- BOSCH Audio
- Bosch Plena Power Amplifier Lbb-1938/30
Bosch Plena Power Amplifier Lbb-1938/30
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29 / 01 / 2024
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Detail Bosch Plena Power Amplifier Lbb-1938/30
▶480 W power amplifier in a 3U high 19" housing
▶EN 54-16 certified
▶70 V / 100 V and 8 ohm outputs
▶Dual inputs with priority switching
▶100 V input for slave operation on 100 V speaker line
The LBB 1938/30 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 fulfils a wide range of public address requirements at a surprisingly low cost. Toa Amplifier.
Functions
Dependability
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.
Controls and indicators
Front
• Meter (LED's for -20, -6, 0 dB and Power ON) • Battery operation indicator
• Overheat indicator • Air inlet for forced air cooling
Back
• Level control input 1 • Level control input 2 • Power button • Mains switch
Interconnections
Back
• Priority line input 1 (XLR/balanced) • Line loop-through 1 (XLR/balanced) • Program line input 2 (XLR/balanced)
• Line loop-through 2 (XLR/balanced) • Priority controlled loudspeaker output terminals
• 24 VDC power supply terminal • Three loudspeaker direct output terminals • Two 100 V slave input terminals
• Input 2 enable control terminal • Input 1 priority control terminal • Earth connection screw • Mains socket
Technical Specifications
Electrical
Mains power supply
Voltage 230 VAC, ±10%, 50/60 Hz, Inrush current 19 A, Max power consumption 2200 VA
Battery power supply
Voltage 24 VDC +15% / -15%, Current max 30 A
Performance
Output power (rms 480 Watt /maximum 720 Watt), Power reduction on backup power :-1 dB
Frequency response 50 Hz to 20 kHz (+1/-3 dB @ -10 dB ref. rated output)
Distortion <1% @ rated output power, 1 kHz, S/N (flat at max volume) >90 dB
Power consumption
Mains operation
Max power : 990 W, -3dB : 715 W, -6dB : 510 W, Pilot tone* : 110 W, Idle : 25 W
24 VDC operation
Max power : 32 A (770 W, -3 dB : 26 A (625 W), -6 dB : 18 A (430 W), Pilot tone* : 3.8 A (91 W), Idle : 0.7 A (17 W)
* 20 kHz -20 dB with maximum loudspeaker load
Mechanical
Dimensions (H x W x D) 145 x 430 x 370 mm (19" wide, 3U high, with feet)
Weight Approx. 25 kg, Mounting Standalone, 19”rack, Color Charcoal
Environmental
Operating Temperature -10 to +55ºC, Storage Temperature -40 to +70ºC,
Relative Humidity <95%, Acoustic Noise Level of Fan <48 dB SPL @ 1 m
Tampilkan Lebih Banyak
▶EN 54-16 certified
▶70 V / 100 V and 8 ohm outputs
▶Dual inputs with priority switching
▶100 V input for slave operation on 100 V speaker line
The LBB 1938/30 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 fulfils a wide range of public address requirements at a surprisingly low cost. Toa Amplifier.
Functions
Dependability
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.
Controls and indicators
Front
• Meter (LED's for -20, -6, 0 dB and Power ON) • Battery operation indicator
• Overheat indicator • Air inlet for forced air cooling
Back
• Level control input 1 • Level control input 2 • Power button • Mains switch
Interconnections
Back
• Priority line input 1 (XLR/balanced) • Line loop-through 1 (XLR/balanced) • Program line input 2 (XLR/balanced)
• Line loop-through 2 (XLR/balanced) • Priority controlled loudspeaker output terminals
• 24 VDC power supply terminal • Three loudspeaker direct output terminals • Two 100 V slave input terminals
• Input 2 enable control terminal • Input 1 priority control terminal • Earth connection screw • Mains socket
Technical Specifications
Electrical
Mains power supply
Voltage 230 VAC, ±10%, 50/60 Hz, Inrush current 19 A, Max power consumption 2200 VA
Battery power supply
Voltage 24 VDC +15% / -15%, Current max 30 A
Performance
Output power (rms 480 Watt /maximum 720 Watt), Power reduction on backup power :-1 dB
Frequency response 50 Hz to 20 kHz (+1/-3 dB @ -10 dB ref. rated output)
Distortion <1% @ rated output power, 1 kHz, S/N (flat at max volume) >90 dB
Power consumption
Mains operation
Max power : 990 W, -3dB : 715 W, -6dB : 510 W, Pilot tone* : 110 W, Idle : 25 W
24 VDC operation
Max power : 32 A (770 W, -3 dB : 26 A (625 W), -6 dB : 18 A (430 W), Pilot tone* : 3.8 A (91 W), Idle : 0.7 A (17 W)
* 20 kHz -20 dB with maximum loudspeaker load
Mechanical
Dimensions (H x W x D) 145 x 430 x 370 mm (19" wide, 3U high, with feet)
Weight Approx. 25 kg, Mounting Standalone, 19”rack, Color Charcoal
Environmental
Operating Temperature -10 to +55ºC, Storage Temperature -40 to +70ºC,
Relative Humidity <95%, Acoustic Noise Level of Fan <48 dB SPL @ 1 m
