User manual JBL SYN1

[. . . ] JBL Synthesis Four speaker systems feature the following: ® ® THX ULTRA2 -LICENSED HOME AUDIO SYSTEM: When used with a THX TM controller and amplifiers, your speaker system will deliver a state-of-the-art THX home theater experience to your living room. You will hear in your home exactly what the director and sound engineer heard in the recording studio. The system will reproduce the audio flawlessly and without distortion. ® FLUSH-MOUNT APPEARANCE: The S4Ai, S4VC and S4HC are designed to fit flush to your wall surface. Designers and interior decorators will be pleased by their hidden appearance and stunning performance. PURE-TITANIUM, HIGH-FREQUENCY TRANSDUCER DOME: The pure-titanium diaphragms with neodymium magnet structures are ultralight to accurately reproduce lightning-fast sounds ­ such as cymbal crashes ­ yet extremely rigid to eliminate distortion and ear fatigue. ELLIPTICAL OBLATE SPHEROIDAL (EOS) WAVEGUIDE: First developed for our JBL Professional LSR studio TM monitors, this unique structure enables Synthesis Four Series speakers to evenly disperse high frequencies, creating precise imaging over a wide listening area. PURE-TITANIUM, INVERTED-DOME, MIDRANGE TRANSDUCERS (S4VC, S4HC): The midrange drivers seamlessly complement the titanium-dome tweeter and offer nearly perfect pistonic motion, which eliminates the uncontrollable flexing found in conventional cones. The inverted dome is driven precisely at its center, which cancels resonances inherent in cone materials. [. . . ] In that case, the positive terminal will be colored to correspond to the channel position, while the negative terminal will be black. It is important to connect all speakers identically: (+) on the speaker to (+) on the amplifier and (­) on the speaker to (­) on the amplifier. Wiring "out of phase" results in thin sound, weak bass and poor imaging. With the advent of multichannel surround sound systems, connecting all of the speakers in your system with the correct polarity remains equally important to preserve the proper ambience and directionality of the program material. Now find a visual difference between the two conductors of each molded pair of speaker wires. 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 part of the outer insulation. It doesn't matter which of the two strands go to the (+) and (­) on the speakers and amplifiers, as long as all speakers are connected identically. Push down on the binding post, insert the wire into the hole, and release. 13 FINE-TUNING YOUR AUDIO SYSTEM ACOUSTICAL PROBLEMS IN LISTENING ROOMS A home THX audio system, such as the Synthesis Four system, addresses many of the problems common to high-quality reproduction of music or soundtracks in a home environment. For example, the dispersion pattern of the front LCR speakers minimizes the effects of floor and ceiling reflections. Still, the single most important variable in any sound system is the listening environment. Room reflections create spurious false images and "comb filter" interference effects which alter the tonality of the system while degrading the localization of specific sounds. Place the diffuser where you would otherwise place the absorptive material (using the "mirror trick"), to break up the first early reflections and scatter them randomly throughout the room. Commercially available fiberglass, foam and diffusion panels may not be aesthetically acceptable in many installations, particularly when the home theater room serves multiple purposes. All of these materials can be covered with acoustically transparent cloth for design considerations. It is important that the cloth be acoustically transparent, however, or the effectiveness of the absorptive material will be greatly reduced. The simplest test for this is to hold a large sample of the cloth in front of a speaker playing pink noise. If you can move the cloth in front of the speaker without hearing a difference, the cloth is good for use in this application. Large expanses of glass can be challenging. Glass reflects mids and highs, but often lets bass pass through, almost as if the glass were not there. The result is a characteristically bright, rough sound that can be difficult to correct electronically. The best treatment is generally the heaviest insulated drapes that can be found. (Incidentally, these serve double duty, controlling light that might otherwise fall on the screen. ) The materials just discussed are ineffective at lower frequencies. [. . . ] · Make sure that there is amplifier gain for that channel. · Select proper source. · Correct source not selected or turned on · Defective patch cords to amplifier · Speaker wires not connected to amplifier · Balance control set improperly · Check/replace patch cords. · Check speaker wire connection to amplifier. · Make sure Balance control is set at center, or 12 o'clock, position. [. . . ]