Alpine R-A90S User manual

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
EN
FR
ES
FOR CAR USE ONLY/POUR APPLICATION AUTOMOBILE/PARA USO EN AUTOMÓVILES
• OWNER’S MANUAL
Please read before using this equipment.
• MODE D’EMPLOI
Veuillez lire avant d’utiliser cet appareil.
• MANUAL DE OPERACIÓN
Léalo antes de utilizar este equipo.
1-7, Yukigaya-Otsukamachi, Ota-ku,
Tokyo 145-0067, JAPAN
Phone: [phone]
1500 Atlantic Blvd, Auburn Hills,
Michigan 48326, U.S.A.
Phone 1-800-ALPINE-1 (1-800-257-4631)
161-165 Princes Highway, Hallam
Victoria 3803, Australia
Phone [phone]
Ohmstraße 4
85716 Unterschleißheim, Germany
Phone: [phone]
Alpine House
Fletchamstead Highway, Coventry CV4 9TW, U.K.
www.alpine.co.uk
184 allée des Erables
CS 52016 – Villepinte
95 945 Roissy CDG cedex
FRANCE
Phone : + 33(0)1 48 63 89 89
Viale Cristoforo Colombo, 8
20090 Trezzano sul Naviglio MI, Italy
Phone [phone]
Portal de Gamarra 36, Pabellón, 32
01013 Vitoria (Alava)-APDO 133, Spain
Phone [phone]
R-A90S
6 CHANNEL POWER AMPLIFIER
Qingdao Brothers Packaging Co., Ltd
Xichenghui Industrial Park,Chengyang District,Qingdao City,China
Designed by ALPINE Japan
Printed in Korea
68-35792Z94-A (Y-A5)
M3514710010

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
1-EN
EN
FR
ES
English
CONTENTS
WARNING................................................................................1
SERVICE CARE .......................................................................2
ABOUT THE PROTECTION CIRCUIT ................................2
ACCESSORIES........................................................................3
INSTALLATION.......................................................................3
ATTACHING THE LOGO PLATE.........................................3
CONNECTIONS .....................................................................4
CONNECTION CHECK LIST................................................7
SWITCH SETTINGS...............................................................8
SYSTEM DIAGRAMS ......................................................... 12
SPECIFICATIONS................................................................ 20
WARNING
Points to Observe for Safe
Usage
Read this manual carefully before using the system
components. They contain instructions on how to
use this product in a safe and effective manner.
Alpine cannot be responsible for problems
resulting from failure to observe the instructions in
this manual.
WARNING
This symbol means important instructions.
Failure to heed them can result in serious
injury or death.
DO NOT OPERATE ANY FUNCTION THAT TAKES YOUR
ATTENTION AWAY FROM SAFELY DRIVING YOUR
VEHICLE.
Any function that requires your prolonged attention
should only be performed after coming to a complete
stop. Always stop the vehicle in a safe location before
performing these functions. Failure to do so may result in
an accident.
KEEP THE VOLUME AT A LEVEL WHERE YOU CAN STILL
HEAR OUTSIDE NOISES WHILE DRIVING.
Excessive volume levels that obscure sounds such as
emergency vehicle sirens or road warning signals (train
crossings, etc.) can be dangerous and may result in an
accident. LISTENING AT LOUD VOLUME LEVELS IN A CAR
MAY ALSO CAUSE HEARING DAMAGE.
DO NOT DISASSEMBLE OR ALTER.
Doing so may result in an accident, fire or electric shock.
USE THIS PRODUCT FOR MOBILE 12V APPLICATIONS.
Use for other than its designed application may result in
fire, electric shock or other injury.
USE THE CORRECT AMPERE RATING WHEN REPLACING
FUSES.
Failure to do so may result in fire or electric shock.
DO NOT BLOCK VENTS OR RADIATOR PANELS.
Doing so may cause heat to build up inside and may result
in fire.
MAKE THE CORRECT CONNECTIONS.
Failure to make the proper connections may result in fire or
product damage.
USE ONLY IN CARS WITH A 12 VOLT NEGATIVE GROUND.
(Check with your dealer if you are not sure.) Failure to do so
may result in fire, etc.
BEFORE WIRING, DISCONNECT THE CABLE FROM THE
NEGATIVE BATTERY TERMINAL.
Failure to do so may result in electric shock or injury due to
electrical shorts.
DO NOT ALLOW CABLES TO BECOME ENTANGLED IN
SURROUNDING OBJECTS.
Arrange wiring and cables in compliance with the manual
to prevent obstructions when driving. Cables or wiring
that obstruct or hang up on places such as the steering
wheel, gear lever, brake pedals, etc. can be extremely
hazardous.
DO NOT SPLICE INTO ELECTRICAL CABLES.
Never cut away cable insulation to supply power to other
equipment. Doing so will exceed the current carrying
capacity of the wire and result in fire or electric shock.
DO NOT DAMAGE PIPE ORWIRING WHEN DRILLING
HOLES.
When drilling holes in the chassis for installation, take
precautions so as not to contact, damage or obstruct
pipes, fuel lines, tanks or electrical wiring. Failure to take
such precautions may result in fire.

