HEC NCH20 User Manual
The active noise reduction technology built into these headphones allows them to
reduce annoying low frequency sounds, such as ambient noise found in airplanes,
trains and buses (over 12 dB at 300Hz). These headphones work to reduce the
low frequency ambient sounds without disturbing higher frequency sounds that
are present in the same area (car horns, human voice, telephones and sirens).
Please read these instructions completely before connecting or operating the unit.
Warning: Read all of these instructions before using this device. To reduce
the risk of fire or electric shock, do not expose this device to rain or
moisture.
To reduce the risk of electrical shock, do not open the cabinet. Refer servicing to
qualified personnel only.
Read these instructions and keep these instructions. Heed all warnings.
This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions:
This device may not cause harmful interference;
This device must accept any interference received, including interference that may
cause undesired operation.
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
Caution
1. Prolonged exposure to loud music may cause hearing damage. Hearing experts
advise against continuous extended play and high levels.
2. Do not use while driving motorized vehicles. This may lead to trac accidents
and is illegal in many areas.
3. If you experience ringing in your ears, reduce volume or discontinue use.
4. Do not drop, sit on or allow the headphones to be immersed in water.
Noise Cancelling
Headphones
User Manual
Model #NCH20
ONE | SAFETY PRECAUTIONS
Staple your receipt to your manual. You
will need it to obtain warranty service.
Model number ___________________
Date of purchase _________________
1. Safety Precautions
2. Parts and Features
3. Installation Instructions
4. Features and Use
5. Care and Cleaning
6. Troubleshooting
7. Warranty
Installing a battery
1. Press down the tab on the
back of the controller and pull
to open and gain access to the
battery compartment.
2. Insert one R02/AAA battery
in the battery compartment.
Ensure the correct polarity
when installing the battery.
Insert the Negative end first.
3. Align the battery lid with the battery compartment, then snap to close the
battery lid.
SAVE THESE INSTRUCTIONS
TABLE OF CONTENTS
TWO | PARTS AND FEATURES
THREE | INSTALLATION INSTRUCTIONS
Adaptor Plug
Pouch
Mute Switch
Power
Indicator
Volume
Control
Thank you for purchasing our HEC device. This easy to use manual will guide you
in getting the best use of your Noise Cancelling Headphones.
Remember to record the model number. It is located on the front of the packaging.
Shirt Clip
(not shown)
Using Your Headphones
1. If you intend to use the headphones for noise reduction only, simply turn the
power switch to the “ON” position. The LED on the controller will light. In this
mode, no cable connection is required.
2. Turn the power switch to “OFF” if noise reduction is no longer required. The unit
will then operate like normal headphones.
Noise cancelling headphones reduce unwanted ambient noise, providing a quieter
environment to enhance your listening experience. These headphones can be
used with or without the noise cancellation feature. Use the supplied plug-in
adaptor for easy connectivity to in-flight music services. Please use the shirt clip
on the back of the controller for secure and easy access to controls. For storage,
simply fold the ear cups in toward the headband and place in your travel pouch.
Connection to an Audio Source
You can use the headphones with a variety of audio sources such as CD, DVD, MP3
player, laptop computer or home stereo unit. To make a connection, simply insert
the headphone plug into the phone jack or the audio source.
1. Turn the power switch to “ON” and adjust the volume control to the desired
sound level. Note that the power indicator light is lit.
2. To stop the sound from the headphones temporarily, slide the mute switch to
the right as indicated by the arrow on the cabinet. To cancel the mute function,
slide the mute switch in the opposite direction.
3. Slide the power switch to the “OFF” position to turn o the unit after use.
FOUR | FEATURES AND USE
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