FPX 4.400 SQ | 4-Channel Class AB Amplifier – Sound Quality Performance Series
Audiophile Power in a Compact Design
The Focal FPX 4.400 SQ is a 4-channel Class AB amplifier designed for exceptional musicality and precision. Delivering 4 × 70W RMS at 4Ω, this compact powerhouse is ideal for enthusiasts seeking clean, dynamic sound and detailed reproduction across all frequencies.
Compact, powerful, and versatile, the FPX 4.400 SQ brings studio-grade sound quality to any vehicle installation while maintaining the refined tonal balance that defines Focal Performance amplifiers.
Class AB Amplification – Pure Sound Fidelity
Engineered for sound quality above all, the FPX 4.400 SQ employs a Class AB topology known for its warmth, linearity, and natural tonality. This configuration ensures rich midrange, smooth treble, and tight, controlled bass — the perfect complement to Focal speaker systems.
It’s the amplifier of choice for audiophile-grade in-car listening, combining sonic refinement with robust power delivery.
High Power, High Versatility
Operating in 4/3/2-channel mode, the FPX 4.400 SQ adapts easily to a wide range of setups:
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Drive front and rear speakers for a full-range system.
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Power a 2-way front kit and subwoofer using bridged channels (2 × 200W RMS at 4Ω).
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Run 4 × 100W RMS at 2Ω for higher-output multi-speaker configurations.
Its 2-/4-channel input mode ensures full compatibility with factory or aftermarket head units, even those offering only a single pair of RCA outputs.
Active Crossovers for Precise Tuning
For complete system control, each pair of channels includes an active crossover adjustable from 50 to 500 Hz, offering high-pass, low-pass, or full-range modes.
Channels 3 and 4 feature bass boost controls, providing additional tuning flexibility for front-stage enhancement or subwoofer optimisation.
This flexibility ensures precise sound tailoring, regardless of speaker configuration or listening preference.
Compact and Installation-Friendly
Despite its high output and audiophile design, the FPX 4.400 SQ maintains a compact footprint, ideal for discreet installation in tight spaces — under seats, behind panels, or in the boot. Its heavy-duty aluminium chassis ensures excellent thermal management and mechanical stability, keeping performance consistent even under demanding conditions.
Technical Specifications
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Amplifier Type: Class AB
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Power Output: 4 × 70W RMS (4Ω), 4 × 100W RMS (2Ω), 2 × 200W RMS (4Ω bridged)
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Frequency Response: 10Hz – 30kHz
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Signal-to-Noise Ratio: >100dB
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Crossover: Adjustable 50Hz – 500Hz (high-pass/low-pass/full-range)
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Bass Boost: +6dB (ch. 3/4)
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Input Mode: 2-/4-channel
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Dimensions: Compact chassis for flexible installation
Focal FPX SQ – Power Meets Precision
The FPX 4.400 SQ represents the sound quality benchmark in Focal’s Performance amplifier lineup. Its pure Class AB design, refined tuning flexibility, and compact footprint make it the perfect choice for enthusiasts demanding the richness and accuracy of hi-fi sound in a car environment.
Experience Focal FPX SQ — compact power, superior control, and audiophile-grade fidelity.
