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SURROUND SPEAKER PLACEMENT

• THX–certified surround speakers should be located to the sides of the listeners
instead of behind them. If the viewing area is more than one row deep, place the sur-
round halfway back within the area. If architectural constraints prevent ideal placement
of the surrounds it is generally best to err on the side of being further to the rear of the
room.

• The surround speakers should be located at least two feet above the listener for the
best results. And they should be located at equal heights for uniform frequency
response. Placement close to the ceiling will result in slightly more mid-bass perfor-
mance. Try to place them so the null is aimed towards the seating area.

• THX dipolar surround speakers should be placed so the positive polarity side of the
speaker faces towards the front of the room.

• Conventional surround speakers should be placed behind the listening area and
should also be placed mid wall level or higher.

A more focused surround sound effect will result by aiming the speakers towards your
listening area. If you prefer a more diffuse surround sound effect, then aim the speak-
ers across the back of the listening area. The THX de-correlation circuitry within the SP
MK II will help to create the proper effect for motion picture listening but will be auto-
matically defeated in other surround modes designed for listening to non-encoded
music sources.

15

Surround Loudspeakers

Null

Null

FRONT SPEAKER

Listener

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Содержание SP MKII

Страница 1: ...Spaciousness Press DELAY DOWN to decrease Press BYPASS to turn off Center and Ambient Speakers Cinema Surround MODES 70mm 35mm THX Dolby Press SIBILANCE if dialogue is too loud from Ambient Speakers Press CENTER ON to turn on Center Speaker Press CENTER BOOST to increase volume from Center Speaker Press MUTE to cut off sound Press HI FREQ EQ if sound appears too bright Music Surround MODES Press M...

Страница 2: ...SYNTHESIS SURROUND PROCESSOR Model SP MK II THX Controller A V Surround Processor USER S MANUAL S Y N T H E S I S ...

Страница 3: ... intended to alert the user to the presence of important operating and mainte nance servicing instructions in the literature accompanying the unit CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONAL WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NO...

Страница 4: ...he product should not be situated on a bed sofa rug or similar surface that may block the ventilation openings or placed in a built in installation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings 9 Heat The product should be situated away from heat sources such as radiators heat registers stoves or other products that produce heat If placed near an am...

Страница 5: ... product or c The product has been exposed to rain or d The product does not appear to operate normally or exhibits a marked change in performance or e The product has been dropped or the enclosure damaged 19 Servicing The user should not attempt to service the product beyond that described in the oper ating instructions All other servicing should be referred to qualified service personnel Note to...

Страница 6: ...r unit for any considerable length of time dis connect the plug from the AC outlet Do not place furniture or other heavy objects on the cord and try to avoid dropping heavy objects upon it Also do not make a knot in the power cord Not only may the cord be damaged it can also cause a short circuit with a consequent fire hazard Place of Installation Place the unit on a firm and level sur face Avoid ...

Страница 7: ...e surround channel electronic crossover engaged 4 Connect the output of an audio video source such as a laser disc player or Hi Fi VCR to the SP MK II 5 Turn on the SP MK II 6 Using the handheld remote control set the following MODE Dolby Pro Logic or Home THX Cinema CENTER On if a center speaker is used AMBIENCE REF PANORAMA Center position on DELAY Set to 20 mS 7 Make sure the Bass EQ is turned ...

Страница 8: ...s STAR WARS in 1977 The impact of STAR WARS on the movie watching public is hard to overestimate The quality of the sound track caught everyone s attention and changed what people expect ed from film sound Suddenly people rushed to see new releases in better sounding the atres and the ones which upgraded their sound systems were rewarded with increased revenues Unfortunately there was no standard ...

Страница 9: ...ome And the majority of all standardized dubbing stages now use THX Sound Systems The objective of Lucasfilm Home THX Cinema is to bring precisely this performance standard to a home environment in order to give the filmmaker a transparent path between his creation and the experience of the viewer In general terms this requires solving the problem of transferring sound from a large movie theatre o...

Страница 10: ...The SP MK II incorporates a comprehensive menu of pre programmed modes for play back of music sources Some settings may be altered to suit listening tastes or envi ronmental requirements MOTION PICTURE LISTENING PARAMETERS Four parameters for the playback of motion picture soundtracks are provided includ ing Dolby Pro Logic THX Home Cinema Pro Logic surround decoding and THX audio processing 35mm ...

