Read JBL SCS 138 SUB (serv.man2) User Guide / Operation Manual online
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1. Unpacking: Check the product carefully. If
it has been damaged in transit, report the da-
mage immediately by calling your dealer
and/or the shipping company that delivered it.
2. Connections: Whenever changing, con-
necting or disconnecting signal or power
cables etc., always turn off all equipment.
This prevents transients from entering the
equipment and prevents electrical energy
from reaching you. Keep all connections out
of the reach of children. Before moving the
unit, be certain to disconnect any intercon-
nection cords with other components, and
make certain that you disconnect any powe-
red units from the AC outlet.
3. Read Instructions. All the safety and opera-
ting instructions should be read before the
product is operated.
4. Retain Instructions. The safety and ope-
rating instructions should be retained for
5. Heed Warnings. All warnings on the pro-
duct and in the operating instructions should
be adhered to.
6. Follow Instructions. All operating and use
instructions should be followed.
7. Water and Moisture. The product should
not be used near water – for example, near a
bathtub, washbowl, kitchen sink, laundry tub,
in a wet basement, or near a swimming pool,
and the like.
8. Accessories. To ensure proper operation
and to avoid the potential for safety hazards,
place the unit on a firm and level surface.
When placing the unit on a shelf, be certain
that the shelf and any mounting hardware
can support the product’s weight. Do not
place this product on an unstable cart, stand,
tripod, bracket, or table. The product may fall,
causing serious injury to a child or adult, and
serious damage to the product. Use only with
a cart, stand, tripod, bracket, or table recom-
mended by the manufacturer, or sold with the
product. Any mounting of the product should
follow the manufacturer’s instructions, and
should use a mounting accessory recom-
mended by the manufacturer.
should be mounted on a wall or ceiling only
when and as recommended by the manu-
10. Cleaning. Unplug this product from the
wall outlet before cleaning. Do not use liquid
cleaners or aerosol cleaners. Use a damp
cloth for cleaning.
11. Attachments. Do not use attachments not
recommended by the product manufacturer,
as they may cause hazards.
12. Replacement Parts. When replacement
parts are required, be sure the service tech-
nician has used replacement parts specified
by the manufacturer or that have the same
characteristics as the original part.
Unauthorized substitutions may result in fire,
electric shock or other hazards.
13. Safety Check. Upon completion of any
service or repairs to this product, ask the
service technician to perform safety checks
to determine that the product is in proper
14. Feet/Spikes. When positioning, or moving
this product ensure that is lifted rather than
dragged across any floor/mounting surface.
This will avoid any damage to the floor/-
mounting surface. Attention! Products and/or
product feet constructed of rubber or plastics
may, in seldom cases, react chemically and
discolor treated or non-treated wooden sur-
faces if positioned without protection.
15. Warranty: The following conditions may
result in a void product warranty:
a. the manufacturers serial number is remo-
by non-authorized personnel or
accessories/supplements are attached,
which are not approved by
covered by the product warranty:
a. Damage caused by inappropriate handling
and plastic parts and fuses) as well as
results of normal wear and tear.
e. Damage caused by excessive electrical
g. Damage known to buyer prior to purchase.
h. Damage caused by professional employ-
for catering trade, restaurants, public ad-
dress or infinite loop announcement use
tions/features are subject to change without
18. Amplifiers: Amplifiers used to drive these
units must deliver a sufficient output power. A
lack of output power may lead to amplifier-
clipping, which causes damage not covered
19. Ventilation. Slots and openings in the
cabinet are provided for ventilation and to
ensure reliable operation of the product and
to protect it from overheating, and these
openings must not be blocked or covered.
The openings should never be blocked by
placing the product on a bed, sofa, rug, or
other similar surface. This product should not
be placed in a built-in installation such as a
bookcase or rack unless proper ventilation is
provided or the manufacturer’s instructions
have been adhered to.
Make certain that the proper space (more
than 10cm) is provided both above and below
the unit for ventilation. If the amplifier will be
installed in a cabinet or other enclosed area,
make certain that there is sufficient air
movement within the cabinet, with means
provided for hot air to exit and for cool air to
be brought in.
Do not obstruct the ventilation slots on the
top of the unit or place objects directly over
them. Remember, power amplifiers generate
heat, and the heatsink fins and ventilation
slots that form part of the cabinet are spe-
cially designed to remove this heat. Placing
other electronic equipment near these heat-
dissipation systems may possibly affect the
long term reliability of both your amplifier and
the objects placed above it.
Do not place CDs, record jackets, owner’s
manuals or other paper on top of or beneath
the unit or in between products containing
amplifiers in a stack. This will block the air
flow, causing degraded performance and a
possible fire hazard.
