The Bosch LB1-UM Series Metal Cabinet Loudspeakers are the premier choice for professional audio environments where high-fidelity sound must be paired with extreme durability. Engineered with a robust aluminum enclosure, these 20W speakers (LB1-UM20E-D/L) are designed for locations that require superior speech intelligibility and high-quality background music (BGM), such as transportation hubs, government buildings, and luxury retail malls.
At ChoiceCycle, we recommend the LB1-UM series for clients who prioritize long-term reliability and safety. These units are not only built to deliver “Prosound” performance but are also fully certified for Voice Alarm (EVAC) applications, making them a critical component of your facility’s life-safety infrastructure in Singapore.
Technical Deep-Dive: The Metal Advantage
The LB1-UM series stands out by utilizing a high-grade aluminum enclosure combined with professional-tier driver technology to ensure sound remains crisp even in acoustically challenging spaces.
1. Two-Way Audiophile Driver System
Unlike standard single-cone speakers, the LB1-UM20E features a sophisticated two-way system:
High-Performance Woofer: A dedicated driver handles low and mid-range frequencies, providing the warmth and depth needed for premium music playback.
Silk Dome Tweeter: A specialized tweeter handles high frequencies, ensuring that every syllable of an announcement is heard with absolute clarity.
Wide Frequency Response: With a range of 80 Hz to 20 kHz, these speakers provide a full-spectrum audio experience that is equally suited for foreground music and critical paging.
2. Extreme Durability & Weatherproofing
Robust Aluminum Build: The extruded aluminum housing and grilles are finished with a high-quality coating, providing a sleek, modern look that is resistant to physical impacts and environmental wear.
Semi-Outdoor Capability: These units are designed to withstand humid and dusty environments, making them ideal for Singapore’s transition zones like sheltered walkways, airport terminals, and semi-open concourses.
3. Professional Installation & Safety
Swivel Mounting Bracket: Every unit comes with a heavy-duty, adjustable swivel bracket, allowing ChoiceCycle technicians to precisely aim the sound at the target audience.
Built-in Safety Features: The “E” version includes a ceramic terminal block, a thermal fuse, and heat-resistant internal wiring. These features ensure the speaker line remains intact during a fire, preventing a single failure from disabling the entire evacuation loop.
2026 Standards: EVAC & Voice Alarm Compliance
In 2026, compliance with international safety codes is the highest priority for commercial infrastructure. The LB1-UM series is purpose-built for emergency readiness.
EN 54-24 Certified: Fully compliant with European standards for Voice Alarm loudspeakers, ensuring they perform reliably during emergency broadcasts.
BS 5839-8 & EN 60849 Ready: Designed to integrate seamlessly into large-scale emergency evacuation systems (EVAC), providing the high speech intelligibility required for life-safety instructions.
100-Hour PHC Test: Bosch guarantees these units can run at full 20W power for 100 continuous hours without failure, meeting the rigorous IEC 60268-5 standards.
ChoiceCycle: Precision Engineering & Local Support
At ChoiceCycle, we ensure that your Bosch LB1-UM system is installed to meet both aesthetic and regulatory standards:
Acoustic Mapping: We calculate the optimal tilt and placement of the swivel brackets to ensure uniform sound pressure and high intelligibility in every corner of your facility.
Emergency Loop Integration: Our technicians specialize in wiring high-security EVAC loops, ensuring the ceramic terminals and thermal fuses are correctly commissioned for maximum safety.
Sim Lim Square Hub: Based at Sim Lim Square, ChoiceCycle provides immediate access to both Charcoal (-D) and White (-L) variants, backed by local technical support and a comprehensive manufacturer’s warranty.
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Technical Summary Table
| Feature | Specification Details (LB1-UM20E-D/L) |
| Rated Power (PHC) | 20 Watts |
| Max Power Output | 30 Watts |
| Sound Pressure (1kHz, 1m) | 101 dB (SPL) |
| Frequency Range (-10dB) | 80 Hz to 20 kHz |
| Opening Angle (1kHz/4kHz) | 174° / 95° (Horiz) |
| Input Voltage | 100V / 70V / 8 Ohm |
| Protection Rating | EN 54-24 / IP 32 |
| Weight | Approx. 2.72 kg |
Contact Us – Choicecycle (SGCCTV Singapore)
📍 Store: SGCCTV Choicecycle
Sim Lim Square #02-81, Singapore
📞 WhatsApp: +65 9853 4404
📧 Email: enquiry@choicecycle.com.sg
🌐 Website: https://sgcctv.com.sg
🕒 Operating Hours: 11 AM – 8 PM (Daily)
The Bosch LB1-UM Series Metal Cabinet Loudspeakers are meticulously engineered for elite commercial and industrial environments where standard plastic enclosures fall short. Available in the 20W (LB1-UM20E) configuration, these units combine a sophisticated two-way audio engine with a ruggedized aluminum body, making them the preferred choice for high-traffic Singaporean hubs like MRT stations, airports, and luxury shopping gallerias.
