Description

The Bosch LC4-CBB Back Box protects the rear of the loudspeaker from dust, falling objects, makes the unit vermin proof and prevents sound traveling via the ceiling cavity to adjacent areas. The Bosch LC4-CBB back‑box is assembled with the loudspeaker by means of a snap‑in construction and has knock‑out holes for two grommets (11.5mm) and for two cable glands (20.5mm) aside and on the top.

The LC4 range is very installation friendly. A cutting template is supplied with each unit, and the loudspeaker is secured in ceilings up to 50mm (2in)
thick using two integral screw driven clamps. Connections are made using a screw terminal block on the frame, where each incoming and outgoing conductor of the same potential can be connected to a separate screw on a terminal block. Power tapping on both 70V and 100V allows selection of full‑power, half‑power, quarter‑power, eight‑power radiation and 8 Ohm. A selector at the front of the frame simplifies the required selection of the power setting. The loudspeaker grille, standard supplied, can be secured to the loudspeaker unit with a quick bayonet fitting after installation of the loudspeaker into the ceiling.

Ease of installation for individual loudspeaker and loudspeaker / fire‑dome combinations. The metal fire‑dome (LC4‑MFD) mounting is fixed in the ceiling
prior to the ceiling speaker mounting. The fire‑dome is provided with a safety cord allowing the installer to temporarily hang the loudspeaker in the fire‑dome, while connecting. Connections are made using an innovative ceramic screw terminal connector on top of the metal fire‑dome with loop‑through facility. The loudspeaker has a provision also for adding a capacitor in case the loudspeaker is used in systems with DC supervision.