20. Power Sources. This product should be
operated only from the type of power source
indicated on the marking label. If you are not
sure of the type of power supply to your
home, consult your product dealer or local
power company. For products intended to
operate from battery power, or other sources,
refer to the operating instructions.
21. Grounding or Polarization. This product
may be equipped with a polarized alternating-
current line plug (a plug having one blade
wider than the other). This plug will fit into the
power outlet only one way. This is a safety
feature. If you are unable to insert the plug
fully into the outlet, try reversing the plug. If
the plug should still fail to fit, contact your
electrician to replace your obsolete outlet.
Do not defeat the safety purpose of the
22. Power-Cord Protection. Power-supply
cords should be routed so that they are not
likely to be walked on or pinched by items
placed upon or against them, paying parti-
cular attention to cords at plugs, convenience
receptacles, and the point where they exit
from the product. To avoid safety hazards, use
only the power cord supplied with your unit. If
a replacement cord is used, make certain that
it is of a similar gauge. We do not recommend
using extension cords with this product. As
with all electrical devices, do not run power
cords under rugs or carpets or place heavy
objects on power cords. Damaged power
cords should be replaced immediately, by a
qualified service technician, with cords
meeting factory specifications. When
disconnecting the power cord from an AC
outlet, always pull the plug; never pull the
symbol, within an equilateral triangle, is
intended to alert the user to the
presence of uninsulated “dangerous
voltage” within the product’s enclosure
that may be of sufficient magnitude to
equilateral triangle is intended to alert
the user to the presence of important
operating and maintenance (servicing)
instructions in the literature
accompanying the appliance.
has been involved in every
aspect of music and film
recording and reproduction,
from live performances to the
recordings you play in your
home, car or office.
system you have chosen will
provide every note of enjoment
that you expected – and that
when you think about
purchasing additional audio
or office, you will once again
reproduced by the subwoofer
is mostly omnidirectional, and
this speaker may be placed in a
convenient location in the
room. However, the best repro-
duction of bass will be heard
when the subwoofer is placed
in a corner along the same wall
Experiment with subwoofer
placement by temporarily
placing the subwoofer in the
listening position and moving
around the room until the bass
reproduction is best. Place the
subwoofer in that location.
manufacturers of speakers and
electronics, including JBL, use
red to denote the (+) terminal
and black for the (–) terminal.
It is important to connect both
speakers identically: (+) on the
speaker to (+) on the amplifier
and (–) on the speaker to (–) on
the amplifier. Wiring “out of
phase” results in thin sound,
weak bass and a poor stereo
systems, connecting all of the
speakers in your system with
the correct polarity remains
equally important in order to
preserve the proper ambience
and directionality of the
the speaker wire as shown.
Speakers and electronics
terminals have corresponding
the product should be unplugged from the
outlet when left unused for long periods of
24. Lightning. For added protection for this
product during a lightning storm, or when it
is left unattended and unused for long
periods of time, unplug it from the wall
outlet and disconnect the antenna or cable
system. This will prevent damage to the
product due to lightning and power-line
25. Overloading. Do not overload wall out-
lets, extension cords, or integral conven-
ience receptacles, as this can result in a
risk of fire or electric shock.
26. Damage Requiring Service. Unplug this
product from the wall outlet and refer
servicing to qualified service personnel
under the following conditions:
a. The power-supply cord or the plug has
instructions. Adjust only those controls
that are covered by the operating
instructions, as an improper adjustment
of other controls may result in damage
and will often require extensive work by
a qualified technician to restore the
product to its normal operation; or
this product yourself, as opening or
removing covers may expose you to
dangerous voltage or other hazards. Refer
all servicing to qualified service personnel.
objects of any kind into this product
through openings, as they may touch
dangerous voltage points or short-out
parts that could result in a fire or electric
shock. Never spill liquid of any kind on the
product. The apparatus shall not be
exposed to dripping or splashing and no
objects filled with liquids, such as vases,
shall be placed on the apparatus.
29. Heat. The product should be situated
away from heat sources such as radiators,
heat registers, stoves or other products
(including amplifiers) that produce heat.
Avoid installation in extremely hot or cold
locations, in an area that is exposed to
direct sunlight or near heating equipment.
When positioning the product in its final
location, make certain that it has adequate
ventilation on all sides, as well as on the
top and bottom.
Dolby Pro Logic applications
(not Dolby Digital, DTS
where the receiver/processor
does not have a subwoofer
output, or a volume-controlled
preamp (line-) level output:
Connect your receiver or
amplifier’s front left and right
speaker terminals to the left
and right terminals on the
subwoofer that are marked
“High Level In.” Connect the
left and right terminals on the
subwoofer that are marked
“High Level Out” to the cor-
responding terminals on the
back of your front left and right
Connect your receiver or
amplifier’s center, left and right
surround speaker terminals to
the corresponding terminals on
the back of your center, left and
right surround speakers.