IMPULSE 4.320 | Compact 4-Channel Digital Amplifier – Focal Integration Series
NOTE:
- Plug and play compatibility will depend on harnesses available for selected vehicles.
- Secondary 3rd party vehicle harness may be required.
- Products and compatibility may change without notice.
- To ensure correct product and vehicle compatibility please contact your nearest Focal Car Audio Australia Authorised Dealer.
Compact Power. Pure Efficiency. Plug & Play Precision.
The Focal Impulse 4.320 is a compact 4-channel digital amplifier engineered to breathe new life into factory or aftermarket head units.
With 4×55 Watts RMS at 4 Ohms, it delivers the dynamic, distortion-free power your speakers need to reach their full potential — without complex wiring or installation.
Designed for OEM integration and simplicity, the Impulse 4.320 installs seamlessly behind your dash or centre console, transforming your car’s sound system with clean, detailed, and powerful output.
Next-Generation Class D Performance
Built on Focal’s FD amplifier technology platform, the Impulse 4.320 achieves over 90% efficiency, minimising heat and power draw while maximising output.
The result is fast transient response, low distortion, and a rich, open soundstage — all from a chassis measuring just 17.65 x 4.6 x 6.7 cm (6.9″ x 1.8″ x 2.6″).
Delivering 4x55W RMS or 2x160W RMS bridged at 4 Ohms, it’s the ideal amplifier for powering front and rear speakers or driving a 2-way system with a compact subwoofer.
Whether you’re upgrading an OEM setup or fine-tuning a hi-fi installation, the Impulse 4.320 offers uncompromising clarity in a truly compact form.
Effortless Installation and Integration
The Impulse 4.320 is designed for semi Plug & Play installation with no need for direct connection to the battery.
It includes:
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High-level inputs (with auto signal detection) for OEM head units
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Low-level RCA inputs for aftermarket systems
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All cables, power connectors, and mounting hardware for quick setup
An optional ISO harness (sold separately, $65.00) allows Plug & Play connection directly behind the factory head unit — no soldering, no cutting, no modifications.
This makes it one of the cleanest amplifier installs available today for both enthusiasts and professional installers.
Flexible Configuration for Every Setup
The Impulse 4.320 features 2-, 3-, and 4-channel modes, offering the versatility to power a full-range system, front speakers and subwoofer, or a compact dual-amp configuration.
Each channel pair includes an active crossover for precise tuning:
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Front channels: Full-range or high-pass above 75 Hz
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Rear channels: Full-range, high-pass, or low-pass (for subwoofer use)
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Progressive phase control for perfect time alignment with mixed driver sizes
With its tailored filtering and tuning options, the Impulse 4.320 delivers balanced, dynamic sound — from clean highs to full-bodied low end.
Key Features
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4 x 55W RMS @ 4Ω / 2 x 160W RMS bridged
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Class D digital amplifier – >90% efficiency
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Compact size: 17.65 x 4.6 x 6.7 cm (6.9″ x 1.8″ x 2.6″)
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High-level & low-level inputs (auto signal detection)
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Optional ISO Plug & Play harness for factory integration
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Active crossovers for each channel pair
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No battery connection required
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Compatible with all head units
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Designed to pair perfectly with Focal Integration and Inside speakers
Focal Integration – Clean Power, Compact Design
The Impulse 4.320 embodies Focal’s integration philosophy: OEM compatibility, compact design, and uncompromising sound quality.
It’s the ideal solution for anyone who wants a dramatic upgrade in clarity, depth, and impact — without tearing their vehicle apart.
Plug it in. Power it up.
Experience true Focal performance — refined, powerful, and effortless.
