Audio Technica unipoint U857RLU, unipoint U857RU Specifications

• 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 90° to 360°

• 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

The U857RU stands 16.81" (427.0 mm) from the table or podium; it
is also available in a 21.38" (543.0 mm) version as U857RLU. The
two models are identical in all other respects.

The U857R

U requires 11V to 52V phantom power for operation.

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.

The U857RU features a 9.8' (3.0 m) permanently attached
miniature cable. It connects to the provided AT8538 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.

A

void 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.

8 kHz

Polar Pattern

SCALE IS 5 DECIBELS PER DIVISION

LEGEND

200 Hz

1 kHz
5 kHz

Frequency in Hertz

LEGEND

12" or more on axis
Roll-off

Frequency Response

Response in dB

Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224

Audio-Technica Limited, Old Lane, Leeds LS11 8AG England

www.audio-technica.com

P51690 ©2005 Audio-Technica U.S., Inc. Printed in U.S.A.

U857RU/U857RLU

U857R

U/U857RLU SPECIFICATIONS

†

ELEMENT Fixed-charge back plate

per

manently polarized condenser

POLAR P

ATTERN

Line Cardioid

FREQ

UENCY RESPONSE

30-20,000 Hz

LO

W FREQUENCY ROLL-OFF

80 Hz, 18 dB/octa

ve

OPEN CIRCUIT SENSITIVITY –35 dB (17.7 mV) re 1V at 1 Pa*
IMPED

ANCE

250 ohms

MAXIMUM INPUT SOUND LEVEL 135 dB SPL, 1 kHz at 1%

T.H.D.

D

YNAMIC RANGE

(typical)

115 dB, 1 kHz at Max SPL

SIGNAL-TO-NOISE RATIO

1

74 dB, 1 kHz at 1 Pa*

PHANT

OM POWER REQUIREMENTS

11-52V DC

, 2 mA typical

SWITCH Flat, roll-off
WEIGHT

U857R

U

5.0 oz (141 g)

U857RLU 5.2 oz (148 g)
POWER MODULE 2.9 oz (81 g)

DIMENSIONS

U857R

U

16.81" (427.0 mm) long

U857RLU 21.38" (543.0 mm) long
BO

TH

0.48" (12.2 mm) head diameter

PO

WER MODULE

3.66" (92.9 mm) long,

0.74" (18.9 mm) diameter

OUTPUT CONNECTOR Integral 3-pin XLRM-type
(po

wer module)

CABLE 9.8' (3.0 m) long (per

manently
attached to microphone), 0.13"
(3.2 mm) diameter

, 2-conductor,

shielded cab

le with TA3F-type

connector

OPTIONAL INTERCHANGEABLE UE-C cardioid (120

°);

ELEMENTS UE-H h

ypercardioid (100°);

UE-O omnidirectional (360

°)

A

CCESSORIES FURNISHED

A

T8538 power module;

A

T8663 A-mount flange;
AT8664 A-mount cable pass­through adapter; AT8154 two­stage f

oam windscreen

†

In the interest of standards development, A.T.U.S. offers full details on its test
methods to other industry professionals on request.

*1 P

ascal = 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.

UNILINE™CONDENSER ADAPTER-MOUNT
GOOSENECK MICROPHONES