Alpine 35278 User manual

OWNER’S MANUAL/BEDIENUNGSANLEITUNG/
MANUEL DU PROPRIETAIRE/MANUALE DEL PROPRIETARIO/
MANUAL DEL PROPIETARIO/BRUKSANVISNING
35278
4/3/2 Channel Power Amplifier

SYSTEM CHARTS/SYSTEMAUFBAU/DIAGRAMMES DU SYSTEME/DISPOSIZIONI DEL SISTEMA/
DIAGRAMAS DEL SISTEMA/SYSTEM-OVERSIKT
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SWITCHES AND TERMINALS/SCHALTER UND ANSCHLUSSE/COMMUTATEURS ET BORNES/INTERRUTTORI E
TERMINALI/INTERRUPTORES Y TERMINALES/OMKOPPLARE OCH ANSLUTNINGAR
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INSTALLATION/EINBAU/INSTALLATION/INSTALLAZIONE/INSTALACION/AINSTALLATION
@ Fig. 3/Abb. 3
CONNECTIONS/ANSCHLUSSE/CONNEXIONS/COLLEGAMENTI/CONEXIONES/ANSLUTNINGAR
"ENGLISH"
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TYPICAL SYSTEM CONNECTIONS 14-18
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PRECAUTIONS
CONNEXIONS
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INSTALLATION
REGLAGE DES COMMUTATEURS .
SPECIFICATIONS
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OMKOPPLARPOSITIONER .
SPECIFIKATIONER
@ CHARACTERISTIC CURVES/CHARAKTERISTISCHE ENTZERRERKURVEN/COURBES CARACTERISTIQUES/
CURVE CARATTERISTICHE/CURVAS CARACTERISTICAS/FREKVENSKURVOR

Fig. 1/Abb. 1

® Ground Lead
<>
@ Chassis
@ Holes
Fig. 2/Abb. 2
CONNECTIONS SSE Vesey Oe cO eee
_ CONEXIONES/ANSLUTNINGAR.
|
@
RCA
input
Jacks
@
Speaker
Output
Terminals
@ Speaker Input Leads
lal
8
©
®
(white)
MU ||
Front
;
Lett Speaker \© ® (White/Black)
9 C © (Gray)
Front
Right Speaker o® (Gray/Black)
@ Battery Lead (Yellow)
care
: © Remote Turn-On Lead (Blue/White)
@
@®
{Green)
=
Heat
e®@
(Green/Black)
wan
Left Speaker
® © B (violet)
Rear
Right
Speaker
\©
©
(violevBlack)
Fig. 3/Abb. 3

At
Alpine,
Sonic
Excellence
is
a
goal
we
consider
most
important.
Your
purchase
of
this
component
has
told
us
you
feel
the
same.
We
take
great
pride
in
the
long
tradition
of
excellence
in
sound
quality
and
reliability
that
the
Alpine
name
represents.
Now
as
a
part
of
that
tradition,
we
welcome
you
to
the
growing
number
of
discerning
audiophiles
who
own
Alpine
products.
This
manual
has
been
prepared
to
help
you
maximize
your
enjoyment
of
the
outstanding
performance
&
features
of
your
new
Alpine
3527S
4/3/2
Channel
Power
Amplifier.
This
power
amplifier
incorporates
many
advanced
technical
&
perform-
ance
features.
To
realize
the
exceptional
performance
for
which
this
product
is
capable,
it
is
necessary
that
all
signal
sources,
speakers
and
interconnec-
tion
devices
are
of
the
highest
sonic
quality.
We recommend Alpine Head-Units, Active Dividing Networks, Speaker
Systems,
High
Quality
Interconnection/Speaker
Cables
&
Accessories
wherever possible.
This
power
amplifier
is
capable
of
producing
over
100
watts
per
channel
in
its
2-channel
bridged
mode.
Therefore,
it
is
imperative
to
use
speakers
that
can
handle
such
high
power
levels.
Due
to
the
complexity
of
this
product,
we
strongly
recommend
that
the
3527S
be
installed
by
your
authorized
Alpine
dealer.
Please
study
this
manual
carefully
and
become
acquainted
with
all
the
special
features
and
capabilities
of
your
new
3527S.
Should
you
have
any
questions,
please
consult
your
authorized
Alpine
dealer.

