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ATM73a
CARDIOID CONDENSER
HEADWORN MICROPHONE
• Ideal for drummers, keyboard players or anyone requiring
hands-free operation
• Comfortable, unobtrusive headband design with side-of-mouth
pickup
• Belt-mounted power module operates on battery or phantom
power
• Cardioid polar pattern improves isolation of desired sound source
• Also available as ATM73cW – less power module; 55" (1.4 m)
cable terminated with locking 4-pin connector for A-T UniPak
wireless systems
The ATM73a requires 11V to 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.
An integral 80 Hz high-pass UniSteep
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.
For maximum stability and minimum visibility, the headband should
be worn around the back of the head, with each cushioned support
pad resting on the temple in front of the ear. The cable should
remain clipped to the headband, with some slack at the boom
connection. The headset is designed so the microphone descends
from the left support pad.
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.
™
®
filter provides easy switching
ATM73a SPECIFICATIONS
†
ELEMENT
POLAR PATTERN
FREQUENCY RESPONSE
LOW FREQUENCY ROLL-OFF
OPEN CIRCUIT SENSITIVITY
(Phantom / Battery)
IMPEDANCE (Phantom / Battery)
MAXIMUM INPUT SOUND LEVEL
(Phantom / Battery)
DYNAMIC RANGE (typical)
(Phantom / Battery)
SIGNAL-TO-NOISE RATIO
1
PHANTOM POWER REQUIREMENTS 11-52V DC, 2 mA typical
BATTERY TYPE
BATTERY CURRENT/LIFE
SWITCH
WEIGHT
MICROPHONE
POWER MODULE
DIMENSIONS
HEADSET
MICROPHONE
POWER MODULE
OUTPUT CONNECTOR
(power module)
CABLE
ACCESSORIES FURNISHED
†
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
1
Typical, A-weighted, using Audio Precision System One.
Specifications are subject to change without notice.
Polar Pattern
LEGEND
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
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
www.audio-technica.com
P51807
©2006 Audio-Technica U.S., Inc.
Fixed-charge back plate
permanently polarized condenser
Cardioid
40-15,000 Hz
80 Hz, 18 dB/octave
–55 dB (1.7 mV) /
–56 dB (1.5 mV) re 1V at 1 Pa*
200 ohms / 270 ohms
146 dB / 132 dB SPL,
1 kHz at 1% T.H.D.
111 dB / 97 dB,
1 kHz at Max SPL
59 dB, 1 kHz at 1 Pa*
1.5V AA/UM3
0.4 mA / 1200 hours typical
(alkaline)
Off, on-flat, on-roll-off
1.1 oz (31 g)
4.9 oz (139 g)
6.49" (165.0 mm) nominal at
widest point,
2.64" (67.0 mm) flexible boom
0.39" (10.0 mm) diameter
3.31" (84.0 mm) H x
2.48" (63.0 mm) W x
0.87" (22.0 mm) D
Integral 3-pin XLRM-type
4.6' (1.4 m) long (permanently
attached to microphone), 0.10"
(2.6 mm) diameter, 2-conductor
shielded cable with TA3F-type
connector
AT8531 power module; AT8128
windscreen; AT8125 windscreen;
battery
Frequency Response
Frequency in Hertz
12" or more on axis
Roll-off
Printed in Japan
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