USER
HM-20U Headmic™
GUIDE
Congratulations on purchasing the NADY HM-20U miniature uni-directional condenser
headset microphone. Optimally designed for singing and speaking applications,
even in noisy environments. Its small, lightweight design makes it ideal for hands-
free use with minimum visibility. Perfect for singer-musicians (drummers,
keyboardists), vocal/dance performers, DJ's, television announcers, public
speakers, and aerobics instructors.
STANDARD ITEMS SUPPLIED
• HM-20U unidirectional headmic with small foam windscreen
• Additional foam windscreen
• Extra boom assembly
• User guide and Warranty card
OPTIONAL ACCESSORIES
• XM-10
5V-10V DC)
Mini-XLR to XLR phantom power adapter (converts 48V phantom power to
—
• HM-CC1 — Plastic headmic carrying case
FEATURES
• Full-frequency, uni-directional electret condenser mic
• Warm, transparent audio and maximum feedback rejection
• Durable, thin metal frame easily molded to any user
• Ergonomic design and comfortable fit with or without glasses, hat, or headphones
(also no hairstyle hindrance)
• Tiny 5 x 8 mm lightweight capsule for hours of comfortable use
• Two sizes of foam windscreen included to reduce wind/popping noise
• Extendable, fully adjustable boom for optimum mic capsule placement
• Available with mini-XLR, 3.5mm phono plug (fits most standard wireless bodypack
transmitters) or with standard XLR adapter for all wired and wireless applications
• Choice of black or beige
SPECIFICATIONS
Element: Back electret condenser
Polar pattern: Uni-directional cardioid
Frequency Response: 20Hz~20KHz
Sensitivity: -46dB 3dB
Output impedance: 1K Ohms 5%
SPL max: 135dB
Power Supply: 1.5-12V DC
Capsule: 5x8mm
Cable: 1.5mm dia, 1M (40")
Weight: 0.6 oz. (18g)
Output connector: 3.5mm mini-locking plug or 3pin mini-XLR
connector
Mini-XLR Wiring: GND = Pin 1, Hot (+) = Pin 3 --> 2K Ohms --
> Pin 2
3.5mm Plug Wiring: GND = Sleeve, Hot (+) = Tip Foam
windscreen and extra boom assembly included
USE & CARE
The headset’s arch-shaped rests are placed over each ear and the remainder of the band
extends around the back of the head just above the neck. The tip of the supporting arches
rests on the temple just in front of the ear providing the necessary stability during use. The
mic boom descends from the ear on the left side.
Specifications and design subject to change for improvement
purposes without prior notice.
Carefully loosen the boom by unscrewing the assembly one-quarter turn. Place the
microphone capsule close to the mouth to a favorable audio position. Tighten the boom
assembly. Bend the boom and headset slightly for optimum fit.
FREQUENCY RESPONSE &
POLAR PATTERN
Connect the Mini-XLR or 3.5mm phono plug of the microphone cable to the input jack of
the bodypack transmitter or XM-10 phantom power adapter. When using a phantom power
adapter, connect it to the microphone input of an audio preamp that provides phantom
power.
The entire HM-20U assembly has been moisture-proofed to guard against deterioration
during use. After use in a high moisture application such as aerobics or a stage
performance, remove the foam screen, wipe the headset with a dry soft cloth and permit it
to air-dry. Do not store the unit in a closed space (e.g., a plastic bag) until all moisture has
evaporated, and avoid conditions of extremely high humidity. This will help maintain the
HM-20U’s excellent performance. While the HM-20U is not unusually sensitive to the
outside environment, extremes in temperature can be harmful. Avoid, for example, leaving
the microphone in direct sunlight for long periods of time.
-40
-50
-60
-70
-80
-90
-100
-110
-120
50
100
200
500
1k
2k
5k
10k
20k
[Hz]
SERVICE FOR YOUR NADY AUDIO PRODUCT
(U.S.) Should your NADY AUDIO product require service, please contact the Nady
Service Department via telephone at (510) 652-2411, or e-mail to service@nady.com.
NADY SYSTEMS, Inc.
6701 Shellmound Street • Emeryville, CA 94608
Phone: 510.652.2411 • Fax: 510.652.5075
(International) For service, please contact the NADY AUDIO distributor in your country
through the dealer from whom you purchased this product.
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