Sennheiser Headphones 502818 User Guide

Stereo Headphones  
PXC 250-II  
Instruction manual  
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Important safety information  
Important safety information  
Please read this instruction manual carefully and  
completely before using the product.  
Make this instruction manual easily accessible to all  
users at all times. Always include this instruction  
manual when passing the product on to third  
parties.  
Do not use the product in situations which require  
special attention (e.g. in traffic or when performing  
skilled jobs).  
Always keep the product dry and do not expose  
it to extreme temperatures (normal operating tem-  
peratures: 10°C/50°F to 35°C/95°F).  
Use the product with care and store it in a clean,  
dust-free environment.  
The headphones contain magnets that generate a  
magnetic field which could cause interference with  
cardiac pacemakers and implanted defibrillators.  
Keep the headphones at least 1.2” (3 cm) from  
cardiac pacemakers or implanted defibrillators  
Please protect your hearing from high volume levels.  
Sennheiser headphones also sound exceptionally  
good at low volumes.  
Intended use  
Intended use of this product includes  
having read this instruction manual, especially the  
chapter “Important safety information”,  
using the product within the operating conditions  
and limitations described in this instruction manual.  
“Improper use” means using the product other than as  
described in this instruction manual, or under operating  
conditions which differ from those described herein.  
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Important safety information  
Safety instructions for standard batteries  
If abused or misused, batteries may leak and, in extreme  
cases, may even present an explosion and fire hazard.  
Sennheiser does not accept any liability for damage  
arising from abuse or misuse.  
Keep away from children.  
Do not short-circuit.  
Do not heat above 70°C/158°F, e.g. do not  
expose to sunlight or throw into a fire.  
Do not mutilate or dismantle.  
Do not continue to use defective batteries.  
Immediately remove batteries from obviously  
defective products.  
Remove batteries from the product when it is  
not used for extended periods of time.  
Do not expose to moisture.  
Do not charge non-rechargeable batteries.  
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PXC 250-II headphones  
PXC 250-II headphones  
The PXC 250-II are closed, dynamic, supra-aural stereo  
headphones with NoiseGard active noise compensation,  
designed for use with in-flight entertainment systems.  
The combination of passive and active noise reduction  
enables you to enjoy music even in noisy environments.  
Comfortable to wear and easy to use, the sturdy,  
foldable headphones are also ideal for use with portable  
audio sources.  
NoiseGardTM  
The NoiseGard active noise compensation system is  
based on the principle of cancelling out sound using  
“anti-sound” (phase-inverted sound). Tiny microphones  
pick up low-frequency ambient noise (up to 1 kHz) near  
the ear. The NoiseGard electronics use this noise to  
generate a sound wave which is the exact opposite  
(IE: at the same level but polarity reversed – 180° out-  
of-phase), the effect being that the polarity reversed  
signal cancels most of the outside noise.  
Delivery includes  
1 PXC 250-II headphones  
1 transport case  
1 in-flight adapter  
(3.5 mm double mono jack plug)  
1 AAA size alkaline battery, 1.5 V  
1 instruction manual  
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Product overview  
Product overview  
Overview of operating controls  
³
·
´
¿
²
»
³ Headband  
´
– Volume + control  
· Ear pads  
² NoiseGard On – Off  
switch with LED  
» Audio cable  
¿ Battery compartment  
Clip  
LED indications  
LED  
Meaning  
Page  
lights up red NoiseGard is switched on  
9
9
9
flashes red  
is off  
Battery is almost flat  
NoiseGard is switched off  
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Putting the PXC 250-II into operation  
Putting the PXC 250-II into  
operation  
WARNING! Magnetic fields can interfere with cardiac  
pacemakers  
The headphones contain magnets that  
generate a magnetic field which could  
cause interference with cardiac pace-  
makers and implanted defibrillators.  
̈ Keep the headphones at least 1.2”  
(3 cm) from cardiac pacemakers and  
implanted defibrillators.  
Unfolding the headphones  
̈ Separate the notched locking connection of the  
headband by gently pulling it apart.  
̈ Unfold the headphones.  
̈ Turn the ear cups outwards by 90°.  
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Putting the PXC 250-II into operation  
Inserting and changing the battery  
For best product performance, we recommend  
using a standard battery instead of a rechargeable  
battery.  
For powering the NoiseGard active noise compensation,  
an AAA size battery is required.  
̈ Open the battery compartment ¿.  
̈ Remove the flat battery (where applies).  
̈ Insert a new battery. Observe correct polarity when  
inserting the battery.  
̈ Close the battery compartment ¿. The cover lock  
into place with an audible click.  
¿
Connecting the headphones  
̈ Connect the audio cable » to the headphone socket  
of your audio source.  
You hear the sound from your audio source.  
̈ Slip on the in-flight adapter if you wish to use  
the headphones with the in-flight entertainment  
system of the aircraft.  