At ChoiceCycle, we specialize in the deployment of the LB1-UM series for high-security projects. Because these units are EN 54-24 certified, they serve a dual purpose: providing premium-grade background music during daily operations and functioning as mission-critical life-safety speakers during emergency evacuations.
Technical Masterclass: The Aluminum Advantage
The LB1-UM series is distinguished by its material choice and internal acoustic architecture, ensuring it maintains clarity in acoustically difficult environments.
1. Audiophile-Grade Two-Way System
While most industrial speakers rely on a single driver, the LB1-UM20E utilizes a dedicated woofer and tweeter:
High-Excursion Woofer: Delivers rich, natural bass and mid-tones, ensuring that background music sounds full and professional.
Dome Tweeter Precision: Handles frequencies up to 20 kHz, providing the high-end “sparkle” needed for modern music and the sharpness required for clear vocal announcements.
Balanced Crossover: An internal frequency-splitting network ensures each driver handles its optimal range, preventing distortion even at high volume levels.
2. Ruggedized for Industrial Life
Extruded Aluminum Enclosure: The high-grade aluminum housing and front grille are designed to resist impact and environmental corrosion. This is particularly valuable in semi-outdoor or coastal environments in Singapore.
Aesthetic Excellence: Finished in Charcoal (-D) or White (-L), the sleek, extruded profile allows the speaker to blend into contemporary architectural designs while appearing significantly more premium than standard plastic cabinets.
3. Strategic Sound Dispersion
Adjustable Swivel Bracket: Every unit is supplied with a robust, versatile swivel mounting bracket. This allows ChoiceCycle technicians to tilt and turn the speaker to precisely target “sweet spots” on the floor, minimizing acoustic reflections off walls and ceilings.
High Sound Pressure Level (SPL): With a rated SPL of 101 dB, these speakers can cut through significant ambient noise, making them ideal for busy concourses and industrial workspaces.
2026 Safety & EVAC Compliance
In 2026, the integration of security and safety is non-negotiable. The LB1-UM20E is engineered for 100% emergency reliability.
EN 54-24 Certified: These speakers meet the strict European standards for Voice Alarm systems, ensuring they remain operational and intelligible during fire emergencies.
Ceramic Terminal Blocks: Features heat-resistant ceramic connectors and a thermal fuse. In the event of a localized fire, these components prevent the speaker from short-circuiting the entire emergency loop, ensuring other speakers in the building keep working.
Supervision Ready: Designed for seamless integration with Bosch Praesideo and Paviro systems, allowing for real-time monitoring of each speaker’s health.
Professional Commissioning by ChoiceCycle
At ChoiceCycle, we leverage our Sim Lim Square technical hub to provide a flawless installation for your Bosch LB1-UM system:
Acoustic Zone Tuning: We calibrate the multi-tap transformer (20W, 10W, 5W, or 2.5W) to ensure balanced audio coverage across your facility.
Safety Loop Validation: Our technicians perform rigorous impedance and continuity testing on the emergency speaker lines to ensure 100% SCDF and safety compliance.
Local Hub Advantage: Based at Sim Lim Square, ChoiceCycle provides immediate stock, local technical support, and the peace of mind of an authorized Bosch warranty.
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Technical Summary Table
| Feature | LB1-UM20E-D/L Specifications |
| Rated Power (PHC) | 20 Watts |
| Input Selection | 100V, 70V, or 8 Ohm |
| Frequency Range (-10dB) | 80 Hz to 20 kHz |
| Sound Pressure (1W/1m) | 88 dB (SPL) |
| Safety Certification | EN 54-24 / BS 5839-8 |
| Protection Rating | IP 32 (Drip-proof) |
| Operating Temp | -25 °C to +55 °C |
| Dimensions (HxWxD) | 274 x 160 x 180 mm |
| Weight | Approx. 3.88 kg (with bracket) |
Contact Us – Choicecycle (SGCCTV Singapore)
📍 Store: SGCCTV Choicecycle
Sim Lim Square #02-81, Singapore
📞 WhatsApp: +65 9853 4404
📧 Email: enquiry@choicecycle.com.sg
🌐 Website: https://sgcctv.com.sg
🕒 Operating Hours: 11 AM – 8 PM (Daily)
The Bosch LB1-UM Series Metal Cabinet Loudspeakers are the definitive solution for high-traffic environments where audio performance must be matched by a “zero-failure” physical build. The LB1-UM20E is specifically engineered to handle the acoustic challenges of large, reflective spaces—such as airport terminals, glass-heavy corporate lobbies, and outdoor transit concourses—while maintaining the sleek aesthetic of modern architecture.
