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USING YOUR HEADPHONES
1.Your headphones are supplied with an in-line battery compartment on the
cable. Grasping the housing firmly with your hands remove the battery door by
sliding it open as indicated by the arrow on the cover. Insert a fresh alkaline
AAA battery.
2. The headphones are provided with a 3.5mm stereo mini plug for the signal
input and can be used with a variety of AV equipment as supplied: CD, DVD, or
MP3/4 players, personal or laptop computers, or home stereo systems. It can
also be used for most airline audio with the optional dual plug adapter (not sup-
plied). Some audio sources with a 1/4” jack, such as professional audio mixers,
require the use of an optional readily available 1/4”— 3.5mm mini stereo plug
adapter. After you have confirmed plug/jack compatibility, connect the head-
phones to the equipment to which you will be listening.
3. Adjust the headband by pulling up or down on each end so it rests gently on
top of your head and the ear cup cushions fit comfortably around your ears.
Always wear the headphones with the cable on the left to ensure proper L/R
stereo sound.
4. Turn on the power for the noise canceling circuitry with the sliding ON/OFF
switch on the in-line battery compartment housing on the headphones cable.
The red LED will light whenever power is ON and you should then hear that the
ambient noise is reduced. If you're using the headphones in a quiet location
you may not need the noise-canceling feature. In that case, simply leave the
power OFF and use like standard passive headphones.
5. Turn on the power of the equipment to which are connected and you are ready
to enjoy listening noise-free, even if you are in a noisy environment.
6. Always make sure the power is turned off and LED is not lit whenever you are
storing the headphones or not using them.
TROUBLESHOOTING
No sound
• Check the connection of the headphones and the AV equipment to which is
connected
• Check that the connected AV equipment is turned on and the volume is up
Noise Reduction Absent
• Check that the headphones power is turned on (LED lit)
• Replace the battery with a fresh alkaline
SPECIFICATIONS
Driver ..............................................................................................50mm diameter
Frequency Response ..........................................................................20Hz-20KHz
Impedance..................................................................................................32 ohms
Sensitivity ......................................120dB/mW (power on)/ 115dB/mW (power off)
Noise Reduction Level ..............................................................-10dB, 50Hz-1KHz
Power Supply ..............................................................Single AAA alkaline battery
Plug ....................................................................................3.5mm stereo mini-plug
Cord ..............................................................................................50 inches, +/-5%
Typical Battery Life ......................Up to 25 hours (depending on listening volume)
For product improvement purposes, design and specifications are subject to
change at any time without prior notice
QH50NC_userguide 2/5/07 10:01 AM Page 3