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S YNTHESIS ® F OUR S4VC, S4HC & S4Ai F LUSH -M OUNT L OUDSPEAKERS O WNER ’ S AND I NST ALLER ’ S M ANUAL.
I NTRODUCTION ......................................................................................................................................................3 I NCLUDED ...........................................................................
Thank you for purchasing JBL Synthesis ® Four flush-mount home theater loudspeakers. These products represent the synthesis of everything that JBL ® has learned about the emotional power of audio and video in more than fifty years of preeminence in the field.
or or 4 One S4HC horizontal channel flush-mount loudspeaker One S4VC vertical channel flush-mount loudspeaker One S4Ai multipole ambient flush-mount loudspeaker Four mounting L-brackets with eight 1/4.
Positioning your loudspeakers properly is critical in order to achieve the sonic performance of a home theater . Please read the following section and the “Fine-T uning Y our Audio System” section for guidance in correct and optimal placement.
N OTE : It is extremely important to place the tweeter/mid-bass arrays for each of the center , left and right speakers at the same height. The EOS waveguide containing the tweeter in the center channel speaker should be no more than two feet higher or lower than those in the left and right speakers.
7.1-C HANNEL S YSTEMS In a 7.1-channel system, two speakers are added for rear fill, in addition to the sur- round speakers in a 5.1-channel system. The two additional speakers are placed on the rear wall or near the rear wall in the ceiling (see Figure 6).
W HICH D IFFUSE M ODE I S THE R IGHT O NE FOR THE J OB ? D IPOLE M ODE I S T YPICALL Y U SED W HEN : • The speaker is located relatively close to the listening position.
In a 7.1-channel system, where two additional S4Ai speakers may be mounted in the rear wall, the positive phase arrays for all speakers should fire toward the rear corners, as shown in Figure 11.
S4Ai D U AL -D R IVE M O DE As the S4Ai has the capability of producing both side and rear fields from a single location in Bipole mode while dual- drive n for cinema playback (see S4Ai Wiring Guide on page 7), some care must be taken when using the Direct-Radiating mode with the autoswitching trigger for music playback.
surface, the speaker must be recessed in the wall no more than 1/4 inch. The grille pins fit directly into the speaker cabinet via receiver bushings with 15 ft/lb of tension per pin.
12 R E QUIREMENTS FOR M O UNTING O PTION 2–R ETROFIT /P REEXISTING C ONSTRUCTION : Use the S4RFB bracket. Mount the S4RFB to the wall surface and secure it to studs behind the wall. Attach the speaker via mounting flanges to the appropriate recessed distance.
13 T o connect the Synthesis Four loudspeakers to the power amplifiers or receiver , use two-conductor insulated speaker wire. We recommend #14 A WG wire as a minimum size. Y our JBL dealer can recommend suitable cables. Both the S4VC and S4HC utilize push-style friction binding posts that can accommodate up to #10 AWG stranded wire.
14 A COUSTICAL P ROBLEMS IN L ISTENING R OOMS 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.
15 However , since it is not possible to “toe-in” flush-mounted speakers, the next step is the strategic placement of absorptive materials on the side walls. These range from commercially avail- able fiberglass and dense foam to heavy draperies and even large, overstuffed furniture.
16 The best arrangement of the absorptive and nonabsorptive surfaces in the room can be seen in Figure 24. Most of the room surfaces are relatively absorptive, with the notable exception of the rear wall and the highest portions of the other walls, which should be diffusive.
17 6 degrees and having the ceiling rise toward the rear of the room at a comparable rate will do wonders for the room’ s acoustics, if the wall design is solid and the angles are clearly intentional from the outset.
18 B A CKGROUND -N O ISE S O LUTIONS Many sources of noise in a home environment can be addressed simply . Locating the home theater in the basement often remov es it f rom man y house hold no ises as well a s isolating it from other family members.
19 S T ANDING -W A VE S O LUTIONS : R OOM R A TIOS In new construction, the best way to minimize the audibility of standing waves is to plan for an even distribution of them, so that their effects do not “pile up” on top of each other . In this regard, the ratios of room dimensions are the critical factor .
20 Standing-wave energy tends to be concentrated in the corners of rooms, which is why placing a subwoofer in the cor- ner tends to increase its bass output. Because of this, it is possible to break standing waves up somewhat by “break- ing up” the corner .
21 S Y MPTOM P R OBABLE C A USE S O LUTION No sound coming • Amplifier not turned on • Turn on amplifier. from speaker • Amplifier gain is low • Make sure that there is a mplifier gain for that channel. • Correct source not • Select proper source.
22 S YMPTOM P ROBABLE C AUSE S OLUTION Bass is very weak • Subwoofers are wired out • Make sure that positive terminals on the of phase subwoofers go to the positive terminals on the amplifiers (red) and do the same for the negatives. • Subwoofers have not • Experiment with different locations.
S PECIFICA TIONS 23 M O DEL # S4VC S4HC S4Ai D escription 3 -Way 8" (200mm) vertical 3-Way dual 6-1/2" (165mm) Configurable-array flush- flush-mount speaker horizontal flush-mount speaker mo.
JBL Consumer Products 250 Crossways Park Drive Woodbury, NY 11797 8500 Balboa Boulevard Northridge, CA 91329 818.830.8757 www.jblsynthesis.com Part No.
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