JBL Speaker SC305 User Manual

INTRODUCTION  
SC305  
CENTER CHANNEL  
SPEAKER  
Congratulations on choosing JBL  
Series loudspeakers. Their highly  
accurate, uncolored and balanced  
sound character 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 per-  
formance.  
OWNERS  
MANUAL  
The SC305 Center Channel Speaker  
is the result of concentrated efforts to  
combine traditional JBL performance  
values with elegant contemporary  
appearance. Some of the engineer-  
ing features of the SC305 are:  
Smooth, extended response:  
The 14mm Titanium Laminate dome  
tweeter, dual 5" polymer laminated  
cone drivers and carefully designed  
dividing network deliver the clear,  
crisp, quality sound reproduction  
needed to deliver the accurate, intelli-  
gible vocal information required by a  
center channel speaker.  
305  
High Quality Crossover  
Network: the computer-optimized  
dividing network employs up to third-  
order (18 dB per octave) crossover  
sections. JBL's use of high quality  
capacitors and low-loss/low-distortion  
inductors assures freedom from  
phase or amplitude distortions.  
SC  
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4. Twist each set of thin wires into a  
tightly-bunched spiral.  
POWER HANDLING  
Thanks to its high efficiency, the JBL  
SC305 loudspeaker will produce reason-  
able volume levels in a room of moderate  
size with very little amplifier power.  
5. At this point you need to identify a  
visual difference between the two con-  
ductors of each molded pair of speak-  
er wire. Differentiating marks can be a  
different color wire (copper or "silver");  
a strand of 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 identi-  
cally. Push down on the button below  
the terminal and insert the wire, or the  
banana plug, through the hole (see  
Fig. 3).  
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 amplifier's power rating per  
channel must not exceed the maximum  
recommended amplifier power for that spe-  
cific loudspeaker model. Please see the  
specification section for details. Following  
these guidelines will provide virtually distor-  
tion-free sound reproduction and long loud-  
speaker life.  
Blk Red  
Center  
(-) (+)  
Speaker  
• •  
TROUBLESHOOTING  
The vast majority of new speaker "malfunc-  
tions" end up being traced to connections  
or switch settings. Check the following tips  
first, before requesting service.  
AV Receiver  
Center  
• •  
(-) (+)  
Fig. 3  
No sound at all or very faint sound from  
the center channel speaker  
1. Speaker wire has become disconnected.  
2. One of the connections between sound  
source and AV receiver/amp is faulty or  
has become disconnected.  
3. AV receiver/amp center channel mode  
not selected. Please select a mode that  
activates the center channel.  
The red terminal on the loudspeaker  
should be connected to the red or (+)  
center channel connection terminal on  
the AV receiver or amplifier, and the  
black to the black or (-). Connecting  
the loudspeaker in this manner  
4. AV receiver/amp "audio direct" switch is  
activated. This switch should be off to acti-  
vate the 5 speaker surround mode.  
5. Sound source (VDP, VCR,CD,cassette  
deck, turntable) not turned on, not activat-  
ed, not hooked up or not selected on AV  
receiver/amp front panel.  
ensures that it will be in phase; that is,  
work together rather than in opposition  
to the left and right channel speakers.  
Connecting loudspeakers out of phase  
will not damage them, but will result in  
less bass and poor imaging.  
Using the controls on your center  
channel AV receiver/amp, adjust the  
center channel level (volume) control  
so that the sound from the center  
speaker is the same level at your nor-  
mal listening position, as the sound  
from the left and right front speakers.  
Speaker plays at low volumes but shuts  
off as volume is increased OR sound  
turns on and off intermittently  
A few strands of speaker wire may be  
shorting out. Recheck the connections.  
Recheck the impedance of the amp.  
3
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GENERAL CARE  
SERVICE  
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 grille, re-position it carefully and  
press gently at the corners. Do not push on  
the center area of the grille.  
Should your loudspeaker ever need ser-  
vice, 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:  
ALA Associates Enterprises  
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.  
985 Ponce de Leon Avenue  
Atlanta, GA 30306  
Phone: 800-875-4252  
FAX: 404-873-3592  
If purchased outside the United States,  
contact your local distributor to make  
arrangements for repair service. Do not  
return products to the JBL factory with-  
out prior authorization.  
Specifications  
SC305  
High Frequency Dome Transducer  
Low Frequency (High Polymer Laminate)  
Crossover Frequency  
14mm Titanium Laminate  
5"(2)  
2.7 kHz  
Frequency Response (- 6 dB)  
Sensitivity(1 Watt/1 meter)  
Nominal Impedance  
Recommended Amplifier Power*  
External Dimensions (HxWxD)  
External Dimensions (millimeters)  
Weight (each)  
100 Hz to20 kHz  
87 dB  
8 ohms  
10 to 100 Watts  
7"x 20"x 6-1/2"  
178x508x165  
15 lbs (6.8 kg)  
18 lbs (8.2 kg)  
Shipping Weight  
*Undistorted continuous power per channel.  
JBL continually strives to improve its products. New materials, production methods and  
design refinements are introduced into existing models without notice as a routine expres-  
sion 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.  
JBL Consumer Products, Inc.  
240 Crossways Park West  
Woodbury, NY 11797  
8500 Balboa Blvd.  
Northridge, CA 91329  
800 336 4JBL  
Part No. 75993  
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