JBL G100 (01) PDF Document

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. 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.

Additionally, for the best stereo imaging, it is recommended that the systems be placed so that the high frequency transducers are positioned approximately at ear level of a seated listener. Smaller loudspeakers will benefit from placement on stands or bookshelves.

Placing the loudspeaker in a corner or against a wall will result in the strongest (but not necessarily the most accurate) bass. However, 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.

JBL loudspeakers are highly efficient and produce reasonable volume levels with little amplifier power. However, using a small amplifier to obtain desired listening levels may overdrive the unit, generating high distortion and potentially damaging the loudspeaker. For best performance, select an amplifier with an output rating greater than the maximum power that will be used. Do not exceed the maximum recommended amplifier power for the specific loudspeaker model.

To connect your loudspeakers to a receiver or amplifier, use two-conductor insulated wire. It is recommended to use #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.

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 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. Identify a visual difference between the two conductors of each molded pair of speaker wire to differentiate polarity (e.g., different color, a strand of yarn, raised ribs, or a “+” marking).

Connections are made at the terminals located on the back of the loudspeaker system. These terminals accept bare wire or dual banana plugs. Push down on the button below the terminal and insert the wire, or the banana plug, through the hole.

For each channel, the red terminal on the loudspeaker should be connected to the red or (+) connection terminal on the receiver or amplifier, and the black terminal on the loudspeaker to the black or (-) terminal on the receiver or amplifier. Connecting the loudspeakers in this manner ensures they will be in phase. Connecting them out of phase will result in less bass and poor imaging.

Check the following potential issues:

1. Ensure the Amp/receiver tape monitor button is not pushed in while using CD, FM, or phono inputs.

2. Verify the correct speaker switch (“A” or “B”) is selected.

3. Make sure the sound source (CD, cassette deck, turntable) is turned on, activated, hooked up, and selected on the amp/receiver front panel.

1. Check if the balance control is turned all the way left or right.

2. Check if the speaker wire has become disconnected.

This may be caused by a few strands of speaker wire shorting out. Recheck the connections. Also, recheck the impedance requirements of the amplifier.

1. The polarity (+ and -) of one speaker may have been reversed relative to the other. Double-check connections.

2. Speakers may be too far away from back and side walls or too far apart. Experiment again with speaker placement.

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.

To remove the grille (on models with removable grilles like the G100), grasp it by both top and bottom edges and pull gently. To replace the grille, reposition it carefully and press gently at the corners. Do not push on the center area of the grille.