Funktion-One FFA6004 – 4-Channel High-Power Amplifier (Touring & Installation Systems)

The Funktion-One FFA6004 (commonly associated with Funktion-One systems but manufactured by Full Fat Audio) is a high-performance 4-channel Class-D power amplifier engineered for demanding touring and installation environments, delivering clean output, high efficiency, and reliable multi-channel power distribution.

Designed in the UK by Full Fat Audio and widely used with Funktion-One systems, the FFA6004 is built for large-scale sound reinforcement, stage monitoring, and multi-way loudspeaker configurations where stability, headroom, and efficiency are critical.

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Key Specifications

Amplifier Type: 4-channel Class-D amplifier

Channels: 4 independent amplifier channels

Output Power:

• 4 × 1500 W @ 4 Ω
• 4 × 900 W @ 8 Ω

Frequency Response:

• 20 Hz – 20 kHz (±0.5 dB)

THD (Typical):

• ~0.05% @ 4 Ω

Gain:

• 32 dB

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Physical & Mechanical Details

Form Factor: 2U rackmount (19″ standard)
Dimensions: ~88 mm × 483 mm × 510 mm
Weight: ~10 kg

Construction:

• Rugged aluminium touring chassis
• Designed for high durability under transport conditions

Cooling System:

• High-efficiency fan cooling with variable speed
• Rear-to-front airflow for stable thermal management

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Key Features & Configuration

High-Efficiency Class-D Design:
The amplifier uses proprietary Class-D topology, allowing:

• High power output with low heat generation
• Reduced energy consumption
• Stable performance under continuous load

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4-Channel Architecture:
Provides flexible system design, enabling:

• Multi-way loudspeaker configurations
• Bi-amp or tri-amp setups
• Reduced amplifier count in racks

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High Current Power Supply:
The integrated switch-mode power supply ensures:

• Stable operation under fluctuating power conditions
• High current delivery for demanding speakers
• Reliable performance in touring environments

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Touring-Grade Construction:
Designed for real-world use with:

• Lightweight chassis (~10 kg)
• Robust mechanical design
• Long-term reliability on the road

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Connectivity & Signal Flow

Inputs:

• Balanced XLR inputs (per channel)
• XLR link outputs for signal pass-through

Outputs:

• Neutrik SpeakON connectors (per channel)
• Bi-amp capable wiring via 4-core speaker cable

Power Input:

• Neutrik PowerCON connection
• Designed for professional touring power distribution

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Protection & Reliability

Protection Systems Include:

• DC output protection
• Short circuit protection
• Thermal shutdown
• Overcurrent limiting

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Clip Limiting

• Side-chain TCA clip limiter prevents signal distortion
• Protects connected loudspeakers during high-output operation

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Practical Reliability Advantage

• Stable performance during long events
• Reduced risk of system failure
• Protection for both amplifier and speakers

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System Integration

The FFA6004 is typically used with:

• Funktion-One loudspeakers (Resolution, Evolution series)
• Multi-way systems requiring dedicated amplification
• External DSP or crossovers (XO2, XO4, or third-party processors)

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Typical Configuration

• 1 × amplifier driving multiple frequency bands
• Separate channels for LF, MF, and HF sections
• External DSP handling crossover and system tuning

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Real-World Setup Example

• 1–2 × FFA6004 amplifiers for mid/high sections
• Additional amplifiers for subwoofer systems
• External controller managing system alignment

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Performance Characteristics

The FFA6004 is known for:

• Clean, transparent amplification
• High headroom and dynamic range
• Strong transient response
• Consistent performance under load

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Field Insight

In Funktion-One systems:

• The amplifier delivers a “tight and controlled” sound character
• Maintains clarity even at high SPL levels
• Works best when paired with high-quality external processing

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Ideal Applications

Touring sound systems
Large-scale club installations
Festival and outdoor events
Stage monitoring systems
Multi-way loudspeaker configurations

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System Advantages in Practice

Efficiency:
High power output with reduced energy consumption.

Flexibility:
4 channels allow complex system configurations.

Reliability:
Designed for continuous touring operation.

Scalability:
Easily integrated into small or large systems.

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Summary

The Funktion-One FFA6004 is a high-output 4-channel amplifier delivering clean power, efficiency, and touring-grade reliability, designed for demanding professional audio systems.

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Bottom Line

For professional audio applications in Europe, the FFA6004 provides a powerful and flexible amplification solution, particularly suited for multi-way Funktion-One systems where performance, control, and reliability are essential.