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Alpine 3552S - Switch Settings; Input Mode and Sensitivity; Crossover and Gain Adjustment; Status Monitor Indicator

Alpine 3552S
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Switch
Settings
Input
Mode
Selector
Switches
@
and
©:
a)
Set
to
the
"ST”
position
(center)
when
the
amplifier
is
used
as
a
4-channel
stereo
system.
La]
L(MONO)
ST
L+R
b)
Set
to
the
"L
(MONO)”
pasition
when
the
amplifier
is
used
for
one
channe|
of
a
stereo
or
bridged
system.
u
|
J
L{MONO)
ST
LR
c)
Set
to
the
"L+R"
position
when
the
amplifier
is
used
for
the
subwoofer
system
which
uses
the
right
channet
and
left
channel
signals
summed,
r—
|
L«MONO)
ST
L+R
Active
Dividing
Network
Selector
Switches
®
and
®
a)
Set
to
the
"LP”
position
when
the
amplifier
is
used
for
the
low-pass
(sub-woofer)
system.
The
frequencies
higher
than
80
Hz
will
be
cut
(at
a
rate
of
18
dB
per
octave).
ju,
OFF
HP
LP
b)
Set
to
the
"HP"
position
when
the
3552
is
used
for
the
high-pass
(iweeter/midrange
and
subwoofer)
system.
The
frequencies
lower
than
80
Hz
will
be
cut
(at
a
rate
of
18
dB
per
octave).
Hilo.
OFF
HP
EP
|
3552
c)
Set
to
the
"OFF"
position
when
the
3552
is
used
for
the
regular
stereo
system
with
full-range
speakers.
The
full
bandwidth
wil!
be
output
without
cutting
the
high
or
low
frequencies.
[
Cy
OFF
HP
LP
Fixed/Variable
Input
Selector
Switches
@
and
©:
a)
Set
to
the
"FIXED"
position
when
connecting
the
3552
to
other
Alpine
products.
This
position
sets
the
input
sensitivity
to
500
mV
which
corresponds
to
the
pre-amp
output
of
Alpine
products.
—
VARIABLE
FIXED
b)
Set
to
the
“VARIABLE”
position
when
connecting
the
3552
to
a
non-Alpine
product
with
an
output
voltage
oiher
than
500
mV.
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.
UL,
—
VARIABLE
FIXED
Input
Gain
Controls
©
and
©:
After
seiting
the
Input
Select
Switches
@
and
©
to
the
"VARIABLE"
position,
rotate
the
Input
Gain
Controls
©
and
©
with
a
#0
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
3552
has
built-in
protection
circuitry.
lf,
for
some
reason,
this
protection
circuit
is
activated,
the
indicator
turns
_
orange.
If
this
happens,
turn
the
system
off,
find
the
cause
of
the
problem
and
remedy
the
siiuaiion.
This
includes
checking
all
your
connections
and
wiring.
If
the
indicator
remains
orange
when
the
system
is
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.

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