JBL CFSERIES User Manual

CF SERIES

LOUDSPEAKERS

OWNER’S

MANUAL

CF

SERIES

INTRODUCTION

Congratulations on choosing JBL
CF Series Loudspeakers. Their high
efficiency and bass response will greatly
increase your enjoyment of recorded
music. JBL speakers are built with careful
attention to detail, using only the highest
quality materials. They will provide many
years of excellent performance.

Your CF Series Loudspeakers are very
easy to set up. We recommend that you
take a few minutes to read this owner's
manual before you begin, and follow the
instructions carefully.

ENGINEERING FEATURES

1.

High Efficiency.

receivers will be able to produce acoustic
levels normally associated with amplifiers
of substantially higher power ratings.

2.

Cast Frame Woofer.

cast woofer frame offers more rigidity
than a stamped steel frame. The stronger
frame provides a solid foundation for the
magnet assembly and cone & coil result­ing in a more linear woofer movement
and less distortion. With the aluminum
frame there is no loss of flux from the
magnet assembly (as is the case with
steel frames) allowing the voice coil to
receive the full strength of the magnetic
field.

3.

Titanium Laminate Tweeter.

duces high-frequency sound waves with
accuracy, bringing out clarity and realism.

4.

Tuned Port Bass Design.

frequency response, reduces distortion
and improves power handling capacity.

PLACEMENT

For the best stereo reproduction, the two
loudspeaker systems should be an equal
distance from your listening position and
separated so that the angle between
them, at the listening position, is between
40 and 60 degrees (see Fig. 1). For
example, if your listening position is 8 to
12 feet (2.5 to 4 m) from each speaker,
the two systems should be about 8 feet
(2.5 m) apart. Placing the loudspeakers in
corners or against a wall will result in the
strongest (not necessarily the most
accurate) bass. The CF80 is ported on
the front to allow placement directly up
against a bookshelf or wall. Since the
other CF Series models are ported on the
back panel, do not place these speakers
closer than 12 inches (305 mm) to the
wall behind it if possible.

Modest amplifiers or

The aluminum die

Repro-

Extends low-

Left
Speaker

Amplifier/Receiver

Right
Speaker

Red Blk.

(+)

++

(–)

RedRLBlk.

(+) (–)

40°-60°

Fig. 1

CONNECTIONS

To connect the loudspeaker systems to
the receiver or amplifier, use two-conduc­tor insulated wire. Your JBL dealer can
recommend suitable cables, or you can
buy wire at most hardware or electronic
stores. We recommend #16 AWG wire as
a minimum size. If your speakers are more
than 30 feet (10 m) from your receiver or
amplifier, use larger diameter wire.
Connections are made at the terminals
located on the back of the loudspeaker
system. The terminals accept bare wire or
dual banana plugs, either of which will pro­vide easy, secure connections.

yarn in one conductor; thin, raised ribs on
one part of the outer insulation; or a printed
"+" marking on one of the insulators. It
does not make any difference which of the
two strands of wire go to (+) and (–) on the
speakers and amplifier, as long as both
speakers are connected identically. If using
wire ends, unscrew the colored nut on the
terminal cup, insert the wire end into the
hole in the metal post, then retighten the
nut until the wire is tightly secured. If using
banana plugs, simply insert the plug
directly into the holes on the top of the
metal posts.

For each channel, the red terminal on the
loudspeaker should be connected to the
red or (+) loudspeaker connection terminal
on the receiver or amplifier, and the black
to the black or (–) speaker connection ter­minal (see Fig. 2). Connecting the loud­speakers in this manner ensures that they
will be in phase; that is, work together
rather than in opposition. Connecting the
loudspeakers out of phase will not dam­age them, but will result in less bass and
poor imaging.

Preparing the hookup wire

Carefully plan your wire lengths before
cutting any speaker wire. Be sure to
allow plenty of extra wire to help hide
paths in corners, along baseboards, etc.

1. First determine the wire length needed
between the most distant speaker and the
receiver or amplifier.

2. Now make the hookup wires for both
speakers this length, even if one loud­speaker is much closer to your amplifier
than the other. This will help maintain
proper signal balance.

