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.

3

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JBL SC305 owner manual Power Handling
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SC305 specifications

The JBL SC305 is a cutting-edge studio monitor that has quickly gained a reputation for its accurate sound reproduction and impressive technology. Engineered for professional audio applications, the SC305 is ideal for music production, mixing, and mastering environments, providing sound engineers with the tools they need to create high-quality audio.

One of the standout features of the JBL SC305 is its 5-inch woofer, which delivers an outstanding low-frequency response. This woofer is composed of a high-quality polypropylene cone that allows for precise sound reproduction and reduces distortion, ensuring that every note is clear and well-defined. The low-frequency performance is further enhanced by a rear-firing port that provides deeper bass while maintaining high clarity.

The SC305 also features a 1-inch soft dome tweeter that's designed to offer smooth high-frequency response with minimal coloration. The tweeter excels in producing transparent highs and works seamlessly with the woofer to create a balanced soundstage. The integration of these two drivers results in a frequency response that ranges from 48 Hz to 20 kHz, making the SC305 capable of reproducing the full range of sounds found in modern music.

In addition to its excellent audio performance, the JBL SC305 incorporates advanced JBL technologies. The built-in Class D amplifier not only provides plenty of power for clear sound reproduction but also ensures energy efficiency. The speaker’s power handling capability is impressive, allowing it to maintain consistent performance even at higher volumes, which is crucial in professional environments where dynamic range is essential.

The JBL SC305 is also designed with user-friendly controls. It features adjustable bass and treble controls, allowing users to tailor the sound according to their specific environment or personal preference. The speakers are also equipped with XLR and TRS input connectors, which ensure compatibility with a wide range of audio devices.

For those looking for durability, the SC305 comes in a robust enclosure that minimizes vibrations, protecting the internal components and ensuring long-term reliability. Its sleek design also allows it to fit seamlessly into any studio setup, making it a versatile choice for professionals.

Overall, the JBL SC305 combines advanced technology, professional-grade sound, and user-friendly design, making it an essential tool for anyone serious about audio production. From the novice to the experienced sound engineer, the SC305 offers an impressive listening experience that can elevate any audio project.
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