FOCAL BUS 20 User Manual

BUS 20 & BUS 25

User Manual

Thank you for choosing Focal. To get the best results from your speaker, please
ensure you follow these recommendations, and keep carefully this user manual
so that you can consult it later. If not followed correctly any fault observed may
not be covered by the guarantee.

Français page 7

THE FOCAL GUARANTEE ONLY APPLIES IF PAGE 8 IS
RETURNED TO US WITHIN 16 DAYS OF PURCHASE.

Focal® is a trademark of Focal-JMlab® - BP 374 - 108, rue de l'Avenir - 42353 La Talaudière
cedex - France - Tel. [phone] - Fax [phone] - www.focal-fr.com

Due to constant technological advances, Focal reserves its right to modify specifications without notice. Images may not conform exactly to specific product.

BUS 20 & BUS 25

User Manual

Precautions

For the subwoofer to perform at its best, we recommend to use it in a location where temperature
doesn’t go below 5°C.

• The location must also be dry and well-ventilated.

• The supply voltage requirement is 12VDC (13.8VDC) with the negative connection grounded.
Please make sure that the characteristics of your vehicle correspond with this requirement
before connecting the equipment.

• For safe driving, we recommend that you operate your sound equipment at a listening level
that does not drown out traffic noise.

Warning!

The performance of the Bus 20 and Bus 25 (Bomba under seat) allows high sound pressure
levels to be generated. We remind you that sustained listening beyond 110dB SPL can
permanently and irreversibly damage your hearing.
We recommend that you adjust the level of your equipment correspondingly.

For safety reasons, it is essential that you securely fix the subwoofer enclosure in the boot
(make sure you do not drill through the petrol tank if you fix it with screws).

Supplied elements

• 1 remote control with 5m (16Ft) cable

• 1 user manual

• 4 fixing clamps

• 4 screws M4*20

• 4 screws M6*8

2

• 1 power supply kit that contains

5m (16Ft) cable for the remote 0.5 mm2 (20 AWG) (blue and white)
5m (16Ft) cable for high level input 4 x 0.5 mm2 (4 x 20 AWG) (grey)
5m (16Ft) cable for the battery 3.3 mm
1,40m (4,5Ft) cable for the ground 2 x 1.3 mm
1 10A fuse placed in the fuse box

Cable routing

The 12V supply cables should be passed down on one side of the vehicle and the signal cables
down the other. These cables must be suitably protected to avoid any damage to insulation,
especially when feeding the cable through from the engine compartment to the passenger
cabin.

2

(12 AWG) (yellow)

2

(2 x 16 AWG) (black)

BUS 20 & BUS 25

User Manual

Installation

We included a fixing kit to ensure the subwoofer remains securely mounted. Two types of
installation are possible.

In the trunk

1 - Rear seats must be positioned in their normal fixed position.
2 - Decide the best location possible that suits your automobile and space available. The best

and most secure location for optimum sound quality is behind the rear seats, in the trunk
floor.

3 - Ensure the area for subwoofer location is clean and tidy. Any loose objects must be

removed, as they could knock and damage the subwoofer.

4 - Once the location has been decided, mark the screw hole positions for the fixing

brackets.
5 - Drill holes of 2 mm for the 4 fixing brackets, at your defined locations.
6 - Fix the clamps to the subwoofer basket with the four screws M6*8 (the fixing clamps have

a mounting direction system).
7 - Position the subwoofer so that the holes correspond to the M4*20 supplied screws and fix it.
8 - Please make sure the subwoofer is tightly fixed.

Under a seat

1 - The seat must be positioned in its normal fixed position.
2 - Decide the best location possible that suits your automobile and space available, checking

that the enclosure doesn’t hamper the seat mobility.
3 - Ensure the area for subwoofer location is clean and tidy. Any loose objects must be

removed.
4 - Once the location has been decided, mark the screw hole positions for the fixing

brackets.
5 - Drill holes of 2 mm for the 4 fixing brackets, at your defined locations.
6 - Fix the clamps to the subwoofer basket with the four screws M6*8 (the fixing clamps have

a mounting direction system)
7 - Position the subwoofer so that the holes correspond to the M4*20 supplied screws and fix it.
8 - Please make sure the subwoofer is tightly fixed

3

BUS 20 & BUS 25

User Manual

Power supply

(+) The 12V power supply (BAT) is made on the battery with the supplied yellow cable, the
extremity that contains the black fuse box is connected to the battery.

(-) The ground wire (GND) must be connected to the chassis of your vehicle with a perfect
electrical connection (remove some paint to reveal bare metal if necessary) and with the
supplied ground cable.

Connect the remote cable (REM) to the electrical aerial output or to the remote output of your
radio with the supplied remote cable.

Low level input (RCA) (1)

Connect to the RCA output of the car radio.

High-level input (2)

Connect to the loudspeaker outputs of the radio.

Never connect the RCA and the high-level inputs together.

Adjusting the sound level (3)

The sound level setting allows you to match the level of the subwoofer with the level of the
front system.
There are two possibilities.
Without the remote control: The only way to adjust the amplifier gain will be to turn the gain
potentiometer with a screwdriver.
With the remote control: Connect the remote control to the amplifier (6) and place it at hand
in order to be able to change the sound level; turn the gain screw in 3/4 position on the
amplifier. You will then be able to change the sound level of your subwoofer thanks to the
remote control.

4

Phase inverter (4)

It allows you to phase the subwoofer (generally advised) or to put it off phase. The right setting
is determined by listening and finding the one (matching with the front system) that provides
more bass.

Adjustable cut-off frequency (5)

An electronic crossover suppresses the midrange and treble frequencies beyond a threshold
set by the user. The ideal is to extend the bass frequencies in an even and continuous manner
from where the front system rolls off. In general, a cut-off frequency located between 80 and
100Hz should be suitable for most systems.

BUS 20 & BUS 25

User Manual

A B

Installations
In the trunk Under a seat

5

C D