Technical data

Connection (see page 42)
Power-on indicator (Power/Protect)
1
2 ;
Connection for cable remote control
Phase
position
\·4
':
,
Automatic switch-on
t'_
s)
Left loudspeaker
input
Right loudspeaker
input
Preamplifier
inputs
(a)
20
A
fuse
·:
g :,
+ Battery
·:
1o
··,
Remote connection
-
--
··
'
-Earth
\1-2
':
,
Bass
boost
-.
___
./
(1__
~
)
Upper cut-off frequency
Input
sensitivity
Voltage supply
-
We
recommend a
minimum
cross
section
of
6
mm
2
•
- Route commercially available
plus
cables
to
the battery
and connect via fuse holder.
-
Use
cable glands for holes
with
sharp edges.
- Securely fasten
commercially
available minus cables
to
a
noise-free earth
point
(chassis
screw,
chassis
metal)
(not
to
the
minus pole
of
the
battery).
- Scrap
the
contact surfaces
of
the earth
point
until they
are
bright
and grease with graphite grease.
Connection
~:::
9
~
)
is
connected
to
the
positive pole
of
the
battery and connection
to
negative vehicle ground. The
control
of
the
Xlb
should
ideally
be
a two-channel control,
either via the preamplifier
outputs or the loudspeaker
out-
puts
of
the
car sound system.
A
control
solely
via the right
or
left channel
is
also
possible since
the
low-frequency portion
of
the music
is
generally
identical on both channels.
Integrated
fuse
The
fuse integrated
in
the amplifier protects the output stage
and the entire
electrical
system in
case
of
a malfunction.
If
a
replacement fuse
is
used, never bridge
fuses
or replace them
with a type
with
higher current.
Audio inputs
You
can select between 2 different audio inputs;
- Cinch
(RCA)
-
Hi
level (loudspeaker connections)
Use
only
one
of
the audio inputs; otherwise,
it
may lead
to
audio interferences.
The
preamplifier outputs
are
connected
to
the cinch
(RCA)
sockets
of
the subwoofer box
via
a shielded sound cable.
With
control
via the loudspeaker outputs, the input
connec-
tions
of
pos.
(~
)
(~
~
·::
are
fed
to
the closest loudspeaker cables
(front or rear) on the
left
and right. They
are
separated and
connected
to
the
input
connections. The polarity
of
the
+or-
connections must
be
observed. Bridge
output
stages
(BTL)
can
also
be connected
directly
without
an
additional
adapter.
XLb
250
A
•
XLb
300
A
Switching on/off
A special feature
of
the
Xlb
is
its automatic switch-on.
It
is
set via
the
AUTO
TURN
ON
switch
4
-
REM
Switching
on/off
via
the
car
sound system. The remote
connection
t1o
)
of
the
Xlb
must be connected
with
a
switchable
12-V
power supply
(e.g.
switching
output
of
the car sound system).
-
DC
OFFSET?(·
Switching
on/off
via
the
loudspeaker
connections
( 5 )
/6
.)
.
- AUDIO*
Switching
on/off
via cinch connectors
(RCA}
*The
subwoofer box automatically switches on
if
a music
signal
is
received.lf no music signal
is
received for more than
60
seconds, the
Xlb
automatically switches off.
GAIN control
The
GAIN
control
:
~
:
is
used to adjust
the
input
sensitivity
of
the
power amplifier
to
the
output
voltage
of
your car sound
system preamplifier output.
The adjustment range
is
from
0.2
V
to
1
0
V.
If
a car sound system
of
a third party manufacturer
is
con-
nected, the input sensitivity must
be
adjusted corresponding
to
the
manufacturer data.
The
GAIN
control
can
also
be
operated via the enclosed cable
remote control.
For
this purpose, the remote control must
be
connected
to
the
REMOTE
socket
of
the X
lb.
As
long
as
the remote control
is
connected, changes made
with
the
GAIN
control
of
the subwoofer box have no effect.
A
few
important
explanations in this context:
By
turning the control clockwise, the
input
sensitivity
of
the
amplifier and, therefore,
also
the
volume
increases. However,
this
is
not
a volume control; no
further
amplifier
output
can
be achieved in
the
end position, even
if it
may sound
like
that
at the beginning. The system merely increases the
volume (aster
if
the volume control
of
the
car
sound system
is
turned up.
Bass
boost
The
BASS
BOOST
control
sponse
of
the amplifier.
is
used
to
adjust the
bass
re-
The
adjustment range
is
from
0
dB
to+
12
dB.
X-OVER
frequency
control
The
X-OVER
control
frequency.
Example:
allows
setting
the
desired
entry
At a setting
of
150
Hz,
the amplifier
has
a frequency range
of
25 Hz
to
150 Hz.
Settings
The
following
control setting
is
recommended
as
basic
setting before
putting
the device into operation: Sensitiv-
ity
(GAIN)
Pos.
~·
1!
':1
to
minimum,
PHASE
Pos.
;:·
_~
)
to
0°,
filter
(X-OVER)
Pos.
:.'
i~
)
to
approx.
80
Hz.
Switch on
the
device and
select a musical piece with distinctive
bass
playback.
5