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DA2.5
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The FDB DA2.5 is a compact two-channel digital power amplifier developed for professional fixed-installation audio systems. It de
livers 2×500W at 8Ω, 2×750W at 4Ω, or 1×1125W in 8Ω bridge mode, providing flexible output options for different passive loudspeaker configurations.
The amplifier incorporates multi-loop control technology, a modular internal design, active power factor correction and soft-switching power-supply technology. These features support stable operation, efficient power utilization and consistent audio performance in demanding installation environments.
With a standard 1U rack-mount chassis, compact dimensions and straightforward operation, the DA2.5 is suitable for projects where rack space, installation efficiency and long-term reliability are important.
The DA2.5 provides flexible output power for professional sound-reinforcement systems:
Operating Mode | Rated Output Power |
8Ω Stereo | 2×500W |
4Ω Stereo | 2×750W |
8Ω Bridge | 1×1125W |
Rated power is measured using a continuous 1kHz sine-wave signal at 1% THD with one channel driven.
The amplifier offers a typical frequency response of ±0.5dB from 20Hz to 20kHz, helping maintain balanced reproduction across the audible frequency range. A typical THD+N value of 0.01% supports clean signal amplification with minimal unwanted coloration.
Its ≥100dB A-weighted signal-to-noise ratio helps reduce background noise, while a typical damping factor of 1000 at 8Ω supports controlled loudspeaker movement and stable low-frequency performance.
The input sensitivity can be selected between 0.775Vrms and 32dB gain, allowing the amplifier to integrate with different professional audio processors, mixing consoles and system controllers.
Parameter | Specification |
Model | DA2.5 |
Rated Power at 8Ω Stereo | 2×500W |
Rated Power at 4Ω Stereo | 2×750W |
Rated Power at 8Ω Bridge | 1×1125W |
RMS Output Voltage | 63.2V |
Input Sensitivity / Gain | 0.775Vrms / 32dB selectable |
THD+N | Typical 0.01% at 10% rated output, 1kHz, 8Ω |
Crosstalk Suppression | ≥75dB below rated power, 20Hz–1kHz, 8Ω |
Frequency Response | Typical ±0.5dB at 10% rated output, 20Hz–20kHz, 8Ω |
Input Impedance | 20kΩ balanced / 10kΩ unbalanced |
Damping Factor | Typical 1000 at 8Ω, 20Hz–20kHz |
Signal-to-Noise Ratio | ≥100dB, A-weighted, 20Hz–20kHz, 8Ω |
Main Power Supply | 100–240V AC ±10%, 50/60Hz |
The stereo operating modes allow the amplifier to drive two independent loudspeaker channels. For applications requiring higher output from a single channel, the DA2.5 can be configured in 8Ω bridge mode. Loudspeaker impedance, wiring and power-handling capability should be checked before bridge-mode operation.
The DA2.5 is housed in a compact 1U rack-mount chassis, helping reduce the amount of equipment-rack space required for professional audio installations.
The chassis measures 483 × 45 × 299mm and has a net weight of approximately 5.0kg. Its compact and lightweight construction simplifies transportation, rack installation and system maintenance, particularly in projects with limited equipment-room space.
The modular internal design supports an organized component layout, while active PFC and soft-switching power-supply technology improve adaptability to different mains-power conditions. The amplifier supports a wide input-voltage range of 100–240V AC at 50/60Hz, allowing it to be used in different regions and installation environments.
Built-in protection functions help safeguard the amplifier and connected loudspeakers during abnormal operating conditions. The published protection functions include:
● Overheating protection
● Overload protection
● Direct-current protection
Adequate rack ventilation and correct load matching should always be maintained to support stable long-term operation.
Physical Specification | Value |
Rack Height | 1U |
Dimensions | 483 × 45 × 299mm |
Package Dimensions | 550 × 435 × 115mm |
Net Weight | 5.0kg |
Gross Weight | 5.2kg |
Protection Functions | Overheating, overload and direct current |
The DA2.5 is designed primarily for professional fixed-installation sound systems. Its two-channel configuration, flexible output modes and compact chassis make it suitable for a variety of commercial and entertainment applications.
Application | System Requirement | DA2.5 Advantage |
Conference Rooms | Clear speech reproduction and low background noise | Low distortion and a high signal-to-noise ratio support speech intelligibility |
Auditoriums and Theaters | Stable amplification across a wide frequency range | The 20Hz–20kHz frequency response supports both speech and program audio |
KTV Rooms and Bars | Continuous output for music and entertainment systems | Up to 2×750W at 4Ω provides practical power for compatible loudspeakers |
Commercial Performance Spaces | Flexible output configurations and reliable operation | Stereo and bridge modes support different system designs |
Hotels and Restaurants | Compact equipment installation | The 1U chassis reduces rack-space requirements |
Schools and Multipurpose Halls | Amplification for presentations, microphones and recorded audio | Two independent channels simplify common installed-audio configurations |
Commercial Facilities | Long-term fixed installation | Wide-range power input and built-in protection support system stability |
The DA2.5 can be integrated with professional mixing consoles, digital signal processors and compatible passive loudspeakers. Amplifier output power, loudspeaker impedance and system-processing requirements should be matched according to the needs of each project.
The DA2.5 focuses on the requirements that matter most in professional installed systems: practical output power, compact rack dimensions, wide mains compatibility and clearly specified audio performance.
Its two-channel design supports common stereo and dual-zone configurations, while the bridge option provides additional flexibility for projects requiring a higher-powered single output. Active PFC, soft-switching technology and built-in protection functions further support stable operation in permanent installations.
For system integrators, distributors and installation contractors, the DA2.5 offers a straightforward amplification solution that can be incorporated into conference, entertainment, commercial and multipurpose audio systems.
The DA2.5 delivers 2×500W at 8Ω stereo, 2×750W at 4Ω stereo, and 1×1125W in 8Ω bridge mode.
Yes. It is classified as a 1U digital amplifier and measures 483 × 46 × 299mm.
Yes. The amplifier is rated at 2×750W in 4Ω stereo mode. The total impedance of the connected loudspeakers must remain within the specified operating load.
Yes. The DA2.5 is rated at 1×1125W in 8Ω bridge mode. Bridge wiring and loudspeaker impedance must be configured correctly.
The published protection functions include overheating protection, overload protection and direct current protection.
The DA2.5 supports 100–240V AC with a ±10% tolerance at 50/60Hz.
It is developed primarily for professional fixed installations, including conference rooms, auditoriums, entertainment venues, commercial facilities and multipurpose halls.