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
2-EN
AC
C
• Self-Ta
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• Mount
• Logo P
• Hexag
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DO NOT USE BOLTS OR NUTS IN THE BRAKE OR
STEERING SYSTEMS TO MAKE GROUND CONNECTIONS.
Bolts or nuts used for the brake or steering systems (or any
other safety-related system), or tanks should NEVER be
used for installations or ground connections. Using such
parts could disable control of the vehicle and cause fire etc.
KEEP SMALL OBJECTS SUCH AS BATTERIES OUT OF THE
REACH OF CHILDREN.
Swallowing them may result in serious injury. If swallowed,
consult a physician immediately.
CAUTION
This symbol means important instructions.
Failure to heed them can result in injury or
property damages.
HALT USE IMMEDIATELY IF A PROBLEM APPEARS.
Failure to do so may cause personal injury or damage to
the product. Return it to your authorized Alpine dealer or
the nearest Alpine Service Center for repairing.
HAVE THE WIRING AND INSTALLATION DONE BY
EXPERTS.
The wiring and installation of this unit requires special
technical skill and experience. To ensure safety, always
contact the dealer where you purchased this product to
have the work done.
USE SPECIFIED ACCESSORY PARTS AND INSTALL THEM
SECURELY.
Be sure to use only the specified accessory parts. Use of
other than designated parts may damage this unit
internally or may not securely install the unit in place. This
may cause parts to become loose resulting in hazards or
product failure.
ARRANGE THE WIRING SO IT IS NOT CRIMPED OR
PINCHED BY A SHARP METAL EDGE.
Route the cables and wiring away from moving parts (like
the seat rails) or sharp or pointed edges. This will prevent
crimping and damage to the wiring. If wiring passes
through a hole in metal, use a rubber grommet to prevent
the wire’s insulation from being cut by the metal edge of
the hole.
DO NOT INSTALL IN LOCATIONS WITH HIGH MOISTURE
OR DUST.
Avoid installing the unit in locations with high incidence of
moisture or dust. Moisture or dust that penetrates into this
unit may result in product failure.
SERVICE CARE
IMPORTANT NOTICE
This Amplifier has been type tested and found to
comply with the limits for a Class B computing
device in accordance with the specifications in
Subpart J of Part 15 of FCC Rules. This equipment
generates and uses radio frequency energy, and it
must be installed and used properly in accordance
with the manufacturer’s instructions.
SERIAL NUMBER:
INSTALLATION DATE:
INSTALLATION TECHNICIAN:
PLACE OF PURCHASE:
IMPORTANT
Please record the serial number of your unit in
the space provided here and keep it as a
permanent record. The serial number plate is
located on the rear of the unit.
For European Customers
Should you have any questions about warranty,
please consult your store of purchase.
For Customers in other Countries
IMPORTANT NOTICE
Customers who purchase the product with which
this notice is packaged, and who make this
purchase in countries other than the United States
of America and Canada, please contact your dealer
for information regarding warranty coverage.
ABOUT THE PROTECTION
CIRCUIT
If an abnormality such as an electrical short circuit
occurs, too high a current is supplied, etc. a
Protection Circuit starts to run and the unit stops
outputting sound to prevent the amplifier and
speakers from malfunctioning. If such an
abnormality occurs, the Power Indicator lights up in
red. In this case, refer to“About Power Indicator”
(page 11) for the cause and remedy.

