No products in the cart.
Roll over image to zoom in
Click to open expanded view
Bosch LBB 1938/20 Plena Power Amplifier
- 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
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.
|Storage temperature||-40 Degree Celsius to +70 Degree Celsius|
|Direct output||100 V, 70 V, 8/4 ohm|
|Music (non-priority) only||100V/70V internally selectable|
|Dimensions (H x W x D)||145 x 430 x 370 mm|
|Mounting||19″ rack, 3U height|
|Rated Output (RMS)||480W|
|Operating temperature||-10 Degree Celsius to +45 Degree Celsius|
|Relative humidity||Less than 95 percent|
|Distortion||Less Than 1percent at rated power,1kHz|
|Acoustic noise level of fan||Less than 48dB SPL at 1m(max output)|
|Type||Bosch Bosch Plena Booster Amplifier 480 W|
|Input Voltage||230VAC +/-10percent at 50/60Hz or 24VDC|
|Inrush Current||19A at 230 VAC, 30A at 24VDC|
|Power reduction on backup power||-1 dB|
|Priority only (from input 1)||100V/70V internally selectable|
|Frequency response||60 Hz to 18 kHz (+1 / -3 dB at -10 dB ref. rated output)|
|S/N (flat at max volume)||More than 90 dB|
|Power consumption||1600 VA|