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Страница: 22 / 24

YMPTOM

ROBABLE

AUSE

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 placed optimally

Poor or smeared imaging

• Poor room acoustics

• Use absorptive materials to minimize

early reflections.

• Aim speakers at listening area.

• Poor program source

• Check another program source.

• Improper polarity

• Check polarity of wire connections.

Indistinct dialogue

• Slap echoes

• Add absorption or diffusion materials.

• Miscalibration of center

• Check output levels of surround processor.

channel output level

Uneven surround coverage

• Poor speaker placement,

• Place surrounds according to THX

strong reflections

specifications.

• Add absorption and/or diffusion materials.

• Excessive absorption near

• Remove absorptive material to provide

surrounds

surround reflections.

ROUBLESHOOTING

Содержание S4A

Страница 1: ...SYNTHESIS FOUR S4VC S4HC S4Ai FLUSH MOUNT LOUDSPEAKERS OWNER S AND INSTALLER S MANUAL ...

Страница 2: ... MOUNTING THE SPEAKERS 10 SPEAKER MOUNTING OPTIONS 10 REQUIREMENTS FOR MOUNTING 11 CONNECTING THE SPEAKERS TO THE REST OF YOUR SYSTEM 13 PREPARING THE HOOKUP WIRE 13 FINE TUNING YOUR AUDIO SYSTEM 14 ACOUSTICAL PROBLEMS IN LISTENING ROOMS 14 ROOM REFLECTIONS 14 EXCESSIVE USE OF ABSORPTIVE MATERIALS 15 SLAP ECHOES 16 RATTLES 17 BACKGROUND NOISE 17 BACKGROUND NOISE SOLUTIONS 18 STANDING WAVES 18 STAN...

Страница 3: ...L Professional LSR studio 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 The midrange drivers seamlessly comple ment the titanium dome tweeter and offer nearly perfect pistonic motion which eliminates the uncontrollable flexing found in con...

Страница 4: ...dspeaker One S4VC vertical channel flush mount loudspeaker One S4Ai multipole ambient flush mount loudspeaker Four mounting L brackets with eight 1 4 20 x 3 4 screws Eight 8 32 x 1 2 screws for speaker installation One grille with grille frame INCLUDED ...

Страница 5: ...age of its sound dispersion characteristics If you mount it horizontally it will not provide the correct dispersion pattern If the speaker is being used with a perforated projection screen it should be mounted behind the center of the screen see Figure 2 If a nonperforated projection screen plasma display or other fixed video device is being used in the installation the preferred center speaker is...

Страница 6: ... expenditure from any individual speaker Placement of the surround speakers remains critical 5 1 CHANNEL SYSTEMS The S4Ai multipole ambient surround speakers work optimally if they are placed as far back from the screen as the viewing chairs are If there are two rows of chairs these speakers should be placed between them The ambient surround speakers should be placed higher than the seating area a...

Страница 7: ...or to trigger the autoswitching relay in the loudspeakers The input to the trigger connection is located at the bottom of the speaker next to the speaker terminals see Figure 8 and accepts two conductor 24 to 16 AWG wire The relay is activated by a con stant 12V DC signal S4Ai WIRING GUIDE Each S4Ai speaker can be wired in single or dual drive mode The best performance can be obtained by installin...

Страница 8: ...ion Setting the phase in relation to the other speakers in the room only applies when the S4Ai speakers are set in Dipole mode If you choose to use the S4Ai in Dipole mode the following information for proper phase relations between speakers will apply The S4Ai speakers are shipped from the factory with the phase switch in the OUT position In this position the posi tive phase array is pointing tow...

Страница 9: ...is being installed in a ceiling and the joists are running from front to back in the room In that situation conventional in wall side channels would be firing side to side rather than front to back To correct this and produce the correct pattern remove the eight retaining screws from the diffuse array and rotate 90 degrees so the dispersion pattern is correct in relation to the room and the other ...

Страница 10: ...ing to the right rather than the left MOUNTING THE SPEAKERS SPEAKER MOUNTING OPTIONS The S4VC S4HC and S4Ai models all use the same mounting bracket There are two models to choose from based on the type of installation In the case of new construction choose the S4PCB preconstruction bracket For retrofit instal lation use the S4RFB Both are sold separately The speakers will fit into standard constr...