Music  
Photos  
Videos  
Extras  
Settings  
Shuffle Songs  
»
»
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Using the PXC 250-II  
Adjusting the headband  
For good noise attenuation and best possible comfort,  
the headband has to be adjusted to properly fit your  
head.  
̈ Wear the headphones so that  
the headband ³ runs over  
the top of your head.  
³
̈ Adjust the length of the  
headband so that  
·
– the ear pads · rest com-  
fortably on your ears,  
– a snug fit of the head-  
band ³ on the head is  
ensured.  
To ensure maximum noise attenuation, final  
adjustment is best made in a noisy environment.  
Using the PXC 250-II  
Adjusting the volume  
WARNING Hearing damage due to high volumes!  
Listening at high volume levels for long  
periods can lead to permanent hearing  
defects.  
̈ Before putting the headphones on, set  
the volume to a low level.  
̈ Do not continuously expose yourself to  
high volumes.  
̈ Use the – VOLUME + ´ control to set the volume to  
a comfortable level.  
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Using the PXC 250-II  
Vol +  
Vol –  
´
Switching NoiseGard on and off  
To switch NoiseGard on:  
̈ Move the NoiseGard On – Off ² switch to the On  
position.  
The LED lights up red.  
To switch NoiseGard off:  
̈ Move the NoiseGard On – Off ² switch to the Off  
position.  
The LED goes off.  
²
On  
Off  
When the battery is almost empty, the LED flashes  
red. NoiseGard will continue to function for  
approximately 2 hours.  
When the battery is completely discharged, the  
NoiseGard active noise compensation auto-  
matically switches off. Audio will still be heard  
through the headphones.  
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Transporting the PXC 250-II  
Transporting the PXC 250-II  
For space-saving transportation, the headphones can be  
folded up flatly and compactly.  
̈ Rotate the ear cups by 90°.  
̈ Fold up the headphones.  
̈ Match up the notches in the headband to secure the  
headphones for transport.  
̈ Place the headphones flat into the transport case.  
10  
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Cleaning the PXC 250-II  
Cleaning the PXC 250-II  
CAUTION Liquids can damage the electronics of the  
product!  
Liquids entering the housing of the  
product can cause a short-circuit and  
damage the electronics.  
̈ Keep all liquids away from the product.  
̈ Only use a soft, dry cloth to clean the product.  
Replacing the ear pads  
You can replace the ear pads. Replacement ear pads  
are available from your Sennheiser partner or at  
̈ Grasp the edge of the ear pads · and peel them up  
and away from the ear cups.  
̈ Slide the new ear pads · onto the ear cups.  
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Specifications  
Specifications  
Transducer principle  
Ear coupling  
dynamic, closed  
supra-aural  
Frequency response  
10 – 21,000 Hz  
(–10 dB/1 kHz)  
Nominal impedance  
active/passive  
300 Ω/160 Ω  
< 0.1%  
THD at 1 kHz  
Sound pressure level  
112 dB SPL at 1 kHz/1 V  
rms  
Passive attenuation  
–15 dB  
(in the range > 1,200 Hz)  
NoiseGard active noise up to –15 dB  
compensation  
(in the range < 1,000 Hz)  
Audio connector  
In-flight adapter  
3.5 mm jack plug  
3.5 mm double mono  
jack plug  
Cable length  
1.4 m  
Weight w/o  
cable and battery  
approx. 65 g  
NoiseGard power supply 1 AAA size battery, 1.5 V  
Operating time  
with battery  
approx. 50 hours  
Temperature range  
0°C/32°F to 40°C /104°F  
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Manufacturer Declarations  
Manufacturer Declarations  
Warranty  
Sennheiser electronic GmbH & Co. gives a warranty of  
24 months on this product.  
For the current warranty conditions, please visit our web  
partner.  
In compliance with the following requirements  
RoHS Directive (2002/95/EC)  
WEEE Directive (2002/96/EC)  
Battery Directive (2006/66/EC)  
CE Conformity  
EMC Directive (2004/108/EC)  
The declaration is available on the Internet at  
operation, observe the respective country-specific  
regulations.  
Battery  
The supplied battery can be recycled. Please  
dispose of it as special waste or return it to your  
specialist dealer. In order to protect the environ-  
ment, only dispose of exhausted batteries.  
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Manufacturer Declarations  
WEEE Declaration  
Your Sennheiser product was designed and  
manufactured using high-quality materials and  
components, which can be recycled and reused.  
This symbol indicates that electric and electronic  
equipment must be disposed of separately from house-  
hold waste at the end of its operational lifetime.  
Please dispose of this product by taking it to your local  
collection point or recycling center. Please help protect  
our environment.  
Trademarks  
Sennheiser and NoiseGardTM are registered trademarks  
of Sennheiser electronic GmbH & Co. KG.  
In compliance with:  
Europe  
Australia/  
New Zealand  
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Sennheiser electronic GmbH & Co. KG  
Am Labor 1, 30900 Wedemark, Germany  
Publ. 04/11  
542635/A02  
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