BHI NCH User manual
Features:
•Comfortable over-ear style headphones
•Active noise cancelling: 12 - 15dB
•Magnet: Neodymium
•Frequency Response: 20 - 20,000 Hz
•Maximum Input: 40mW
•Sensitivity: 110 dB
•Impedance: 32 ohms
•Weight: 190g (incl’ battery)
•Cable length: 1.25 m (detachable)
•Supplied with 1 x AAA alkaline battery
•Battery life 45 hours
•Dimensions: 210mm x 155mm x 70mm
Order code: NCH
Contents: NCH noise cancelling headphones, 1 x AAA alkaline battery.
Description:
The bhi NCH active noise cancelling headphones (ANC) reduce the effect of external
ambient background noise enabling you to have a more enjoyable listening experience. The
over-ear style NCH headphones also give good passive audio isolation from external noise.
They are an excellent choice for those wanting to reduce aircraft cabin noise, air conditioning
noise, train noise, ambient background noise and similar types of continuous environmental
noise so that they can enjoy a much improved listening experience. They are especially good
to use on a train or airplane whilst listening to audio or watching a video.
The adjustable headband and soft over-ear pads make sure that the headphones are a
comfortable fit. The NCH headphones require one AAA alkaline battery (supplied) and the
active noise cancellation can be easily switched on and off with the simple switch, and a
green LED indicates whether it is active or not. They come supplied with a detachable plug-
in 3.5mm stereo lead.
Note: If you are listening in a quiet environment you may not need to use the noise
cancelling function.
Note: Avoid wearing headphones when driving, cycling or any activity that requires quick
reactions or when your hearing must not be impaired. Do not wear your headphones for
extended periods of time at high volumes as this may damage your hearing.
bhi Ltd, 22 Woolven Close, Burgess Hill, West Sussex, RH15 9RR, UK
NCH
Active Noise Cancelling Headphones
Battery cover
Release button
1. Fit the AAA battery into the “R” side of the headphones as per 2 to 6 below.
2. Press battery cover button to release the cover and then pull down slightly in direction
of arrow as in picture 1.
3. Lift up the cover to expose the battery housing as in picture 2.
4. Push the AAA battery into the housing correctly. Make sure the polarity of the battery
lines up with the marks on the housing.
5. Close the battery housing as in picture 4 and push the cover up until it clicks into
place.
6. Make sure that one end of the detachable 3.5mm stereo headphone lead is connected
to the headphone socket on the “L” side of the NCH headphones. Connect the other
end of the audio lead to your audio source.
7. Switch the “ON/OFF” switch on the “L” side of the headphone to “ON”. The green
LED should light as in picture 5.
Note: To get the full benefit of the noise cancelling function on the NCH
headphones they need to be used in an environment where background noise is
present, otherwise keep the noise cancelling switched off.
Troubleshooting:
1. Noise reduction not working –Is there any background noise present, see note
above? Make sure the noise cancelling switch is on and the LED is lit green. If not
check the AAA battery is ok.
2. Low volume –Ensure that the audio source is playing and that the volume is
turned up sufficiently, and check that the 3.5mm stereo plug is connected properly
in the audio source and the NCH headphone socket.
3. Crackling noise or poor audio quality –Make sure that the connections to the
headphones and audio source are secure. Check the AAA battery.
4. Rumbling sound –Adjust the headphones to correctly fit comfortably on your head
and ears –Check that the earcup portholes aren’t blocked – Try changing the
battery.
5. Audio in one ear only –Check that the audio lead is pushed securely into the audio
socket on the “L” side of the headphones.
WEEE Statement
Weee Statement for correct disposal of this product: (Applicable in the European Union and other
European countries with separate collection systems). This marking shown on the product or its
literature indicates that it should not be disposed of with other household wastes at the end of its
working life. To prevent possible harm to the environment or human health from uncontrolled waste
disposal, please separate this from other types of wastes and recycle it responsibly to promote the sustainable
reuse of material resources. Household users should contact either the retailer where they purchased this
product, or their local government office, for details of where and how they can take this item for
environmentally safe recycling. Business users should contact their supplier and check the terms and conditions
of the purchase contract. This product should not be mixed with other commercial wastes for disposal.
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Instructions:
bhi Ltd, 22 Woolven Close, Burgess Hill, West Sussex, RH15 9RR, UK
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