G Series Manual.qXp

7/27/98 12:54 PM

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INTRODUCTION
Congratulations on choosing JBL 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 performance.
G SERIES LOUDSPEAKERS OWNERS MANUAL

PLACEMENT

For the best stereo reproduction, the two loudspeaker systems should be placed 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 loudspeaker in a corner or against a wall will result in the strongest (but not necessarily the most accurate) bass. If possible, G models that are ported on the back should not be placed closer than 12 inches (305 mm) from the wall behind it. For the best stereo imaging, we recommend that the systems be placed so that the high frequency transducers are positioned approximately at ear level of a seated listener. Thats why smaller loudspeakers will benet from placement on stands or bookshelves. Every room is different and there are different tastes. So dont hesitate to experiment on your own.

400 500

Fig. 1

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Thanks to their high efciency, JBL loudspeakers will produce reasonable volume levels in a room of moderate size with very little amplier power. However, using a small amplier to obtain the desired volume listening levels may lead to overdriving the unit. This will generate high distortion levels and may cause damage to your loudspeaker. For the best performance, an amplier 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 amplier will not attempt to deliver more power than its design allows. However, the power ampliers power rating per channel must not exceed the maximum recommended amplier power for that specic loudspeaker model. Please see the specications section for details. Following these two guidelines will provide virtually distortion-free sound reproduction and long loudspeaker life.
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 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 a difference which of the two conductors of wire go to (+) and () on the speakers and amplier, as long as both speakers are connected identically. Push down on the button below the terminal and insert the wire, or the banana plug, through the hole (see Fig. 2).

Left Speaker

Red Blk. (+) ()

Right Speaker

CONNECTIONS
To connect your JBL loudspeaker systems to a receiver or an amplier, use two-conductor insulated wire. Your JBL dealer can recommend suitable cables, or you can buy wire at most hardware stores. We recommend #16 AWG wire as a minimum size. If your speakers are more than 30 feet (10 m) from your receiver or amplier, 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.

Amplifier/ Receiver

+ L + R

Fig. 2

Preparing the hookup wire 1. First determine the distance between the most distant speaker. 2. Now make the hookup wires for both speakers this length, even if one loudspeaker is much closer to your amplier than the other. This will help maintain proper signal balance.

For each channel, the red terminal on the loudspeaker should be connected to the red or (+) loudspeaker connection terminal on the receiver or amplier, and the black to the black or (). 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.

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G SERIES LOUDSPEAKERS

TROUBLESHOOTING

The vast majority of new speaker malfunctions end up being traced to connections or switch settings. Check the following tips rst, 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. No sound from one speaker 1. Balance control turned all the way left or right. 2. Speaker wire has become disconnected. Both speakers play at low volume but shut 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 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 experiencing problems, consult your JBL dealer.

GENERAL CARE

The grille is held in place by pins near the edges (except G40, which has a non-removable grille). To remove the grille, grasp it by both top and bottom edges and pull gently. To replace grille, 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, call 800-336-4JBL for your nearest warranty station. Do not return products to the JBL factory without prior authorization.

Specications

High Frequency Transducer Low Frequency Transducer Crossover Frequency Frequency Response (6 dB) Sensitivity (1 Watt /1 Meter) Nominal Impedance Power Handling Range External Dimensions (H X W X D) Weight (each)
2" ber cone 5" 2.2 kHz 75 Hz 20 kHz 86 dB 8 Ohms Watts 11 x 6-1/2 x 7-1/4" 280 x 165 x 184 mm 7 lbs / 3.2 kg

14 mm 5" 3 kHz 70 Hz 20 kHz 87 dB 6 Ohms Watts 12-3/16 x 7-1/8 x 8-3/4" 310 x 181 x 222 mm 8 lbs / 3.6 kg
1" 6-1/2" 3 kHz 55 Hz 20 kHz 88 dB 6 Ohms Watts 15 x 9-1/4 x 8-13/16" 381 x 235 x 224 mm 12.1 lbs / 5.5 kg

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High Frequency Transducer Midrange Transducer Low Frequency Transducer Crossover Frequency Frequency Response (6 dB) Sensitivity (1 Watt /1 meter) Nominal Impedance Power Handling Range External Dimensions (H x W x D) Weight (each)
1" 5" 8" 600 Hz/3.5 kHz 50 Hz 20 kHz 89 dB 8 Ohms Watts 21-1/4 x 10-3/4 x 10-1/2" 540 x 272 x 267 mm 20 lbs/9.1 kg
14 mm 5" 10" 800 Hz/4.5 kHz 35 Hz 20 kHz 91 dB 8 Ohms Watts 34-1/2 x 13 x 11-3/4" 876 x 330 x 298 mm 36 lbs/16.3 kg
1" 5" (2) 8" 600 Hz/3.5 kHz 42 Hz 20 kHz 89 dB 6 Ohms Watts 37-7/8 x 10-5/8 x 12-3/4" 960 x 270 x 323 mm 36.3 lbs/16.5 kg
JBL continually strives to improve its products. New materials, production methods and design renements 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 specications and descriptions, but will always equal or exceed the original specications unless otherwise stated.
JBL Consumer Products, Inc. 80 Crossways Park West Woodbury, NY Balboa Blvd. Northridge, CA 336 4JBL (4525)
A Harman International Company Part No. 75993 Rev B G40 Manual
Declaration of Conformity
We, JBL Europe A/S Kongevejen 194B DK-3460 Birkerd DENMARK declare in own responsibility, that the products described in this owners manual are in compliance with technical standards: EN 50 081-1/1992 EN 50 082-1/3.1995
Steen Michaelsen JBL Europe A/S Birkerd. DENMARK. 2/96