Connection Of The; Power Amplifier; Power Supply; Operating Voltage - Monacor HPB-604 Notice D'utilisation

•
As forces occur during braking, the power
amplifier must tightly be screwed to a
mechanically stable place .
•
The fuses and the controls must be ac-
cessible .
The power amplifier should be installed elec-
trically insulated from the car chassis . Tightly
screw the amplifier with the four fixing brack-
ets at a suitable place .

6 Connection of the

Power Amplifier

•
The connection of the car HiFi power
amplifier to the electric system of the car
must only be carried out by authorized
personnel .
•
To prevent damage in case of a short circuit
during installation, always screw off the
negative terminal from the car battery prior
to connecting the power amplifier .
•
Lay the necessary cables so that their insu-
lation cannot be damaged .
The complete connection is shown in figs . 3
to 6 on page 3 .

6.1 Power supply

6.1.1 Operating voltage

Connect the terminal "+12V" (12) via a high-
power cable to the positive terminal of the car
battery . To keep the voltage loss by the cable
as low as possible, a minimum cross section
of 8 mm should be used, e . g . CPC-100 / RT .
2
To protect the newly laid 12 V cable against
a short circuit, insert an additional 50 A fuse
very close to the battery (max . cable length
to the battery 20 cm) .
To stabilize the operating voltage for the
power amplifier and thus the resulting power
increase and sound improvement, a power
capacitor is recommended .

6.1.2 Ground connection

Connect the ground terminal GND (10) via
a high-power cable with a minimum cross
section of 8 mm (e . g . CPC-100 / SW) to the
2
ground of the car or perferably 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 completely be removed .
2 . To avoid ground loops, the ground of the car radio
must be applied at the place where also the power
amplifier is grounded .

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 (11) . Connect the terminal
REM to the 12 V control output of the car
radio (e . g . connection for a motor antenna,
if necessary, to be connected in parallel to the
motor antenna) .

6.2 Inputs

Connect the two jacks INPUT (2) via cables
with RCA connectors to the corresponding
line outputs at the car radio . If the car radio
8
is not equipped with line outputs, the speaker
outputs of the car radio can be connected
via an transformer (e . g . FGA-22HQ) to the
inputs of the power amplifier . The connection
depends on the desired operating mode of
the power amplifier:

6.2.1 4-channel operation (fig. 3)

Set the switch CHANNEL (8) for the 4-chan-
nel operation to position "4" . Connect the
outputs of the car radio to the jacks INPUT
CH 1 to CH 4 (1 and 2) as follows:
front left to channel 1
front right to channel 2
rear left to channel 3
rear right to channel 4
If the car radio is not equipped with outputs
for the rear channels, connect the output
of the left channel via a Y cable (e . g . CBA-
25 / SW) to the input jacks of the channels 1
and 3 and the output of the right channel
via another Y cable to the input jacks of the
channels 2 and 4 .

6.2.2 Active 2-way operation (fig. 4)

Set the switch CHANNEL (8) for the active
2-way operation to position "2" . Connect the
outputs of the car radio to the jacks INPUT
CH 3 and CH 4 (2):
left channel to channel 3
right channel to channel 4
The channel 1 receives the signal from input 3
and the channel 2 from input 4 .

6.2.3 Bridge operation (fig. 5)

If, in bridge operation, the channels 1 and 2
are to drive the left speaker, and if, in bridge
operation, the channels 3 and 4 are to drive
the right speaker, connect the output of the
left channel at the car radio via a Y cable (e . g .
CBA-25 / SW) to the jacks INPUT CH 1 and
CH 2 (1) and the output of the right channel
via another Y cable to the jacks INPUT CH 3
and CH 4 (2) . For this purpose, set the switch
CHANNEL (8) to position "4" .

6.2.4 3-channel operation (fig. 6)

Set the switch CHANNEL (8) for the 3-chan-
nel operation to position "3" . Connect the
outputs of the car radio to the jacks INPUT (1
and 2) as follows:
left channel to channel 1
right channel to channel 2
subwoofer L to channel 3
subwoofer R to channel 4
If the car radio is not equipped with outputs
for a subwoofer amplifier, connect the inputs
of the channels 3 and 4 to the two jacks OUT-
PUT (9) [see fig . 6] .

6.3 Line output

The mono signal of the inputs 1 to 4 is avail-
able at both jacks OUTPUT (9) . If a subwoofer
amplifier is to be inserted into the car HiFi sys-
tem and if the car radio is not equipped with
outputs for a subwoofer amplifier, the inputs
of the subwoofer amplifier can be connected
to the jacks OUTPUT (also see chapter 6 .2 .4,
if necessary) .

6.4 Speakers

It is possible to use full range speakers (2-way
or 3-way speakers), mid-high range speakers,
bass speakers, or a subwoofer .
Important! All speakers must be connected
with 2 poles, i . e . without common ground
connection . When choos ing suitable speak-
ers, pay attention to their mechanical and
electrical capability in con nection with the
power used of the power amplifier (also see
specifications page 9) .
The highest output power is reached when
connecting 2 Ω speakers or a speaker group
with a total impedance of 2 Ω per channel
(e . g . two 4 Ω speakers connected in parallel) .
However, it is also possible to connect indi-
vidual 4 Ω speakers; in this case, the output
power is slightly reduced .
Attention! The impedance of the speakers
or the total impedance of speaker groups
which are driven in bridge operation must
not fall below 4 Ω!
Connect the speakers to the terminals
SPEAKER (16) . The exact connection of the
speakers depends on the desired operating
mode of the power amplifier:

6.4.1 4-channel operation

Also see fig . 3 .
CH 1 L+ positive pole speaker left front
CH 1 L− negative pole speaker left front
CH 2 R+ positive pole speaker right front
CH 2 R− negative pole speaker right front
CH 3 L+ positive pole speaker left rear
CH 3 L− negative pole speaker left rear
CH 4 L+ positive pole speaker right rear
CH 4 L− negative pole speaker right rear

6.4.2 Active 2-way operation

Also see fig . 4
CH 1 L+ positive pole left bass speaker
CH 1 L− negative pole left bass speaker
CH 2 R+ positive pole right bass speaker
CH 2 R− negative pole right bass speaker
CH 3 L+ positive pole left mid-high range speaker
CH 3 L− negative pole left mid-high range speaker
CH 4 L+ positive pole right mid-high range speaker
CH 4 L− negative pole right mid-high range speaker

6.4.3 Bridge operation

While connecting, pay attention to the letter-
ing "BRIDGE", also see fig . 5 .
CH 1 L+ positive pole left speaker
CH 1 L− remains unconnected
CH 2 R+ remains unconnected
CH 2 R− negative pole left speaker
CH 3 L+ positive pole right speaker
CH 3 L− remains unconnected
CH 4 L+ remains unconnected
CH 4 L− negative pole right speaker
6.4.4 3-channel operation
Also see fig . 6
CH 1 L+ positive pole left speaker
CH 1 L− negative pole left speaker
CH 2 R+ positive pole right speaker
CH 2 R− negative pole right speaker
CH 3 L+ positive pole subwoofer
CH 3 L− remains unconnected
CH 4 L+ remains unconnected
CH 4 L− negative pole subwoofer