Accruepole Private Limited

The LBB1935/20 is a powerful 240 W power amplifier in a 2U high 19” case for rack mounting or tabletop use. LEDs on the front panel show the status of the amplifier: power, audio output level, and supervised functions. This high-performance unit fulfils a wide range of public address requirements at a surprisingly low cost.

battery status can be switched off for general public address use. Failsafe (normally energized) relays are provided for each supervised function. These relays are always active regardless of the switches on the rear panel.

Input The amplifier has two balanced inputs with priority control, each with a loop‑through facility. This makes it easy to connect remote systems that require priority control. An additional 100 V line input is provided to connect the amplifier to a 100 V loudspeaker line to provide more power to remote locations.

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Bosch offers a diverse range of ceiling speakers designed for public address (PA) systems in commercial, public, and industrial environments. They are engineered to provide clear and reliable audio for announcements, background music, and voice evacuation systems. 

Manual Emergency Broadcast • One-click Broadcast • Zone/group Broadcast • Audio Prerecord & Broadcast • Play Audio Files from USB Disk • Internal Communication • Automatic Record • Microphone and Network Supervision • Log Function

The LBD3903-x is a 12W, general-purpose, cost effective loudspeaker for indoor use. Keyholes at the rear are provided for quick and easy wall mounting. The angled front baffle results in a better sound in the listening area. The cabinet is available in black or white.


The robust, solid MDF (Medium Density Fiber board) enclosures are covered with a durable, easy-to-clean vinyl in white or black. The ABS fronts are covered with fine woven cloth in matching color. The loudspeaker has been tested for operation at rated power for 100 hours in accordance with IEC 268-5 Power Handling Capacity (PHC) standards. 

Buttons for special operations: select all, reset, error confirm and etc. Zone selection buttons Audio source selection buttons Emergency mode button.

8 dry-contact outputs 4 noise detector inputs 8 loudspeaker line outputs

The LBB1990/00 Voice Alarm Controller unit is the heart of the Plena Voice Alarm System. It is the basis of the Plena Voice Alarm System, and has all the essential functionality for compliance with the EN 54‑16 standard, including full system supervision, loudspeaker line impedance supervision, a supervised emergency microphone on the front panel and a supervised message manager. The messages can be merged to allow even more flexible use of pre‑recorded announcements and evacuation messages. The controller can be used as a stand‑alone system with up to six zones, or expanded to up to 120 zones using additional six‑zone routers. Up to eight call stations can be connected. Interconnections are made using standard RJ45 connectors and shielded CAT-5 cable. A built‑in 240 W amplifier provides the power for the emergency call channel and BGM. Additional amplifiers can be added to provide two‑channel operation. All amplifiers are supervised. The audio output uses standard analog audio 100 V line switching for full compatibility with the product family of public address equipment and Bosch EVAC-compliant loudspeakers. The system is configured using DIP switches for basic functionality and a PC for more advanced functions.