Bosch LB1-UM50E 50W Premium-Sound Cabinet Loudspeaker

Bosch LB1-UM50E Overview

The Bosch LB1-UM50E is a professional 50W premium-sound cabinet loudspeaker designed for high-quality speech, background music, foreground music, and voice-alarm applications. With support for 8-ohm, 70V, and 100V audio systems, the LB1-UM50E provides flexible installation options for commercial and professional sound systems.

Featuring a durable metal cabinet, IP65 water and dust protection, and EN 54-24 certification, the Bosch LB1-UM50E is designed for reliable indoor and outdoor use where clear audio reproduction and dependable performance are essential.

Bosch LB1-UM50E Key Features

• 50W rated power
• 75W maximum power
• Premium-sound cabinet loudspeaker
• Professional two-way speaker design
• 8-ohm, 70V and 100V operation
• Selectable 50W / 25W / 12.5W / 6.25W power taps
• 90 Hz–20 kHz effective frequency range
• 91 dB sensitivity at 1W/1m
• Up to 108 dB SPL at rated power
• EN 54-24 certified
• Type B loudspeaker for voice alarm systems
• IP65 protection
• Durable aluminum extruded cabinet
• Aluminum front grille
• ABS top and bottom sections
• Wide horizontal sound coverage
• Wall mounting bracket included
• Suitable for indoor and outdoor installations
• Available in White RAL 9010 and Charcoal RAL 7021
• Operating temperature from -25°C to +55°C
• Suitable for speech, background music, foreground music, and voice alarm applications

Premium Two-Way Speaker Design

The LB1-UM50E uses a two-way loudspeaker design engineered for clear speech and quality music reproduction. The speaker provides a sensitivity of 91 dB at 1W/1m and can deliver up to 108 dB SPL at rated power, providing strong output for commercial environments.

Its wide 90 Hz–20 kHz frequency range helps reproduce both speech and music with good clarity and detail.

50W Power with Flexible Power Taps

The Bosch LB1-UM50E provides 50W rated power and 75W maximum power. Installers can select from multiple transformer power settings:

• 50W
• 25W
• 12.5W
• 6.25W
• This flexibility makes it easier to match the speaker output to different room sizes and distributed audio system requirements.

Powerful 50W Audio Performance

The Bosch LB1-UM50E delivers 50W rated power with a 75W maximum power rating, providing strong and clear sound for larger commercial and professional audio environments. Its effective frequency range of 90 Hz to 20 kHz supports clear speech and detailed music reproduction.

Flexible 8 Ohm, 70V and 100V Operation

The LB1-UM50E can be integrated into different professional audio systems with 8-ohm, 70V, or 100V operation. Selectable power taps of 50W, 25W, 12.5W, and 6.25W allow installers to match the speaker output to the

EN 54-24 Certified Voice Alarm Speaker

One of the key advantages of the Bosch LB1-UM50E is its EN 54-24 certification. Bosch documentation identifies the LB1-UM50E as a Type B loudspeaker for voice alarm systems used with fire detection and fire alarm systems in buildings.

This makes it suitable for applications where certified voice alarm loudspeakers are required, subject to the requirements of the overall system and local regulations.

Durable Metal Cabinet Construction

The LB1-UM50E features a durable aluminum extruded enclosure with an aluminum front grille and ABS top and bottom sections. This construction provides a professional appearance while supporting reliable operation in commercial installations.

The speaker is available in white RAL 9010 or charcoal RAL 7021, allowing it to blend into different architectural environments

IP65 Protection for Indoor and Outdoor Applications

The LB1-UM50E is designed for indoor and outdoor use and provides IP65 environmental protection. This makes it suitable for installations where the loudspeaker may be exposed to dust and water.

Its operating temperature range is approximately -25°C to +55°C (-13°F to +131°F).

Included Wall Mounting Bracket

The Bosch LB1-UM50E is supplied with a wall mounting bracket, allowing installers to position the speaker for the desired sound coverage. The mounting design is suitable for professional fixed-installation applications.

Recommended Applications

The Bosch LB1-UM50E is suitable for a variety of professional audio environments, including:

• Commercial PA systems
• Voice alarm and evacuation systems
• Fire alarm voice communication systems
• Background music installations
• Foreground music applications
• Retail stores and shopping centers
• Hotels and hospitality venues
• Offices and commercial buildings
• Educational institutions
• Industrial facilities
• Public buildings
• Indoor and outdoor commercial spaces

Why Choose the Bosch LB1-UM50E?

The Bosch LB1-UM50E 50W Cabinet Loudspeaker combines powerful audio performance, flexible 8-ohm/70V/100V connectivity, durable metal construction, IP65 protection, and EN 54-24 certification in one professional loudspeaker.

It is particularly well suited for installations requiring both high-quality music and clear speech, as well as professional voice alarm applications. Its multiple power taps and included wall bracket provide installers with flexibility when designing and deploying commercial sound systems.