Audio-Technica U841A User Manual

Polar Pattern

SCALE IS 5 DECIBELS PER DIVISION

LEGEND

Frequency in Hertz

LEGEND

12" or more on axis Roll-off

Frequency Response

Response in dB

841A

OMNIDIRECTIONAL CONDENSER BOUNDARY MICROPHONE

• Designed for surface-mount applications such as highquality sound reinf

orcement, professional recording, television, conferencing and other demanding sound pic

kup

situations

™

• UniGuard

RFI-shielding technology offers outstanding rejection of radio frequency interference (RFI)

• UniSteep steep lo

filter provides a

w-frequency attenuation to improve sound pickup without affecting voice quality

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

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

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

• Operates on battery or phantom power

The U841A requires 11-52V DC phantom power or a 1.5V AA battery for operation. A battery need not be in place for phantom power operation.

Battery installation: Remove the cap from the top of the power module. Insert a fresh 1.5V AA battery (“+” end toward the cap release b

utton), then reassemble the power module. Alkaline batteries are recommended for longest life. Remove the battery during long-term storage.

The microphone should be placed on a flat, unobstructed mounting surface. The sound source should not be below the plane of the mounting surface.

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 positiv

An integral 80 Hz high-pass UniSteep from a flat frequency response to a lo roll-off position reduces the pic

e voltage at Pin 2.

filter provides easy switching

w-end roll-off. The

kup of low-frequency ambient noise (such as traffic, air-handling systems, etc.), room reverberation and mechanically coupled vibrations.

U841A SPECIFICATIONS ELEMENT Fixed-charge back plate

POLAR PATTERN Omnidirectional in hemisphere

FREQUENCY RESPONSE 30-20,000 Hz LOW FREQUENCY ROLL-OFF 80 Hz, 18 dB/octave OPEN CIRCUIT SENSITIVITY –39 dB (11.2 mV) /

(Phantom / Battery) –40 dB (10.0 mV) re 1V at 1 Pa*

IMPEDANCE (Phantom / Battery) 200 ohms / 270 ohms MAXIMUM INPUT SOUND LEVEL 132 dB / 122 dB SPL,

(Phantom / Battery) 1 kHz at 1% T.H.D. DYNAMIC RANGE (typical) 111 dB / 101 dB,

(Phantom / Battery) 1 kHz at Max SPL

SIGNAL-TO-NOISE RATIO PHANTOM POWER 11-52V DC, 2 mA typical

REQUIREMENTS BATTERY TYPE 1.5V AA/UM3 BATTERY CURRENT / LIFE 0.4 mA / 1200 hours typical

SWITCH Off, on-flat, on-roll-off WEIGHT

MICROPHONE POWER MODULE 4.9 oz (139 g)

DIMENSIONS

MICROPHONE

POWER MODULE 3.31" (84.0 mm) H x

OUTPUT CONNECTOR Integral 3-pin XLRM-type

(power module)

CABLE 25' (7.6 m) long (permanently

ACCESSORIES FURNISHED AT8531 power module; battery;

†

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

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

Specifications are subject to change without notice.

†

10 microbars = 94 dB SPL

permanently polarized condenser

above mounting surface

73 dB, 1 kHz at 1 Pa*

(alkaline)

2.8 oz (78 g)

2.56" (65.0 mm) diameter,

0.59" (15.1 mm) height

2.48" (63.0 mm) W x

0.87" (22.0 mm) D

attached to microphone), 0.13" (3.2 mm) diameter, 2-conductor, shielded cable with TA3F-type connector

soft protective pouch

Avoid leaving the microphone in the open sun or in areas where temper Extremely high humidity should also be a

mechanism, which is an integ UniP

atures exceed 110° F (43° C) for extended periods.

oided.

eloped a special RFI-shielding

TE:Audio-T

echnica has de

ral part of the connectors in the

ou remove or replace the connector, you may

If y

oint line

adversely affect the unit's RFI immunity.

NOTE: Placing any object on a surface (such as a conference table) before its finish is fully cured may 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