Nady Systems HM-3 Headmic User Manual

HM-3 Headmic

™

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

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,

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

NADY SYSTEMS, Inc.

6701 Shellmound Street • Emeryville, California 94608

Phone: 510.652.2411 • Fax: 510.652.5075

www.nadywireless.com

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™.

+20

+10

0

dB

-10

-20

20

50

100

200

500

1K

2K

5K

10K

20K

Typical Frequency Response Curve

Output

Gournd

Term.2

Term.1

C

RL

+Vs

FET impedance

converter

ECM

unit

Shield case

Measurement Circuit

(Test Condition Vs=3V R

L

=2.2K

Ω

Ta=20°c R.H.=65%)