BMT95-4 Blind Mount 4" Enclosure 5" Deep by
Atlas Soundis a 4" Blind-Mount enclosure system ( U.S. Patent # 4,673,149 ) that gives an easy and cost-effective alternative for secure loudspeaker installation in retrofit ceiling applications.
All the needed hardware is provided including a unique support system with mounting ears that telescope out from inside the enclosure and adjust vertically to accommodate ceilings with a thickness of 1/2" to 1 3/8" . Each units features CRS construction and include torsion-spring receptacles for quick mounting of torsion-spring grilles. (J-Nuts are also included on the return of the enclosure to accommodate surface-mounting grilles.)
There are enclosure backplates are manufactured to allow cable access with three 1/2" conduit knockouts. Enclosure is also equipped with sound damping material to minimize metallic resonance.