Installing a Car Audio amplifier

FPS Focal Power Symmetric example.


The below section deals with issues regarding the vehicle which are necessary to take into account for the installation of the amplifier. You’ll save time by planning the system layout and wiring in advance. Please ensure during this preparatory time that the whole settings remain accessible once the installation is complete.


Before starting the installation, please follow these rules carefully:


  1. Voiture : débranchement de batterieAfter reading the whole manual, be sure that you have understood all the instructions before installing the amplifier.
  2. Disconnect the battery’s negative wire before starting the installation. (pic. 1).
  3. To facilitate the assembly, we strongly recommend you unwind all the wires before installing the amplifier.
  4. Put aside all the RCA cables, speakers, REM and REMOTE CONTROL {REMOTE CONTROL only with FPS 1500, FPS 2300RX and FPS 4160}, far from the power cables in order to avoid any interference
    of the signal.
  5. Use quality connectors to ensure a reliable installation and to minimise any losses of signal or power.
  6. Think carefully before drilling anything. Be extremely careful not to cut or drill the petrol (fuel) tank, the fuel, brake, hydraulic or vacuum pipes, as well as the electrical wiring.
  7. Never route a wire under the vehicle. It is absolutely imperative to install them inside the vehicle for better protection. While routing the wires, verify that they do not impair the driving of the vehicle. Cables obstructing or routing through areas such as the steering wheel, pedals (brake, accelerator and
    clutch, etc.) may be extremely dangerous.
  8. Avoid routing wires above or through sharp rims. Any wire routed through metal must be protected with a grommet. Route the wires well away from mobile parts (seat rails,…) and from sharp or pointed cutting edges. This will avoid catching or damaging the wires.
  9. Always protect the battery and electrical circuit from potential damages with the help of fuses. Install a
    fuse holder and suitable fuses on the 12V positive (+) power cable at less than 40cm from the battery terminal. Ideally, this abovementioned distance should be the shortest as possible (pic. 4).
  10. Prepare the chassis ground by scraping any trace of paint on the metal surface in order to ensure correct grounding. The grounding connections should also be as short as possible and ALWAYS connected to the metal welded to the body or the chassis of the vehicle (pic. 4). The generally chosen ground point is the one that ensures the link between the negative terminal of the battery and the chassis of the vehicle.
  11. NEVER install this product in the engine compartment of the vehicle. This will cancel the guarantee.
  12. Distane Ampli Batterie

The following installation applies to the FPS (Focal Power Symmetric) range however the stages described here are very similar for all amplifiers when fitting your vehicle with a sound system. These installation instructions are of particular interest if you are planning to embark on the installation of your Car Audiophile amplifier!

1 - Set-up and wiring

Where to install the amplifier?
The amplifier power is such that substantial heat is generated when it is operation. This is why the amplifier has to be placed in a well-ventilated area of the car.

2 - Fixing the amplifier (pic. 2)

The surface onto which you want to attach the amplifier (boot of the car, etc.) may not be smooth enough (due to bumps, ribs, etc) to make it easy or even possible to fasten the amplifier. If this is the case, we recommend that you mount the amplifier and its attachment system on a wooden base – i.e. MDF, plywood – which itself is attached to the surface in question.

  •  Position the amplifier at the desired location.
  • Mark the location of attachment holes using appropriate means – i.e. an indelible marker, a screwdriver, etc.
  • Make sure that there is nothing below the surface which could be damaged during drilling – i.e. tanks, bundles of cables, etc.
  • Remove the amplifier, making sure that you are using a 3mm-diameter drill bit, and then drill.
  • Put the amplifier back into the initial position you chose for it. Attach the amplifier using the four self-tapping screws supplied.

Think carefully before drilling anything. Be extremely careful not to cut or drill the petrol (fuel) tank, the fuel, brake, hydraulic or vacuum pipes, as well as the electrical wiring.

3 - Wiring Warning

  • If there is a doubt about your ability to install the amplifier and to cable the system properly, get a Focal distributor to do it for you.
  • Avoid routing power supply cables close to low-level input cables (RCA), to your car’s radio aerial, or to sensitive units. High-current power supply cables can cause static/interference that affects audiosignals.
  • Before you begin the connection phase of set-up, remove the vehicle battery’s negative (-) terminal (pic. 1).


3.1 - What power supply wire gauge should I use?


Tableau de section des câbles en fonction de l'alimentation


Isolate the cable

Route the low-level audio cables (RCA cable), the loudspeaker cables, the REMOTE cable, as well as the REMOTE CONTROL cable {REMOTE CONTROL only with the FPS 1500, FPS 2300RX and FPS 4160 references} ensuring to isolate them from powerful  automobile accessories, particularly electric motors (windshield wiper,…). Keep the whole length of the cables, which will be adjusted later on.


Positive power

Route the positive power cables (+). Make sure when doing so to route them opposite the cables that you have previously drawn – this is to avoid any interference. DO NOT CONNECT THE CABLE YET.


