Bosch LBB4442/00 Line Supervision Set - Loudspeaker Line Monitoring, 100V/70V

Monitor your loudspeaker lines for faults without running any extra cabling using the Bosch LBB4442/00 Line Supervision Set. Designed for public address and voice alarm systems, this set continuously checks the integrity of your loudspeaker line and flags open-circuit faults, so problems like a cut cable or disconnected speaker don't go unnoticed until it's too late.

The set works as a master-and-slave pair: the supervision-master mounts inside the power amplifier, while the supervision-slave is fitted at the far end of the loudspeaker line and draws its power directly from the amplifier. Because monitoring happens over the existing speaker wiring, there's no need to install a separate supervision cable run alongside it.

Key features

• Loudspeaker line monitoring without additional cabling
• Supervision-master mounts inside the power amplifier
• Supervision-slave mounts at the end of the loudspeaker line
• Detects open-circuit line faults
• Compatible with both 100V and 70V loudspeaker lines
• Supervision-slave is powered from the power amplifier itself

Ideal for

• Public address and voice alarm systems requiring line integrity checks
• Commercial and life-safety audio installations
• Sites wanting fault detection without rewiring existing speaker lines
• Installers standardising on 100V or 70V distributed audio systems

Good to know

Because the supervision-slave draws power from the amplifier via the loudspeaker line itself, installation is considerably simpler than running a dedicated monitoring cable to the far end of a distributed speaker system, making this a practical retrofit option as well as a new-build component.