The Bose® 102®F commercial loudspeaker is engineered for true high-fidelity performance as part of a distributed sound system. It incorporates a BOSE® 4.5-inch (11.4 cm) HVC (Helical Voice Coil) full-range driver in a dual-ported enclosure. The 102® flush-mount speaker can be installed in ceilings and standard studded walls.