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
3-EN
EN
FR
ES
ACCESSORIES
• Self-Tapping Screw (M4 × 14)......................................4
• Mounting Bracket and Screws ......................... 4 SETS
• Logo Plate*.........................................................................1
• Hexagon Wrench (Large/Small)..........................1 SET
 The Logo Plate is temporarily affixed to the top cover.
INSTALLATION
Due to the high power output of the R-A90S
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. Attach the Mounting Brackets to the bottom of
the amplifier with eight screws.
Screws (× 8)
(included)
Mounting Bracket
(included)
2. Using the amplifier as a template, mark the four
screw locations.
3. Make sure there are no objects behind the
surface that may become damaged during
drilling.
4. Drill the screw holes.
5. Position the R-A90S over the screw holes, and
secure with four self-tapping screws.
Self-Tapping Screws
M4 × 14 mm (× 4) (included)
Holes (× 4)
ATTACHING THE LOGO
PLATE
The Logo Plate is temporarily affixed to the top
cover.
1. Peel the Logo Plate along with the backing
sheet from the top cover.
2. Peel the backing sheet from the Logo Plate, then
attach it to this unit in your desired direction.
Backing Sheet
Logo Plate
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ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
4-EN
Pow
e
Conn
e
Lead
(
Hexa
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Termi
• For
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Fuse
30 A
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CONNECTIONS
Before making connections, be sure to turn the power off to all audio components.
*3, 4
*1
Vehicle’s chassis Vehicle’s battery
External Fuse*2
*1 For details on the wires size to be used, refer to the supplied“Cautions on Power Supply Wires Connection”and
“Cautions on Power Supply Wires”(page 19), and then use the wire of the specified size.
*2 Be sure to add an External Fuse (e.g. Fuse Block, Circuit Breaker) with the battery lead as close as possible to the
battery’s positive (+) terminal. Add an external fuse with the same capacity, or a slightly larger capacity, as the sum total
of the fuse capacities of the amplifier.
For details on the fuse capacity of this machine, see“Battery Lead ( )”(page 5).
*3 Connect all equipment to the same ground point while keeping wire length as short as possible.
*4 To securely connect the ground lead, use an already installed screw.
To prevent external noise from entering the audio system
• Locate the unit and route the leads at least 10 cm (4”) away from the vehicle’s harness.
• Keep the battery power leads as far away from other leads as possible.
• Connect the ground lead securely to a bare metal spot (remove any paint or grease if necessary) of the vehicle’s
chassis.
• If you add an optional noise suppressor, connect it as far away from the unit as possible. Your Alpine dealer
carries various noise suppressors, contact them for further information.
• Your Alpine dealer knows best about noise prevention measures so consult your dealer for further information.

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
5-EN
EN
FR
ES
Power Supply Terminal
Connect the Battery Lead ( ), Remote Turn-on
Lead ( ), and Ground Lead ( ) using the
Hexagon hole screw of the Power Supply
Terminal ( ).
• For details on how to connect, see“Cautions
on wire lead connections”(page 6).
Fuse
30 A × 3
USE THE CORRECT AMPERE RATING WHEN
REPLACING FUSES.
Failure to do so may result in fire or electric
shock.
RCA Input Jacks
Connect these jacks to the line out leads on your
head unit using RCA extension cables or
Speaker-RCA Conversion cable (sold separately).
Be sure to observe correct channel connections;
Left to Left and Right to Right.
Speaker Output Terminals
Connect the Speaker Output Lead (+) / (–) using
the Hexagon hole screw of the Speaker Output
Terminals ( ).
• For details on how to connect, see“Cautions
on wire lead connections”(page 6).
Be sure to observe correct speaker output
connections and polarity in relation to the other
speakers in the system. Connect the positive
output to the positive speaker terminal and the
negative to negative.
About Bridged Connections
In the bridged mode, connect the left positive to
the positive terminal of the speaker and the
right negative to the negative terminal of the
speaker. Do not use the speaker (–) terminals as
a common lead between the left and right
channels.
NOTE:
• Do not connect the speaker (–) terminal to the
vehicle’s chassis.
Battery Lead (sold separately)
Be sure to add an External Fuse (e.g. Fuse Block,
Circuit Breaker) with the battery lead 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. See below for
appropriate fuse value requirement:
90 amp fuse
• For details on the wires size to be used, refer to
the supplied“Cautions on Power Supply Wires
Connection”and “Cautions on Power Supply
Wires”(page 19), and then use the wire of
the specified size.
Remote Turn-On Lead (sold separately)
Connect this lead to the remote turn-on
(positive trigger, (+) 12 V only) lead of your head
unit. If a remote turn-on lead is not available, see
“CONNECTION CHECK LIST” section on
page 7 for alternative method.
• When connecting the speaker output leads of
the head unit to this unit with a Speaker-RCA
Conversion cable (sold separately), you do not
need to connect the remote turn-on lead,
owing to the“REMOTE SENSING”function of
this unit. However, the “REMOTE SENSING”
function may not work depending on the
signal source connected. In such a case,
connect the remote turn-on lead to an
incoming power supply cord (accessory
power) in the ACC position.
Ground Lead (sold separately)
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 while keeping
wire length as short as possible.
• For details on the wires size to be used, refer to
the supplied“Cautions on Power Supply Wires
Connection”and “Cautions on Power Supply
Wires”(page 19), and then use the wire of
the specified size.
d
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s
um total
vehicle’s
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r
mation.

