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Bosch LB1-UM50E-D & LB1-UM50E-L

EN54-24 cabinet speaker .70 volt, 100 volt line or 8 ohm, 50 watts.

Water resistant. IP65 rated.

List price Ex. VAT: £199.00

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The Bosch LB1-UM50E-D & LB1-UM50E-L EN54-24 cabinet loudspeaker is rated at 50 watts and is suitable for clear reproduction of speech, foreground and background music.

Integral safety features ensure that the LB1UM50E is compliant with EN54-24, for use in emergency voice evacuation systems.

The input is selectable between 70V, 100 volt line and 8 ohm.

A sturdy wall mounting bracket is supplied.

Available in charcoal: LB1-UM50E-D or white: LB1-UM50E-L.

  • 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
  • Water resistant. IP65 rated.

*Please note that the charcoal coloured speaker in the image above is the LB1-UM20E.

Additional Information


LB1‑UM50E cabinet loudspeaker

Maximum power

75 W

Rated power (PHC)

50 W

Power tapping

50/25/12.5/6.2/5 W

Sound pressure levelat rated power / 1 W (70 Hz, 1 m)

108 / 91 dB

Effective frequency range (-10 dB)

90 Hz to 20 kHz

Rated input voltage

20/70/100 V

Rated impedance

8/100/200 Ohm


3 pole screw block

Dimensions (H x W x D)

405 x 160 x 180 mm(15.94 x 6.29 x 7.08 in)


5.58kg (12.3 lb)


White (RAL 9010) or Charcoal (RAL7021)



- Loudspeaker cabinet & front grille


- Top & bottom


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


Product video for Bosch LB1-UM50E-D & LB1-UM50E-L
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