Sony A846 - Manual (Page 94)

ModelName: Falcon_E
PartNumber: 4-164-613-11
  Using the Noise Canceling Function
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 You may hear a slight noise when the Noise Canceling function is active. This is
operational noise of the Noise Canceling function and not a malfunction.
 You may feel the Noise Canceling function does not work or noise is louder in a quiet
environment or certain noises may not be canceled as effectively as others. In this case,
release the Noise Canceling function.
 Mobile phones may affect noise. In that case, keep the player away from mobile phones.
 Make sure to remove the headphones from your ears before you connect or disconnect
the headphones from the headphone jack of the player. If the headphones are connected
or disconnected from the player during playback, or while the Noise Canceling function
is active, noise may be generated. This is not a malfunction.
 When the Noise Canceling function is turned on or off, a switching sound will be
generated. This sound is generated by the switch of the Noise Canceling circuit, and is
not a malfunction.