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
6-EN
CO
N
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Cautions on wire lead connections
When using third-party wire cables (power supply
wire), use the supplied screws to simplify the
connection. Refer to the description below for the
proper procedure. If you are in doubt about how to
make this connection, consult your dealer.
1. Check the wire size.
• For details on the wires size to be used, refer to
the supplied“Cautions on Power Supply Wires
Connection”and “Cautions on Power Supply
Wires”(page 19), and then use the wire of
the specified size.
• If the wire gauge used is unknown, ask your
dealer.
2. Remove the insulation from the ends of the wire
leads by about 7 – 10 mm (9/32”– 13/32”).
Lead end side of
the product
Twist the tip of wire leads
7 – 10 mm
(9/32”– 13/32”)
NOTES:
• If length of the exposed wire is too short, a poor
connection may occur causing operation failure
or sound interruption.
• On the other hand, if the length is too long, an
electrical short-circuit may occur.
3. Tighten the hexagon hole screw with the
hexagon wrench (Large or Small) (included) to
secure the lead.
Before making this connection, use insulated
shrink tubing to cover any exposed wire
extending beyond the terminal.
Power Supply Terminal
Hexagon Wrench (included)
Battery Lead
Remote Turn-On Lead
Power Supply Terminal
Ground Lead
Hexagon hole
screw
Speaker Output Terminals
Hexagon Wrench (included)
Hexagon hole screw
Speaker Output Lead (–)
Speaker Output Lead (+)
Speaker Output
Terminals
NOTES:
• Be sure to use the Hexagon hole screw attached
to the Power Supply Terminal ( ) or Speaker
Output Terminals ( ).
• For safety reasons, connect the battery leads last.
• To prevent disconnection of the leads or
dropping of the unit, do not use the cabling to
carry the unit.

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
7-EN
EN
FR
ES
CONNECTION CHECK LIST
Please check your head unit for the conditions
listed below:
Remote Turn-On Lead
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 (+) 5 V, negative trigger (grounding
type), or cannot sustain (+) 12 V 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 R-A90S must be connected
to a switched power source (ignition) in the
vehicle. Be sure to use a 3 A fuse as close as
possible to this ignition tap. Using this
connection method, the R-A90S 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 3 A fuse
mentioned above, may be installed in-line on
the R-A90S turn-on lead. This switch will then be
used to turn on (and off) the R-A90S. 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, the amplifier will remain on and
drain the battery.
Blue/White
Power Antenna
Remote Turn-On Lead
To other Alpine component’s Remote Turn-On
Leads
SPST Switch (optional)
Fuse (3 A)
As close as possible to the vehicle’s ignition tap
Ignition Source
Amplifier
e
r Output
n
als
t
ached
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ker
a
ds last.
n
g to

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
8-EN
Cros
s
FRE
Q
Use t
h
frequ
e
Cros
s
FRE
Q
Use t
h
frequ
e
Inpu
t
Cros
s
(CHA
N
SWITCH SETTINGS
• Before switching each Selector Switch, turn off the power and insert a small screwdriver, etc.,
perpendicularly to the Switch.
(Front Side)
(Rear Side)
Input Gain Adjustment Control
Set the R-A90S input gain to the minimum
position. Using a dynamic CD as a source,
increase the head unit volume until the output
distorts. Then, reduce the volume 1 step (or until
the output is no longer distorted). Now, increase
the amplifier gain until the sound from the
speakers becomes distorted. Reduce the gain
slightly so the sound is no longer distorted to
achieve the optimum gain setting.
Crossover Mode Selector Switch
(CHANNEL-1/2)
a) Set to the “OFF” position when the
amplifier will be used for driving
full range speakers or when using
an external electronic crossover.
The full frequency bandwidth will
be output to the speakers with no
high or low frequency attenuation.
b) Set to the“HP” position when the
amplifier is used to drive a tweeter/
midrange system.
At this setting, Crossover Frequency
Adjustment Knob ( ) provides
adjustment between 50 Hz to 400
Hz. The frequencies below the
crossover point will be attenuated
at 12 dB/octave.
NOTE:
• In this case the maximum Bass EQ
boost level is reduced.
c) Set to the“HP-H”position when the
amplifier is used to drive a tweeter
system.
At this setting, Crossover Frequency
Adjustment Knob ( ) provides
adjustment between 400 Hz to 6
kHz. The frequencies below the
crossover point will be attenuated
at 12 dB/octave.

