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HM-3 Headmic
The HM-3 is an ultra-light miniature cardioid polar pattern
headworn condenser microphone, specifically designed to pro-
vide close-miked vocal pick-up in applications for which hands-
free operation is required. Nady pioneered the first headworn
mics on the market almost 20 years ago with the introduction
of the original Headmic™.
Now, with the HM-3, DJ's, speakers,
aerobic instructors, auctioneers and
others who require hands free mobility
and high quality spoken vocals with
improved gain before feedback can
achieve better performance than is
available with small omni directional
lapel microphones. With its high sensi-
tivity and ultra clarity, the HM-3 is opti-
mally designed for all speaking applica-
tions. The close-up unidirectional vocal
pickup provides a full sound while sup-
pressing irritating background noises.
FEATURES
The HM-3 features an adjustable
boom that can be set at any angle
required by the user. The head worn
support system is extremely light and
comfortable, and is designed to be visu-
ally unobtrusive while worn. Its ear rests
and temple provide maximum stability
during use, even while moving, or shak-
ing the head. The durable cable assem-
bly and internal construction are
designed to minimize handling noise
from contact and movement.
The HM-3 incorporates state-of-the-
art technology in an ultra-light housing
that can be worn for many hours at a
time in total comfort. The advanced
design offers improved reliability under
adverse operating conditions and stable
performance.
The HM-3 is designed to operate
with wireless microphone transmitters,
NADY SYSTEMS, Inc.
6701 Shellmound Street • Emeryville, California 94608
Phone: 510.652.2411 • Fax: 510.652.5075
www.nadywireless.com
such as the Nady
WLT-14, WLT-15,
UB-10, or UB-16. The HM-3
requires no troublesome batteries and is
phantom powered from the input con-
nector to the transmitter.
USE & CARE
The headband's shaped rests are
placed on top of each ear and the rest of
the band extends around the back of the
head. The pad supporting the boom
rests on the temple in front of the ear,
providing the necessary stability during
use. The flexible mic boom descends
from the ear on the left side and can
easily be adjusted for the proper angle
required.
The entire HM-3 assembly has been
moisture-proofed to guard against dete-
rioration during use. After a high mois-
ture application, such as aerobics,
remove the foam screen, wipe off the
headset with a towel, and permit it to air-
dry. Do not store the unit in a closed
space (e.g., a plastic bag) until all mois-
ture has evaporated, and avoid condi-
tions of extremely high humidity. This
will help maintain the HM-3's excellent
performance. While the HM-3 is not
unusually sensitive to the outside envi-
ronment, extremes in temperature can
be harmful.
Therefore, for example,
avoid leaving the microphone in direct
sunlight for long periods of time.
USER
™
GUIDE
Typical Frequency Response Curve
+20
+10
dB
0
-10
-20
20
50
100
200
500
1K
Measurement Circuit
(Test Condition Vs=3V R
Ta=20°c R.H.=65%)
FET impedance
converter
ECM
unit
Shield case
SPECIFICATIONS
Element: Condenser
Polar Pattern: Cardioid (Unidirectional)
Frequency Response: 100Hz~13kHz
Sensitivity: -40dB ±3dB(@1kHz,74dB SPL)
Impedance: 2.2KOhms ohms ±30% @1kHz
Cable Length: 43" (1092 mm)
Dimensions: Headset: 5.66" (144 mm)
nominal at widest point; 4.5" (114 mm)
flexible boom, .155" (3.9 mm) diameter
Weight: 1.10 oz. (30.8 grams) w/cable
2K
5K
10K
20K
=2.2K
L
C
Term.1
Output
RL
+Vs
Gournd
Term.2
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