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4-Channel Car HiFi
Power Amplifier
These instructions are intended for experts
with knowledge in the electrical system of
cars (all chapters) and users without any spe-
cific knowledge (chapters 3 and 4) . Please
read the instructions carefully prior to instal-
lation and keep them for later reference .
All operating elements and connections
described can be found on the fold-out
page 3 .
1 Applications
The power amplifier HPB-604 has especially
been designed for car HiFi systems and is able
to drive four full range speakers (2-way or
3-way speakers) . Due to the integrated cross-
over networks, it is also possible to implement
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, the
channels 1, 2 and / or 3, 4 can drive one 4 Ω
speaker each in bridge operation .
Contents
1
Applications . . . . . . . . . . . . . 7
2
Operating Elements
and Connections . . . . . . . . . . 7
2 .1 Front panel . . . . . . . . . . . . . . 7
2 .2 Rear panel . . . . . . . . . . . . . . 7
3
Safety Notes . . . . . . . . . . . . . 7
4
Caution with High Volumes . . . . 7
5
Installation . . . . . . . . . . . . . 7
6
Power Amplifier . . . . . . . . . . . 8
6 .1 Power supply . . . . . . . . . . . . . 8
6 .1 .1 Operating voltage . . . . . . . . . 8
6 .1 .2 Ground connection . . . . . . . . . 8
6 .2 Inputs . . . . . . . . . . . . . . . . . 8
6 .2 .1 4-channel operation (fig . 3) . . . . . 8
6 .2 .3 Bridge operation (fig . 5) . . . . . . 8
6 .2 .4 3-channel operation (fig . 6) . . . . . 8
6 .3 Line output . . . . . . . . . . . . . . 8
6 .4 Speakers . . . . . . . . . . . . . . . 8
6 .4 .1 4-channel operation . . . . . . . . 8
6 .4 .2 Active 2-way operation . . . . . . . 8
6 .4 .3 Bridge operation . . . . . . . . . . 8
6 .4 .4 3-channel operation . . . . . . . . 8
7
Setting into Operation . . . . . . . 9
crossover frequencies . . . . . . . . . 9
the bass boosting . . . . . . . . . . . 9
8
Troubleshooting . . . . . . . . . . . 9
9
Specifications . . . . . . . . . . . . 9
2 Operating Elements
and Connections
2.1 Front panel
1 RCA jacks CH 1 and CH 2 for the input
signals of the channels 1 and 2
2 RCA jacks CH 3 and CH 4 for the input
signals of the channels 3 and 4
3 Trimming controls LEVEL for input level
matching:
upper control for the channels 1 and 2,
lower control for the channels 3 and 4
4 Trimming controls BASS EQ for bass boost-
ing up to 12 dB at 50 Hz:
upper control for the channels 1 and 2,
lower control for the channels 3 and 4
5 Trimming controls HP for adjusting the
crossover frequency of the high pass:
upper control for the channels 1 and 2,
lower control for the channels 3 and 4
6 Trimming controls LP for adjusting the
crossover frequency of the low pass:
upper control for the channels 1 and 2,
lower control for the channels 3 and 4
7 CROSSOVER switches for selecting the
filters:
upper switch for the channels 1 and 2,
lower switch for the channels 3 and 4
FULL for full range speakers, no filter
switched on
LP
for bass speakers or a subwoofer,
low pass switched on
HP
for mid-high range speakers, high
pass switched on
8 Switch for the operating mode
"2" for active 2-way operation: only
connect the inputs 3 and 4 (fig . 4),
channel 1 receives the signal from
input 3 and channel 2 from input 4
"3" 3-channel operation: channels 1
and 2 operate separately, channels
3 and 4 are used in bridge operation
to drive a subwoofer (fig . 6)
"4" 4-channel operation: each channel is
driven via an individual input (fig . 3)
9 Line jacks OUTPUT for connection of a
subwoofer amplifier or for connection of
the inputs 3 and 4 (fig . 6)
The fed-through input signal of the inputs
1 to 4 is available in mono at both jacks .
2.2 Rear panel
10 Ground terminal GND
11 Control input REM for switching on the
power amplifier via a 12 V voltage supply
12 Connection for the supply voltage +12 V
13 Fuses 2 × 25 A
Only replace a blown fuse by one of the
same type!
14 POWER LED
15 LED PROT . lights up when the protective
circuit has been activated:
1 . if a short circuit has occurred at one of
the speaker outputs (16)
2 . if the power amplifier is overheated
16 Terminals SPEAKER
3 Safety Notes
The power amplifier corresponds to all rel-
evant directives of the EU and is therefore
marked with
.
•
Be very careful when connecting the car
HiFi power amplifier to the battery . Risk of
short circuit and dangerous high voltage!
Therefore, always screw off the negative
terminal from the car battery prior to con-
necting the power amplifier .
•
The power amplifier must be installed at
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 ob-
jects sensitive to heat near the unit and
do not touch the power amplifier while in
operation .
•
For cleaning only use a dry, soft cloth; never
use chemicals or water .
•
No guarantee claims for the unit and no
liability for any resulting personal damage
or material damage will be accepted if the
unit is used for other purposes than orig-
inally intended, if it is not correctly con-
nected or operated, or if it is not repaired
in an expert way .
If the unit is to be put out of oper-
ation definitively, take it to a local
recycling plant for a disposal which
will not be harmful to the environ-
ment .
4 Caution with High Volumes
•
Never adjust a very high volume . Extremely
high volumes may damage your hearing .
•
Your ear will accustomed to high volumes
which do not seem to be that high after
some time . Therefore, do not increase a
high volume after getting used to it .
•
While driving in the car, signal sounds, e . g .
by an ambulance, must not be drowned by
the car HiFi system which has been set to a
very high volume .
•
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 may
not be able to supply sufficient energy for
starting the car .
5 Installation
When choosing the place of installation,
always observe the following:
•
The 12 V power supply cable from the bat-
tery 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 .
•
The ground cable from the power amplifier
to the chassis of the car should also be as
short as possible .
•
Sufficient air circulation is required to dissi-
pate the heat generated by the car HiFi power
amplifier .
7
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