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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Easy to use, with simple zone labels included in the box as well as setting indicators which enable the installer to place colored markers on the volume and tone controls to indicate optimum and maximum recommended volume settings.
Despite its simplicity, the PLE 1MA060 still has flexible features such as ducking, priority paging, and voice-activated emergency override. 19″ rack mounting brackets are included should you wish to build into a 19″ equipment rack.
- 60 watt, 100-volt line
- Also compatible with 8-ohm speakers
- 4 low noise balanced inputs for mic or line with phantom power
- 3 separate line inputs
- Further 100-volt input and Telephone input with priority
- RJ45 connection for remote wall plate WP3S2Z (see ancillary section)
- Contact closure and Vox priority
- Built-in chime for announcements
- Zone labeling and setting indicator pins
- Smart equalizing
- AC and 24VDC operation
- LED VU Meter
- 19″ rack mount brackets included
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