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
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CONNECTIONS/ANSCHLUSSE/CONNEXIONS/COLLEGAMENTI/CONEXIONES/ANSLUTNINGAR
"ENGLISH"
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TYPICAL SYSTEM CONNECTIONS 14-18
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SWITCH SETTINGS 20-22
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TYPISCHE SYSTEMANSCHLUSSE 31—35
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PRECAUTIONS
CONNEXIONS
CONNEXIONS TYPIQUES
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INSTALLATION
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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