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
9-EN
EN
FR
ES
Crossover Frequency Adjustment Knob (HP
FREQ.)
Use this control to adjust the crossover
frequency between 50 Hz to 400 Hz.
Crossover Frequency Adjustment Knob (HP-H
FREQ.)
Use this control to adjust the crossover
frequency between 400 Hz to 6 kHz.
Input Channel Selector Switch (CHANNEL-3/4)
a) This switch setting is for selecting
either 2-channel or 4-channel input
mode. When set to “1/2”, the signal
will be copied from CH-1/2 and
sent to CH-3/4, eliminating the
need for Y-adapters.
b) Setting this switch to“3/4” will keep
both inputs, CH-1/2 and CH-3/4
independent.
A 4-channel source is required for
this mode.
Crossover Mode Selector Switch
(CHANNEL-3/4)
a) Set to the “OFF” position when the
amplifier will be used for driving
full range speakers or when using
an external electronic crossover.
The full frequency bandwidth will
be output to the speakers with no
high or low frequency attenuation.
b) Set to the“HP” position when the
amplifier is used to drive a tweeter/
midrange system.
At this setting, Crossover Frequency
Adjustment Knob ( ) provides
adjustment between 50 Hz to 400
Hz. The frequencies below the
crossover point will be attenuated
at 12 dB/octave.
c) Set to“BP” if the amplifier is used to
drive a midbass or midrange
speaker.
Frequencies lower than the
specified frequency set by
Crossover Frequency Adjustment
Knob ( ), and higher than the
frequency specified set by
Crossover Frequency Adjustment
Knob ( ), are attenuated at 12 dB/
octave.
Crossover Frequency Adjustment Knob (HP/
BP-L FREQ.)
Use this control to adjust the crossover
frequency between 50 Hz to 400 Hz.
NOTE:
• When the Crossover Mode Selector Switch ( )
is set to [BP], adjust the Crossover Frequency
Adjustment Knob ( ) and ( ).
Crossover Frequency Adjustment Knob (BP-H
FREQ.)
Use this control to adjust the crossover
frequency between 400 Hz to 6 kHz.
NOTES:
• When the Crossover Mode Selector Switch ( )
is set to [BP], adjust the Crossover Frequency
Adjustment Knob ( ) and ( ).
• When the Crossover Mode Selector Switch ( )
is set to [HP], adjustment of the Crossover
Frequency Adjustment Knob ( ) is disabled.
Input Channel Selector Switch (CHANNEL-5/6)
a) This switch setting is for selecting
either 2-channel or 4-channel +
Subwoofer input mode. When set
to“1/2”, the signal will be copied
from CH-1/2 and sent to CH-5/6,
eliminating the need for Y-adapters.
b) Setting this switch to“5/6” will keep
both inputs, CH-1/2 and CH-5/6
independent.
A 4-channel + Subwoofer source is
required for this mode.
Crossover Mode Selector Switch
(CHANNEL-5/6)
a) Set to the “OFF” position when the
amplifier will be used for driving
full range speakers or when using
an external electronic crossover.
The full frequency bandwidth will
be output to the speakers with no
high or low frequency attenuation.
b) Set to the“LP” position when the
amplifier is used to drive a
subwoofer.
At this setting, Crossover Frequency
Adjustment Knob ( ) provides
adjustment between 50 Hz to 400
Hz. The frequencies above the
crossover point will be attenuated
at 12 dB/octave.
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ide)
i
de)
e
n the
t
weeter/
e
quency
i
des
to 400
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he
n
uated
Bass EQ
w
hen the
t
weeter
e
quency
i
des
z
to 6
the
n
uated

