Bosch - LC1-UM24E8, 24W Coaxial EN 54-24 Ceiling Loudspeaker for 70V/100V Systems

Features

- Professional flush-mounted ceiling loudspeaker

- Two-way coaxial driver configuration

- High-performance 6.5-inch coaxial transducer

- Clear speech and music reproduction

- Maximum rated output of 24 watts

- Four selectable transformer power settings

- Available taps: 24 W, 12 W, 6 W and 3 W

- Full, half, quarter and eighth-power selection

- Integrated 70 V and 100 V matching transformer

- Compatible with distributed-audio systems

- Extended frequency range from 55 Hz to 20 kHz

- 89 dB sensitivity at one watt and one meter

- Maximum rated output of 103 dB at one meter

- Wide 180-degree coverage at 1 kHz

- Controlled 58-degree coverage at 4 kHz

- Even sound distribution across indoor spaces

- High intelligibility for voice announcements

- Music performance suitable for professional installations

- Integrated circular metal front grille

- All-steel frame and grille construction

- Discreet white RAL 9010 finish

- Common grille size across the LC1 range

- Three-pole ceramic screw-terminal block

- Loop-through facility for daisy-chain wiring

- Integrated thermal-protection fuse

- Heat-resistant high-temperature internal wiring

- Built-in protection against fire-related damage

- Helps maintain loudspeaker-circuit integrity

- Provision for end-of-line supervision board

- Compatible with the optional PRA-EOL board

- Compatible with the PM1-LISD DC-blocking board

- Optional pilot-tone indication available

- Compatible with the LC1-MMSB mounting bracket

- Compatible with the LC1-CMR mounting ring

- Compatible with the LC1-CBB back box

- Compatible with the LC1-CSMB surface-mounting box

- Supports suspension with the LC1-MSK kit

- Compatible with LC1-MFD and LC1-MFDS fire domes

- Multiple ceiling-mounting methods available

- EN 54-24 certified in specified configurations

- Compliant with BS 5839-8 voice-alarm applications

- UL 1480 and UL 2043 certified

- Suitable for public-address and evacuation systems

- Ceiling-mounting accessory sold separately

Specifications

- Brand: Bosch

- Model: LC1-UM24E8

- Product number: F.01U.075.449

- Product range: LC1 Modular Ceiling Loudspeakers

- Product type: Two-way coaxial ceiling loudspeaker

- Application: Speech, music and voice alarm

- Driver configuration: Two-way coaxial

- Nominal driver diameter: 6.5 inches

- Rated power: 24 W

- Selectable power taps: 24 W, 12 W, 6 W and 3 W

- Compatible line voltages: 70 V and 100 V

- 24 W impedance: 208 Ω at 70 V / 416 Ω at 100 V

- 12 W impedance: 416 Ω at 70 V / 833 Ω at 100 V

- 6 W impedance: 833 Ω at 70 V / 1,667 Ω at 100 V

- 3 W impedance: 1,667 Ω at 70 V / 3,333 Ω at 100 V

- Effective frequency range: 55 Hz to 20 kHz

- Sensitivity at 1 W/1 m: 89 dB SPL

- Rated-power level at 1 m: 103 dB SPL

- One-watt level at 4 m: 77 dB SPL

- Rated-power level at 4 m: 91 dB SPL

- Coverage at 1 kHz: 180° horizontal and vertical

- Coverage at 2 kHz: 106° horizontal and vertical

- Coverage at 4 kHz: 58° horizontal and vertical

- Coverage at 8 kHz: 57° horizontal and vertical

- Connector: Three-pole screw-terminal block

- Terminal type: Heat-resistant ceramic

- Integrated protection: Thermal fuse

- Internal wiring: High-temperature resistant

- Outside diameter: 220 mm

- Maximum depth: 125 mm

- Frame material: Steel

- Front-grille material: Steel

- Color: White

- Color reference: RAL 9010

- Net weight: 1.75 kg

- Operating temperature: -25 °C to +55 °C

- Storage and transport temperature: -40 °C to +70 °C

- Relative humidity: Up to 95%, non-condensing

- Voice-alarm certification: EN 54-24

- Evacuation compliance: BS 5839-8

- United States certifications: UL 1480 and UL 2043

- Water and dust protection: IP21C with compatible accessory

- Installation type: Flush, surface or suspended mounting

- Flush-mounting accessory included: No

- Supplied quantity: One LC1-UM24E8 loudspeaker