Sennheiser ACCENTUM Over-Ear Wireless Headphones (Black) - Manual (Page 23)

Using the headphones
ACCENTUM | 23
Information on active noise cancellation
ANC
Due to its closed design, the headphones offer effective passive iso-
lation from ambient noise.
In addition, the headphones have an active noise cancellation (ANC)
function, which allows you to reduce ambient noise to a minimum.
Even with ANC, the sound quality of your headphones is always at its
best.
If you want to create a quiet space in a noisy environment, you can
simply use the headphones – without connected cables and without
Bluetooth devices – as noise protection by using ANC (> 25).
Notes on active noise cancellation
• Continuous and low-frequency noise, such as motor or fan noise,
is particularly well suppressed.
• Speech or high-frequency noise is significantly reduced, but can
remain perceptible.
• In very quiet environments, slight noise may occur.
• If unusual (whistling or beeping) noise occurs, take the head-
phones off and put them on again. Make sure that the ear cups
properly fit around your ears.
• To avoid loud, unusual (whistling or beeping) noise and to ensure
proper noise cancellation, do not cover the microphone openings
of the active noise cancellation circuitry located on the outside of
the ear cups.