How do I get the best transmission
range out of my wireless headphones?
While the overall transmission range
for wireless headphones is mostly determined by the wireless
technology being utilized by the individual wireless
headphone product there are multiple external factors (like
obstacles, audio signal strength, wireless signal congestion,
etc) that can effect the wireless signal transmission range
of wireless headphones. Obstacles are one of the main factors
that can effect the transmission range of the wireless
signal. While the wireless signal (with the exception of
infrared signals) can pass through obstacles (like walls)
ultimately range will be affected (likely reduced) by passing
through these obstacles and the more dense the obstacle the
greater the effect will be on the signal. For example a
signal passing through a glass window won't be affected very
much whereas a signal passing through a concrete wall will be
effected much more greatly. Having a clear line of sight does
provide the best transmission range. The audio signal being
output by your audio source to the transmitter of the
headphones is another key factor in transmission range. A
weaker audio signal going into the transmitter means the
transmitter has a weaker signal to work with which can in
turn reduce the transmission strength which ultimately
affects range. Ensure that your audio source is outputting
the best possible signal for the transmitter to use.
What is Active Noise Cancelling?
Noise cancelling headphones work by
identifying the frequencies of noise outside the headphones
and creating the exact opposite frequencies. The two sets of
frequencies cancel each other out so the brain thinks that no
noise is present. As this happens there will always be a very
low "white noise" effect. This low level "white noise" is
considered to be silent because most people are used to
having back ground noise present in everyday life so often
don't even realize that this "white noise" is present. If
your hearing is very attuned you may be more aware of this
"white noise" however if audio is present in the headphones
then the "white noise" is completely covered over and usually
not detected by the human ear.
How do I know if the wireless
headphones will work on my audio device?
Our Wireless Headphone Systems can be
connected into virtually any audio device and it is just a
matter of identifying the appropriate audio output port and
then having the appropriate connecting plug or component. The
type of connector you have available will depend on the
Sennheiser Wireless Headphone System that you choose. The
type of audio output that you will have available to connect
into will depend on the audio device you are connecting to.
Typical audio output ports include:
- 3.5mm headphone port - red and white RCA audio output
ports - digital audio output (either optical or coaxial)
some instances an adapter or extra component will be needed
to make the appropriate connection.
For example to change a 3.5mm headphone
plug to an RCA connection you would use a female 3.5mm to
male RCA adapter.
For example to change an analog
connection (3.5mm headphone plug or red and white RCA plugs)
to a digital connection (ie: optical) you would use a digital
to analog decoder (like the OREI DA 34).
What do I do when there is wireless
signal (or WiFi) interference?
The wireless headphones that utilize a
digital transmission signal operate in the unlicensed 2.4 Ghz
range as do many other wireless devices (like WiFi routers,
wireless printers, etc) and the headphones have a specific
frequency range on which they can operate. The headphones
scan the local wireless signal environment and then
automatically select an unused frequency within their
designated range. The headphones are designed to work in
conjunction with other wireless devices without the different
devices interfering with each other. Typically the bandwidth
of the WiFi router is greater than that of the headphones and
it actually encompasses the bandwidth that the headphones
want to use. Most of the time the two signals are away from
each other and there is no issue. Occasionally if the WiFi
router has established it's signal in the bandwidth that the
headphones want to use then the two signals butt up against
each other this can cause issues. Sometimes it is possible to
change the WiFi router frequency manually by using a switch
on the router itself.
In situations where the WiFi router
cannot be changed manually the simple solution is to turn off
the headphones and the WiFi router. Start the headphones and
let them run for 15 minutes to establish their signal and
then turn on the WiFi router. The WiFi router will "see" the
signal of the headphones and establish it's own signal in a
different part of the bandwidth and the two devices will work
without interfering with each other. NOTE: Once this process
has been done the signals are established and will remain
established even with a device is turned off.
If the above solution does not resolve the issue it may be a situation where the wireless environment is too crowded and the multiple wireless signals keep butting up against each other and causing issues. To resolve this some wireless signals would need to be removed from the environment (ie: turned off). For example if a wireless printer was turned on it is creating wireless signal that would be part of the wireless signal congestion. If the printer is not used all the time then it could be turned off to reduce the congestion and allow the other wireless devices (like the headphones) to work.
What is NoiseGard™?
Flying can be particularly tiring, as
passengers on board of a plane are often exposed to a
continuous noise level of up to 80 dB/SPL. And on board of a
train it can sometimes become loud as well. Sennheiser's
patented NoiseGard™ technology makes travelling as relaxed as
possible by letting you enjoy music in peace. The innovative
NoiseGard™ /digital system now offers travelers a choice of
three noise cancelling profiles – optimized for the different
types of surrounding noise encountered while travelling.
Active noise cancellation: the idea is
based on the physical principle of noise and anti-noise,
which was researched for the first time by the physicist Paul
Lueg in the early 1930s. Put simply, an artificially
generated sound field that is phase-inverted to the sound
field of the noise has the effect of cancelling out the
unwanted noise. Sennheiser’s NoiseGard™ technology works as
follows: miniature microphones integrated into the headphones
pick up the low-frequency noise close to the ears.
Sophisticated electronic circuitry calculates a sound wave
that is phase-inverted by 180 degrees to the unwanted noise.
Directly at the ear, the noise and anti-noise cancel each
other out almost completely. As a result, particularly
annoying low-frequency noise is dramatically reduced.
What means NFC™ Near Field
Near-field communication (NFC) is a set
of communication protocols that enable two electronic
devices, one of which is usually a portable device such as a
smartphone, to establish communication by bringing them
within 4 cm (1.6 in) of each other.
NFC devices are used in contactless
payment systems, similar to those used in credit cards and
electronic ticket smartcards and allow mobile payment to
replace/supplement these systems. NFC-enabled devices can act
as electronic identity documents and keycards. NFC offers a
low-speed connection with simple setup that can be used to
bootstrap more capable wireless connections.