One Systems PM4-M V4 - Manual (Page 13)

APPENDIX 2
If the PM4-M is being used with the One Systems 118/HSB the silicone gasket
(supplied with the 118/HSB) must be placed on the surface of the loudspeaker
bracket BEFORE the loudspeaker bracket is attached to the 118/HSB enclosure.
The silicone gasket should be mounted to the surface as noted below.
Mount the silicone gasket (supplied with the 118/HSB) on this surface.
The products referenced in this manual are in conformity with the following
standards or other normative documents: Machinery Directive 2006/42/EC
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