On top of the mounting ring, provisions are present to “click-on” the optional Back Box. The combination of Mounting Ring and Back Box prevents sound traveling via the ceiling cavity to adjacent areas, and fully protects the loudspeaker from dust, falling objects. The Back Box has knock-out holes for two grommets (11 mm/0.80 in) and for two cable glands (20.5 mm/ 0.80 in).
Protects rear of the loudspeaker from dust and dripping water
Makes unit vermin proof
Prevents sound traveling via ceiling cavity to adjacent areas
