U857AL
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
©2010 Audio-Technica U.S., Inc. audio-technica.com
0001-0126-01
Specifications
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.
Specifications are subject to change without notice.
dynamic range of 109 dB (phantom) or 99 dB (battery). Nominal open-
circuit output voltage shall be 7.9 mV (phantom) or 7.0 mV (battery) at 1 V,
1 Pascal. Output shall be low impedance balanced (200 ohms – phantom,
270 ohms – battery). It shall offer outstanding rejection of radio frequency
interference (RFI).
The microphone shall have a 3 m (9.8') permanently attached miniature
cable terminating in a special TA3F-type output connector designed to
optimize RFI immunity. The output connector shall connect to a TB3M-
type jack on the included power module. The power module shall house
the battery, and shall contain a switch that permits choice of off, on/flat
response or on/low-roll-off (80 Hz). The output of the power module shall
be a 3-pin XLRM-type connector.
A
5
/
8
"-27 threaded flange shall be provided for permanent installation to a
mounting surface. An included pass-through adapter shall provide a side-
exit for the cable. A two-stage foam windscreen shall also be included.
The microphone shall be a small-diameter alternating gooseneck design,
with an overall length of 421.0 mm (16.58") and a head diameter of 12.2
mm (0.48"). Weight shall be 131 grams (4.6 oz). Finish shall be low-
reflectance black.
The microphone shall also be available in a wireless model with a
0.75 m (29.5") permanently attached miniature cable terminated with
a locking 4-pin connector for use with Audio-Technica UniPak
®
body-
pack transmitters. The wireless model dimensions, RFI-immunity, polar
pattern, and included accessories (excluding power module and battery)
shall be identical to those of the wired model.
The Audio-Technica U857AL [U857ALcW-wireless] is specified.
LEGEND
200 Hz
1 kHz
5 kHz
8 kHz
SCALE IS 5 DECIBELS PER DIVISION
240˚
180˚
210˚
270˚
300˚
330˚
0˚
150˚
120˚
90˚
30˚
60˚
12" or more on axis
LEGEND
Frequency in Hertz
Response in dB
10 dB
100
50
200
10k
5k
1k
500
2k
20k
Roll-off
frequency response: 30–20,000 Hz
polar pattern
Fixed-charge back plate, permanently
polarized condenser
Cardioid
30-20,000 Hz
80 Hz, 18 dB/octave
Phantom: –42 dB (7.9 mV) re 1V at 1 Pa
Battery: –43 dB (7.0 mV) re 1V at 1 Pa
Phantom: 200 ohms; Battery: 270 ohms
Phantom: 133 dB SPL, 1 kHz at 1% T.H.D.
Battery: 123 dB SPL, 1 kHz at 1% T.H.D.
Phantom: 109 dB, 1 kHz at Max SPL
Battery: 99 dB, 1 kHz at Max SPL
70 dB, 1 kHz at 1 Pa
11-52V DC, 2 mA typical
1.5V AA/UM3
0.4 mA / 1200 hours typical (alkaline)
Off, on-flat, on-roll-off
Microphone: 131 g (4.6 oz)
Power module: 139 g (4.9 oz)
Microphone: 421.0 mm (16.58") long,
12.2 mm (0.48") head diameter
Power module: 84.0 mm (3.31") H x
63.0 mm (2.48") W x 22.0 mm (0.87") D
Power module: Integral 3-pin XLRM-type
3.0 m (9.8') long (permanently attached
to microphone), 3.2 mm (0.13") diameter,
2-conductor shielded cable with TA3F-
type connector
UE-O omnidirectional (360°)
UE-H hypercardioid (100°)
UE-UL UniLine
®
(90°)
M2
AT8531 power module; AT8663 A-mount
flange; AT8664 A-mount cable pass-
through adapter; AT8153 two-stage foam
windscreen; battery
Element
Polar pattern
Frequency response
Low frequency roll-off
Open circuit sensitivity
Impedance
Maximum input sound level
Dynamic range (typical)
Signal-to-noise ratio
1
Phantom power requirements
Battery type
Battery current / life
Switch
Weight
Dimensions
Output connector
Cable
Optional interchangeable elements
Audio-Technica case style
Accessories furnished
273
