Bosch LBB1930/20 – Power amplifier, 1x120W

The LBB1930/20 Plena Power Amplifier is a high-performance, 120 W amplifier housed in a compact 2U, 19-inch case. Designed for professional public address and voice alarm systems, it features dual inputs with priority switching, multiple output options, and failsafe functionality. Its robust construction and comprehensive supervision make it an ideal solution for reliable audio amplification in various applications.

Key Features

• High-Quality Audio Output:
  • Delivers 120 W RMS output with a frequency response of 50 Hz to 20 kHz.
  • Offers 70 V, 100 V, and 8-ohm loudspeaker outputs for flexible installations.
• Priority Switching and Dual Inputs:
  • Two balanced inputs with priority control and loop-through functionality.
  • Separate priority-controlled outputs for announcements and non-priority zones.
• Dependable Performance:
  • Protected against overload and short circuits.
  • Temperature-controlled fan minimizes acoustic noise and ensures reliable operation.
  • Automatic switchover between mains and 24 VDC battery power for emergency use.
• Comprehensive Supervision:
  • Monitors mains, battery, pilot tone, and amplifier operation.
  • Front panel LED indicators display status for all supervised functions.
  • Failsafe relays for critical monitoring functions.
• Ease of Installation:
  • Rear-panel level controls and interconnections prevent accidental changes.
  • Supports 19-inch rack or standalone mounting.
  • Compact design ensures efficient use of space.

Certifications and Compliance

• Safety Standards: EN 60065.
• Electromagnetic Compatibility:
  • Immunity: EN 55103-2.
  • Emission: EN 55103-1.
• Regulatory Compliance: CE-certified.

Technical Specifications

Electrical

• Mains Power Supply:
  • Voltage: 230 VAC ±10%, 50/60 Hz.
  • Inrush Current: 8 A.
  • Maximum Power Consumption: 400 VA.
• Battery Power Supply:
  • Voltage: 24 VDC ±15%.
  • Maximum Current: 6 A.
• Performance:
  • Output Power: 120 W RMS / 180 W Maximum.
  • Frequency Response: 50 Hz to 20 kHz (+1/-3 dB).
  • Distortion: <1% at rated output power, 1 kHz.
  • Signal-to-Noise Ratio: >90 dB.

Inputs and Outputs

• Line Inputs (2):
  • Connector: 3-pin XLR, balanced.
  • Sensitivity: 1 V.
  • Impedance: 20 kΩ.
• 100 V Input:
  • Connector: Screw terminal, unbalanced.
  • Sensitivity: 100 V.
  • Impedance: 330 kΩ.
• Line Loop-Through Outputs (2):
  • Connector: 3-pin XLR.
  • Nominal Level: 1 V.
• Loudspeaker Outputs (3):
  • Connector: Screw terminals, floating.
  • Options: 100 V, 70 V, 8 ohm.

Power Consumption (Mains)

• Max Power: 274 W.
• -3 dB Power: 193 W.
• -6 dB Power: 143 W.
• Idle Power: 18 W.

Power Consumption (24 VDC)

• Max Power: 168 W (7.0 A).
• Idle Power: 2.4 W (0.1 A).

Mechanical

• Dimensions (H x W x D): 100 × 430 × 270 mm (19-inch rack size).
• Weight: Approx. 10.5 kg.
• Color: Charcoal.

Environmental

• Operating Temperature: -10 °C to +55 °C.
• Storage Temperature: -40 °C to +70 °C.
• Humidity: <95% (non-condensing).
• Fan Noise Level: <48 dB SPL at 1 m (maximum output).

Parts Included

• 1 × LBB1930/20 Plena Power Amplifier.
• 1 × Power cord.
• 1 × Set of 19-inch mounting brackets.
• 1 × XLR cable.
• 1 × Safety instructions.

Applications

The LBB1930/20 Plena Power Amplifier is designed for professional audio installations, such as:

• Public Address Systems.
• Voice Alarm Systems.
• Emergency Evacuation.
• Background Music (BGM) systems.
  Ideal for use in shopping centers, airports, schools, office buildings, and other public spaces requiring reliable, high-quality sound amplification.