The d&b 25D amplifier is a compact 2 RU installation amplifier designed to deliver high-quality performance for smaller-scale audio systems. While intended for less demanding power requirements, it maintains the complete DSP functionality found in d&b’s more powerful amplifier models.

With an unweighted dynamic range of 112 dB, the d&b 25D amplifier is engineered to drive high-voltage d&b loudspeakers. It includes comprehensive speaker management and protection features, ensuring consistent performance and system reliability.

A 4.3-inch colour touchscreen (480 x 272 pixels) provides a clear and detailed user interface, offering complete control over device settings and real-time status updates.

The 25D amplifier supports sustainable system design through energy-efficient technologies such as Automatic Wake Up and advanced power-saving features. These attributes make it suitable for projects aligned with Green Building and environmentally responsible standards.

Integrated Signal Processing

The onboard DSP in the d&b 25D amplifier expands system flexibility with loudspeaker-specific filters and two user-programmable 16-band EQs, simplifying precise system tuning for any space or requirement.

Advanced Input Management

The 25D amplifier supports up to 16 input channels, including:

• 8 Milan audio inputs

• 4 analogue inputs via Phoenix™ Euroblock (A1–A4)

• 4 AES3 digital inputs with corresponding link outputs (D1/2 and D3/4)

Each input can be flexibly routed to any of the four output channels (A to D), providing versatile signal distribution in installation scenarios.

Comprehensive System Monitoring

The d&b 25D amplifier includes several monitoring and diagnostic tools essential for fixed installations:

• System Check: Measures speaker impedance to verify performance and identify potential faults or damage.

• Input Monitoring: Detects pilot signals even if not routed to an output.

• Load Monitoring: Continuously checks loudspeaker impedance to flag possible driver failures.

These functions enhance system safety and ensure operational readiness, especially in emergency situations.

GPIO and General Fault Functionality

The 25D amplifier features dedicated Euroblock connectors for General Purpose Input/Output (GPIO) and fault reporting. The GPIO interface offers 8 inputs and 4 outputs, allowing integration with external control systems. Functions enabled through GPIO include:

• Remote power control

• Channel muting (individual or all)

• Switching between AmpPresets

• Monitoring channel and mains voltage status

The General Fault contact supports integration with broader building management and alert systems by signalling fault conditions externally.