At ChoiceCycle, we view the LB1-UM series as a critical asset for infrastructure projects. Its aluminum construction provides the thermal and physical resilience required for Singapore’s most demanding sites, ensuring that your public address system remains functional even under extreme environmental stress.
Technical Deep-Dive: The Engineering of Clarity
The LB1-UM20E is a “Prosound” device hidden within an industrial-grade shell. Its internal components are designed to deliver high-resolution audio over long distances.
1. Precision Two-Way Audio Engine
While many industrial speakers sacrifice musicality for volume, the LB1-UM20E maintains a high-fidelity profile:
Dedicated High-Excursion Woofer: Optimized for mid-bass punch, providing the “body” required for professional background music.
Silk-Dome Tweeter: A high-frequency specialist that extends the range to 20 kHz, ensuring that consonants in speech (the key to intelligibility) are never lost in a noisy crowd.
Integrated Crossover: A high-order filter network that ensures a seamless transition between the drivers, preventing the “muddiness” common in cheaper single-cone cabinets.
2. Extruded Aluminum Resilience
The choice of material is not just for looks; it is a functional necessity for professional durability.
High-Impact Protection: The extruded aluminum housing is significantly more resistant to accidental impact and vandalism than plastic alternatives.
Corrosion Resistance: The specialized powder coating and aluminum substrate make these units ideal for semi-outdoor transition zones where humidity and salt air are present.
Modern Profile: Available in Charcoal (-D) and White (-L), the sleek finish allows the unit to blend into high-end interior designs, from luxury showrooms to government offices.
3. Versatile Mounting & Alignment
Universal Swivel Bracket: Every speaker is supplied with a heavy-duty adjustable bracket. ChoiceCycle technicians use this to “aim” the sound precisely, ensuring uniform coverage while minimizing reflections off hard surfaces like marble floors or glass walls.
Multi-Tap Power Selection: A rotary switch on the rear (or internal wire tapping) allows for instant selection between 20W, 10W, 5W, and 2.5W modes, ensuring the system is balanced for the specific acoustics of the room.
2026 Standards: Mission-Critical Safety
In 2026, the LB1-UM20E serves as the frontline of your facility’s safety strategy. It is fully optimized for Life-Safety and EVAC requirements.
EN 54-24 Certification: Strictly certified for use in Voice Alarm systems, guaranteeing that the speaker will function exactly as intended during fire emergencies.
Fire-Safe Connectivity: Equipped with heat-resistant ceramic terminal blocks and a thermal fuse. These ensure that if a fire reaches the speaker, the internal wiring will fail safely without short-circuiting the rest of the speaker loop.
Total System Visibility: These units are designed to work with Bosch Praesideo and Paviro supervision modules, providing 24/7 digital health monitoring of the speaker’s voice coil and line integrity.
Professional Integration by ChoiceCycle
At ChoiceCycle, we specialize in high-spec audio deployments. Our service for the LB1-UM series includes:
Acoustic Simulation: We use mapping tools to determine the precise tilt and power tapping needed to achieve a high Speech Transmission Index (STI) score for your building.
Safety Compliance Audits: We ensure all cabinet mountings and safety loop connections meet SCDF and international building code standards.
Local Technical Hub: Based at Sim Lim Square, ChoiceCycle provides immediate stock, professional onsite calibration, and the security of a local authorized Bosch warranty.
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Technical Summary Table
| Feature | LB1-UM20E-D / L Specifications |
| Rated Power (PHC) | 20 Watts |
| Speaker Type | Two-way (Woofer + Tweeter) |
| Max Sound Pressure Level | 101 dB (SPL) |
| Effective Frequency Range | 80 Hz to 20 kHz |
| Input Voltage | 100V / 70V / 8 Ohm |
| Environmental Protection | IP 32 |
| Mounting | Adjustable Swivel Bracket (Included) |
| Enclosure Material | Extruded Aluminum |
Contact Us – Choicecycle (SGCCTV Singapore)
📍 Store: SGCCTV Choicecycle
Sim Lim Square #02-81, Singapore
📞 WhatsApp: +65 9853 4404
📧 Email: enquiry@choicecycle.com.sg
🌐 Website: https://sgcctv.com.sg
🕒 Operating Hours: 11 AM – 8 PM (Daily)
The Bosch LB1-UM Series Metal Cabinet Loudspeakers are the pinnacle of industrial audio design, specifically engineered for sites where compromise is not an option. The LB1-UM20E is a 20W power-house that delivers high-fidelity sound through a sophisticated two-way system, all protected by a sleek, extruded aluminum housing.
