BOSCH LB1-UM20E

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BOSCH LB1‑UM20E Premium‑sound Cabinet Loudspeaker Range

▶High-fidelity music and speech reproduction
▶Supplied with adjustable wall‑mounting bracket
▶Self‑restoring overload protection
▶Provision for internal mounting of the optional line / loudspeaker supervision board
▶EN 54‑24 certified

The Premium‑sound range of cabinets is intended for clear reproduction of speech, foreground and background music to be used in general indoor and outdoor applications. 20 Watt power handling capacity. The enclosures are made from aluminum with ABS top and bottom covers and are available in charcoal (D) and white (L). Typical applications for these products are: theme bars, music restaurants, theme parks, retail outlets, audio visual, boardrooms and offices, exhibition areas and presentation environments, fitness centre. Its excellent sound reproduction capability is attributed the superb to the use of high‑quality driver components and crossover network design. A self‑restoring passive element protects the high frequency driver against incidental overload. A three‑way ceramic terminal block with screw connections suitable for loop-through wiring is located in the compartment in the base of the unit. An easy to install, sturdy wall mounting bracket is standard supplied. The same bracket can be used in  combination with the universal floor stand LBC 1259/00 for temporary installations.
All models are supplied with a built‑in 70/100 V transformer with taps on the primary winding for full‑power, half‑power, quarter‑power and one‑eighth power radiation. These taps are connected to a rotary vari‑tap switch located in the compartment in the base of the enclosure, to allow simple output power setting. A low ohmic connection is also provided on the vari‑tap switch.

Functions
Connections and safety
The loudspeakers have a ceramic terminal block, thermal fuse, and heat‑resistant, high‑temperature wiring. The cabinets have a provision for internally mounting the optional line/loudspeaker supervision board.

Certifications and approvals
All Bosch loudspeakers are designed to withstand operating at their rated power for 100 hours in accordance with IEC 268‑5 Power Handling Capacity (PHC) standards. Bosch has also developed the Simulated Acoustical Feedback Exposure (SAFE) test to demonstrate that the speakers can withstand two times their rated power for short durations. This ensures extra reliability under extreme conditions, leading to greater customer satisfaction, longer operating life, and much less chance of failure or performance deterioration.
Safety : according to EN 60065

Technical specifications

Electrical*

• Description : Premium‑sound Cabinet Loudspeaker
• Maximum power : 30 Watt
• Rated power (PHC) : 20 Watt
• Power tapping : 20 / 10 / 5 / 2.5 W
• Sound pressure level at rated power / 1 W (1 kHz, 1 m) : 101 dB / 88 dB (SPL)
• Effective frequency range (-10 dB) : 90 Hz to 20 kHz
• Opening angle at 1 kHz / 4 kHz (-6 dB) :
  – horizontal : 174° / 136°
  – vertical : 127° / 141°
• Rated input voltage : 12.65 / 70 / 100 V
• Rated impedance : 8 / 250 / 500 ohm

Connector : 3‑pole screw block

 

* Technical performance data acc. to IEC 60268‑5

Mechanical

• Dimensions (H x W x D): 274x160x180mm (10.78×6.29×7.08 inch)
• Loudspeaker diameter
  – Woofer : 134.5 mm (5 in)
  – Dome tweeter : 25.4 mm (1 in)
• Material
  – Cabinet : Aluminum
  – Front grille : Aluminum
  – Top and bottom : ABS
• Color : White (RAL 9010) (L) or Charcoal (RAL 7021) (D)
• Weight : 3.88 kg (8.55 lb)

Environmental

• Operating temperature : -25 ºC to +55 ºC (-13 ºF to +131 ºF)
• Storage temperature : -40 ºC to +70 ºC (-40 ºF to +158 ºF)
• Relative humidity : <95%