Yamaha NS-SW310 - Manual (Page 6)

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After unpacking, check that the following parts are
contained.
To enjoy the high sound quality, stabilize the subwoofer
using the non-skid pads.
Attach the provided non-skid pads in the four corners of the
underside of the subwoofer to prevent the subwoofer from
moving as a result of vibration, etc.
SUPPLIED ACCESSORIES
Non-skid pads
ATTACHING THE NON-
SKID PADS