Audio Technica unipoint U851R, unipoint U851RW Specifications

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

U

6

0°

IDEAL
WORKING
ANGLE

851R/U851RW

CARDIOID CONDENSER
BOUNDARY MICROPHONES

• Designed for surface-mount
applications such as high­quality sound reinforcement,
professional recording,
television, conferencing and
other demanding sound pickup
situations

™

• PivotPoint

rotating output
connector allows cable to exit
from either the rear or the
bottom of the microphone

• Superior off-axis rejection for
maximum gain before
f

eedback

™

• UniGuard
technology off

RFI-shielding

ers outstanding
rejection of radio frequency
interference (RFI)

• Self-contained electronics eliminate need for external power
module

• Small-diameter UniPoint capsule near boundary eliminates phase
distortion and delivers clear, high-output performance

• Heavy die-cast case and non-slip silicon foam bottom pads
minimize coupling of surface vibration to the microphone

• Low-profile design with low-reflectance finish for minimum
visibility

• Available in two colors: black (U851R) and white (U851RW)

The U851R requires 11V to 52V phantom power for operation.

Supplied as a cardioid, the U851R accepts interchangeable
elements to permit selection of angle of acceptance from 100° to
360

°.

U851R/U851RW SPECIFICATIONS

†

ELEMENT Fixed-charge back plate

permanently polarized condenser

POLAR PATTERN Half-cardioid

(cardioid in hemisphere above
mounting surface)

FREQUENCY RESPONSE 30-20,000 Hz
LOW FREQUENCY ROLL-OFF 80 Hz, 18 dB/octave
OPEN CIRCUIT SENSITIVITY –34 dB (19.9 mV) re 1V at 1 Pa*
IMPEDANCE 200 ohms
MAXIMUM INPUT SOUND LEVEL 134 dB SPL, 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical) 108 dB, 1 kHz at Max SPL
SIGNAL-T
PHANT

OM POWER

O-NOISE RATIO

1

68 dB

, 1 kHz at 1 Pa*

11-52V DC

, 4 mA typical

REQUIREMENTS
SWITCH Flat, roll-off
WEIGHT 9.2 oz (262 g)
DIMENSIONS 4.25" (108.0 mm) long,

3.31" (84.0 mm) maximum width,

0.91" (23.0 mm) height

OUTPUT CONNECTOR TB3M-type
CABLE 25.0' (7.6 m) long, 0.13" (3.2 mm)

diameter, 2-conductor, shielded
cable with TA3F and XLRM-type
connectors

OPTIONAL INTERCHANGEABLE UE-H hypercardioid (100°)
ELEMENTS UE-O omnidirectional (360°)

ACCESSORY FURNISHED Soft protective pouch

†

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

1

Typical, A-weighted, using Audio Precision System One.

Specifications are subject to change without notice.

2

= 10 microbars = 94 dB SPL

The microphone should be placed on a flat,
unobstr

ucted mounting surface, with the front
of the microphone facing the sound source.
The sound source should not be below, or
higher than 60° above, the plane of the
mounting surface.

Output 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 filter provides easy switching from a flat
frequency response to a low-end roll-off. The roll-off position
reduces the pickup of low-frequency ambient noise (such as traffic,
air-handling systems, etc.), room reverberation and mechanically
coupled vibr

ations.

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.

NO

TE:Audio-Technica has developed a special RFI-shielding

mechanism, which is an integ

ou remo

If y

UniP

oint line

.

ral part of the connectors in the

ve or replace the connectors, you may

adversely affect the unit's RFI immunity.

NOTE: Placing any object on a surface (such as a conference table)

ore its finish is fully cured ma

bef

y result in damage to the finish.

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

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

www.audio-technica.com

P51702 ©2005 Audio-Technica U.S., Inc. Printed in U.S.A.