Setting Into Operation; Selecting The Filters And Adjusting The Crossover Frequencies; Adjusting The Level And The Bass Boosting; Troubleshooting - Monacor HPB-604 Notice D'utilisation

7 Setting into Operation

Important! Prior to the first switching-on,
select the filters with the switch CROSS-
OVER (7) and coarsely adjust the crossover
frequency (chapter 7 .1) so that the speak-
ers will not be overloaded by a frequency
range that might be too wide . It is also rec-
ommended to check first once again if the
entire wiring of the car HiFi power amplifier
is correct, and only then to connect the neg-
ative terminal of the car battery .
7.1 Selecting the filters and adjusting
the crossover frequencies
Depending on the speaker types connected,
select the filters with the switches CROSS-
OVER (7) . The upper switch and the upper
controls are intended to adjust the channels
1 and 2, the lower switch and the lower con-
trols are intended for the channels 3 and 4 .
For full range speakers, set the switch to the
left stop to position FULL . The power amplifier
reproduces the entire frequency range .
For bass speakers or a subwoofer, set the
switch to position LP . The low pass is switched
on and the medium and high frequencies
are suppressed . For the time being, coarsely
adjust the crossover frequency with the con-
trol LP (6) .*
For mid-high range speakers, set the switch
to position HP . The high pass is switched on
and the low frequencies are thus suppressed .
For the time being, coarsely adjust the cross-
over frequency with the control HP (5) .*
* For a guidance, observe the frequency range of the
speakers used . The fine adjustment is made with
corresponding meters after the level adjustment .
7.2 Adjusting the level and
the bass boosting
Hint To keep the interference by the electric
system of the car as low as possible, the
output level of the signal source should be
1 .5 V as a minimum .
1) Turn both controls LEVEL (3) to the left stop
to position MIN .
2) Switch on the car HiFi system completely .
The green POWER LED (14) lights up . How-
ever, the power amplifier is muted for ap-
prox . 3 seconds (switch-on delay) .
3) Adjust the signal source, e . g . the car radio,
to the maximum, non-distorting volume .
4) Turn up the controls LEVEL to the non-dis-
torting maximum . (The upper controls are
intended to adjust the channels 1 and 2
and the lower controls are intended for
the channels 3 and 4 .)
In 4-channel operation, it is also possi-
ble to adjust the balance between the front
and rear speakers if the car radio is not
equipped with a corresponding control .
In active 2-way operation, and 3-chan-
nel operation adjust a natural sound with
the controls: if the volume of the low fre-
quencies is too low, reduce the levels of the
channels for the mid-high range speakers .
If the volume of the bass frequencies is too
high, reduce the volume of the bass chan-
nels or of the subwoofer channel .
5) If required, the bass frequencies can be
boosted with the corresponding control
BASS EQ (4) [max . 12 dB / 50 Hz] .
6) If further power amplifiers are used in the
car HiFi system, reduce the levels of the
channels which are too high to match the
volumes of all channels with each other .

8 Troubleshooting

If there is no sound after switching on the car
HiFi system, locate the fault more precisely
by means of the two LEDs POWER (14) and
PROT . (15) .
The LED POWER does not light up
1) Check the fuses (13) of the car HiFi ampli-
fier (2 × 25 A) and the additional fuse (50 A)
at the car battery . Replace defective fuses .
Only use fuses with the indicated values .
Never insert a fuse of a higher value . The
power amplifier may be damaged and the
warranty will be void .
2) Check the 12 V power supply cable and
the ground cable for correct connection
and for interruptions .
3) Check at the terminal REM (11) of the
power amplifier if +12 V is available . If
not, remove the cable at the terminal REM
and temporarily bridge the terminals REM
and "+12V" (12) . If the power amplifier
switches on now, the fault is due to the
missing control voltage . Check the 12 V
control output of the car radio and the
corresponding connection cable to the
power amplifier .
The LED POWER lights up
1) Is the switch CHANNEL (8) in the correct
position? See chapters 6 .2 .1 to 6 .2 .4 .
2) Check the cables with RCA connectors
from the signal source to the car HiFi
power amplifier . Are the plugs correctly
connected? Are the cables interrupted?
3) Check the signal source . Is the signal source
switched on? Have the correct outputs
been used? Is the signal source defective?
4) Check the speaker cables for interruptions .
5) Check the connected speakers .
LED PROT. lights up
The power amplifier is protected with a
protective circuit against short circuit at the
speaker outputs and against overheating .
If the protective circuit is activated, the LED
PROT . (15) lights up . In case of overheating,
the power amplifier automatically switches on
again after cooling down . In case of a short
circuit at the speaker outputs, after eliminat-
ing the error, the 12 V control voltage must
shortly be switched off (e . g . switch off the car
radio) to reset the protective circuit .
All rights reserved by MONACOR
be reproduced in any form or by any means for any commercial use.

9 Specifications

Output power
Total power (P
4-channel operation at 2 Ω: �4 × 100 W RMS
4-channel operation at 4 Ω: �4 × 75 W RMS
Bridge operation at 4 Ω: � � �2 × 200 W RMS
Frequency range: � � � � � � � � � �20 – 20 000 Hz
Min� speaker impedance
4-channel operation: � � � � � �2 Ω
Bridge operation: � � � � � � � �4 Ω
Inputs: � � � � � � � � � � � � � � � � �4 × RCA
Sensitivity: � � � � � � � � � � � � �0�4 – 4 V
Impedance: � � � � � � � � � � � � �20 kΩ
Channel separation: � � � � � � � �> 45 dB
S / N ratio: � � � � � � � � � � � � � � �> 93 dB (weighted)
THD: � � � � � � � � � � � � � � � � � � � < 0�2 %
Low passes: � � � � � � � � � � � � � �40 – 300 Hz,
High passes: � � � � � � � � � � � � �40 – 500 Hz,
Bass boosting: � � � � � � � � � � � �0 – 12 dB / 50 Hz
Power supply: � � � � � � � � � � � �10 – 16 V (⎓) / 50 A
Ambient temperature: � � � � � �0 – 40 °C
Dimensions (W × H × D): � � � �252 × 62 × 400 mm
Weight: � � � � � � � � � � � � � � � � �3�2 kg
Subject to technical modification .
® INTERNATIONAL GmbH & Co. KG. No part of this instruction manual may
): � � � � � � �700 W
max
6 dB / octave
6 dB / octave
9