Sony MDR-MV1 Open-Back Reference Monitor Headphones - Manual (Page 114)

Help Guide
Wireless Noise Canceling Gaming Headset/Wireless Gaming Headset
INZONE H9/INZONE H7
The way the audio sounds changes when the noise canceling function is on. (INZONE
H9 only)
Audio may sound different depending on whether the noise canceling function is on or off. If there is a difference, this
can be improved by adjusting the way the headset is worn so that the headset fits snugly over your ears.
Related Topic
Using the noise canceling function (INZONE H9 only)
Wearing the headset
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