4/3/2-CHANNEL
OPERATION
The 3527S can be used as:
a.
4-channel
amplifier,
producing
25W
per
channel
into
4
Q.
b.
3-channel
amplifier,
producing
70W
(4
Q)
into
channels
1
&
2,
and
140W
(4
Q)
into
the
third
channel.
c.
2-channel
amplifier,
producing
140W
per
channel
into
4
Q.
MULTIMODE
CAPABILITY
The
3527S
can
power
2
pairs
of
stereo
tweeter/midrange
satellites
and
1
or
2
bridged
subwoofers
simultaneously.
ACTIVE
DIVIDING
NETWORK
With
two
independent,
built-in
crossover
networks,
each
pair
of
the
3527S,
channels
will
operate
as
a
low-pass
(subwoofer),
high-pass
(tweeter/midrange
satellite)
or
full-range
amplifier.
The
crossover
is
fixed
at
80
Hz
(18
dB
per
octave).
ACOUSTIC
COMPENSATION
CIRCUITRY
A
selectable
(Off
or
On)
equalization
curve
can
be
added
to
the
amplifier's
output
signal,
compensating
for
the
inherent
non-linearities
of
the
automobile
interior.
It
extends
low
bass
response
and
eliminates
mid-bass
boominess,
giving
the
low
frequency
response
of
the
audio
system
tightness
and
accuracy.
DUO-8
FEEDBACK
CIRCUITRY
Alpine's
proprietary
Duo-Beta
is
a
technologically
advanced
form
of
feedback
circuitry.
Duo-Beta
supplies
low
negative
feedback
throughout
the
audio
fre-
quency
bandwidth
and
very
high
negative
feedback
at
DC.
This
stabilizes
the
amplifier,
removes
DC
offset,
and
offers
excellent
total
harmonic
distortion
(T.H.D.)
characteristics.
It
also
provides
low
transient
intermodulation
distortion
(T.I.M.),
excellent
slew
rate,
Stability,
and
musicality.
,
NO CURRENT LIMITING
Absence
of
current
limiters
in
the
audio
section
ensures
low
T.I.M.,
excellent
transient
response,
and
superb
sonic
quality.
LINE
LEVEL
AND
SPEAKER
LEVEL
INPUT
CAPABILITY
INPUT
MODE
SELECTOR
(MONO/ST/L+R)
This
switch
allows
the
user
to
specify
the
input
signal
entering
the
amplifier.
Among
other
benefits,
it
eliminates
the
need
for
RCA-type
Y-adaptors
when
bridging
the
amplifier.
INPUT
CHANNEL
SELECTOR
This
switch
allows
the
user
to
specify
the
input
signal
entering
channels
3
and
4
of
the
amplifier.

POWER MOSFET DC-TO-DC SWITCHING MODE POWER SUPPLY
Provides excellent power output throughout the audio bandwidth (20Hz to 20kHz).
lts soft clipping characteristics ensure superb transient response and musicality.
INDEPENDENT, CONTINUOUSLY ADJUSTABLE GAIN CONTROLS FOR
CH1/2 AND CH3/4
Allow different level settings for both pairs of channels.
GOLD-PLATED RCA INPUT CONNECTORS
For most accurate signal transmission and lowest possible loss. Gold-plated
terminals are immune to signal deterioration caused by corrosion in the connec-
tors that can develop over time.
GOLD-PLATED, SCREW-DOWN POWER AND SPEAKER TERMINALS
For high definition, minimum loss power transfer and oxidization resistance.
FULLY DISCRETE, COMPLEMENTARY OUTPUT CIRCUITRY
For excellent reliability, superb sonic performance and high current capability for
accurate transient response.
HIGH PERFORMANCE, LOW NOISE, AUDIOPHILE QUALITY ACTIVE AND
PASSIVE
COMPONENTS
For best possible performance and consistency from unit to unit.
THIRD-ORDER, (18 dB PER OCTAVE) CAPACITIVE/INDUCTIVE POWER
SUPPLY INPUT AND OUTPUT FILTERING
Prevents radio frequency interference (RFI) and immunity to system noises (such
as alternator whine).
S.T.A.R. CIRCUITRY
The Alpine-developed Signal Transit for Accurate Response circuit topology
improves sonic properties by reducing interaction between different sections of
the circuitry.
EXTRA HEAVY DUTY CONSTRUCTION
Glass-epoxy printed circuit boards and separate high current power transfer bus-
bars for primary voltage and ground connections inside the amplifier.
STATUS MONITOR
This indicator illuminates in green when the amplifier is on and operational. This
light will turn orange if any internal protection circuitry is activated. In case of an
installation problem, the STATUS MONITOR can aid in troubleshooting the
system.

