Bosch PRS-4P125-EU Power Amplifier

Bosch PRS-4P125-EU Power Amplifier

The Bosch PRS-4P125-EU is a professional 4-channel power amplifier from the Praesideo public address and voice alarm system. It is designed for high-reliability audio distribution in critical environments such as airports, transportation hubs, industrial facilities, and large commercial buildings.

Each channel delivers independent amplification with full system supervision, making it suitable for EN54-compliant voice evacuation systems.

Key Features

• 4 independent amplifier channels (4 × 125W)
• Designed for 100V / 70V / 50V PA systems
• Full amplifier and loudspeaker line supervision
• Automatic fault detection and reporting
• Spare amplifier switching (redundancy support)
• Built-in audio processing and delay per channel
• Integrated pilot-tone monitoring for system integrity
• Redundant network connection for high reliability

Technical Specifications

• Model: PRS-4P125-EU
• Type: 4-channel network power amplifier
• Power Output: 4 × 125 W (total 500 W system power class)

Audio & Performance:

• Frequency Response: approx. 50 Hz – 20 kHz
• Signal-to-Noise Ratio: >85 dB
• Low distortion with high-efficiency amplification
• Independent channel processing and delay

Inputs / Outputs:

• 2 × audio inputs
• 4 × amplified outputs (100V / 70V / 50V selectable)
• 8 × control inputs
• 4 × control outputs
• Spare amplifier connection support

System Functions

• Continuous self-monitoring
• Loudspeaker line supervision (open/short detection)
• Automatic volume control
• Fault reporting to central controller
• Redundant loop network support for fail-safe operation

Power & Hardware

• Power Supply: 115/230V AC ±10%, 50/60 Hz
• Backup Power: 48V DC battery input support
• Form Factor: 19” rack mount (2U)
• Cooling: Forced ventilation system

Applications

• Voice alarm (EN54) systems
• Airports and railway stations
• Shopping centers and stadiums
• Industrial facilities
• Large public buildings

Advantages for Buyers

• Extremely reliable mission-critical PA amplifier
• Full system supervision and fault detection
• Designed for life-safety voice evacuation systems
• Scalable for large multi-zone installations
• Industrial-grade Bosch engineering