3. Strip off 3/8" of insulation from both
ends of each conductor.

4. Twist each set of thin wires into a
tightly-bunched spiral.

5. At this point you need to identify a visual
difference between the two conductors of
each molded pair of speaker wire.
Differentiating marks can be a different
color wire (copper or "silver"); a strand of

Hooking up multiple sets of speakers

If your receiver has two complete sets of
speaker terminals ("A" and "B"), it's possi­ble to hook up an additional pair of speak­ers for

simultaneous

sound in another
room. However, some speakers may not
be usable as a second pair if you want
to play two sets at once. Before hooking
up another set of speakers besides your
CF Series, check the following:

2

Fig. 2

CF SERIES LOUDSPEAKERS

1. Your receiver or amplifier minimum load
impedance. Impedance is always expressed
in ohms and can be found in the owner's
manual that came with your unit. For
example, the following are typical entries
in receiver/amplifier owner's manuals:

A. 100 watts RMS into 8 ohms, both
channels driven, 20 – 20kHz with less
than 0.02%THD
B. 160 watts RMS into 4 ohms, both
channels driven, 20 – 20kHz with less
than 0.02% THD.

2. The nominal impedance of the sec­ond set of speakers. A pair of CF Series
speakers when combined with another
pair of 8-ohm speakers will present an
impedance to the receiver/amplifier that is
approximately 4 ohms. This speaker com­bination can be used with the receiver/
amplifier cited in B above. If the receiver/
amplifier has a specification similar to that
shown in A above, or if your second set of
speakers has an impedance other than
8 ohms, you must consult the receiver/
amplifier manufacturer for clarification.

POWER HANDLING

Thanks to their high efficiency, JBL
CF Series loudspeakers will produce
reasonable volume levels in a room of
moderate size with very little amplifier
power. However, using a small amplifier to
obtain the desired volume listening levels
may lead to overdriving the amplifier. This
will generate high distortion levels and may
cause damage to your loudspeaker. For
the best performance, an amplifier should
be selected with an output rating that is
greater than the maximum power that will
be used. This margin of reserve power will
ensure that the amplifier will not attempt to
deliver more power than its design allows.
However, the power amplifier's power rat­ing per channel must not exceed the maxi­mum recommended amplifier power for
that specific loudspeaker model. Please
see the specifications section for details.
Following these guidelines will provide
distortion-free sound reproduction and
long loudspeaker life.

TROUBLESHOOTING

Most "malfunctions" end up being traced
to connections or switch settings. To
avoid packing up correctly functioning
speakers and sending them off, only to
find that they're not really at fault, check
the following tips first, before requesting
service.

No sound at all or very faint sound
from both speakers

1. Amp/receiver tape monitor button
pushed in while using CD, FM or phono
inputs.

2. Wrong speaker switch, "A" or "B"
speaker output.

3. Sound source (CD, cassette deck,
turntable) not turned on, not activated,
not hooked up or not selected on
amp/receiver front panel.

4. CF120: Blown fuse (see Fuse
Replacement).

No sound from one speaker

1. Balance control turned all the way left
or right.

2. Speaker wire has become disconnected.

3. One of the connections between sound

source and amp/receiver is faulty or has
become disconnected.

Both speakers play at low volumes
but shut off as volume is increased OR
sound turns on and off intermittently

1. A few strands of speaker wire may be
shorting out. Recheck the connections.

2. More than 1 pair of speakers are
connected to the amp and the total
impedance is too low. Recheck the
minimum impedance requirements of
the amp.

Bass is very weak AND/OR sound
seems to come from each speaker
separately, without creating a stable
stereo image between the speakers.

1. The polarity (+&–) of one speaker has
been reversed relative to the other.
Double check connections.

2. Speakers are too far away from back
and side walls or too far apart.
Experiment again with the speaker
placement. If you are still encountering
problems, consult your JBL dealer.

