JBL SC305 owner manual Power Handling, Troubleshooting

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 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).

Center	Blk Red
	(-) (+)
Speaker
	• •

AV Receiver

•• Center (-) (+)

Fig. 3

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 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.

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. 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.

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.

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.

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.

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.

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