What is a subwoofer and how to connect it ?

A subwoofer is a loudspeaker specifically designed to reproduce low and extreme low frequencies that cannot be reproduced by a coaxial loudspeaker or 2-way kit. It helps enhance the low-frequency response in your living room or car.

When you connect a Focal subwoofer to your sound system, you have two main options depending on your configuration:

Low-level RCA input

For two-channel amplifiers with "Pre-out" line outputs, you can use the subwoofer's stereo RCA "Line inputs Right (R) / Left (L)". This option is ideal for a stereo configuration.

LFE input

For multi-channel audio/video amplifiers, connect the subwoofer's single LFE "Low-Frequency Effects" input to the amplifier's dedicated "subwoofer" output. This configuration is ideal for multi-channel home cinema systems.

It's also important to note the operation of the "Auto Standby" mode. This mode automatically switches the subwoofer on and off.When the "Auto Standby" switch is activated, the subwoofer switches on automatically as soon as an audio signal is detected at the input. In "Disable/OFF" mode, the detector is deactivated, keeping the subwoofer permanently switched on.

If no audio signal is detected at the subwoofer input for around twenty minutes, the detection system automatically switches the subwoofer to standby mode. If you're planning an extended absence, it's advisable to set the power switch to the "Off" position.

Car audio

It's common practice to install a subwoofer in a trunk, mainly for reasons of space.Please note, however, that our subwoofers are not "free-air" models intended for installation under a rear parcel shelf, for example. We strongly advise against making cut-outs in the sheet metal of the rear decks of three-box sedan models.This could compromise the car's rigidity.Our subwoofers are designed to operate in dedicated enclosures: they cannot be installed as they are.

For an optimal audio experience and to preserve your vehicle, carefully follow our installation recommendations.

Cable selection

To connect the subwoofer to the amplifier, use a shielded RCA/RCA cord of suitable length. If in doubt, ask your dealer for advice to find the best solution for your needs.


Unlike a loudspeaker, which must be far enough away from the walls and corners of the listening room, we recommend placing the subwoofer in a corner.

By placing the subwoofer in a corner, the room's resonances will be more linear.Not only will bass perception be optimal, but this arrangement will also increase the bass level.If layout constraints prevent you from placing the subwoofer in a corner, try different positions in the room until you find the best possible compromise.

Generally speaking, the subwoofer should be placed at the front of the listening position.

Placing it at the rear is not recommended. As the frequency bands concerned are omnidirectional, the bass is in principle unaffected by any object or piece of furniture placed between the subwoofer and the listening point.

Break-in period

The loudspeaker in your subwoofer is a complex mechanical element that requires a break-in period to perform at its best and adapt to the temperature and humidity conditions of your environment.

This period varies according to the conditions encountered, and can extend over several weeks.

To accelerate this operation, we recommend that you run the subwoofer for around 20 hours at medium level, on bass-rich music programs.Once the speaker's characteristics have fully stabilized, you'll be able to take full advantage of your subwoofer's performance.

Focal Subwoofer


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