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
10-EN
About
Lights u
p
Is off wh
e
Indic
a
Blue
Red
(blinkin
g
Red
Crossover Frequency Adjustment Knob
(LP FILTER)
Use this control to adjust the crossover
frequency between 50 Hz to 400 Hz.
Remote Bass Control
Connect the Remote Bass Control Unit
RUX-KNOB.2 (sold separately) to adjust the
output level remotely. This is not to replace
appropriate gain level setting between the
amplifier and head unit.
Speaker Input Level Switch
Switch according to the Speaker input mode.
a) When making a speaker input
connection with RCA Extension
Cables (sold separately), set to“LO”.
b) When making a speaker input
connection with Speaker-RCA
Conversion Cables (sold separately),
set to“HI”.
[BP-L] Adjustment range [BP-H] Adjustment range
50 Hz 400 Hz 6 kHz
[BP-L] [BP-H]
Adjustment range on the Bandpass Filter
Crossover Frequency

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
11-EN
EN
FR
ES
About Power Indicator
Power Indicator
Lights up when power is on.
Is off when power is off.
Indication color Status Solution
Blue Amplifier circuit is normal.
Red
(blinking)
Operating temperature is
high.
Turn down the volume of the head unit (input
signal).
Decrease the vehicle’s interior temperature to a
normal level.
The indicator color changes to blue.
Red Amplifier circuit is abnormal.
An electrical short has
occurred, or supply current is
too high.
Turn off the power supply and eliminate the cause.
Then turn on the unit and verify that the indicator
color has changed to blue.
If it remains red, turn off the unit and consult your
dealer.
Operating temperature is too
high.
Decrease the vehicle’s interior temperature to a
normal level.
The indicator color changes to blue.
Power supply voltage is too
high.
Use the correct power supply voltage.
The indicator color changes to blue.
range
6 kHz
]
t
er

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
12-EN
4 Spe
a
When u
s
Input C
h
Selecto
(CHAN
N
* If the c
o
you ca
n
conne
c
• For th
e
excee
d
specifi
c
SYSTEM DIAGRAMS
Before making a connection, check the total number of impedance of the speaker connected to the unit. If
you have any questions, contact the nearest Alpine dealer.
Basic Connection Diagram
Power Supply Terminal
Fuse
RCA Input Jacks
Speaker Output Terminals
Battery Lead (sold separately)
Remote Turn-On Lead (sold separately)
Ground Lead (sold separately)
Head Unit, etc.
Front Output
Rear Output
Subwoofer Output
Front Speakers (Full range)
Rear Speaker (Full range)
Subwoofer
Dual Voice Coil Subwoofer
RCA Extension Cable (sold separately)
Speaker-RCA Conversion Cable (sold separately)
Y-Adapter (sold separately)
Front Speakers (Tweeter)
Front Speakers (Midrange)
Front Speakers (Woofer)

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
13-EN
EN
FR
ES
4 Speaker + Subwoofer System
When using the 4 Speaker + Subwoofer System, set each switch as follows.
Input Channel
Selector Switch
(CHANNEL-3/4)
Input Channel
Selector Switch
(CHANNEL-5/6)
Crossover Mode
Selector Switch
(CHANNEL-1/2)
Crossover Mode
Selector Switch
(CHANNEL-3/4)
Crossover Mode
Selector Switch
(CHANNEL-5/6)
3/4 5/6 OFF OFF LP
[LO]
Head Unit, etc.
Series connection Parallel connection
Dual Voice Coil Subwoofer System
Remote Turn-On Lead
Speaker Input Level Switch
* If the connected head unit does not have a Speaker Output and RCA Extension Cable ( ) cannot be used,
you can use the Speaker-RCA Conversion Cable ( ) (sold separately). For details on how to make a
connection, see “About Connecting to the Speaker Input Level System”(page 18).
• For the 2 Subwoofer System/Dual Voice Coil Subwoofer System, make sure that the minimum impedance
exceeds 2 Ω in total. In addition, the Power Output listed in the SPECIFICATIONS (page 20) is the
specification with the total impedance value.
e
unit. If
p
arately)