Refer to Fig. 1 on page 5.
@ Status Monitor
@ Acoustic Compensation Switch
@ Input Gain Adjustment Control (Channels 1/2)
@® Active Dividing Network Mode Selector Switch (Channels 1/2)
© Input Mode Selector Switch (Channels 1/2)
© Input Gain Adjustment Control (Channels 3/4)
Active Dividing Network Mode Selector Switch (Channels 3/4)
Input Mode Selector Switch (Channels 3/4)
Input Channel Selector Switch
RCA Input Jacks (Channels 1/2)
QO@e9
Speaker Output Terminals (Channels 1/2)
Fuse Block
Battery Lead Terminal
Remote Turn-On Lead Terminal
Ground Lead Terminal
RCA Input Jacks (Channels 3/4)
Speaker Input Connector
Speaker Output Terminals (Channels 3/4)
BOGQOOO
@ Improper wiring connections could cause damage to your vehicle's electrical
system and/or the 3527S amplifier. Carefully follow the wiring instructions in this
manual.
@ Attaching the battery lead to the positive (+) terminal of the battery should be the
last connection after all other connections are made.
@ Due to the high power output of the 3527S, it is important that all connections are
clean and well secured, or damage could result.
@
Be
sure
that
the
3527S
is
mounted
in
a
way
that
will
allow
for
free
air
circulation
and
heat
dissipation.
@ When changing fuses, be sure to replace the old fuse with one of the same
amperage. Use of improper fuses can lead to serious damage to components.
10

Refer to Fig. 3 on page 6.
Before making connections, be sure to turn the power off to all audio components.
Insulation tubes for the speaker leads and the power supply leads are supplied with
the 3527S, route the speaker leads and the power supply leads separately through
these tubes.
CAUTION:
When the INPUT CHANNEL selector switch is in the 3/4 or 1+3/2+4 mode, keep
the CH 3/4 RCA inputs of the 3527S connected to a signal source at all times.
Failure to do so may result in very high output distortion during amplifier operation.
This is due to the special grounding characteristics that have been implemented
in the 3527S to prevent installation related noises from entering the system. ,
© Speaker Output Terminals
The 3527S has two sets of speaker outputs. Be sure to observe correct speaker
output connections and phasing. In the stereo mode, connect the right and left
positive outputs to the right and left positive speaker terminals; connect the right
and left negative outputs to the right and left negative speaker terminals.
In the bridged mode, connect the left positive output to the positive speaker
terminal and the right negative output to the negative speaker terminal.
NOTE:
Never connect any of the speaker leads together or to chassis ground.
@ Speaker Input Leads
When operating this amplifier with head units not equipped with preamp output
connectors, the Speaker Input leads should be used. These wires will connect
directly to the speaker output wires of the head unit. The 3527S will accept
output from either high power or standard power head units.
© RCA Input Jacks
Connect these jacks to the line out leads on your head unit using RCA extension
cables (sold separately). Be sure to observe correct channel connections; Left to
Left, Right to Right, Front to Front, and Rear to Rear.
© Battery Lead (Yellow)
Connect this lead directly to the positive (+) terminal of the vehicle's battery. Do
not connect this lead to wiring in the vehicle's electrical system. Be sure to add a
‘40 amp (or two 20A fuses in parallel) as close as possible to the battery's positive
(+) terminal. This fuse will protect your vehicle's electrical system in case of a
short circuit. If you need to extend this lead, the wire gauge should be 8 AWG or
larger.
11

© Remote Turn-On Lead (Blue/White)
Connect
this
lead
to
the
remote
turn-on
or
power
antenna
(positive
trigger,
(+)
12V only) lead of your head unit.
© Ground Lead (Black)
Connect
this
lead
securely
to
a
clean,
bare
metal
spot
on
the
vehicle's
chassis.
Verify
this
point
to
be
a
true
ground
by
checking
for
continuity
between
that
point
and
the
negative
(—)
terminal
of
the
vehicle's
battery.
Ground
all
your
audio
components
to
the
same
point
on
the
chassis
to
prevent
ground
loops.
@ insulation Tube
Use
these tubes
to
cover
the
power
and
speaker
terminals
after
connections
have
been
made.
This
will
prevent
inadvertent
shorting
of
the
terminals.
® Front Left Speaker
© Front Right Speaker
@ Rear Left Speaker
@® Rear Right Speaker
® White
® White/Black
® Gray
® Gray/Black
© Green
@ Green/Black
® Violet
® Violet/Black
12

