Bosch LBB 1938/20 Plena Power Amplifier

৳ 125,000.00

In stock

  • 480 W power amplifier in a 3U high 19”housing
  • EN 54‑16 certified and EN 60849 compliant
  • 70 V / 100 V and 8 ohm outputs
  • Dual inputs with priority switching
  • 100 V input for slave operation on 100 V speaker line
EAN: Bosch LBB 1938/20 SKU: Bosch LBB 1938/20 Categories: , Tags: , , , Brand:

Bosch LBB 1938/20 Plena Power Amplifier in Bangladesh

The 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 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.


The amplifier is protected against overload and short circuits. A temperature-controlled fan ensures high reliability at high output levels and low acoustic noise at lower output levels. An overheat protection circuit switches off the power stage and activates an LED on the front panel, if the internal temperature reaches a critical limit due to poor ventilation or overload.

The unit operates both on mains power and on a 24 V battery power supply for emergency back up, with automatic switchover.

For emergency and evacuation use, the following functions are monitored: mains presence, battery present, pilot tone presence, amplifier operation. Front panel LEDs indicate the status of supervised functions. The LEDs of pilot tone supervision and battery status can be switched off for general public address use. Failsafe (normally energized) relays are provided for each supervised function. These relays are always active regardless of the switches on the rear panel.

Bosch LBB 1938/20 Plena Power Amplifier in Bangladesh.

Bosch LBB 1938/20 Plena Power Amplifier in Bangladesh.

Product Specification

RMS480 watt
Pilot tone110W
Storage temperature-40 Degree Celsius to +70 Degree Celsius
Direct output100 V, 70 V, 8/4 ohm
Music (non-priority) only100V/70V internally selectable
Dimensions (H x W x D)145 x 430 x 370 mm
Mounting19″ rack, 3U height
Rated Output (RMS)480W
Operating temperature-10 Degree Celsius to +45 Degree Celsius
Relative humidityLess than 95 percent
DistortionLess Than 1percent at rated power,1kHz
Acoustic noise level of fanLess than 48dB SPL at 1m(max output)
ModelBosch LBD1938/00
TypeBosch Bosch Plena Booster Amplifier 480 W
Input Voltage230VAC +/-10percent at 50/60Hz or 24VDC
Inrush Current19A at 230 VAC, 30A at 24VDC
Power reduction on backup power-1 dB
Priority only (from input 1)100V/70V internally selectable
Frequency response60 Hz to 18 kHz (+1 / -3 dB at -10 dB ref. rated output)
S/N (flat at max volume)More than 90 dB
Power consumption1600 VA
Max power990W
-3 dB715W

Bosch LBB 1938/20 Price in Bangladesh (BD) for December, 2023

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Bosch LBB 1938/20 Plena Power Amplifier

৳ 125,000.00

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