At ChoiceCycle, we deploy these units in Singapore’s most critical environments—from the high-humidity concourses of Changi Airport to the high-security corridors of government ministries—ensuring that your audio remains crystal clear, even in the event of an emergency.
Technical Masterclass: High-Fidelity in a Hardened Shell
The LB1-UM20E is designed to solve the problem of “muddy” audio in large, echo-prone spaces like marble lobbies or glass-fronted shopping malls.
1. Professional Two-Way Acoustic Engine
Unlike standard PA speakers that use a single driver for all sounds, the LB1-UM20E separates the work:
High-Performance Woofer: Handles the “body” of the sound, providing rich mid-bass that makes background music feel premium rather than tinny.
Silk-Dome Tweeter: A specialized high-frequency driver that ensures vocal “consonants” are sharp. This is the secret to high Speech Intelligibility, allowing announcements to be understood even in noisy crowds.
Precision Crossover: An internal network that seamlessly blends the two drivers for a flat, natural frequency response from 80 Hz to 20 kHz.
2. Extruded Aluminum Resilience
The cabinet isn’t just metal for the sake of it; aluminum offers functional benefits that plastic cannot match:
Impact Resistance: High-grade aluminum protects internal components from physical damage in high-traffic public areas.
Corrosion Protection: The powder-coated finish and aluminum substrate are naturally resistant to the salt-air and humidity of Singapore’s tropical climate.
Modern Architectural Profile: Available in Charcoal (-D) and White (-L), the slim, vertical profile complements contemporary interior designs.
3. Strategic “Point-Source” Coverage
Universal Swivel Bracket: Every unit includes a heavy-duty adjustable bracket. ChoiceCycle technicians use this to “aim” the audio directly at the audience, reducing sound bouncing off ceilings and walls (reverberation).
Multi-Tap Rotary Switch: Easily switch between 20W, 10W, 5W, and 2.5W power settings to balance the volume perfectly across different architectural zones.
2026 Standards: Mission-Critical EVAC Readiness
In 2026, building safety codes in Singapore are stricter than ever. The LB1-UM20E is engineered to be the most reliable link in your life-safety chain.
EN 54-24 Certified: Strictly compliant with European standards for Voice Alarm loudspeakers, ensuring they remain operational during fires.
Fire-Safe Termination: Equipped with ceramic terminal blocks and a thermal fuse. If a fire destroys one speaker, the fuse blows to disconnect it, preventing a short circuit from silencing the rest of the emergency speaker line.
Digital Supervision: These units are fully compatible with Bosch Praesideo and Paviro systems for 24/7 health monitoring of the voice coil and wiring.
Professional Integration by ChoiceCycle
At ChoiceCycle, we don’t just sell speakers; we engineer acoustic solutions. Our LB1-UM series service includes:
STI Score Optimization: We use acoustic simulation to ensure your building meets the required Speech Transmission Index for safety audits.
Safety Loop Validation: We perform rigorous testing on all EVAC loops to ensure compliance with SCDF and international fire safety regulations.
Local Technical Hub: Based at Sim Lim Square, ChoiceCycle provides immediate stock, professional onsite calibration, and the security of an authorized local Bosch warranty.
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Aluminum weather-resistant PA speakers for MRT stations
Technical Summary Table
| Feature | LB1-UM20E-D / L Specifications |
| Rated Power (PHC) | 20 Watts |
| Speaker Type | Two-way (Woofer + Tweeter) |
| SPL at Rated Power | 101 dB |
| Frequency Range (-10dB) | 80 Hz to 20 kHz |
| Input Selection | 100V / 70V / 8 Ohm |
| Safety Certification | EN 54-24 / BS 5839-8 |
| Protection Rating | IP 32 (Drip-proof) |
| Dimensions (HxWxD) | 274 x 160 x 180 mm |
| Weight | Approx. 3.88 kg (including bracket) |
Contact Us – Choicecycle (SGCCTV Singapore)
📍 Store: SGCCTV Choicecycle
Sim Lim Square #02-81, Singapore
📞 WhatsApp: +65 9853 4404
📧 Email: enquiry@choicecycle.com.sg
🌐 Website: https://sgcctv.com.sg
🕒 Operating Hours: 11 AM – 8 PM (Daily)
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