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The Bosch LS1‑UC20E‑1 is a powerful 20 Watt, 100 volt line EN54-24 suspended pendant loudspeaker, for high quality speech and music reproduction in public address sound systems. 

Suspension pendant speakers are designed to be suspended from the ceiling by their connecting cables. Their excellent sound spread makes them ideal for use in buildings with high ceilings in sound systems for supermarkets and DIY stores, garden centres and factories.

The Bosch LS1UC20E-1 is also a suitable EN54-24 pendant speaker for use in voice evacuation systems as it is fully compliant with BS5839 part 8 and EN54-24. Integral safety features ensure that the integrity of the loudspeaker circuit is maintained in the event of a fire, enabling safety announcements to continue to be made.

  • Superb speech and music reproduction
  • Wide sound spread
  • Ease of installation
  • Modern unobtrusive styling
  • Tough, impact-resistant enclosure
  • 5 m connection cable
  • Provision for optional safety cord
  • Water resistant and dust protected to IP 65
  • BS 5839 part 8 compliant
  • EN 54‑24 certified

Additional Information

Maximum power


Rated power

20 / 10 / 5 / 2.5 W

Sound pressure level at 20 W / 1 W (1kHz, 1 m)

99 dB / 86 dB (SPL)

Opening angle at 1 kHz / 4 kHz (-6 dB)

220° / 65°

Effective frequency range (-10dB)

80 Hz to 20 kHz

Rated voltage

100 V

Rated impedance

500 ohm


3‑pole screw terminal

Dimensions (D x L)

185 x 254 mm (7.3 x 10 in)


3 kg (6.6 lb)


White (RAL 9010)



View FileBosch LS1-UC20E Datasheet    Size: (440.95 KB)
View FileEN54-24 Certificate of Conformity: LP1BC10E-1, UC10E-1, UC20E-1, LS1-UC20E-1    Size: (898 KB)
View FileEC Declaration of Conformity: LL1-UC20E-1    Size: (1004.43 KB)
Product video for Bosch LS1-UC20E-1