Walker WS-903 User manual

OWNER'S MANUAL
Please read this manual to maximize your enjoyment
of the outstanding performance and feature capabilities
of the equipment, then retain the manual for future
reference.
WS-903
1
ENGLISH
Introduction:
Please read this OWNER'S V.WALKER thoroughly to familiarize yourself with each control and function. We at
V.WALKER hope that your new WS-903 will give you many years of listening enjoyment.
In case of problems when installing your WS-903, please contact your authorized dealer.
CAUTION: These controls are for tuning your system. Please consult your authorized Dealer for
adjustment.
WARNING This symbol means important instructions.
Failure to heed them can result in serious injury or death.
CAUTION This symbol means important instructions.
Failure to heed them can result in injury or property damages.
WARNING
• 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 VEHICLES 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 OR WIRING 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.
• 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 BOLTS OR SCREWS OUT OF THE REACH OF CHILDREN. Swallowing
them may result in serious injury. If swallowed, consult a physician immediately.
9

ＡＣＣＥＳＳＯＲＩＥＳ
• Bracket ...........................................................................................................................................................4
• Brackets screws...........................................................................................................................................................8
• Fuse(20A) ...........................................................................................................................................................1
• Insert power cable ................................................................................................................................................1
• Remote control ..........................................................................................................................................................1
• Screws ........................................................................................................................................................8
2 3
◆
◆
CAUTION
• 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 dealer or the nearest 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.
For Customers in other Countries
IMPORTANT NOTICE
Customers who purchase the product with which this
notice is packaged, and who make this purchase in
other countries , please contact your dealer for
regarding warranty coverage.
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.
information
NOTE:
• For product improvement, specifications and design are subject to change without notice.
INSTALLATION (Fig. 1) & (Fig. 2)
CAUTION
◆Caution on connection terminals/parts
• Keep electrically conductive objects away from the unit’s terminals/parts (power terminals, fuses, speaker input
terminals, RCA connectors, etc.). Doing so prevents a possible short circuit and damage to the unit.
MOUNTING
1. Attach the included mounting brackets to the WS-903 with the supplied screws. (See to Fig. 1)
2. Once the brackets are mounted to the WS-903. Place the subwoofer in the desired location within the
vehicle. Before securing with screws, check to make sure all screws can affix to a structurally solid surface
while avoiding vehicle wiring, components, etc. (See Fig. 2)
Note: For securing the mounting brackets to the vehicle, it may be necessary to use longer screws (not
included) to accommodate carpet thickness, etc.
NOTE:
• To securelyconnectthegroundlead, use an alreadyinstalledscrewon themetalpart of thevehicle(marked
thisis a goodgroundby checkingcontinuitytothebattery(–) terminal.As muchas possibleconnectall equipment
samegroundpoint.Theseprocedureswill helpeliminatenoise.
SPECIFICATIONS
Sound
Power Output (RMS) 250 watts
Frequency Response 36~ 350Hz
Woofer
Diaphragm Size (Nominal) 23cm x 20cm(9" x 8") Subwoofer + 18cm x 5cm(7" x 2”) Passive subwoofer X 2
Diaphragm Material Polypropylene
Surround Rubber
Amplifier
Power Output (MAX) 1000 watts
Low Pass Crossover 50~ 150 Hz
Input Sensitivity 0.1V (RCA Input)
>2V (Speaker Level Input)
Accessories
Remote Knob Cable length: 5M
Adjustment Range: 0 to -20dB
1Mounting Bracket
2Bracket Screws
3Attachment Method Of Remote Bass Level Knob
3
Fig. 1 Fig. 2
1
2
1

