Audio inputs
The preamplifier outputs are connected
to
the cinch
(RCA)
sockets via a shielded audio line
(see
Fig.
3).
Plus I
minus connection
-
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.
Integrated fuses (2 x
20
A)
The fuses integrated in
the
amplifier
protect
the
power
amplifier
and
the
entire electrical system in
case
of
an
error.
If
a replacement fuse
is
used, never bridge fuses
or
replace
them
with
a
type
with
higher current.
Connection examples
Connection
of
the
voltage supply
..................................
Fig.
2
Audio inputs
...........................................................................
Fig.
3
Loudspeaker connections
.................................................
Fig.
4-
8
Remote control connection (optional equipment)
......
Fig.
9
I
~o-
+12V
I
Remote connection
of
the amplifier
with
switchable +
12
V
voltage
source.
This
allows
the
amplifier
to
be switched on and
off
using the
on/off-switch
of
the car sound system.
Loudspeaker connections
(If
the
amplifier
is
to
bejumpered, continue
with
the section
"Bridged loudspeaker connections" at this point).
As
with
every audio component, the correct polarisation
of
amplifier
and loudspeakers
is
of
essentially
importance for a
good
bass
response. Forth
is
reason, ensure
that
the positive
connection
(+)
of
the
amplifier
is
connected
with
the posi-
tive connection
(+)of
the loudspeaker; the same
applies
to
the negative connections
(-).
In
addition, the
left amplifier
channel
must be connected
with
the
left loudspeaker and
the right
amplifier channel
with
the right loudspeaker.
Bridged loudspeaker connections
The
GTA
amplifier
can
also
be bridged for a
mono
configura-
tion. This
allows
the
amplifier
to
be used for one or
several
subwoofers or a mid-range driver.
In
this configuration, the
amplifier
combines the right and left channel
to
a
single-
channel
output
(mono output).
Note:
The amplifier can add the right and left
signal information
only
if
the
right
as
well
as
the
left
cinch
(RCA)
connection
were carried out.
Caution:
In
a
bridge
circuit,
the
amplifier
load must
be
4
n
or
higher. A lower load leads
to
an overheating
or
switch-
off
of
the
amplifier and can cause
permanent
damages.
GTA470DSP
Subwoofer connection
The
GTA
470
DSP
features three different options
of
con-
necting a subwoofer:
-
An
active subwoofer
or
an
additional amplifier
are con-
nected
with
a cinch
(RCA)
cable
to
the
two
SUBWOOFER
OUTPUT
sockets
(see
Fig.
7).
The setting options
of
the
integrated
DSP
(Digital Sound
Processor)
can be used
in this
case.
A
passive subwoofer
is
connected
to
the bridged loud-
speaker
output
(see
the section "Bridged loudspeaker
connections").
To
be able
to
use
the setting options
of
the integrated
DSP
(Digital Sound
Processor),
the
two
REAR
INPUT
sockets must
additionally be connected
with
a
commercially
available cinch
(RCA)
cable
with the
two
SUBWOOFER
OUTPUT
sockets
(see
Fig.
8).
A
passive subwoofer
is
connected
to
the bridged
loud-
speaker
output
(see
the section "Bridged loudspeaker
connections"). The setting options
of
the integrated
DSP
(Digital
Sound Processor)
cannot be used in this
case.
DSP sound settings
(FRONT and
REAR
loudspeakers)
A variety
of
options
is
available
to
optimise the sound
of
the
connected loudspeakers:
-
GAIN
control (FRONT and
REAR)
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
GTA
470
DSP
features separate controls
for the
FRONT
and
REAR
loud-
speakers.
In
each
case,
the adjustment range
is
from
0.2
V
to
5
V.
If
a car sound system
of
a third party manufacturer
is
connected, the
input
sensitivity must be adjusted cor-
responding
to
the manufacturer data.
A few
important
explanations in this context:
By
turning the
GAIN
control clockwise,
the input sensitivity
of
the
amplifier and, therefore, also
the
volume
increases.
However, this
is
not
a volume control.
In
the end position,
it
is
not
possible
to
achieve a higher
amplifier
output, even
if
it
sounds like
that
at first. The system
merely
increases
the
volume faster
if
the
volume
control
of
the car sound
system
is
turned up.
FULL/HI/LOW
switch and X-OVER control
(FRONT and
REAR)
For
the
GTA
470
DSP,
the type
of
frequency crossover
("Low-Pass"
or
"High-Pass") and the desired
cut-off
fre-
quency can be adjusted separately for the
FRONT
and
REAR
loudspeakers.
Select
the
cut-off
frequency
up
to
which lowerfrequencies (high-pass) or higher frequencies
(low-pass)
should be
blocked. Only
frequencies above
the
cut-off
frequency (high-pass) or
below
the
cut-off
frequency (low-pass) are passed on
to
the loudspeakers.
The cut-off frequency
is
dependent upon the frequency
range
of
the loudspeakers
(see
recommended frequency
range
of
the loudspeakers).
"High-Pass" (switch setting:
HI)
With a setting
of80
Hz,
the
amplifier
has
a frequency range
from 80
Hz
to
30,000
Hz.
"Low-Pass"
(switch setting:
LOW)
This control
is
active
if
the switch
is
in the
LOW
position,
and
allows
for setting the desired entry frequency.
7
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