Focal Impulse 4.320 4 Channel Amplifier, 80 Watts x 4 at 2 Ohms
$499.99 CAD
IMPULSE 4.320
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Expert Verdict (2026) - Why Buy?
This is the Focal Impulse 4.320 4 Channel Amplifier.
With the Impulse 4.320 amplifier, breathe new life into your car radio. The amplifier of a car radio (standard equipment or purchased subsequently) very quickly admits its limits in terms of power and dynamism. At high sound levels, it quickly goes into saturation and spoils the musical pleasure. To compensate for this lack and allow your speakers to express themselves fully, the Impulse 4.320 is the ideal solution. It will boost your installation without the need for complicated assembly. Semi “Plug and play”, the Impulse 4.320 is a 4-channel digital micro amp, delivering 4 x 55 Watts. The Impulse 4.320 perfectly complements the Focal Integration speakers.
Focal Inside
The perfect sound for your vehicle
With more than 50 brands and 1,000 vehicle models covered, the Focal Inside range offers tailor-made configurations ensuring perfect compatibility.
Replace your vehicle’s audio system easily without modifying the interior by choosing a Plug & Play hi‑fi solution.
Add amplification and subwoofers for a richer sound experience and impactful bass.
Why the Focal Inside Impulse 4.320 is the Micro-Amplifier Benchmark:
Microscopic Footprint & Hidden Mounting: This is the primary "Information Gain." Measuring an incredibly slim 6-15/16" x 1-7/8" x 2-5/8", this amplifier completely bypasses the need to run thick power cables down to your trunk or beneath the seats. Its micro-chassis is small enough to hide directly behind the factory dashboard screen or inside the center console panel, drastically shortening wire paths.
Efficient Class D Technology Architecture: Derived directly from Focal's high-tier Performance Series, the Impulse 4.320 features an electrical efficiency rating exceeding 90%. This prevents the unit from producing intense heat, meaning it can live safely in cramped dashboard voids while keeping power draw low enough that it doesn't require a direct-to-battery wiring run in short-run installations.
High-Level Sensing & Automatic Turn-On: You do not need an aftermarket receiver or a manual 12-volt accessory trigger to enjoy audiophile sound. Equipped with advanced signal-sensing high-level speaker inputs, the amp taps directly into your factory wiring loom and awakens automatically the exact split-second your radio turns on.
Dynamic 4/3/2 Channel Configuration Setup: The internal layout is incredibly adaptive. Run it in 4-channel mode to supply 55 Watts RMS to your front and rear doors, or shift it into 3-channel mode to push 55 Watts RMS x 2 to your front components while bridging the rear channels to push a clean 160 Watts RMS to a small, space-saving subwoofer setup.
Precision Built-In Crossover Tuning: Tailoring the acoustic response to your exact speaker diameters is easy. The front channels feature a switchable 75Hz high-pass filter to prevent small door speakers from distorting on heavy bass notes. The rear channels include a fully adjustable 40-200Hz high/low-pass filter matrix combined with an integrated progressive phase selector (0-180°) to perfectly time-align sub-bass frequencies.
Specifications
Specifications
