Cambridge SoundWorks MC650-IW - Manual (Page 9)

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Speaker Mounting (continued)
After making the wire connection, carefully insert the speaker into the
cutout by first angling in one side so that the wall is sandwiched between
the aluminum clamp rail and the front bezel. Maneuver the other side clamp
through the hole and center the speaker within the cutout. Tighten the clamp
screws firmly using a Phillips head screwdriver.
As you tighten the clamp screws, the aluminum clamp rails will secure the
speaker as shown in the above drawings.
A
Vertical Installation Example
Screwdriver
Grille