3

CF SERIES LOUDSPEAKERS

JBL Consumer Products, Inc.
80 Crossways Park West
Woodbury, NY 11797

8500 Balboa Boulevard
Northridge, CA 91329

800 336 4JBL (4525)

A Harman International Company

Part No. 15-30-4142-00

Declaration of Conformity

We, JBL Europe A/S

Kongevejen 194B
DK-3460 Birkerød
DENMARK

declare in own responsibility, that
the products described in this
owner’s manual are in compliance
with technical standards:
EN 50 081-1/1992
EN 50 082-1/3.1995

Steen Michaelsen

JBL Europe A/S

Birkerød. DENMARK. 2/96

FUSE REPLACEMENT

The CF120 & CF150 have fuses which will
protect the speaker from being overpow­ered under normal conditions. Unscrew the
cap labeled "fuse" and replace with a
250V, 5 x 20mm, slow-blow TDS-type fuse:

2.5 Amp for CF120; 3.0 Amp for CF150.

Replacement with any other type fuse
will void your JBL warranty.

GENERAL CARE

The grille is held in place by pins near
the edges. To remove the grille, grasp it
by both top and bottom edges and pull
gently. To replace, reposition it carefully
and press gently at the corners. Do not
push on the center area of the grille.
The loudspeaker cabinet may be cleaned
with a slightly damp cloth. To remove dust
from the grille cloth, use a vacuum with a
brush attachment. Spots may be removed
with a commercial spot remover. Do not
use any cleaners or solvents on the
speaker drivers themselves.

SERVICE

Should your loudspeaker ever need service,
return it to the JBL dealer from whom it
was purchased. If for some reason this is
impractical, in the United States, call
800-336-4JBL for your nearest warranty
station.

Military personnel who purchased from
authorized military outlets should return
them to a similar outlet or contact:

Mohawk Marketing Corp.
149 Business Park Drive
P.O. Box 62229
Virginia Beach, VA 23462
Phone: [phone]
FAX: [phone]

If purchased outside the United States,
contact your local distributor to make
arrangements for repair service. Do not

return products to the JBL factory.

Specifications CF80 CF100 CF120 CF150

Application 2-Way Bookshelf 3-Way Floorstanding 3-Way Floorstanding 3-Way Floorstanding
High Frequency Dome Transducer 14 mm Ti Laminate 14 mm Ti Laminate 14 mm Ti Laminate 25 mm Mylar Laminate
Mid Frequency (Polymer Laminate) n/a 4-1/2" 4-1/2" 6-1/2"
Low Frequency (Polymer Laminate) 8" 10" 12" 15"
Crossover Frequencies 4.5kHz 1400Hz/7kHz 800Hz/7kHz 850Hz/4.5kHz
Frequency Response (– 6dB) 43Hz to 20kHz 39Hz to 20kHz 36Hz to 20kHz 32Hz to 20kHz
Sensitivity (1 watt/1 meter) 92dB 94dB 96dB 98dB
Nominal Impedance 8 Ohms 8 Ohms 8 Ohms 8 Ohms
Recommended Amplifier Power* 10 to 100 watts 10 to 175 watts 10 to 250 watts 10 to 325 watts
External Dimensions (H x W x D) 19-5/8 x 11 x 11-3/8" 27 x 12-13/16 x 11-11/16" 31-1/2 x 16-1/2 x 15" 35 x 17-7/8 x 18-15/16"

Weight (each) 23 lbs (10.4 kg) 32 lbs (14.5 kg) 50 lbs (22.7 kg) 62 lbs (28.1 kg)

*The maximum recommended amplifier power rating will ensure proper system headroom to allow for occasional program

peaks. We do not recommend sustained operation at these maximum power levels.

498 x 279 x 289mm 686 x 325 x 297mm 800 x 420 x 381mm 889 x 454 x 481mm

JBL continually strives to improve its products. New materials, production methods and design refinements are introduced
into existing models without notice as a routine expression of our design philosophy. For this reason, JBL loudspeakers
may differ in some respect from their published specifications and descriptions, but will always equal or exceed the original
specifications unless otherwise stated.