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output of the car radio (connection for a motor
antenna, if necessary, to be connected in parallel
to the motor antenna).
6.2 Line inputs and outputs
1) Connect the two input jacks LINE INPUT (1)
via RCA cables to the line outputs at the car
radio (or another signal source) or, if provided,
to the outputs for a subwoofer amplifier.
If the car radio is not equipped with line outputs, the speaker outputs of the car radio may
be connected via a corresponding audio transformer (e. g. FGA-22HQ from CARPOWER) to
the inputs of the power amplifier.
2) The line input of the power amplifier for the
main speakers may be connected via an RCA
cable to the jacks LINE OUTPUT (2). The input
signal of the jacks LINE INPUT (1) is present at
these jacks.
6.3 Speakers
Connect the subwoofer (minimum impedance
1 Ω) or a subwoofer group with a total impedance
of 1 Ω as a minimum to the terminal SPEAKER
OUTPUT (18). The two terminal pairs “+” and “-“
are connected in parallel so that it is also possible
to connect two subwoofers with an impedance of
2 Ω each, if required.
Important! When choosing suitable speakers,
pay in any case attention to their mechanical and
electrical capability in connection with the power
used of the power amplifier ( chapter 9, Specifications).
6.4 Remote control
The remote control (14) allows to readjust the volume of the subwoofer as desired. Mount the
remote control within the driverʼs reach and connect it to the jack REMOTE (6) of the power amplifier.
6.5 Master slave mode
Two D-REX / 2000 units may be interconnected so
that a subwoofer (minimum impedance 2 Ω) may
be operated in bridge mode at double power
(fig. 3). However, this amplifier combination may
also drive two 1 Ω subwoofers*.
1) Connect the jack MASTER OUTPUT (12) of
the master unit (main unit to which e. g. the
radio is connected) to the jack SLAVE INPUT
(11) of the slave unit via an RCA cable.
2) Set the switch MODE (9) of the master unit to
position MASTER OUTPUT and the switch
MODE of the slave unit to position SLAVE
INPUT.
3) For connecting a subwoofer (minimum impedance 2 Ω) in bridge mode:
a) Connect one of the negative poles of the
speaker terminals SPEAKER OUTPUT
(18) of the master unit to one of the negative poles of the speaker terminals of the
slave unit.
b) Connect the positive pole of the subwoofer
to one of the positive poles of the speaker
terminals of the master unit and the negative pole to one of the positive poles of the
speaker terminals of the slave unit.
4) For connecting two separate subwoofers*
(minimum impedance 1 Ω):
a) Correctly connect the poles of the subwoofer to the master unit: The positive pole
to one of the contacts + of the terminal
SPEAKER OUTPUT (18) and the negative
pole to one of the contacts -.
b) Reversely connect the poles of the second
subwoofer to the slave unit: The positive
pole to one of the contacts - of the terminal
SPEAKER OUTPUT and the negative pole
to one of the contacts +.
5) Except for the switch MODE, all adjustments
are made at the master unit only (chapter 7).
As the master unit is connected to the slave
unit via the RCA cable, the slave unit receives
the audio signal adjusted at the master unit.
7 Setting into Operation
8 Trouble Shooting
If there is no sound after switching on the car hi-fi
system, locate the fault more precisely by means
of the LED PWR / PROT (10).
The LED does not light up
1) Check the fuse of the power amplifier at the car
battery, replace it, if required.
2) Check the 12 V power supply cable and the
ground cable for correct connection and for
interruption.
3) Check at the terminal REM (16) of the power
amplifier if +12 V is present. If not, remove the
cable at the terminal REM and for a short time
short-circuit the terminals REM and +12 V (15).
If the power amplifier is switched 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.
Important! Prior to the first switching-on, it is recommended to check the entire wiring of the car
hi-fi power amplifier once again for correctness
before connecting the negative terminal of the
car battery again.
The LED shows green
1) Check the audio cables from the signal source
to the car hi-fi power amplifier. Are the plugs
correctly connected? Are the cables interrupted?
1) Set the switch MODE (9) to position MASTER
OUTPUT. Only when the power amplifier is
connected as a slave unit in the master slave
mode, set the switch to position INPUT SLAVE
(fig. 3).
2) Check the signal source. Is the signal source
switched on? Have the correct outputs been
used? Is the signal source defective?
2) Adjust the cut-off frequency (i. e. the frequency
at which the radiating range of the subwoofer
is to end) with the control LOW PASS (8).The
fine adjustment is made after the level adjustment with corresponding meters.
3) With the control SUBSONIC (7) adjust the
lower radiating frequency of the subwoofer.
Thus, the subwoofer is protected by the subsonic filter against very low frequencies.
4) Turn the control GAIN (3) to the left stop to
position “6 V” and the control at the remote
control (14) to mid-position.
5) Switch on the car hi-fi system completely. The
LED PWR / PROT (10) shows green and the
LED POWER of the remote control lights up.
However, the power amplifier is still muted for
a few seconds (switch-on delay).
6) Adjust the signal source, e. g. the car radio, to
maximum, non-distorting volume.
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.
7) With the control GAIN (3) adapt the volume of
the subwoofer to that of the main speakers.
Turn up the control so far as a maximum that
no distortions occur.
8) If required, boost the low bass frequencies with
the control BASS EQ (5) [0 – 18 dB at 45 Hz).
9) With the control PHASE (4) adjust the phase to
the main speakers. Especially if kick bass
speakers are additionally installed, an inverse
phase has a negative sound effect (bass frequencies too low). Adjust the control PHASE to
optimum bass reproduction.
10) With the control of the remote control the volume of the subwoofer can be readjusted as
desired.
3) Check the speaker cables for interruption.
4) Check the connected speakers.
The LED shows red
The power amplifier is protected with a protective
circuit against overheating and against short circuit at the speaker output. The protective circuit
additionally responds if a DC voltage arrives at the
speaker output in case of a defect of the power
amplifier. If the protective circuit is activated, the
LED PWR / PROT shows red, the red LED PROTECT at the remote control lights up and the
speaker outputs are switched off. In this case
switch off the car hi-fi system and eliminate the
error.
9 Specifications
Output power
Music power:
Power at 1 Ω:
Power at 2 Ω:
Power at 4 Ω:
.........
.........
.........
.........
2600 WMAX
2200 WRMS
1500 WRMS
875 WRMS
Frequency range: . . . . . . . . 15 – 250 Hz
Min. speaker impedance . . 1 Ω
Input: . . . . . . . . . . . . . . . . . 2 × RCA
Sensitivity: . . . . . . . . . . . 0.2 – 6 V
Low pass: . . . . . . . . . . . . . . 35 – 250 Hz,
24 dB / octave
Subsonic filter: . . . . . . . . . . 15-35 Hz,
24 dB / octave
Bass boosting: . . . . . . . . . . 0 – 18 dB / 45 Hz,
S / N ratio: . . . . . . . . . . . . . . > 95 dB
THD: . . . . . . . . . . . . . . . . . . < 0.1 %
Power supply: . . . . . . . . . . . 11 – 16 V / 200 A
Ambient temperature: . . . . . 0 – 40 °C
Dimensions: . . . . . . . . . . . . 223 × 51 × 544 mm
Weight: . . . . . . . . . . . . . . . . 7.1 kg
Subject to technical modification.
* Instead of two subwoofers it is also possible to connect
one subwoofer with a dual voice coil (minimum impedance per coil 1 Ω).
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GmbH & Co. KG. No part of this instruction manual may
be reproduced in any form or by any means for any
commercial use.
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