Audio Technica UniPoint AT857AMa Product Information
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Description
The AT857AMa is a wide-range condenser microphone designed for quality sound reinforcement, professional recording, television, and other demanding sound pickup applications.
Standing 12.21" above the mounting surface, its small-diameter alternating gooseneck design permits highly flexible positioning while maintaining a smooth, well-contoured appearance. The AT857AMLa is a 19" version of this microphone.
Supplied as a cardioid, the AT857AMa easily accepts interchangeable elements to permit selection of angle of acceptance from 100° to
360°. The following optional elements are available from an authorized Audio-Technica dealer or the A -T service department:
AT853H-ELE hypercardioid, AT853O-ELE omnidirectional, AT853SC-ELE subcardioid.
The microphone features a 9.8' (3.0 m) permanently-attached miniature cable with a
3-pin TA3F output connector. It can be powered from an external 9V to 52V DC phantom power supply or from a 1.5V AA battery.
Current demands are so low that a premium battery will provide about 1200 hours of continuous use. A built-in 3-position switch on the power module allows selection of off, on/flat response or on/low-roll-off.
Audio -Technica design engineers have utilized the newest low-mass technology in the quest for superior performance. The permanent charge is now on the fixed back plate, rather than the moving element. With
A-T fixed charge “back plate” construction, a gold-vaporized diaphragm just 2 microns thick (or about 0.000079") can be used. This reduces moving mass, thus improving frequency response and transient response while reducing distortion.
The microphone element is enclosed in a rugged housing with a low-reflectance black finish. A 5 /
8
"-27 threaded flange allows the microphone to mate with the threads of a standard microphone desk or floor stand. A
5 /
8
"-27 threaded stud is also provided so it can be secured to a permanent mounting surface.
Installation and Operation
To install the battery, remove the cap from the top of the power module. Insert the battery, being certain to observe battery polarity as marked (+ end toward the cap release button). For longest battery life, the switch should remain off except when the microphone is in use. While standard carbonzinc AA batteries will operate the microphone satisfactorily, alkaline or mercury cells are preferred for longer service life. Only
“leakproof” batteries should be used. The battery does not have to be in place to use in phantom power mode. Phantom power requires 9V to 52V DC.
Output is low impedance balanced. The output connector of the power module mates with XLRF-type cable 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.
The AT8102 two-stage foam windscreen simply slips over the head of the microphone, effectively reducing wind noise or
“popping” when used extra close.
The small-diameter gooseneck is easy to manipulate for proper positioning. Heavily lubricated, it operates smoothly and quietly.
Should the unit become noisy with prolonged use, apply a light machine oil directly on the gooseneck area affected.
While a modern condenser microphone is not unduly sensitive to the environment, temperature extremes can be harmful. 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.
Architects and Engineers Specifications
The microphone shall be a fixed-charge condenser with a cardioid polar pattern and a frequency response of 30 Hz to 20,000 Hz. It shall be capable of accepting optional interchangeable elements for additional polar patterns. It shall operate from an external 9V to 52V DC phantom power source or, alternatively, from a 1.5V AA/UM3 battery. Nominal open-circuit output voltage shall be 6.3 mV
(phantom) or 5.6 mV (battery) at 1 kHz, 1
Pascal. Output shall be low impedance balanced (200 ohms-phantom, 270 ohmsbattery).
The microphone shall have a permanentlyattached 9.8' (3.0 m) miniature cable, terminating in a TA3F output connector. The output connector shall connect to a TB3M jack on a power module. The included power module shall house the battery, and contain an off/on/low-roll-off switch. The power module shall terminate in a 3-pin XLRM-type connector.
The microphone shall be a small-diameter alternating gooseneck design, with 12.21"
(310.2 mm) [19.00" (482.5 mm)] overall length.
Head diameter shall be 0.47" (12.0 mm). The microphone shall include a 5 /
8
"-27 threaded flange to mate with the threads of a standard microphone desk or floor stand. A 5 /
8
"-27 threaded stud shall be provided for permanent installation to a mounting surface. The microphone weight shall be 3.6 oz (103 grams) [4.6 oz (131 grams)], without cable.
Finish shall be low-reflectance black.
The Audio-Technica AT857AMa [AT857AMLa] is specified.
