Figure 3: Closed-Back Ceiling Speaker Schematic Diagram - Kramer Galil 4-C User Manual

Each Closed-back Ceiling speaker is supported by a C-ring and two tile rails. The tile
rails prevent the speakers from falling if the tile itself comes out or falls apart, as
their ends catch onto the T-grid. When mounting onto the ceiling tiles, use both
supports. When mounting onto a sheetrock ceiling, the C-ring alone is used to
reinforce the ceiling material.
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Figure 3 shows a schematic diagram of the Closed-back ceiling speaker:

Figure 3: Closed-back Ceiling Speaker Schematic Diagram

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Be sure that the tiles can support the speaker. Smaller sized tiles or
fiberglass-type tiles cannot support the weight of the speakers.
When this is the case, the speakers will need additional support.
Galil 4-C Your Galil 4-C Closed-back Ceiling Speaker