The flush mount kit accessory for Crestron® speakers made by Origin Acoustics is compatible with 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
ULTIMATE IC8-DT-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.