4 5
(L) (R)
F Head Unit, etc (sold separately
)
G RCA ExtensionCable (sold separately
)
F
G
NOT USED
Front Left Speaker (White (+))
Front Left Speaker (White/Black (-))
FUSE 20 A
Front Right Speaker (Gray (+))
Front Right Speaker (Gray/Black (-))
Remote Turn-On Lead (Blue/White)
Battery Lead (Red )
Ground Lead (Black)
4
8
12
36
7
Note:
Power Mode
buttonmust
besetto REM
(Button Out)
RCA Input System
CONNECTIONS (Fig. 3)
Before making connections, be sure to turn the power off to all
audio components. Connect the red battery lead from the amp
directly to the positive (+) terminal of the vehicle's battery. Do
not connect this lead to the fuse block.
CAUTION
◆Caution on connection terminals/parts
• Keep electrically conductive objects away from the unit’s
terminals/parts (power terminals, fuses, speaker output
terminals, RCA connectors, etc.). Doing so prevents a
possible short circuit and damage to the unit.
To prevent external noise from entering the audio system.
• Locate the unit and route the leads at least 10 cm (3-
15/16") away from the car 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 car
chassis.
• Your dealer knows best about noise prevention
measures so consult your dealer for further information.
1Input/Power Connector
2RCA Input Jacks
Connect these jacks to the line out leads on your headunit
using RCA extension cables (sold separately).
1
2
Note: Connectto
eachspeaker
lead(splice) without
breakingthe
connection
between
theheadunitand
thespeaker.
Note: Connectto eachspeaker
lead(splice) withoutbreakingthe
connectionbetweentheheadunitand
thespeaker.
Speaker level input system
FUSE 20 A
4
8
36
7
5
F
H
Left Speake
rRight Speake r
H
Front Left Speaker(White (+))
Front Left Speaker(White/Black(-))
Front Right Speaker (Gray (+))
Front Right Speaker (Gray/Black (-))
Remote Turn-On Lead (Blue/White)
Battery Lead (Red )
Ground Lead (Black)
Not USED
3Fuse (20A)
USE ONLY THE CORRECT AMPERE RATING WHEN
REPLACING FUSES.
Failure to do so may result in fire or electric shock.
4Input/Power Wire Harness
5Speaker Input Leads
These leads are input leads for use with head units not
equipped with preamp outputs. When not using the RCA
Line Input connectors, you should connect these wires to
the speaker output leads of your head unit. The WS-903
accepts input from high power or standard power head
units.
Note:
• Do notconnectspeakerleadstogetheror to chassisground.
• Use eitherRCA line level or speakerlevelinputs.Do notconnect
bothat thesametime.
6Battery Lead (Red)
Connect battery lead directly to BATT +
Be sure to add a 20A fuse (sold separately) as close as
possible to the battery’s (+) terminal.
7Remote Turn-On Lead (Blue/White)
Connect this lead to the remote turn-on (positive trigger,
(+) 12V only) lead of your head unit.
Note:
• If usingspeakerinputlevelsignalfromtheheadunit,remote
turn-onleadconnectionis notnecessary.
8Ground 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.

6
WS-903
7
WS-903 Right end panel
WS-903 connection panel
13
12
9 10 11
13
Fig. 4
Fig. 5
SWITCH SETTINGS (Fig. 4)
9Phase switch 0° to 180°
Subwoofer output phase can be set to Subwoofer Normal
0° (Button Out) or Subwoofer Reverse 180° (Button In).
10 Crossover Frequency Adjustment Knob (LP FILTER)
Use this control to adjust the crossover frequency between
50 to 150Hz.
11 Input Gain Adjustment Control
Note: If the Remote Bass Level Knob will be connected in
your system, make sure to rotate the knob fully clockwise
(set to“+”) before making the input gain adjustment.
Set the WS-903 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.
12 Power Indicator
13 Remote Gain Adjustment Input
Remote Gain Adjustment Knob
Allows the user to adjust the overall bass level of the
subwoofer.
Turning the remote bass level knob towards (+) increases
the overall subwoofer level, while turning the bass level
knob towards (-) decreases the overall subwoofer level.
(Note:
WS-903 can be used without connecting the
remote bass level knob. However, overall subwoofer level
cannot be adjusted from the listening position.)
CONNECTION CHECKLIST (Fig. 5)
Please check your head unit for the conditions listed
below: (Fig. 4)
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
WS-903 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
WS-903 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
WS-903 turn-on lead. This switch will
then be used to turn on (and off) the
WS-903 . 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 subwoofer will remain on and drain the
battery.
1Blue/White
2Power Antenna
3Remote Turn-On Lead
4To other components' Remote Turn-On Leads
5SPST Switch (optional)
6Fuse (3A)
7As close as possible to the vehicle's ignition tap
8Ignition Source
Indication Color Status Solution
Blue Amplifier circuit is
normal
None
(LED is off)
Amplifier circuit
is abnormal. An
electrical short has
occurred, or supply
current is too high.
20A fuse may be
blown.
Turn off the power supply
and eliminate the
cause (replace
the 20A if
necessary). Then
turn on the unit
and verify that the
LED has turned
on. If it remains
off, turn off the
unit and consult
your dealer.
Power supply
voltage is too high.
Use the correct
power supply voltage.