200 Hz
1 kHz
5 kHz
8 kHz
LEGEND
Same as 1 kHz
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
90
60
120
30
150210
240
270
300
330
180
0
LEGEND
Roll-off
Frequency in Hertz
ResponseindB
10 dB
20k10k5k2k1k50020010050
Frequency Response
12" or more on axis (flat)
· High intelligibility for lecturers and stage/TV performers
· Provides excellent yet unobtrusive sound pickup
· Switchable low-frequency roll-off
· Operates on battery or phantom power
The AT803b is designed to be worn as a lavalier or hidden in loose
clothing or in the hair. 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 AT803b requires 9-52V 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 microphone'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 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.
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.
AT803b 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 ­45 dB (5.6 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) 106 dB / 92 dB,
(Phantom / Battery) 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO1
65 dB, 1 kHz at 1 Pa*
PHANTOM POWER 9-52V 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 0.09 oz (2.5 g)
POWER MODULE 5.2 oz (147 g)
DIMENSIONS
MICROPHONE 0.81" (20.5 mm) long,
0.39" (10.0 mm) diameter
POWER MODULE 3.27" (83.0 mm) H x
2.48" (63.0 mm) W x
0.87" (22.0 mm) D
OUTPUT CONNECTOR Integral 3-pin XLRM-type
(power module)
CABLE Integral 6' (1.8 m), permanently
attached between microphone
and power module
ACCESSORIES FURNISHED AT8417 clothing clip;
AT8530 power module;
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/cm2
= 10 microbars = 94 dB SPL
1
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
Audio-Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224
Audio-Technica Limited, Old Lane, Leeds LS11 8AG England
www.audio-technica.com
P51665-EN ©2004 Audio-Technica U.S., Inc. Printed in Japan
AT803b MINIATURE OMNIDIRECTIONAL CONDENSER MICROPHONE