Technical data

Xlb
250
A
•
Xlb
300
A
Connection
(see page
42}
Power-on indicator (Power/Protect}
2
,;
Connection for cable remote control
Phase
position
4
Automatic switch-on
Left loudspeaker
input
Right loudspeaker
input
Preamplifier inputs
r
B ,
20
A fuse
( g:,
+
Battery
--
{
10
,1
Remote connection
-Earth
~
:
~?
'
Bass
boost
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
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.
4o
1
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.
Switching on/off
A special feature
of
the
Xlb
is
its automatic switch-on.
It
is
set via the
AUTO
TURN
ON
switch
(
~
~
·
:
:
-
REM
Switching
on/off
via
the car sound system. The remote
connection
of
the
XLb
must
be connected
with
a
switchable 12-V power supply
(e.g.
switching
output
of
the
car sound system).
-
DC
OFFSET
~-
~~i~
-
~
.
~ing
on/off
via
the
loudspeaker
connections
:
~
)
/:.~
_
)
.
-
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
10
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 faster
if
the volume control
of
the
car sound system
is
turned
up
.