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35 years in business
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Head unit amplifiers (whether OEM or aftermarket) soon reveal their limits in terms of power and dynamics. At high volume, they soon saturate and ruin the listening pleasure. To compensate for this and to enable you to get the best out of your speaker drivers, Impulse 4.320 is the ideal solution.

The technology used for Impulse 4.320 was inspired by the Performance range’s FD amplifiers.

With an efficiency of more than 90%, Class D amplification has numerous advantages: less heat, low power consumption, low distortion at high volumes, compact… With the Impulse 4.320 amplifier, an unbeatable size/power ratio has been achieved. It delivers 4 x 55 or 2 x 160 Watts RMS at 4 Ohms.

Thanks to the adequate power and the fast attack for realistic and more aerated sound, it will completely transform the sound of your front and rear speaker drivers.

Impulse 4.320 – Cables Measuring only 67/8 x 17/8 x 25/8? (17.65 x 4.6 x 6.7 cm) Impulse 4.320 can easily be concealed within the dashboard or the centre console.

Equipped with high-level (automatic detection feature) and low-level inputs, it is compatible with all head units. Supplied with all fastenings, an adaptor for the head unit’s speaker driver outputs, RCA adaptors for aftermarket head units and power connector, this amp was specially designed to be easy to install. No direct hook up to the vehicle’s battery is required.

An optional ISO connector is available for “Plug&Play” connectivity via the head unit’s harness.

Note: On certain cars, a harness adapter may be necessary.

To ensure compatibility with different head units, this amplifier features a 2-channel or 4-channel input selector switch.

Most of all, Impulse 4.320 has been designed to power front and rear speaker drivers. However, it can also be used in a 3-channel or 2-channel mode in order to meet all needs for improving small installations and it can also be used for powering the front speaker drivers and a small subwoofer.

Each pair of channels features an active crossover to adapt the sonic response according to the speaker drivers used. The front channels can be used for wideband speaker drivers or the high-pass filter can be used for frequencies above 75 Hz when only small speaker drivers are used. By avoiding having small speaker drivers reproduce very low frequencies, the sound will have more clarity. The rear channels are equipped with an active crossover (wideband, high-pass or low-pass) and with progressive phase adjustment for powering a small subwoofer or wideband speaker drivers of different sizes.

Other Details
  • Refund & Returns Policy

    GL Pro Sound prides itself on supplying high quality goods and the highest levels of customer service. We are happy to serve you at the highest level, especially in the case of an issue with the goods you have purchased. Please email us at within the warranty period so that we can address any problems, faults or issues.

    In accordance with ACCC guidelines, we will endeavour to fix any problem, fault or issue with a good or service provided by us, within a reasonable timeframe, provided you retain your proof of purchase, have not abused or tampered with the product or service in question, or have not simply changed your mind or found it cheaper elsewhere. Also, you are not covered in the case that the issue, problem or defect was explained to you upon sale or delivery of the goods/services.

    In the event that the product is not repairable, we will replace the product.

    In the event that the product cannot be replaced, or an acceptable replacement cannot be agreed upon, you are entitled to a refund, or an applicable store credit if you would prefer.

    All postage and insurance costs are to be paid by the buyer. We recommend that you return the product via Registered post and that you prepay all postage.

    You assume any risk of lost, theft or damaged goods during transit; therefore we advise you take out shipment registration of insurance with your postal carrier. GL Pro Sound will not be responsible for parcels lost or damaged in transit if you choose not to insure.

    The ACCC regulations and guidelines on the above, as well as a link to the Australian Consumer Law Consumer Guarantees can be found here:

    If you have any enquiries regarding this document and/or the payment services offered by us through Shopify Payments, please email us at


    Shipping Policy

    Gl Pro Sound will ship in stock goods within 48hrs some goods may be subject to be shipped within 14 days of receiving the order. All orders are shipped via Sendle. If goods cannot be processed a full refund will be offered. Shipping rates are $15 Aud flat rate 20kg and under. Over 20kgs will be calculated at checkout. If you have any queries please email

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