Negative power

Get hold of the negative power cable. This cable should be as short as possible and ideally should not be any longer than 1 metre, to ensure effective coupling between the amplifier and the car’s chassis. Find a suitable ground point, then sand it to remove any traces of paint or other covering and in so doing optimise the contact point. Pierce the metal that you have previously sanded, making a hole the same size as the screw you are using, making sure that there are no tank cables or any other sensitive vehicle devices nearby. Strip 1cm of cable (pic. 3) and then tin it. Screw the cable firmly down onto the amplifier’s GND terminal. Tin the other end of it and then crimp or weld it onto the terminal lug provided. Insert the terminal lug in the screw, and then put the screw and the nut in place and firmly screw-drive in.(pic. 4).


Connection phase

You can now start the connection phase of the RCA, REMOTE and speaker cables. Connect the RCA cables to the amplifier (pic. 5). When connecting RCA, be careful to respect the polarities (INPUT Left = black or white, INPUT right = red). Then connect the cable(s) to the car radio.

Connection autoradio

If the car radio is not equipped with RCA outputs, high-level to low-level adapters (speaker outputs that are used as RCA outputs) are available from all Focal distributors. These adapters will enable the cables to be connected via the car radio’s speaker outputs instead of the requisite RCA outputs, which they replace.


Now connect the REMOTE cable to the amplifier (REM terminal) screwing tightly. Connect the other end of the REMOTE cable to the car radio REMOTE terminal. Finally, connect the speaker cables to the amplifier and make sure the polarities are correct (+ with + ; - with -) by stripping 1cm of cable (pic. 3) Connect the REMOTE CONTROL cable {only with the FPS 1500, FPS 2300RX and FPS 4160 references} to the amplifier, then fix the remote control in the spot made for it (except for the FPS 2160 model).

Power supply cable

Get the positive (+) power supply cable ready for connection to the amplifier by removing 1cm of the plastic coating from the end of it (pic. 3). Tin this part of the cable using a soldering iron and tin the wire. Insert the plastic-free tinned part of it in the amplifier’s “+ BATT” terminal, then secure the cable in place by screwing it in tightly.

The cable that links the positive (+) terminal to the battery at the amplifier’s “+ BATT” binding post terminal must ABSOLUTELY be fused (see current ratings listed in the table on page 30) not more than 40cm from the vehicle’s battery. The connections on the fuse-holder must be fully insulated.

Installing the fuse holder

The implementation phase of the fuse holder for a safe installation can now be started. The fuse holder should be linked at both end of the positive (+) power cable. It should be placed close to the battery {10 to 40cm. (pic. 7)}. Remove the fuse holder taking care to remove the fuse. Fix the fuse holder’s base. Cut the red power cable between 10 and 40cm. (maximum) from the battery (pic. 7). Keep the remaining scrap cable that will be used to link the other fuse extremity to the positive terminal of the fuse holder (+) of the vehicle battery. Strip 1cm (pic. 3), then tin it. Screw the cable to the holder base terminal. Collect the remaining scrap cable. Strip 1cm (pic. 3), then tin it. Screw the cable to the other holder base terminal.

Installing the fuse holder

Do not open the amplifier, nor make any modifications to the products. There's a risk of accident, fire or electric shock.

Tin the end of the power supply cable before you connect it to the battery’s positive (+) terminal. Weld the end of the cable to the terminal lug that is going to be used for the battery’s positive (+) terminal. Connect the terminal lug to the battery’s positive terminal.

Insert the fuse into the fuse-holder(s), and screw in tightly.


The Loudspeakers

Connect the loudspeaker cables to the right and left channel crossover networks, making sure that the polarities are the same (note: + = cable with a red border if you are using a Focal kit) as those used for standard wiring set-ups. Focal amplifiers can work in bridged mode (see product specifications page 29 to know the power delivered in bridged mode) for amplifying subwoofers. To do so, simply connect the positive (+) speaker cable to the BRIDGE (+) terminal and connect the negative (-) speaker cable to the related BRIDGE (-) terminal.

When connecting several subwoofers to the same output, check for the amplifier impedance compatibility.


Installation test

The connection phase is now complete. But, you must check if the power supply is correct as well as the correct operation of the full system (car radio/amplifier/loudspeakers). Set all gains (source, amplifier) to their minimum. Turn on the different elements. Once all the elements are on, carry out a test at low volume, adjusting the various gains.

Schéma connecion ampli et hp

Le High Cap for the FPS

The High-Cap is an external power supply module. Once connected to the amplifier, it increases regulation capacitance of rail's power supply. It brings high music performance, a very high performance maintaining and an extremely high-fidelity of the audio signal. The High-Cap module is sold separately.

Connections, functions and settings

To optimise your installation, its different functions and settings, please consult the relevant amplifier instruction leaflet. All instruction leaflets can be downloaded from this website from the product pages concerned.


All Focal Car Audio amplifiers