Audio Technica ATM73a Manual, Specifications

• 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
®
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.
For maximum stability and minimum visibility, the headband should
be w
orn around the back of the head, with each cushioned support
pad resting on the temple in front of the ear
.
The cab
le 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.
A
void 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.
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.    Printed in Japan
ATM73a
ATM73a SPECIFICATIONS
†
ELEMENT Fixed-charge back plate
permanently polarized condenser
POLAR PATTERN Cardioid 
FREQ
UENCY RESPONSE
40-15,000 Hz
LOW FREQUENCY ROLL-OFF 80 Hz, 18 dB/octave
OPEN CIRCUIT SENSITIVITY –55 dB (1.7 mV) / 
(Phantom / Batter
y) –56 dB (1.5 mV) re 1V at 1 Pa*
IMPEDANCE (Phantom / Battery) 200 ohms / 270 ohms
MAXIMUM INPUT SOUND LEVEL 146 dB / 132 dB SPL, 
(Phantom / Batter
y) 1 kHz at 1% T.H.D.
DYNAMIC RANGE (typical) 111 dB / 97 dB, 
(Phantom / Battery) 1 kHz at Max SPL
SIGNAL-TO-NOISE RATIO
1
59 dB, 1 kHz at 1 Pa*
PHANTOM POWER REQUIREMENTS 11-52V DC, 2 mA typical
BATTERY TYPE 1.5V AA/UM3
B
ATTERY CURRENT/LIFE
0.4 mA / 1200 hours typical 
(alkaline)
SWITCH Off, on-flat, on-roll-off
WEIGHT
MICR
OPHONE
1.1 oz (3
1g)
POWER MODULE 4.9 oz (139 g)
DIMENSIONS
HEADSET
6.49" (165.0 mm) nominal at 
widest point, 
2.64" (67.0 mm) flexible boom
MICROPHONE 0.39" (10.0 mm) diameter
POWER MODULE 3.31" (84.0 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 4.6' (1.4 m) long (permanently 
attached to microphone), 0.10"
(2.6 mm) diameter, 2-conductor
shielded cable with TA3F-type 
connector  
ACCESSORIES FURNISHED AT8531 power module; AT8128 
windscreen; AT8125 windscreen;
battery 
†
In the interest of standards de
v
elopment, A.T.U.S. offers full details on its test 
methods to other industry professionals on request.
*1 P
ascal = 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.
CARDIOID CONDENSER 
HEADWORN MICROPHONE

8 kHz
Polar Pattern
SCALE IS 5 DECIBELS PER DIVISION
LEGEND
200 Hz
1 kHz
5 kHz

Frequency in Hertz
LEGEND
12" or more on axis
Roll-off
Frequency Response
Response in dB

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