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All operating elements and connections can
be found on the fold-out page 3.
1 Operating Elements and
Connections
1 RCA jacks INPUT for the input signals
(line level)
2 Trimming control GAIN for matching the input
level
3 SPEAKER terminals
4 High level inputs HIGH INPUT for connection
to speaker outputs, as an alternative to the
RCA input jacks (1)
5 Trimming control X-OVER for adjusting the
crossover frequency (50 – 500 Hz)
6 Switch X-OVER for selecting the filters:
LP
for bass speakers or a subwoofer, low
pass switched on
FULL for full range speakers,
no filter switched on
HP
for mid-high range speakers,
high pass switched on
7 Fuse: 30 A
Only replace a blown fuse by one of the same
type!
8 Power LED
green = correct operation
red =
protective circuit activated
(
chapter 8), e. g. shortly during
switching-on
9 Ground terminal GND
10 Control input REM for switching on the power
amplifier via a 12 V voltage
11 Terminal BATT for the operating voltage
+12 V
2 Safety Notes
The power amplifier corresponds to the directive
for automobiles. The test number is indicated on
the unit.
WARNING When connecting the car HiFi
power amplifier to the car battery,
be especially careful. In case of
short circuits there may be dan-
gerously high currents. Therefore,
prior to the connection, it is indis-
pensable to screw off the negative
terminal of the car battery.
The power amplifier must be mounted to a
mechanically stable place in the car. It must be
skilfully fixed so that it does not get loose and
turn into a dangerous projectile.
During operation the unit may become very hot.
Therefore, do not place any objects sensitive to
heat close to it and do not touch the power
amplifier while in operation.
G
For cleaning only use a dry, soft cloth, never
use chemicals or water.
G
No guarantee claims for the unit and no liabil-
ity for any resulting personal damage or mate-
rial damage will be accepted if the unit is used
for other purposes than originally intended, if it
is not correctly installed or operated, or not
repaired in an expert way.
If the unit is to be put out of operation
definitively, take it to a local recycling
plant for a disposal which is not harmful
to the environment.
3 Caution
in Case of High Volumes
CAUTION
Never adjust the volume very
high. Extremely high volumes may
damage your hearing. The human
ear gets accustomed to high vol-
umes which do not seem to be so
high any more after some time. Therefore, do
not further increase a high volume which has
once been adjusted after getting used to it.
While driving in the car, signal sounds, e. g. by
an ambulance, must not be drowned by the vol-
ume of the car HiFi system which has been
adjusted too high.
With the motor switched off, the car HiFi system
should not be in operation at high volume for a
longer period of time. The car battery will quickly
be discharged, and then it may not be capable
any more of supplying sufficient energy for start-
ing the car.
4 Applications
The compact power amplifier NANO-404 has
especially been designed for car HiFi systems
and is capable of driving four full range speakers
(2-way or 3-way speakers). Due to the integrated
crossover networks, it is also possible to realize
an active 2-way system with two mid-high range
speakers and two bass speakers or a subwoofer
(bi-amping). To obtain a higher output power,
two channels each in bridge operation can drive
one speaker.
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 possible.
G
For carrying off the heat being generated by
the car HiFi power amplifier, sufficient ventila-
tion has to be ensured.
G
As forces occur during braking, the power
amplifier must tightly be screwed to a mechan-
ically 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
carried out by qualified, specialized person-
nel.
G
To prevent damage in case of a possible short
circuit during installation, prior to the connec-
tion it is indispensable to screw off the nega-
tive terminal of the car battery.
G
Lay the necessary cables so that their insula-
tion cannot be damaged.
Various connecting possibilities are shown in
figs. 2 to 5 on page 3.
6.1 Power supply
6.1.1 Ground connection
Connect the ground terminal GND (9) via a cable
with a minimum cross section of 10 mm
CPC-100 / SW from CARPOWER) to the ground
of the car or better directly to the negative termi-
nal 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 (11) via a cable
to the positive terminal of the car battery. To
keep the voltage loss by the cable as low as pos-
sible, 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 circuit, insert an additional
fuse very close to the battery (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 (1) of the power ampli-
fier are connected via RCA cables to the line out-
puts at the car radio (or another signal source).
However, if the car radio is not equipped with
line outputs, as an alternative the speaker out-
puts of the car radio can be connected to the
high level inputs HIGH INPUT (4) of the power
amplifier. Two matching connection cables are
supplied with the power amplifier.
The connection of the inputs depends on the
desired operating mode of the power amplifier:
6.2.1 4-channel operation (fig. 2)
The 4-channel operation is required when using
four full range speakers (2-way or 3-way speak-
ers). Connect the outputs of the car radio to the
inputs of the power amplifier as follows:
front left
to the jack FRONT L
front right
to the jack FRONT R
rear left
to the jack REAR L
rear right
to the jack REAR R
If the car radio is not equipped with outputs for
the rear channels, connect the output of the car
radio of the left channel via a Y cable (e. g. CBA-
25 / SW from CARPOWER) to the two inputs
FRONT L and REAR L of the power amplifier
and the output of the right channel via a second
Y cable to the two inputs FRONT R and REAR R
(e. g. as shown in fig. 3).
6.2.2 Active 2-way operation (fig. 3)
For active 2-way operation with mid-high range
speakers and bass speakers, each speaker is
driven by an individual amplifier channel. The
frequency ranges between the mid-high range
GB
2
(e. g.
7
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