Audio-Technica U857AU User Manual
8 kHz
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz
F
requency in Hertz
LEGEND
12" or more on axis
Roll-off
Frequency Response
Response in dB
U857AU UNILINE
™
CONDENSER GOOSENECK MICROPHONE
• Designed for high-quality
sound reinforcement,
professional recording and
broadcasting
• UniLine
™
polar pattern
provides narrow 90°
acceptance angle
• Superior off-axis rejection for
maximum gain before
feedback
™
• UniGuard
RFI-shielding
technology offers outstanding
rejection of radio frequency
interference (RFI)
• Easy-to-adjust, rugged,
small-diameter, alternating
gooseneck with virtually no
“memory” permits quick
positioning into desired shape
• UniSteep
®
filter provides a
steep low-frequency
attenuation to improve sound
pickup without affecting voice
quality
• Accepts interchangeable elements to permit angle of acceptance
from 90º to 360º
• Two-stage foam windscreen yields dramatically improved
resistance to P-pops and other breath blasts
• Direct mounts to any
5
/8"-27 stand, or to included threaded
mounting flange
• Operates on battery or phantom power
The U857AU requires 11-52V DC phantom power or a 1.5V AA
battery for operation. A battery need not be in place for phantom
wer operation.
po
Battery installation: Remove the cap from the top of the power
module. Insert a fresh 1.5V AA battery (“+” end toward the cap
release button), then reassemble the power module. Alkaline
batteries are recommended for longest life. Remove the battery
during long-term storage.
Output from the power module’s XLRM-type connector 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.
An integral 80 Hz high-pass UniSteep
®
filter provides easy
switching from a flat frequency response to a low-end roll-off. The
roll-off position reduces the microphone’s sensitivity to popping
in close vocal use. It also reduces the pickup of low-frequency
ambient noise (such as traffic, air-handling systems, etc.), room
reverberation and mechanically coupled vibrations.
U SPECIFICATIONS†
U857A
ELEMENT
POLAR P
FREQ
LO
ATTERN
UENCY RESPONSE
W FREQUENCY ROLL-OFF
Fixed-charge back plate
manently polarized condenser
per
Line Cardioid
30-20,000 Hz
80 Hz, 18 dB/octa
ve
OPEN CIRCUIT SENSITIVITY –38 dB (12.5 mV) /
(Phantom / Batter
ANCE
IMPED
y) –39 dB (11.2 mV) re 1V at 1 Pa*
(Phantom / Batter
y) 200 ohms / 270 ohms
MAXIMUM INPUT SOUND LEVEL 130 dB / 120 dB SPL,
(Phantom / Batter
y) 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical) 110 dB / 100 dB,
(Phantom / Batter
SIGNAL-T
OM POWER REQUIREMENTS
PHANT
ATTERY TYPE
B
y) 1 kHz at Max SPL
O-NOISE RATIO
1
74 dB
11-52V DC
1.5V AA/UM3
, 1 kHz at 1 Pa*
, 2 mA typical
BATTERY CURRENT/LIFE 0.4 mA / 1200 hours typical
(alkaline)
SWITCH Off
, on-flat, on-roll-off
WEIGHT
OPHONE
MICR
WER MODULE
PO
5.0 oz (141 g)
4.9 oz (139 g)
DIMENSIONS
OPHONE
MICR
16.81" (427.0 mm) long,
0.48" (12.2 mm) head diameter
WER MODULE
PO
3.31" (84.0 mm) H x
2.48" (63.0 mm)
W x
0.87" (22.0 mm) D
OUTPUT CONNECTOR Integral 3-pin XLRM-type
(power module)
CABLE 9.8' (3.0 m) long (per
manently
attached to microphone), 0.13"
(3.2 mm) diameter
shielded cab
, 2-conductor
le with TA3F-type
connector
OPTIONAL INTERCHANGEABLE UE-C cardioid (120°);
ELEMENTS UE-H h
ypercardioid (100°);
UE-O omnidirectional (360
CCESSORIES FURNISHED
A
T8531 power module; AT8154
A
o-stage foam windscreen;
tw
T8663 A-mount flange;
A
AT8664 A-mount cable
pass-through adapter; battery
†
In the interest of standards development, A.T.U.S. offers full details on its test
methods to other industry professionals on request.
ascal = 10 dynes/cm
*1 P
1
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
2
10 microbars = 94 dB SPL
=
°)
The U857AU features a 9.8' (3.0 m) permanently attached
miniature cab
le. It connects to the provided AT8531 power
module via a special TA3F-type connector designed to optimize RFI
immunity.
Cable exit is from the bottom of the microphone. The included
pass-through adapter, designed for use with desk stands and
microphone stands, provides a side-exit for the cable.
Avoid leaving the microphone in the open sun or in areas where
temperatures exceed 110° F (43° C) for extended periods.
Extremely high humidity should also be avoided.
NOTE: Audio-Technica has developed a special RFI-shielding
mechanism, which is an integral part of the connectors in the
UniPoint line. If you remove or replace the connector, you may
adversely affect the unit's RFI immunity.
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51688 ©2005 Audio-Technica U.S., Inc. Printed in U.S.A.
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