Sony WI-C600N Help Manual page 111

Help Guide
Wireless Noise Canceling Stereo Headset
WI-C600N
There is a difference in volume between the left and right sides, insufficient low-
frequency sound.
Size M earbuds come attached to the left and right sides of the headset at the time of purchase. If you feel that there
is insufficient low frequency sound and a difference in volume between the left and right sides, change the earbuds to
another size to comfortably and snugly fit your left and right ears.
Related Topic
Replacing the earbuds
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