Please
check
your
head
unit
for
the
conditions
listed
below:
a.
The
head
unit
does
not
have
a
remote
turn-on
or
power
antenna
lead.
b.
The
head
unit's
power
antenna
lead
is
activated
only
when
the
radio
is
on
(turns
off
in
the
tape
or CD
Mode).
c.
The
head
unit's
power
antenna
lead
is
logic
level
output
(+)
5V,
negative
trigger
(grounding
type),
or
cannot
sustain
(+)
12V
when
connected
to
other
equipment
in
addition
to
the
vehicle's
power
antenna.
If
any
of
the
above
conditions
exist,
the
remote
turn-on
lead
of
your
3527S
must
be
connected
to
a
switched
power
source
(ignition)
in
the
vehicle.
Be
sure
to
use
a
3A
fuse
as
close
as
possible
to
this
ignition
tap.
Using
this
connection
method,
the
3527S
will
turn
on
and
stay
on
as
long
as
the
ignition
switch
is
on.
If
this
is
objectionable,
a
SPST
(Single
Pole,
Single
Throw)
switch,
in
addition
to
the
3A
fuse
mentioned
above,
may
be
installed
in-line
on
the
3527S
turn-on
lead.
This
switch
will
then
be
used
to
turn
on
(and
off)
the
3527S.
Therefore,
the
switch
should
be
mounted
so
that
is
accessible
by
the
driver.
Make
sure
the
switch
is
turned
off
when
the
vehicle
is
not
running.
Otherwise,
if
the
amplifier
will
remain
on
and
drain
the
battery.
Remote Turn-On Lead
(Blue/White)
‘= ve =I Fuse (3A)
| Ignition
| As close as la)
P r
Fhe ks — — = possible to
SPST Switch the vehicle's
(optional) ignition tap
Remote Turn-On
Lead
To other Alpine components’
Remote Turn-On leads
13

- | 6 @
4-CHANNEL OPERATION: High-Pass Satellites or Full-Range Speakers
SWITCH SETTINGS
INPUT MODE FILTER INPUT CHANNEL ACOUSTIC COMPENSATION
Pout iia ial Q ra
OFF HP LP
eer sib eae
De BE Dera
(+)
Front Left) |
+)
(+)
(+) Pv
3
| (Rear Left) ~
oer
Right)
O
(+)
RCA
CH4
Extension
|
(Rear
Right)
Cable
-)
Battery (+) Lead
(Yellow)
BBp > Battery (+) Lead
B=<> Ground Lead
* ee
=
CH 1(—)(White/Black)
CH 2(+)(Gray)
xf} [nm
Gray/
Sach
Head
Unit
with
paeOn
or:
Speaker
Outputs
Only
®
*
|
Power
Antenna
;
| Remote
Head Unit or Signal Processor! Turn-On or
with Front and Rear Pre-Amp | Power diiblen |
Outputs @ *
Notas * Use Connection ® or ® , But Never Both.
** 412V Should be Supplied to this Terminal to Turn the 3527S On.
*** Extension Cables are Sold Separately.
See
Remote Turn-On Lead
14

3-CHANNEL OPERATION: 2 High-Pass Satellites and 1 Mono Subwoofer
a SETTINGS
a | MODE or] INPUT CHANNEL. ACOUSTIC | ACOUSTIC COMPENSATION |
[a]
of ‘on
Cal
Ca OFF ay
(+) sr cH] Submootor
CH 1 |
(Left Satellite)
(+)
| einen)
(+) rm)
CH2
(Right Satellite) E
eee 6,
RCA
Extension
Cable
Fes Battery (+) Lead
Bx<> Ground Lead
CH 4(-)(Violet/Black)
CH 4(+)(Violet)
CH 3(-)(Green/Biack)
CH 3(+)
(Green)
U
Remote
Turn-On or
ly @* Power Antenna i
Head Unit with
Speaker Outputs Only
Remote :
Head Unit or Signal Processor} Turn-Onor |
with Front and Rear Pre-Amp | Power aeebad
Outputs ® *
Notes: * Use Connection ® or ®, But Never Both.
** 412V Should be Supplied to this Terminal to Turn the 3527S On.
*** Extension Cables are Sold Separately.
Remote Turn-On Lead
15