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
14-EN
2 Speaker + Subwoofer System (Bridged Connections)
When using the 2 Speaker + Subwoofer System (Bridged Connections), set each switch as follows.
Input Channel
Selector Switch
(CHANNEL-3/4)
Input Channel
Selector Switch
(CHANNEL-5/6)
Crossover Mode
Selector Switch
(CHANNEL-1/2)
Crossover Mode
Selector Switch
(CHANNEL-3/4)
Crossover Mode
Selector Switch
(CHANNEL-5/6)
1/2 5/6 OFF OFF LP
[LO]
Head Unit, etc.
Remote Turn-On Lead
Speaker Input Level Switch
Front
3
When u
s
Input C
h
Selecto
(CHAN
N

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
15-EN
EN
FR
ES
ode
tch
5
/6)
LP
Front 3-Way System
When using the Front 3-Way System, set each switch as follows.
Input Channel
Selector Switch
(CHANNEL-3/4)
Input Channel
Selector Switch
(CHANNEL-5/6)
Crossover Mode
Selector Switch
(CHANNEL-1/2)
Crossover Mode
Selector Switch
(CHANNEL-3/4)
Crossover Mode
Selector Switch
(CHANNEL-5/6)
1/2 1/2 HP-H BP LP
[LO]
Head Unit, etc.
Remote Turn-On Lead
Speaker Input Level Switch

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
16-EN
Front 2-Way + Subwoofer System
When using the Front 2-Way + Subwoofer System, set each switch as follows.
Input Channel
Selector Switch
(CHANNEL-3/4)
Input Channel
Selector Switch
(CHANNEL-5/6)
Crossover Mode
Selector Switch
(CHANNEL-1/2)
Crossover Mode
Selector Switch
(CHANNEL-3/4)
Crossover Mode
Selector Switch
(CHANNEL-5/6)
1/2 5/6 HP-H BP LP
[LO]
Head Unit, etc.
Remote Turn-On Lead
Speaker Input Level Switch
Front
3
R-A75
M
When u
s
Input C
h
Selecto
(CHAN
N

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
17-EN
EN
FR
ES
ode
tch
5
/6)
LP
Front 3-Way + Subwoofer / 2 Amplifier System (Connection example with
R-A75M)
When using the Front 3-Way + Subwoofer / 2 Amplifier System, set each switch as follows.
Input Channel
Selector Switch
(CHANNEL-3/4)
Input Channel
Selector Switch
(CHANNEL-5/6)
Crossover Mode
Selector Switch
(CHANNEL-1/2)
Crossover Mode
Selector Switch
(CHANNEL-3/4)
Crossover Mode
Selector Switch
(CHANNEL-5/6)
1/2 1/2 HP-H BP LP
R-A90S
[LO]
[LO]
Head Unit, etc.
R-A75M
Remote Turn-On Lead
Speaker Input Level Switch
Speaker Input Level Switch

ALPINE R-A90S 68-35792Z94-A (EN/FR/ES)
18-EN
About Connecting to the Speaker Input Level System
When connecting by using the Speaker-RCA Conversion Cable ( ) (sold separately), switch the Speaker
Input Level Switch ( ) to“HI”.
Speaker Input Level Switch RCA Input Jacks
[HI]
Front Speaker output lead (L)
Head Unit, etc.
Rear Speaker output lead (R)
Subwoofer output lead (R)
Front Speaker output lead (R)
Rear Speaker output lead (L)
Subwoofer output lead (L)
• Do not mistake the Speaker Output Lead on the head unit side connected to this unit.
Front Speaker output (L)/(R) to CH1/CH2, Rear Speaker output (L)/(R) to CH3/CH4, Subwoofer output (L)/
(R) to CH5/CH6
• For the“Speaker Input Level System”setting, connecting the Remote Turn-On Lead is not required due to
the“REMOTE SENSING”function of this product. However, the“REMOTE SENSING”function may not work
depending on the signal source connected. In such a case, connect the Remote Turn-On Lead to an
incoming power supply cord (accessory power) in the ACC position.
Important Tips on Bridging an Amplifier
Low output will result if only one channel input is used. The Y-adapter is not required if a stereo/mono pair
line output is used to drive both inputs of the bridged amp.
Proper connection
One signal
Head Unit, etc. Head Unit, etc.
One signal
Improper connection
Cau
t
Use the
s
length.
For deta
i
and the
f
Conne
• When
t
Wire
s
• Extern
a
Equa
l
Ampl
Conne
and o
n
• When
t
Wire
s
• When
t
Wire
s
• Extern
a
install
e
80 A
+
(e.g.
8
Ampl
Ampl
Ampl
(e.g.
8
(e.g.
9
NOTE:
• If the l
e
distrib
u