The Model dmc1FB Combination Mounting Frame (Black) is used in new and retrofit intercom installations. The frame is designed to fit a dmc1B or dmc3-4B Music/Communication System Master and dmc1CDB Add-on 6-disc CD Changer.
In new installations, use the dmc1F combination frame when installing a dmc1B with a dmc1CDB below the master.
In retrofit installations, use the dmc1F combination frame when replacing a master only system with a dmc3-4B or dmc1B and a dmc1CDB below the master. NOTE: The wall hole will need to be enlarged for this type of retrofit installation.