BOSCH LBB1938 Power Amplifier


The Bosch LBB 1938/20 is a powerful 480 W power amplifier in a 3U high 19” case for rack mounting or tabletop use.

LEDs on the front panel of the LBB1938/20 show the status of the amplifier: power, audio output level, and supervised functions.

This high-performance unit fulfills a wide range of public address requirements at a surprisingly low cost.

There is two separate priority controlled 100 V outputs for zones that only need announcements made via the priority input, and for zones that will not get any announcements made via the priority input.

Rack mounting brackets supplied.

  • 480 watts
  • Very high audio performance power amp
  • Can be used to boost Plena Voice alarm systems with system monitoring
  • XLR and jack input with XLR and Jack loop through outputs
  • 100-volt line input. Ideal for remote location booster amps
  • 100v, 70v and 8-ohm outputs
  • 24v override relay output
  • Temperature controlled fan
  • AC and 24VDC operation
  • LED VU Meter
  • Dual inputs with priority switching
  • Temperature-controlled forced front to back
  • Mains, battery backup, and pilot tone supervision
  • TÜV certified according to IEC 60849