JBL S4Ai - Manuals

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-Tuning Your Audio System” section for guidance in correct and optimal placement. L EFT AND R IGHT S PEAKERS : If you have purchased a Synthe...

N OTE : It is extremely important to place the tweeter/mid-bass arrays for each of the center, left and right speakers at thesame height. The EOS waveguide containing the tweeter in the center channel speaker should be no more than twofeet higher or lower than those in the left and right speakers. T...

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 onthe rear wall or near the rear wall in the ceiling (see Figure 6). S4Ai M ODES OF O PERATION The S4Ai multipole...

W HICH D IFFUSE M ODE I S THE R IGHT O NE FOR THE J OB ? D IPOLE M ODE I S T YPICALLY U SED W HEN : • The speaker is located relatively close to the listening position. • Multiple side or rear speakers are being used in a small listening room. • The speaker is mounted near, but not in, a corner and ...

surface, the speaker must be recessed in the wall no more than 1/4 inch. The grille pins fit directly into the speakercabinet via receiver bushings with 15 ft/lb of tension per pin. Use the marked speaker-depth-indicator flanges(attached to the sides of the speaker baffle) to appropriately adjust th...

12 R EQUIREMENTS FOR M OUNTING O PTION 2 – R ETROFIT /P REEXISTING C ONSTRUCTION : Use the S4RFB bracket. Mount the S4RFB to the wall surface and secureit to studs behind the wall. Attach the speaker via mounting flanges to the appropriate recessed distance. The S4VC and S4HC require a minimum6"...

13 To connect the Synthesis Four loudspeakers to the power amplifiers or receiver, use two-conductor insulated speakerwire. We recommend #14 AWG wire as a minimum size. Your JBL dealer can recommend suitable cables. Both the S4VC and S4HC utilize push-style friction binding posts that can accommodat...

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-qualityreproduction of music or soundtracks in a home environment. For example, the dispersion pattern of the front LCR speakersminimizes the effect...

15 However, since it is not possible to “toe-in” flush-mounted speakers, thenext step is the strategic placement ofabsorptive materials on the side walls.These range from commercially avail-able fiberglass and dense foam to heavydraperies and even large, overstuffedfurniture. The optimal position fo...

16 The best arrangement of the absorptive and nonabsorptive surfaces in the room can be seen in Figure 24. Most ofthe room surfaces are relatively absorptive, with the notable exception of the rear wall and the highest portions ofthe other walls, which should be diffusive. “S LAP ” E CHOES “Slap” ec...

17 6 degrees and having the ceiling rise toward the rear of the room at a comparable rate will do wonders for theroom’s acoustics, if the wall design is solid and the angles are clearly intentional from the outset. R ATTLES Rattles in the room are structural resonances (as opposed to standing waves,...

18 B ACKGROUND -N OISE S OLUTIONS Many sources of noise in a home environment can be addressed simply. Locating the home theater in the basement oftenremoves it from many household noises as well as isolating it from other family members. Taking care to completely sealwindows and doors can also make...

19 S TANDING -W AVE S OLUTIONS : R OOM R ATIOS In new construction, the best way to minimizethe audibility of standing waves is to plan foran even distribution of them, so that theireffects do not “pile up” on top of each other. Inthis regard, the ratios of room dimensions arethe critical factor. Ro...

21 S YMPTOM P ROBABLE C AUSE S OLUTION No sound coming • Amplifier not turned on • Turn on amplifier. from speaker • Amplifier gain is low • Make sure that there is amplifier gain for that channel. • Correct source not • Select proper source. selected or turned on • Defective patch cords to amplifie...

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. been...

S PECIFICATIONS 23 M ODEL # S4VC S4HC S4Ai Description 3-Way 8" (200mm) vertical 3-Way dual 6-1/2" (165mm) Configurable-array flush- flush-mount speaker horizontal flush-mount speaker mount surround speaker Power Handling 250W 250W 200W Single-driven or 175W-per-array dual-driven Nominal Imp...