 2 TIMES “X”

DISTANCE “X”

120° ANGLE OF ACCEPTANCE

MIC A MIC B

3 TIMES

DISTANCE “X”

120°120

Fig. 1 Fig. 2

200100

Frequency in Hertz

12" or more on axis

500

10k

20k

LEGEND

10 dB

Response in dB

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 Service Department, 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 merchantability 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.

PRO45 and PRO45W

200 Hz

1 kHz 5 kHz 8 kHz

LEGEND

SCALE IS 5 DECIBELS PER DIVISION

120

150

210

240

270

300

330

180

PRO 45/PRO45W SPECIFICATIONS

†

Element ..................................................... Fixed-charge back plate

permanently polarized condenser

Polar Pattern ............................................. Cardioid (Unidirectional)

Frequency Response .............................. 70-16,000 Hz

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.

Signal-to-noise Ratio

.............................. 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

Weight (less cable) .................................... 0.5 oz (15 grams)

Dimensions .............................................. 2.24" (56.9 mm) long,

0.47" (12.0 mm) head diameter

Output Connector..................................... 3-pin XLRM-type

Cable ......................................................... 25' (7.6 m) long (permanently attached

to microphone), 0.10" (2.6 mm) diameter, 2-conductor, shielded cable

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

= 10 microbars = 94 dB SPL

Typical, A-weighted, using Audio Precision System One

Optional Accessories:

AT8104a large metal windscreen. AT8117 large foam windscreen for

high-wind conditions. 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).

Polar Pattern

Dimensions

0.47"

12.0 mm

7.6 m

68.0 mm

2.68"

0.75"

19.0 mm

2.24"

56.9 mm

2.6 mm

0.10"

Audio-Technica U.S.,Inc., 1221 Commerce Drive, Stow, Ohio 44224 Audio-Technica Limited, Old Lane, Leeds LS11 8AG England