4
Applications
This compact 300 W power amplifier has especially
been designed for car HiFi systems. It allows to
drive a 2 Ω speaker (or two 4 Ω speakers con-
nected in parallel). Due to the integrated crossover
network, it is possible to drive full range speakers
(2-way or 3-way speakers), mid-high range speak-
ers, bass speakers or subwoofers.
5
Mounting
When choosing the place of mounting, always
observe the following items in any case:
G
The 12 V power supply cable from the battery to
the car HiFi power amplifier should be as short
as possible. It is better to use longer speaker
cables and a shorter power supply cable instead.
G
The ground cable from the power amplifier to the
chassis of the car should also be as short as pos-
sible.
G
For carrying off the heat being generated by the
car HiFi power amplifier, sufficient ventilation has
to be ensured.
G
As forces occur during braking, the power ampli-
fier must tightly be screwed to a mechanically
stable place.
Tightly screw the power amplifier at a suitable place
via the four drill holes at the heat sink.
6
Connection
of the Power Amplifier
G
The connection of the car HiFi power amplifier to
the electric system of the car must only be car-
ried out by qualified, specialized personnel.
G
To prevent damage in case of a possible short
circuit during installation, prior to the connection
it is indispensable to screw off the negative ter-
minal of the car battery.
G
Lay the necessary cables so that their insulation
cannot be damaged.
The complete connection is shown in fig. 3 on
page 3.
6.1 Power supply
6.1.1 Ground connection
Connect the ground terminal GND (11) via a cable
with a minimum cross section of 10 mm
2
(e. g.
CPC-100 / SW from CARPOWER) to the ground of
the car or better directly to the negative terminal of
the car battery.
Notes
1. When using the chassis as a ground connection, the
place used must have a good electrical contact to the
main chassis (e. g. by a sufficient number of welding
points). Any lacquer at the point of contact must com-
pletely be removed.
2. To prevent ground loops, the ground of the car radio
must be applied at the place where also the power
amplifier is grounded.
6.1.2 Operating voltage
Connect the terminal BATT (9) via a cable to the
positive terminal of the car battery. To keep the volt-
age loss by the cable as low as possible, a cable
with a minimum cross section of 10 mm
2
should
be used (e. g. CPC-100 / RT from CARPOWER). To
protect the newly laid 12 V cable against a short cir-
cuit, insert an additional fuse very close to the bat-
tery (max. cable length to the battery 20 cm). Select
the fuse value according to the power consumption
of all units connected to the 12 V cable.
6.1.3 Control voltage for switching-on
The car HiFi power amplifier is switched on and off
by a control voltage of +12 V at the terminal REM
(10). Connect the terminal REM to the 12 V control
output of the car radio (connection for a motor
antenna, if necessary, to be connected in parallel to
the motor antenna).
6.2 Inputs
The signal inputs INPUT (6) of the power amplifier
are connected via RCA cables to the line outputs at
the car radio (or another signal source).
However, if the car radio is not equipped with
line outputs, as an alternative the speaker outputs
of the car radio can be connected to the high level
inputs HIGH INPUT (4) of the power amplifier. A
matching connection cable is supplied with the
power amplifier.
For driving a subwoofer with the power amplifier
if the car radio is provided with outputs for a sub-
woofer amplifier, connect these outputs to the two
input jacks INPUT.
6.3 Speakers
Connect the speaker (minimum impedance 2 Ω) or
a speaker group with a total minimum impedance
of 2 Ω to the jack SPEAKER (5) via the supplied
connection cable. The two contact pairs “+” and “-”
are connected in parallel so that also two speakers
with an impedance of 4 Ω each may be connected,
if required.
9
GB
