Sony NW-A25 How To Use Manual page 234

Help Guide
function of your Walkman is enabled. Release the HOLD function
before touching the devices together to make a one-touch connection.
One-touch connections (NFC) cannot be made while your Walkman is
in standby mode and the screen is off. Turn the screen on before
touching the devices together to make a one-touch connection.
[292] Troubleshooting
The noise canceling function is not effective.
Make sure the noise canceling function is enabled.
The noise canceling function is available only with noise canceling
headphones. The noise canceling headphones that are compatible
with this product are MDR-NW750N/MDR-NW750NE.
Make sure the headphones you use are selected in the [Select
Headphones] setting.
Make sure the headphones fit your ears snugly by means such as
changing the size of the earbuds or adjusting the earbud position. If
you change the size of earbuds, attach them firmly on the headphones
to prevent them from detaching and remaining in your ears.
The noise canceling function is not adjusted appropriately. Your
Walkman is preset to maximize the effect of noise canceling. However,
you may attain more effectiveness by raising or lowering the sensitivity
of the microphone built in to the supplied headphones. See "Adjusting
noise canceling."
The noise canceling effect may not be noticeable in a quiet place or
with some types of ambient noise.
The type of environment set in [Select NC Environment] may not be
suitable for the surrounding environment. Set [Select NC Environment]
according to the surrounding environment.
[293] Troubleshooting
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Q&A Noise Canceling
Q&A Noise Canceling
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08/06/16 16:25