The fast route to safety
PLENA Public Address and Voice Alarm System
PLENA voice alarm components
LBB1938/30 PLENA 480 W Power Amplifier
480 W amplifier for the PLENA Voice Alarm System: 70 V / 100 V and 8 ohm outputs, dual inputs with priority switching, EN 54-16 certified.
- 480 W Output
- 70 V / 100 V and 8 Ohm
- EN 54-16 Certified
The fast route to safety
PLENA Public Address and Voice Alarm System
PLENA voice alarm components
LBB1938/30 PLENA 480 W Power Amplifier
480 W amplifier for the PLENA Voice Alarm System: 70 V / 100 V and 8 ohm outputs, dual inputs with priority switching, EN 54-16 certified.
- 480 W Output
- 70 V / 100 V and 8 Ohm
- EN 54-16 Certified
Power Amplifier
Bosch LBB1938/30 480W Plena Power Amplifier
Performance
50 Hz to 20 kHz (+1/‑3 dB @ ‑10 dB ref. rated output)
<1% @ rated output power, 1 kHz
Loudspeaker Output
The amplifier has 70 V and 100 V outputs for constant voltage loudspeaker systems and a low impedance output for 8 Ohm loudspeaker loads.
Priority Controlled Output
The LBB 1938/30 has 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.
Line Inputs
Dual inputs with priority switching
Line Loop-through
The system has two balanced inputs with priority control, each with a loop-through facility. This makes it easy to connect remote systems that require priority control.
Controls and Indicators
Overheat indicator, Air inlet for forced air cooling, Battery operation indicator
Level control input 1 & 2, Power button, Mains switch
Protection
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.
Key specs
- 480 W output power
- 70 V / 100 V and 8 ohm outputs
- Dual inputs with priority switching, 100 V slave input
- EN 54-16 / ISO 7240-16 certified
- 3 U 19" housing
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Electrical |
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Mains Power Supply |
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Voltage |
230 VAC ±10%, 50/60 Hz |
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Inrush current |
19 A |
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Max power consumption |
2200 VA |
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Battery Power Supply |
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Voltage |
24 VDC +15% / -15% |
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Current max |
30 A |
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Performance |
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Output power (rms/maximum) |
480 / 720 W |
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Power reduction on backup power |
-1 dB |
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Frequency response |
50 Hz to 20 kHz (+1 / -3 dB at -10 dB ref. rated output) |
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Distortion |
<1% at rated output power, 1 kHz |
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S/N (flat at max volume) |
>90 dB |
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Line inputs |
2 x |
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Connector |
3-pin XLR, balanced |
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Sensitivity |
1 V |
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Impedance |
20 kohm |
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CMRR |
>25 dB (50 Hz to 20 kHz) |
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Gain |
40 dB |
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100 V Input |
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Connector |
Screw, unbalanced |
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Sensitivity |
100 V |
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Impedance |
330 kohm |
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Line loop-through output |
2 x |
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Connector |
3-pin XLR |
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Nominal level |
1 V |
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Impedance |
Direct connection to line input |
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Loudspeaker Outputs |
3 x |
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Connector |
Screw, floating |
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Direct output |
100 V, 70 V, 8 ohm |
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Priority only (from input 1) |
100 V or 70 V internally selectable |
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Music (non-priority) only |
100 V or 70 V internally selectable |
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Power Consumption |
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Mains operation |
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Max power |
990 W |
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-3dB |
715 W |
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-6dB |
510 W |
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Pilot tone |
110 W |
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Idle |
125 W |
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24 VDC operation |
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Max power |
32 A (770 W) |
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-3 dB |
26 A (625 W) |
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-6 dB |
18 A (430 W) |
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Pilot tone* |
3.8 A (91 W ) |
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Idle |
0.7 A (17 W) |
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Mechanical |
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Dimensions (H x W x D) |
145 x 430 x 370 mm (19" wide, 3U high, with feet) |
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Weight |
Approx. 25 kg |
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Mounting |
Standalone, 19”rack |
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Color |
Charcoal |
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Environmental |
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Operating temperature |
-10 ºC to +55 ºC (14 ºF to +131 ºF) |
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Storage temperature |
-40 ºC to +70 ºC (-40 ºF to +158 ºF) |
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Relative humidity |
<95% |
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Acoustic noise level of fan |
<48 dB SPL at 1 m (max output) |