Miniature Omnidirectional


AT803	MINIATURE OMNIDIRECTIONAL


	CONDENSER MICROPHONE

•High intelligibility for lecturers and stage/TV performers

•Provides excellent yet unobtrusive sound pickup

•UniSteep® filter provides a steep low-frequency attenuation to improve sound pickup without affecting voice quality

•Operates on battery or phantom power

The AT803 is designed to be worn as a lavalier or hidden in loose clothing. For use as a lavalier, attach the microphone about six inches below the chin. Anticipate movements that may cause the microphone to rub against or be covered by clothing, and position the microphone to avoid it.

The AT803 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 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.

To avoid phase cancellation and poor sound, all mic cables must be wired consistently: Pin 1-to-Pin 1, etc.

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 microphone is RoHS compliant–free from all substances specified in the EU directive on hazardous substances.

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.

AT803 SPECIFICATIONS†

ELEMENT	Fixed-charge back plate
	permanently polarized
	condenser

POLAR PATTERN	Omnidirectional

FREQUENCY RESPONSE	30-20,000 Hz

LOW FREQUENCY ROLL-OFF	80 Hz, 18 dB/octave

OPEN CIRCUIT SENSITIVITY	–44 dB (6.3 mV) /
(Phantom / Battery)	–46 dB (5.0 mV) re 1V at 1 Pa*

IMPEDANCE (Phantom / Battery)	200 ohms / 270 ohms

MAXIMUM INPUT SOUND LEVEL	135 dB / 121 dB SPL,
(Phantom / Battery)	1 kHz at 1% T.H.D.

DYNAMIC RANGE, (typical)	107 dB / 93 dB,
(Phantom / Battery)	1 kHz at Max SPL

SIGNAL-TO-NOISE RATIO1	66 dB, 1 kHz at 1 Pa*
PHANTOM POWER	11-52V DC, 2 mA typical
REQUIREMENTS

BATTERY TYPE	1.5V AA/UM3

BATTERY CURRENT / LIFE	0.4 mA / 1200 hours typical
	(alkaline)

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

WEIGHT (less cable and accessories)
MICROPHONE	2.8 g (0.1 oz)
POWER MODULE	139 g (4.9 oz)

DIMENSIONS
MICROPHONE	25.0 mm (0.98") long,
POWER MODULE	10.2 mm (0.40") diameter
POWER MODULE	84.0 mm (3.31") H x
	63.0 mm (2.48") W x
	22.0 mm (0.87") D

OUTPUT CONNECTOR	Integral 3-pin XLRM-type
(power module)

CABLE	1.8 m (6') long (permanently
	attached to microphone),
	2.6 mm (0.10") diameter,
	2-conductor, shielded cable with
	TA3F-type connector

ACCESSORIES FURNISHED	AT8531 power module;
	AT8419 clothing clip;
	AT8116 windscreen; battery;
	protective carrying case

†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 2 = 10 microbars = 94 dB SPL

1Typical, A-weighted, using Audio Precision System One. Specifications are subject to change without notice.

Polar Pattern

Frequency Response

Response in dB

Frequency in Hertz

LEGEND		12" or more on axis

SCALE IS 5 DECIBELS PER DIVISION		Roll-off
LEGEND

200Hz 1 kHz 5 kHz 8 kHz

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

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

AT803

CONDENSER MICROPHONE