Sound system BOSCH LBB 1935/20 Plena Power Amplifier

BOSCH LBB 1935/20 Plena Power Amplifier

240 W power amplifier in a 2U 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

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