Focal BUS 20 Manuel D'utilisation page 4

BUS 20 & BUS 25
U s e r
M a n u a l
4
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.
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.