BOSCH LBB1938 Power Amplifier
SKU:133,000৳
The Bosch 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 of the LBB1938/20 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.
There are 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.
Rack mounting brackets supplied.
- 480 watts
- Very high audio performance power amp
- Can be used to boost Plena Voice alarm systems with system monitoring
- XLR and jack input with XLR and Jack loop through outputs
- 100 volt line input. Ideal for remote location booster amps
- 100v, 70v and 8 ohm outputs
- 24v override relay output
- Temperature controlled fan
- AC and 24VDC operation
- LED VU Meter
- Dual inputs with priority switching
- Temperature controlled forced front to back
- Mains, battery back-up, and pilot tone supervision
- TÜV certified according to IEC 60849
BOSCH LBB1938 Power Amplifier Spces:
- Voltage: 230VAC, ±10%, 50/60 Hz
- Inrush current :19 A
- Max power consumption: 2200 VA
- Battery power supply
- Voltage: 24 VDC, +20% / -10%
- Current max: 30 A
Performance
- Output power (rms/maximum): 480 W / 720 W
- Power reduction on backup power: -1 dB
- Mains power supply
- 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
- Line inputs: 2 x
- Connector: 3-pin XLR, balanced
- Sensitivity: 1 V
- Impedance: 20 kohm
- CMRR: >25 dB (50 Hz to 20 kHz)
- Gain: 40 dB
- 100 V input: Connector Screw, unbalanced
- Sensitivity: 100 V
- Impedance: 330 kohm
- Line loop-through output 2 x
- Connector: 3-pin XLR
- Nominal level: 1 V
- Impedance: Direct connection to line input
- Loudspeaker outputs: 3 x
- Connector: Screw, floating
- Direct output: 100 V, 70 V, 8 ohm
- Priority only (from input 1): 100V or 70 V internally selectable
- Music (non-priority) only: 100V or 70 V internally selectable
Power consumption
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 -20dB 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
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