The flush mount kit accessory for Crestron speakers made by Origin Acoustics is compatible with the following Reference and Ultimate speakers:

REFERENCE IC6-W-T-EACH

REFERENCE IC8-W-T-EACH

ULTIMATE IC6-AW-W-T-EACH

ULTIMATE IC6-W-T-EACH

ULTIMATE ICS8-AW-W-T-EACH

ULTIMATE IC8-AW-W-T-EACH

These kits allow for in-ceiling models to be mounted so the room-side surface of the speaker grille is flush with the drywall surface.