Bosch LB1-UM20E-L – Cabinet loudspeaker, 20W, white

Bosch LB1-UM20E-L Overview

The Bosch LB1-UM20E-L is a premium-sound 20W cabinet loudspeaker designed for high-quality speech, foreground music, background music, paging, and voice alarm applications. With a durable aluminum enclosure, two-way speaker design, adjustable wall-mounting bracket, and 70V/100V line operation, this white Bosch cabinet speaker is an excellent choice for professional public address and commercial audio installations.

The LB1-UM20E-L delivers clear and detailed audio across an effective 90 Hz to 20 kHz frequency range. Its 20W rated power can be configured using selectable 20W, 10W, 5W, and 2.5W power taps, providing flexibility for different distributed audio system requirements.

Key Features

• 20W rated power and 30W maximum power
• 70V and 100V line compatible
• Selectable power taps: 20W / 10W / 5W / 2.5W
• Premium-quality two-way speaker system
• High-fidelity speech and music reproduction
• Effective frequency range of 90 Hz – 20 kHz
• Sound pressure level of 101 dB at rated power / 88 dB at 1W, 1m
• Wide horizontal and vertical coverage
• Durable aluminum enclosure
• White RAL 9010 finish
• Supplied with an adjustable wall-mounting bracket
• Self-restoring overload protection
• EN 54-24 certified for voice alarm applications
• Suitable for indoor and selected outdoor professional audio applications

Premium Sound for Speech and Music

The Bosch LB1-UM20E-L is engineered to provide clear reproduction of both speech and music. Its two-way design combines a 5-inch woofer with a 1-inch dome tweeter, helping deliver balanced audio for paging, announcements, background music, and foreground music applications.

With an effective frequency response from 90 Hz to 20 kHz, the speaker is suitable for applications where clear voice reproduction and quality music playback are important.

Flexible 70V/100V PA System Integration

The Bosch LB1-UM20E-L 20W speaker supports professional distributed audio systems using 70V and 100V line technology. Its selectable transformer taps allow installers to choose the appropriate power level according to the size and requirements of the sound system.

Available power taps are

• 20W
• 10W
• 5W
• 2.5W

The speaker also supports an 8-ohm input configuration, providing additional installation flexibility.

EN 54-24 Voice Alarm Speaker

The LB1-UM20E-L is EN 54-24 certified and designed for use in voice alarm systems where compliant professional public address equipment is required. Built-in protection helps maintain system integrity in demanding applications.

Applications

The Bosch LB1-UM20E-L is suitable for a wide range of commercial and professional audio applications, including:

• Public address (PA) systems
• Voice alarm and emergency voice evacuation systems
• Offices and boardrooms
• Restaurants and hotels
• Retail stores and shopping areas
• Gyms and fitness centers
• Exhibition halls
• Theme parks and entertainment venues
• Background music systems
• Paging and announcement systems
• Commercial and institutional buildings

Durable Wall-Mount Cabinet Design

The speaker features an aluminum enclosure with a white finish and includes an adjustable wall-mounting bracket, making it suitable for permanent wall-mounted installations. Its professional appearance allows it to integrate easily into commercial environments where both audio performance and aesthetics are important.