Alpine 3558 - Direct;Variable Input Selector Switches; Input Gain Adjustment Controls

c).
Set
to.the
“VARIABLE”
and
“BRIDGED
(L)"
positions
when
the
amplifier
is
used
for
left
channel
of
bridged
system.
'
|
TEREO
DIRECT
VARIABLE
BRIDGED
—_—_—
BRIDGED
(R)
(L)
DIRECT/VARIABLE
Input
Selector
Switches
@®
and
@
a)
Set
to
the
“DIRECT”
position
when
connecting
the
3558
to
other
Alpine
products.
This
position
sets
the
input
sensitivity
to
500mV
which
corresponds
to
the
preamp
output
of
Alpine
products
when
the
amplifier
is
used
as
a
stereo
system.
Set
to
the
"\JARIABLE"
position
if
the
amplifier
is
used
for
bridged
system.
DIRECT
|
VARIABLE
b)
Set
to
the
“VARIABLE”
position
when
connecting
the
3558
to
a
non-Alpine
product
with
an
output
voltage
other
than
500mV.
This
position
should
also
be
used
when
.
adjustment
of
input
sensitivity
is
required
to
obtain
certain
imaging
requirements
or
to
compensate
for
different
speaker
efficiencies.
ee,
DIRECT
VARIABLE
Input
Gain
Adjustment
Controls
After
setting
your
head
unit's
volume
contro}
1/4
of
a
turn
down
from
the
maximum
output
level;
rotate
the
Input
Gain
Adjustment
Controls
®
and
@
with
a
#0
flat
blade
screwdriver
and
adjust
the
input
gain
to
the
point
where
there
is
maximum
volume
with
no
distortion.
Status
Monitor
This
indicator
lights
green
when
the
power
is
on.
The
3558
has
built-in
protection
circuitry.
lf,
for
some
reason,
this
protection
circuit
is
activated,
the
indicator
turns
orange.
lf
this
happens,
turn
the
system
off,
find
the
cause
of
the
problem
and
remedy
the
situation.
This
includes
checking
all
your
connections
and
wiring.
If
the
indicator
remains
orange
when
the
system
ig
turned
on,
consult
your
authorized
Alpine
dealer.
NOTE:
The
indicator
will
illuminate
in
orange
for
a
few
seconds
when
the
power
is
turned
on
as
the
protection
circuit
will
be
activated.
This
is
normal.
13