SWITCH SETTINGS
INPUT MODE FILTER INPUT CHANNEL ACOUSTIC COMPENSATION
Go| Ge)
CH 2 Prof errs
brn! OFF HP LP
CHOX(MONO)
ST
CHi}+12}
Fin
Reng
eae
Cal
a 24
i] fa] De Ba Oe OFF = ON
CH 3/4 eo
mit OFF HP LP | OFF HP LP
CHEIMONO) ST CHEK} ~ cui pange Satellites
(+)
| CH 3/4
(Right)
=) Speaker
Extension
Cable
» Battery (+) Lead
f= Ground Lead
Speaker :
H Input :
: Leads ‘
Apa” Sie a CH 4(4)(White) Ill CH 3(-)(Green/Black)
a ;
CH 1(-)(White/Black) ||I{ CH 3(+)(Green) :
Note: Do Not Use CH 2(+)
(Gray), CH 2(-) (Gray/Black),
CH 4(+) (Violet) and CH 4(-)
(Violet/Black).
Insulate Exposed Conductors
Remote
Turn-On or
Head Unit with
Speaker Outputs Only ®* | Power Antenna ;
ne heheen tus acercenscsssepcesttessvageawenescentectedsneeacase- Sena? ! SS
1 Processor] | Remote _ ese
Head Unit or Signal Processor
With Pre-Amp
Outputs ® *
Turn-On or
Power Antenna ! Remote Turn-On Lead
Notes: * Use Connection ® or ® , But Never Both.
** +12V Should be Supplied to this Terminal to Turn the 3527S On.
** Extension Cables are Sold Separately.
16

2-CHANNEL OPERATION-B: Non-Fading Subwoofers
SWITCH SETTINGS
INPUT MODE FILTER INPUT CHANNEL ACOUSTIC COMPENSATION
on| Coal a
OFF HP LP
co) St HTH Sibioctara
—1o
BAH
CH 3/4
of dp ‘Tp
cHtajwoo) er Boo Subwoofers
(+) (+)
CH 1/2 i
cael
| CH 3/4
Subwoofer
(2)
RCA
Extension
Cable
E83 Battery (+) Lead
E
BECKS Ground Lead
aaa t
Input :
Leads :
CH 4(-)(Violet/Black)
CH 4(+)(Violet)
CH 3(-)(Green/Black)
CH 3(+)
(Green)
U
mm 0 <c Tirce
mH] 0 <c{ im
iw
Head Unit with a
Speaker Outputs Only ®
Remote
Head Unit or Signal Processor} Turn-On or ;
with Front and Rear Pre-Amp | Power Ante:
Outputs ® *
Notes: * Use Connection ® or © , But Never Both.
** +12V Should be Supplied to this Terminal to Turn the 3527S On.
*** Extension Cables are Soid Separately.
Remote Turn-On Lead
17

MULTIMODE
OPERATION:
2
Pairs
of
High-Pass
Satellites,
and
1
or
2
Subwoofers
INPUT
MODE
INPUT
CHANNEL
|
ACOUSTIC
COMPENSATION
ae
zr
tonal
Eas?
Ca
CHEMONO)
st
CHORE]
La
tinge
oq
OFF
ON
CH 1(+)(White) ,,C* i@ cH1
Front Left
()
CH
1(-)(White/Black)
(Satelite)
i] a ee CH 2(+)(Gray) (+)
¢ +; ray; CH14
(Optional)
roar
Front
Right
a oo Geue
CH 2(-)(Gray/Black) iw)
Cocaine
cainane
masa
fe
nee
pee
one
;
}
(1)
00d
CH 3(+)(Green) 1. **** (+)
ct, (+) CH3
Rear Left
atellite)
CH 3(-)(Green/Black) ¢)
CH 4(+)(Violet) (+) q cH4
om || | (Rear Right
CH 4(-)(VioletiBlack) (= Sata
RECS Ground Lead
B Battery (+) Lead
CH 1(+)(White)
‘GH 1(-)(White/Black)
Remote
Turn-On or
Power Antenna
Head Unit with Re
Speaker Outputs Only ®
Remote
Turn-On or
Power Antenna
Head Unit or Signal Processor
with Front and Rear Pre-Amp
Outputs ® *
Remote Turn-On Lead
Notes:
*
Use
Connection
®
or
®
,
But
Never
Both.
*“*
Extension
Cables
are
Sold
Separately.
**
+12V
Should
be
Supplied
to
this
Terminal
to
Turn
“*
L:
6.2mH,
Air
Core
inductor,
16
AWG
Min.
the
3527S
On.
C:
300pF,
100Voit.
Non-Polarized
Capacitor.
18

