Power Amplifire: LBB1938
Powerful Bosch LBB1938 Power Amplifier. Ideal for commercial applications, this high-performance amplifier delivers exceptional sound quality and reliable performance. Explore its features, specifications, and pricing options.
Key Features
- 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
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Description
Power Amplifier
The 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 show the status of the Power Amplifier, audio output level, and supervised functions. This high-performance unit fulfils a wide range of public address requirements at a surprisingly low cost.
The Power 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. The unit operates both on mains power and on a 24 V battery power supply for emergency backup, with automatic switchover.
For emergency and evacuation use, the following functions are monitored: mains presence, battery present, pilot tone presence, amplifier operation. Front panel LEDs indicate the status of supervised functions. The LEDs of pilot‐tone supervision and battery status can be switched off for general public address use. Failsafe (normally energized) relays are provided for each supervised function. These relays are always active regardless of the switches on the rear panel.
Specifications
- Voltage: 230VAC, ±10%, 50/60 Hz
- Inrush current: 19 A
- Max power consumption: 2200 VA
- 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
- 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 ohms
- 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 WPilot 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 loadMechanical
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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