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3. Intelligent Features
3.1 Adaptive Noise Cancellation
Noise cancellation is a series of advanced
technologies that aids in removing undesired noise
from the surrounding environment.
PI4 features our latest innovations in adaptive noise
cancellation, this includes intelligent sensing that
adapts noise cancellation and tuning best suited to
your surrounding environment. As your surroundings
change, noise cancellation will auto adapt to
complement your new environment.
The Noise Cancellation button on the left control unit
is used to cycle between the following modes, see
Diagram 2 for button location:
Mode
Application
High
Suitable for consistently noisy
environments such in an airplane cabin.
Low
Suitable for environments where you
need awareness of your surroundings.
Auto
Intelligently adapts noise cancellation
best suited to your current environment.
Off
Turns off the noise cancellation feature.
3.2 Ambient Pass-Through
PI4 features Ambient Pass-Through which lets some
external noise from the surrounding environment,
such as safety announcements or conversations, to
be heard without taking the headphones off.
The Noise Cancellation button on the left control unit
also controls this feature, see Diagram 2 for button
location.
Function
Action
Enable ambient
pass-through
Press and hold the Noise
Cancellation button for
2 seconds.
Disable ambient
pass-through
With ambient pass-through
enabled, either hold down
or single press the Noise
Cancellation button for 2
seconds, the headphones will
return to the previous noise
cancellation mode
The level of ambient pass-through can be further
customised to suite your needs using the
Bowers & Wilkins Headphones App.
3.3 Magnetic Clip Sensors
PI4 incorporate magnetic clip sensors in the
earpieces, enabling intelligent battery conservation
by entering standby when clipped together. When
unclipped again, PI4 automatically wakes and
connects to the last connected Bluetooth device.
During media playback, PI4 will auto pause when
both earpieces are clipped together. If unclipped
before standby, playback will automatically resume.
Auto resume has also been optimised so it is ready
only when you are. This means the headphone will
not attempt to resume playback during following
conditions:
1. Headphone powers on from the off state.
2. Headphone wakes from the standby state.
3. Headphone reboots (such as after a
factory reset).
Magnetic sensors and standby can be adjusted
using the Bowers & Wilkins Headphones App.
Magnetic clip sensors
Diagram 4
Magnetic clip sensor location
