speakers and the bass speakers are limited by the
integrated crossover networks (
chapter 7.1).
Connect the outputs of the car radio to the fol-
lowing inputs of the power amplifier:
Connect the output 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 chan-
nel via a second Y cable to the two inputs
FRONT R and REAR R.
6.2.3 Bridge operation
(fig. 4)
To increase the output power, the channels
FRONT L and FRONT R in bridge operation may
drive the left speaker and the channels REAR L
and REAR R in bridge operation the right
speaker. 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 FRONT R of the power amplifier and the
output of the right channel via a second Y cable
to the two inputs REAR L and REAR R.
6.2.4 3-channel operation
(fig. 5)
The 3-channel operation serves to support two
full range speakers by a subwoofer. To obtain a
higher power for the subwoofer, the channels
REAR L and REAR R are used in bridge circuit.
Connect the outputs of the car radio to the inputs
of the power amplifier as follows:
left channel
to channel FRONT L
right channel to channel FRONT R
subwoofer L to channel REAR L
subwoofer R to channel REAR R
If the car radio is not equipped with outputs for a
subwoofer amplifier, connect the output 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 (see fig. 5).
6.3
Speakers
It is possible to use full range speakers (2-way
or 3-way speakers), mid-high range speakers,
bass speakers, or subwoofers.
The highest output power is reached when con-
necting 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 individual 4 Ω speakers
in which case the output power is slightly re
-
duced.
Connect the speakers to the
jack SPEAKER (3) via the
supplied connection cable.
The connection depends on
the desired operating mode
of the power amplifier:
6.3.1 4-channel operation
Also see fig. 2.
SPEAKER F
L
⊕
= positive pole speaker left front
SPEAKER F
L
⊖
= negative pole speaker left front
SPEAKER F
R
⊕
= positive pole speaker right front
SPEAKER F
R
⊖
= negative pole speaker right front
SPEAKER R
L
⊕
= positive pole speaker left rear
SPEAKER R
L
⊖
= negative pole speaker left rear
SPEAKER R
R
⊕
= positive pole speaker right rear
SPEAKER R
R
⊖
= negative pole speaker right rear
6.3.2 Active 2-way operation
Also see fig. 3
SPEAKER F
L
⊕
= positive pole left mid-high range
speaker
SPEAKER F
L
⊖
= negative pole left mid-high range
speaker
SPEAKER F
R
⊕
= positive pole right mid-high range
speaker
SPEAKER F
R
⊖
= negative pole right mid-high range
speaker
SPEAKER R
L
⊕
= positive pole left bass speaker
SPEAKER R
L
⊖
= negative pole left bass speaker
SPEAKER R
R
⊕
= positive pole right bass speaker
SPEAKER R
R
⊖
= negative pole right bass speaker
6.3.3 Bridge operation
While connecting, pay attention to the lettering
BRIDGED, also see fig. 4.
SPEAKER F
L
⊕
= positive pole left speaker
SPEAKER F
L
⊖
= remains unconnected
SPEAKER F
R
⊕
= remains unconnected
SPEAKER F
R
⊖
= negative pole left speaker
SPEAKER R
L
⊕
= positive pole right speaker
SPEAKER R
L
⊖
= remains unconnected
SPEAKER R
R
⊕
= remains unconnected
SPEAKER R
R
⊖
= negative pole right speaker
6.3.4 3-channel operation
Also see fig. 5
SPEAKER F
L
⊕
= positive pole left speaker
SPEAKER F
L
⊖
= negative pole left speaker
SPEAKER F
R
⊕
= positive pole right speaker
SPEAKER F
R
⊖
= negative pole right speaker
SPEAKER R
L
⊕
= positive pole subwoofer
SPEAKER R
L
⊖
= remains unconnected
SPEAKER R
R
⊕
= remains unconnected
SPEAKER R
R
⊖
= negative pole subwoofer
7 Setting into Operation
7.1
Selecting the filters and adjusting
the crossover frequencies
Depending on the speaker type connected, select
the filters with the switches X-OVER (6). The left
switch and the left controls are intended to adjust
the channels FRONT L and FRONT R, the right
switch and the right controls to adjust the chan-
nels REAR L and REAR R.
For
full range speakers
set the switch / switches
X-OVER to the position FULL. The correspond -
ing channels reproduce the entire frequency
range. The corresponding controls X-OVER have
no function.
For
mid-high range speakers
set the switch /
switches X-OVER to the position HPF. The high
pass is switched on in the corresponding chan-
nels and the low frequencies are thus sup-
pressed. For the time being, coarsely adjust the
crossover frequency with the corresponding
control X-OVER.*
For
bass speakers
or
subwoofers
set the
switch / switches X-OVER to position LPF. The
low pass is switched on in the corresponding
channels and the medium and high frequencies
are suppressed. For the time being, coarsely
adjust the crossover frequency with the corre-
sponding control X-OVER.*
7.2
Adjusting the level
1) First for basic adjustment, turn the two con-
trols GAIN (2) to the left stop to position MIN.
2) Switch on the car HiFi system completely.
The power LED (7) shortly shows red, then
green. If it does not light up or only shows red,
see chapter 8.
3) Adjust the signal source, e. g. the car radio, to
the maximum, non-distorting volume.
4) Turn up the controls GAIN so far to the maxi-
mum that no distortions occur. (The left control
is intended to adjust the channels FRONT L
and FRONT R, the right control for the chan-
nels REAR L and REAR R.)
For 4-channel operation the controls also
allow to adjust the balance between the front
and rear speakers if the car radio is not
equipped with such a control.
For active 2-way operation and for 3-chan-
nel operation adjust a natural sound with the
controls: if the volume of the bass frequen-
cies is too low, attenuate the levels of the
channels for the mid-high range speakers. If
the volume of the bass frequencies is too
high, attenuate the volume of the bass chan-
nels or subwoofer channel.
5) If further power amplifiers are used in the car
HiFi system, attenuate in each case the lev-
els of the channels which are too high to
match the volumes of all channels with each
other.
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.
Important!
Prior to the first switching-on, select the filters
with the switches X-OVER (6) and coarsely
adjust the crossover frequencies with the con-
trols X-OVER (5) [chapter 7.1] so that the
speakers will not be overloaded by a frequency
range that might be too wide. It is also recom-
mended to check the entire wiring of the power
amplifier once again for correctness before
reconnecting the negative terminal of the car
battery.
Attention!
For bridge operation (chapters 6.3.3 and 6.3.4)
the impedance of the speakers or the total
impedance of speaker groups must not fall
below 4 Ω!
Important!
All speakers must be connected with 2 poles,
i. e. without common ground connection.
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 (
specifications, page 9).
* For a guidance, observe the frequency range of the
speakers used. The fine adjustment is made with cor-
responding meters after the level adjustment.
8
GB