Страница 11: ...h to the wall surface REQUIREMENTS FOR MOUNTING OPTION 1 NEW CONSTRUCTION The S4PCB mounting flange bracket must be installed before the drywall is installed in the room Attach the included L brackets to the speakers see Figure 14 and attach them to the mounting flanges at the appropriate recessed distance The S4VC and S4HC require a minimum 6 wall depth The S4Ai requires a minimum 4 wall depth se...

Страница 12: ...l any type of mounting bracket other than the S4PCB the S4RFB or any other bracket that JBL may supply for these speakers in the future Drilling holes in the product or improperly installing mounting brackets may void your JBL warranty and cause a safety hazard A JBL factory authorized custom installer can install appropriate brackets Contact JBL and your installer dealer for additional informatio...

Страница 13: ...ote the terminal and black for the terminal although some electronics manufacturers have adopted the new color coding standard promulgated by the Consumer Electronics Association 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...

Страница 14: ...ur system s sound reproduction ROOM REFLECTIONS The most troublesome room reflections are usually the early reflections of the front LCR speakers off the floor ceiling and side walls These reflections reach the listener s ears after a delay with respect to direct sounds and blur the perceived image They can also degrade dialogue intelligibility through the same mechanisms see Figures 21 and 22 The...

Страница 15: ...tions 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...

Страница 16: ...e playback system to create the environment rather than having the room s native acoustic signature color everything The solution for slap echoes is usually a combination of absorption and diffusion Specifically place absorptive mate rial behind the front speakers heavy drapes fiberglass dense foam and elements that will facilitate diffusion in the rear of the room bookcases irregularly shaped fur...

Страница 17: ...stem should be subjected to the rattle test at least once the difference in low level resolution and in freedom from pseudodistortion is sometimes large while the effort involved is quite small BACKGROUND NOISE The effect of background noise on system performance is dramatic yet often overlooked Most people might think of it merely as a minor inconvenience yet it has a profound effect on the way w...

Страница 18: ...d with fiberglass this also can enhance the perceived bass since the subwoofers may cause structural vibrations through the false floor that can then be transmitted up through furniture Seal all windows doors and vents Seal and caulk all apertures in the wall electrical outlets through wall plumbing etc Finally transient noises traffic on the street dripping faucets etc distract your attention awa...

Страница 19: ...woofer placement Leave yourself some latitude with regard to subwoofer placement when plan ning your system the final adjustment will probably have to be done on something of a trial and error basis See Figures 28 and 29 for some suggestions STANDING WAVE SOLUTIONS ABSORPTION In theory it is possible to dampen standing waves with absorptive material The difficulty is that the thickness of the abso...

Страница 20: ...yze the various room modes and recommend appropriate action This will sometimes take the form of a custom designed bass trap which may be easily con structed But it takes specific skills to determine its optimal design In other cases careful analysis and parametric equalization may be appropriate Optimize everything else that you can then use EQ if necessary to touch up the room This is its best u...

Страница 21: ... Digital or DTS mode make correctly sure that the receiver processor is configured so that the speaker in question is enabled Center speaker is configured In Dolby Pro Logic mode make sure the incorrectly center speaker is not in phantom mode Problem not diagnosed To diagnose the likely source of the problem it is often helpful to switch the nonfunctioning speaker with one that is functioning corr...

Страница 22: ...ize early reflections Aim speakers at listening area Poor program source Check another program source Improper polarity Check polarity of wire connections Indistinct dialogue Slap echoes Add absorption or diffusion materials Miscalibration of center Check output levels of surround processor channel output level Uneven surround coverage Poor speaker placement Place surrounds according to THX strong...

Страница 23: ...t shielded aluminum baskets High Frequency 1 25mm Pure titanium 1 25mm Pure titanium Triple 1 25mm pure titanium Transducer s dome with rubber surround dome with rubber surround dome with rubber surrounds shielded with EOS waveguide shielded with EOS waveguide shielded with EOS waveguide Dimensions H x W x D 23 7 8 x 14 x 5 1 2 14 x 23 7 8 x 5 1 2 23 7 8 x 14 x 3 3 4 606mm x 356mm x 140mm 356mm x ...

Страница 24: ...01 11 05 Declaration of Conformity We Harman Consumer Group International 2 route de Tours 72500 Château du Loir France declare in own responsibility that the products described in this owner s manual are in compliance with technical standards EN 61000 6 3 2001 EN 61000 6 1 2001 Luc Guillaume Harman Consumer Group International Château du Loir France 11 05 ...

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