Audio-Technica AT849 User Manual

AT849 STEREO BOUNDARY MICROPHONE

• Designed for surface-mount applications in broadcast, professional recording and sound reinforcement

• Low-profile design for minimum visibility

• Pair of closely-matched cardioid elements provides the spatial impact and realism of a live sound field

• The combination of a rugged die-cast case and rubber non-slip bottom pad minimizes mechanical coupling of surface vibrations to the microphone

• Switchable low-frequency roll-off

The AT849 requires 9V to 52V DC phantom power on each channel for operation.

Output for each stereo channel is low impedance (Lo-Z) balanced. The balanced signals of the TB5M output connector appear across Pins 2 and 3 for the left channel, Pins 4 and 5 for the right channel. Pin 1 is ground (shield) for both channels. Output is “Pins 2 and 4 hot” – positive acoustic pressure produces positive voltage at Pins 2 and 4.

The 3-pin XLRM cable connectors for the left and right channels are marked with gray and red bands, respectively. The signal appears across Pins 2 and 3;

Pin 1 is g

round (shield). Output phase is “Pin 2

hot” – positive acoustic pressure produces positive voltage at Pin 2.

The symmetry and area of the mounting surface directly affect the sensitivity of the

60°

IDEAL WORKING ANGLE

AT849 at low frequencies, as well as the overall

The microphone

stereo balance and image

. should be centered on the surface and positioned with the microphone facing the sound source. The sound source should not

be below, or higher than 60° above, the plane of the mounting surface.

Locating the AT849 nearer the sound source enhances the width of the stereo image, while decreasing room ambience. Conversely, as the mic position moves away from the sound source, a narrower

ight stereo image results and more of the

left/r

The high sensitivity of the A

T849 assures useful output and an

“room sound”

is noted.

excellent match to most inputs. However, the microphone’s high output may overload some sensitive electronic input stages under some conditions

. Many pre-amps and mixers include a mic pad or input attenuator control to prevent overload; or, use an AT8202 attenuator or equal at the input.

Avoid leaving the microphone in the open sun or in areas where temperatures exceed 110

F (43

xtended per

or e

C) f

iods. Extremely

high humidity should also be avoided.

AT849 SPECIFICATIONS

†

ELEMENTS Fixed-charge back plate

permanently polarized condenser

POLAR PATTERN X/Y stereo

FREQUENCY RESPONSE 30-20,000 Hz

LOW FREQUENCY ROLL-OFF 150 Hz, 6 dB/octave

OPEN CIRCUIT SENSITIVITY –40 dB (10.0 mV) re 1V at 1 Pa*

CHANNEL BALANCE ≤ 2.5 dB

IMPEDANCE 200 ohms balanced

MAXIMUM INPUT SOUND LEVEL 137 dB SPL, 1 kHz at 1% T.H.D.

SIGNAL-TO-NOISE RATIO

67 dB, 1 kHz at 1 Pa*

DYNAMIC RANGE (typical) 110 dB, 1 kHz at Max SPL

PHANTOM POWER 9-52V DC, 2 mA typical

UIREMENTS

REQ

(each channel)

SWITCH Flat, roll-off

WEIGHT (less cable and accessory) 5.3 oz (149 grams)

DIMENSIONS 3.62" (92.0 mm) maxim

length,

2.87" (73.0 mm) maximum width

OUTPUT CONNECTOR Integral 5-pin TB5M

CABLE 25' (7.6 m) long, shielded,

vinyl-jacketed, stereo cable with 5-pin TA5F connector at microphone end, two 3-pin XLRM-type connectors at output end

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

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

Specifications are subject to change without notice.

Stereo

Polar Pattern

330°

300°

270°

240°

210°

180°

SCALE IS 5 DECIBELS PER DIVISION

LEGEND

LEFT

1 kHz

= 10 microbars = 94 dB SPL

0°

30°

60°

90°

120°

150°

RIGHT

1 kHz

LEGEND

Frequency Response

200100

12" or more on axis (flat)

Roll-off

500

Frequency in Hertz

10k

20k

10 dB

Response in dB

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

echnica Limited,

Audi

Old Lane, Leeds L

1 8AG England

www.audio-technica.com