Refer to Fig. 2 on page 6.
Due
to
the
high
power
output
of
the
3527S,
considerable
heat
is
produced
when
the
amplifier
is
in
operation.
For
this
reason,
the
amplifier
should
be
mounted
in
a
location
which
will
allow
for
free
circulation
of
air,
such
as
inside
the
trunk.
For
alternate
installation
locations,
please
contact
your
authorized
Alpine
dealer.
1.
Using
the
amplifier
as
a
template,
mark
the
four
screw
locations.
2.
Make
sure
there
are
no
objects
behind
the
surface
that
may
become
damaged
during
drilling.
3. Drill the screw holes.
4.
Position
the
3527S
over
the
screw
holes,
and
secure
with four
self-tapping
screws.
NOTE:
To
securely
connect
the
ground
lead,
use
an
already
installed
screw
on
the
metal
part of the vehicle (marked (x)).
@® Self-Tapping Screws (M4 x 14)
@ Ground Lead
@® Chassis
@ Holes
19

input Mode Selector Switches © and
The
following
switch
descriptions
apply
to
CH
1/2.
The
same
explanations
will
also
apply
to
CH
3/4.
Simply
replace
the
call-outs
for
CH
1
with
CH
3;
replace
1+2
with
3+4.
a)
Set
to
the
"ST"
position
(center)
when
the
two
channels
are
used
in
stereo.
TH
CH[i](MONO) ST CH[1]+[2]
b)
Set
to
the
"|1]
(MONO)"
position
when
the
two
channels
are
used
for
one
channel
of
a
stereo
or
bridged
system.
II
T—
CH[1] (MONO) ST CH[f]}+[2]
c)
Set
to
the
[1]
+ [2]
"
position
when
the
two
channels
are
used
for
a
subwoofer
system
which
uses
the
right
channel
and
left
channel
signals
summed.
<TH
CH[1] (MONO) ST CH[t]+[2]
Active
Dividing
Network
Mode
Selector
Switches
©
and
@
a)
Set
to
the
"LP"
position
when
the
amplifier
is
used
for
the
low-pass
(subwoofer)
system.
The
frequencies
higher
than
80
Hz
will
be
cut
(at
a
rate
of
18
dB
per
octave).
A
TS
OFF HP LP
20

b)
Set
to
the
"HP"
position
when
the
3527S
is
used
for
the
high-pass
(tweeter/
midrange)
system.
The
frequencies
lower
than
80
Hz
will
be
cut
(at
a
rate
of
18
dB
per
octave).
Ht
TH
OFF HP LP
c)
Set
to
the
"OFF"
position
when
the
3527S
is
used
for
the
regular
stereo
system
with
full-range
speakers.
The
full
bandwidth
will
be
output
without
cutting
the
high
or low frequencies.
clos
HP
OFF LP
Input Gain Adjustment Controls © and ©
After
setting
your
head
unit's
volume
control
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
in
green
when
the
power
is
on.
The
3527S
has
built-in
protection
circuitry.
If,
for
some
reason,
this
protection
circuit
is
activated,
the
indica-
tor
turns
orange.
If
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
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
turn
on
muting
circuit
is
activated.
This
is
normal.
21

Input Channel Selector Switch © (CH 3/4)
a) Setting this switch to [1] / [2] will send the signal at the inputs of CH1/2 to CH3/4
of the 3527S. This eliminate the need for Y-adaptors when using a head unit with
a single pair of pre-amp output.
b) Set this switch to [3] / [4] to have the inputs of CH3/4 accept independent input
signals. An example of this application would be the use of a head unit with dual
pre-amp outputs.
c) Setting this switch to [1] + [3] / [2] + [4] will sum the CH1 & CH@ input and send it
to CH3 while the CH2 & CH4 inputs are summed and sent to CH4. When used
with a dual-preamp output head unit, this will provide a non-fading (constant
bass) subwoofer output with fadable front and rear output going to a separate
Satellite amplifier.
Neen
(if2] [34] G+{3)f2}4[4]
i
Acoustic Compensation Selector Switch
a)
Turn
this
switch
on
to
compensate
for
the
loss
of
low
bass
and
to
reduce
midbass
boominess.
b)
Listen
to
the
system
with
the
switch
in
both
the
ON
and
OFF
positions.
Since
the
response
of
the
system
can
vary
depending
on
vehicle
type,
interior
size, and
other
characteristics
of
the
listening
area,
choose
the
position
that
provides
the
best sound reproduction.
OFF ON