Focal Impulse 4.320 Compact 4-Channel Digital Amplifier


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Give your head unit a breath of fresh air and get some oomph into your speakers by installing this 4-Channel Digital Amplifier from Focal. Head units soon reveal their limitations in terms of power and dynamics. At higher volumes, they soon saturate and ruin the listening pleasure. Upgrading the speakers in search of better sound is not always the answer since a high-quality speaker needs more power behind it to optimise their performance. The Focal Impulse 4.320 Ampflier provides the ideal power uplift solution for your in-car audio.

The Impulse 4.320 adds the wow factor despite its diminutive appearance. The footprint of the amp is barely bigger than a mobile phone, allowing you to seriously upgrade the sound in your vehicle without taking up precious space.The Impulse 4.320 is a miniature 4-channel digital amplifier delivering 4 x 55 Watts from a super compact footprint. The units’ dimensions (175x66.5x47mm) are ideal for concealing the amp inside your Land Rover. Mount it in the cubby-box, within the battery box or inside a MUD cubby locker.The Focal Impulse amp is supplied with a mini-wiring harness that will need connecting into the vehicle wiring and audio wiring. We would strongly recommend paying for a professional install of this amplifier.

Alternatively, you can ditch the wiring supplied in the box and upgrade to Focal’s dedicated Plug & Play Impulse 4.320 Y-Harness that provides a simple non-invasive ISO plug and play connectivity between the amplifier and your head unit. No need for a professional install, just plug the connectors into the amplifier at one end of the harness, and piggy-back off the ISO connections at the head unit end. Job Done!Another advantage of the Impulse Y-Harness is that it will also a provide a ‘plug & play’ ISO connection to any Focal iBus or iSub sub-woofer power harness to provide seamless integration of all Focal components. No matter whether you already have a Focal Sub-Woofer or you’re thinking of adding one at a later date, the Impulse Y harness makes the install a breeze.

Key Points

EA power (4 Ohms):

4x55Wrms Power max (2 Ohms):

4x80Wrms Power bridged (4 Ohms):

2x160Wrms Bandwidth:

10Hz / 20KHz Minimum

THD: 0.02%

SNR: 80dBA

Weight: 544g

Dimensions: 175x66.5x47mm

For full spec please see the resources section below.

We know that when you shop online you want your order as soon as possible. Choose DHL shipping in the checkout and order before 2pm then you’ll get your stuff the next working day.

On smaller items we also offer a 2nd Class postage service. This normally takes 2-3 working days to show up at your door. If you’re in a rush go for the DHL option for a fully tracked service.

Big Stuff! Unfortunately, our Side Panels, Bulkhead Bars and longer lengths of Cargo Tracking are too big for DHL to handle. We generally use UPS or Fed-Ex but that’s on an ad-hoc basic so you need to order before 12 to get a next day service.

We charge the same rate to any UK address, which includes Highlands and Islands and Northern Ireland. We do this because we think its unfair to charge more just because you live remotely, lets be honest if we could, we’d live there too. In exchange please be patient if your parcel takes more than one day to arrive.

European Shipping

We use DHL to ship to all our European customers, this can range from a 1-5 working day service. The good news is most parcels arrive within 3 days of shipping. If you’re lucky enough to live in France, Germany or Belgium you might even get your parcel the next day.

Once you’ve ordered DHL will be in touch by email with tracking details. If you’ve chosen Royal Mail shipping then you should receive your parcel in around 10 working days (note this can be up to 28 working days).

VAT Numbers: If you have a VAT & EORI number please contact us before you check out.


Important information for customers within the European Union

Following the UK’s withdrawal from the European Union there have been changes to import and export practices. Customers within the EU will no longer pay UK Tax. 

When the parcel arrives within your country you may be liable to pay both local VAT, import duty and admin charges. Please do not ask us to estimate the cost of any additional costs once the parcel has the left the UK. These charges are levied locally, they will vary from country to country.

As the buyer you are responsible for paying these charges, which must be paid before your goods are delivered. If you decline to pay the charges then the goods will be returned to us. Goods returned as a result of payment failure will be refunded. Please note we can only refund the cost of your original order. Delivery costs will not be refunded. Refused parcels may also levy re-entry fees into the UK, they will also be deducted from your refund. If you are thinking of rejecting a parcel due to customs charges, we strongly recommend you contact us first before you reject the parcel. 

If you require further information, we recommend contacting your local tax office.

Please Note: If you live in The Alps or somewhere equally beautiful and hard to get to, we might have to use DPD or TNT to deliver. They should be just as quick.

USA & Canada Shipping

American & Canadian customers can expect a 2-3 working day service with DHL, depending on whether your East or West Coast.  DHL will be in touch via email with all the info you need once you’ve placed your order.

Rest of the World Shipping

The good news is we ship to pretty much everywhere (we don’t ship to Russia, sorry!).

The best service to choose is DHL, most parcels are delivered within 4 working days. This service is fully tracked and DHL will email you with all the details as soon as they’ve collected your ‘stuff’

If your parcel is light enough, you’ll be offered Royal Mail shipping in the checkout process. This will be delivered locally by your nearest post office. We’ve found that some countries have better postal systems than others. It can take up to 20 working days for post to arrive, so if you are in a rush please choose DHL in the checkout.

Customs & Duties

All packages imported to your country may be subject to customs, taxes or other fees. You are responsible for all applicable customs, duties, taxes and fees charged by your government.

We cannot guarantee that you will or will not be charged any customs taxes or duties.

If you’re worried about possible charges please contact your country's customs office prior to purchasing for respective charges and rates on packages coming from outside of your country.

If you decline parcels locally due to customs duty/tax charges then the goods will be returned to ourselves. Note this will incur further charges which we will debit from your refund, this can often be more than the original customs charges so we would advise you not to do this. If you have made a mistake with your order/ cannot pay the import duty charges then please get in contact with us and we will try to work out the best way forward for you.

Note: Please don’t ask us to declare your goods as a gift, or to value your items at less than they are worth. We’d love to be able to help you out, but we don’t want to end up in jail!

Returns & Exchanges

You can return items that you are not happy with within 28 days from purchase. If you’d like to return something or you believe you have a faulty item please contact us via email and we we’ll do our best to resolve the issue with as little fuss as possible.

Once we receive your returned parcel, we will process everything accordingly and keep you updated via email. We aim to refund customers the same day that an item is returned. If you originally paid by PayPal then you should receive the refund instantly. However, if you paid by sage pay using a credit or debit card it can sometimes take a few days for refunds to be credited.

If you believe you have received something in error or a part is missing from your delivery please contact us immediately. Packing errors can only be rectified if we have been informed of the error within 28 days of the parcel being received.

Payment & Security

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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

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