Frequency Response
AT857AMa
AT857AMLa
CARDIOID
CONDENSER
ADAPTER-
MOUNT
GOOSENECK
MICROPHONES
LEGEND
50 100 200 500 1k
Frequency in Hertz
12" or more on axis (flat)
Roll-off
2k 5k 10k 20k
10 dB
AT857AMa
AT857AMLa
270
300
330
Polar Pattern
0
30
240
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
210 150
180
SCALE IS 5 DECIBELS PER DIVISION
120
AT857AMa
Dimensions
0.47"
12.0 mm
1.39"
35.2 mm
12.21"
310.2 mm
AT857AMLa
Dimensions
0.47"
12.0 mm
1.39"
35.2 mm
60
90
19.00"
482.5 mm
AT857AMa/AT857AMLa
SPECIFICATIONS
†
ELEMENT Fixed-charge back plate permanently polarized condenser
POLAR PATTERN
FREQUENCY RESPONSE
Cardioid (Unidirectional)
30 -20,000 Hz
LOW-FREQUENCY ROLL-OFF
OPEN CIRCUIT SENSITIVITY
IMPEDANCE PHANTOM
BATTERY
MAXIMUM INPUT SOUND LEVEL PHANTOM
BATTERY
DYNAMIC RANGE (TYPICAL)
PHANTOM
BATTERY
PHANTOM
BATTERY
SIGNAL-TO-NOISE RATIO 1
SWITCH
80 Hz, 18 dB/octave
–44 dB (6.3 mV) re 1V at 1 Pa*
–45 dB (5.6 mV) re 1V at 1 Pa*
200 ohms
270 ohms
135 dB SPL, 1 kHz at 1% T.H.D.
121 dB SPL, 1 kHz at 1% T.H.D.
108 dB, 1 kHz at Max SPL
94 dB, 1 kHz at Max SPL
BATTERY TYPE
BATTERY CURRENT
BATTERY LIFE
PHANTOM POWER REQUIREMENTS
WEIGHT
DIMENSIONS
MICROPHONE
POWER MODULE
MICROPHONE
POWER MODULE
67 dB, 1 kHz at 1 Pa*
Off, on-flat, on-roll-off
Use only “leakproof” AA/UM3 1.5V battery
0.4 mA typical
1200 hours (alkaline battery)
9 -52V DC, 2 mA typical
(AT857AMa) 3.6 oz (103 grams)
(AT857AMLa) 4.6 oz (131 grams)
5.2 oz (147 grams)
(AT857AMa) 12.21" (310.2 mm) long above mounting surface
(AT857AMLa) 19.00" (482.5 mm) long above mounting surface
(BOTH) 0.47" (12.0 mm) head diameter
3.27" (83.0 mm) H x 2.48" (63.0 mm) W x
0.87" (22.0 mm) D
OUTPUT CONNECTOR (POWER MODULE)
CABLE
ACCESSORIES FURNISHED
OPTIONAL INTERCHANGEABLE ELEMENTS
Integral 3-pin XLRM-type
9.8' (3.0 m) long (permanently attached to microphone), 0.10" (2.6 mm) diameter,
2-conductor, shielded cable with TA3F output connector that mates with TB3M jack on power module
AT8102 two-stage foam windscreen;
AT8531 power module; battery;
AT8425 5 /
8
"-27 threaded mounting stud
AT853H-ELE hypercardioid (100°)
AT853O-ELE omnidirectional (360°)
AT853SC-ELE subcardioid (170°)
AT8531 Power Module
† 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.
0.87"
22.0 mm
2.48"
63.0 mm
Push Button
To Release Cap
POWER MODULE
AT8531 audio-technica
MADE IN JAPAN
3.27"
83.0 mm
SWITCH
Roll-off
Flat
Off
PUSH
OFF
Optional Accessories:
• AT8104a metal lockable windscreen.
• AT8117 large foam windscreen.
• 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.
• AT8416 shock mount.
• CP8201 line matching transformer
(Lo-Z to 50,000 ohms).
• CP8506 four-channel 48V phantom power supply (AC powered).
• AT8801 single-channel 48V phantom power supply (AC powered).
1.18"
30.0 mm
0.10"
2.6 mm
0.42"
10.5 mm
1.18"
30.0 mm
0.10"
2.6 mm
0.42"
10.5 mm
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.
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
Form No. 0310-0793-08-B/W P50876-01 © 1998 Audio-Technica U.S., Inc. Printed in U.S.A.

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