Connecting The Power Supply - Conrad Boom 80 MkII Notice D'emploi

8. Connecting the Power Supply

The electric connection should be done by a specialist.
To avoid electrical short circuits and any resulting damage to the device, the negative terminal
(earth) of the car battery has to be disconnected when connecting the power supply.
Only connect the negative pole of the battery, when you have completely connected the system
and checked the connections.
You should only use a voltmeter or a diode test lamp for checking the voltage on the on-board
cables as normal test lamps consume excessive currents and can thus damage the electronic
system of the car.
When laying the cables, make sure that they are not squeezed or scoured on sharp edges. Use
rubber grommets for the feed-though points.
In order to reduce interference by the generator or other electric systems of the vehicle, the
subwoofer should be directly powered by the car battery. No other electrical consumers such as,
for example, the fan, the windscreen washer etc., may be supplied with current by the same cable
as the subwoofer.
Use connection cables with the largest possible diameter for connecting the power supply and
the ground of the subwoofer. The required diameter of the cable depends on the power
requirements of the components connected.
A diameter of the cables which is too small can cause a cable to char through in unfavourable
cases. Moreover, the increased ohmic resistance leads to unnecessary losses of power.
An additional fuse in the positive cable to the subwoofer is necessary in any case (fuse holder
is not included in delivery). The fuse should be placed as close as possible to the battery (max.
20 cm away). In case of a short circuit (e.g. if the connection cable is worn through), the fuse will
disconnect the positive lead thus avoiding damage to the battery or preventing the supply cable
from burning.
The strength of the fuse depends on the power consumption of the connected devices of the car
hi-fi system.
• Connect the BAT connection on the connecting terminal of the power supply (9) directly to the positive terminal of
the car battery.
• Connect the REM connection on the connecting terminal of the power supply (9) to the remote control connection
of the aerial control output of the car radio.

The subwoofer is switched on through this input, as long as there is a voltage of +12 V present.
Nowadays, almost all car radios are provided with such a control output which only carries +12 V if the
radio is turned on.
• Connect the GND connector on the connection terminal for the power supply (9) to the negative terminal (earth)
of the battery or to the car body.
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