JBL SC305 User Manual

SC305
CENTER CHANNEL
SPEAKER
OWNER’S
MANUAL
SC
INTRODUCTION
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.
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.
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.
305
JBL1044 7/27/98 2:16 PM Page 1

JBL SC305 Specifications

Transducers

High Frequency Dome Transducer	14 mm Titanium Laminate
Low Frequency Transducer	5"(2)

Acoustic Characteristics

Crossover Frequency	2.7 kHz
Frequency Response	100 Hz to 20 kHz
Sensitivity	87 dB
Nominal Impedance	8 ohms

Power

Recommended Amplifier Power	10 to 100 Watts

Weight and Dimensions

External Dimensions (HxWxD)	7" x 20" x 6-1/2"
External Dimensions (millimeters)	178 x 508 x 165
Weight (each)	15 lbs (6.8 kg)
Shipping Weight	18 lbs (8.2 kg)

Summary

Introduction to JBL Series Loudspeakers

SC305 Center Channel Speaker Overview

Details the concentrated effort to combine traditional JBL performance with elegant contemporary appearance.

Smooth, Extended Response Features

Highlights the 14mm Titanium Laminate dome tweeter and dual 5" polymer laminated cone drivers.

High Quality Crossover Network Design

Explains the computer-optimized, third-order crossover sections using high-quality components.

Speaker Placement and Connections

Magnetic Shielding Benefits

Prevents stray magnetic fields from interfering with video picture for direct monitor placement.

Cabinet Design and Placement Options

The multi-angled cabinet offers options for placing the SC305 on top of or in front of the monitor.

Optimal Speaker Placement

Speaker should be located very close to the video monitor, centered with its center line.

Hookup Wire Preparation

Measure speaker distance, cut wires to length, and strip 3/8" insulation from ends.

Wiring, Level Adjustment, and Power

Speaker Wire Connection and Polarity

Connect red to red (+) and black to black (-) for correct phase, ensuring proper bass and imaging.

Center Channel Level Adjustment

Adjust center channel level so sound matches left/right front speakers at listening position.

Power Handling Recommendations

High efficiency allows reasonable volume with little power; avoid overdriving amplifier to prevent distortion/damage.

Troubleshooting and Maintenance

Troubleshooting Common Issues

Check connections and settings first for common 'malfunctions' before requesting service.

No Sound or Faint Sound

Check speaker wire, connections, AV receiver mode, and sound source activation.

Intermittent Sound or Shut-Off

Check for shorted speaker wires or impedance issues with the amplifier.

General Care, Specifications, and Service

General Care Instructions

Instructions for cleaning the cabinet with a damp cloth and the grille with a vacuum brush.

Speaker Specifications

Lists technical details: transducer, crossover frequency, response, sensitivity, impedance, amplifier power, dimensions, weight.

Service and Support Information

Instructions for returning the loudspeaker for service to the dealer or authorized warranty stations.