Страница 11: ...in large auditoriums The entire controller package is a combi nation of Proprietary surround technology for use with both surround encoded and non encoded stereo audio sources Dolby Pro Logic Surround for encoded motion picture stereo CDs and television audio soundtracks THX re equalization de correlation timbre matching circuitry A THX electronic crossover for bi amplification of the main front s...

Страница 12: ...resentation of typical multi track rock recordings The Rock mode is unique in that it provides full frequency range stereo surround channels No other processor is capable of delivering true stereo surround Any audio signal delay setting may be used up to 80 ms and the Panorama control may be adjusted to suit the recording An explanation of the Panorama function is found on page 26 in this manual T...

Страница 13: ...ecay of high frequencies over distance for more natural hall ambience Chamber music is natural and enveloping in this mode as are all small acoustic ensembles The listener is placed close to the performance HALL 2 The Orchestra mode like Chamber uses no processing on the front channels and center channel is disengaged Orchestra mode applies steering logic only to the sur round channels only with a...

Страница 14: ...round decoding along with additional audio enhancements RE EQUALIZATION Re Equalization is necessary to compensate for the fact that the soundtracks in films sound bright in a home environment This results from a combina tion of the way we perceive sound in large auditoriums vs small rooms and the theatre equalization which has become standardized throughout the movie industry The Re Equalization ...

Страница 15: ...lifi cation enables the front speakers to be significantly reduced in size without any penal ty in performance allowing them to be more easily placed for the best imaging The SP MK II includes a specific low frequency steep slope electronic crossover specifi cally designed to match the requirements of Home THX speakers 10 HOME THX CONTROLLER Elements of the Home THX Audio System 1990 LucasArts THX...

Страница 16: ...ont speakers The list of equipment needed for a complete SP MK II Home THX Audio System instal lation is fairly straightforward A SP MK II THX controller At least six channels of amplification for left center right front channels plus two sur round speakers and one or more subwoofers Identical THX left center and right front speakers with appropriate stands or mount ing brackets to facilitate aimi...

Страница 17: ...hould be minimized to maximize video contrast performance particu larly with projection video display systems The main front speakers should flank the screen and be placed with reasonable sym metry with respect to adjacent walls The screen should be well away from side walls The front speakers have broad hori zontal dispersion and it is best to minimize side wall reflections SPEAKER PLACEMENT The ...

Страница 18: ... screen usually reduces stereo separation to unacceptable levels Some experimentation may be in order but as a rule of thumb try to place the L R front speakers no more than 18 to 24 from the sides of the screen Try to avoid placing the L R front speakers too close to side walls or room corners They should usually be placed no closer than 18 to 24 from corners and side walls Conventional speakers ...

Страница 19: ...ided it is magnetically shielded All THX LCR speakers are magnetically shielded SUBWOOFER PLACEMENT Subwoofers do not have to be placed extremely close to the front channel speakers but placement will affect the low bass Leave yourself some leeway during final installation for minor movements to minimize room modes Corner placement will yield the most deep bass but this excites the maximum number ...

Страница 20: ... mance Try to place them so the null is aimed towards the seating area THX dipolar surround speakers should be placed so the positive polarity side of the speaker faces towards the front of the room Conventional surround speakers should be placed behind the listening area and should also be placed mid wall level or higher A more focused surround sound effect will result by aiming the speakers towa...

Страница 21: ...o use a turntable cartridge with the SP MK II you will require a preamplifier or stereo receiver to provide proper pre amplification and RIAA equalization for the magnetic phono cartridge The main output or tape record output from the preamp or receiver should be connected to one of the six audio inputs on the SP MK II The main audio outputs of the SP MK II are designed for use with either THX cer...

Страница 22: ...ay settings can be adjusted from 15 to 30 ms in the Pro Logic or THX Cinema modes up to 50 ms in 35 mm and 70 mm movie surround modes and up to 80 ms in some music modes Changes in audio signal delay set tings are automatically retained in the memory of the SP MK II PANORAMA Panorama settings may be adjusted from 50 to 50 and will vary to taste depending on the individual recording Panorama cannot...

Страница 23: ...their ears If you have any doubt try using the pink noise on Chapter 6 of WOW this should make the difference extremely clear L C POLARITY Check Left Center polarity in the Home THX Cinema mode by feeding mono program material dialog or Chapter 6 of WOW and setting the input balance to the left so as to get equal sound pressure levels out of both the left and center speakers Again listen for a sol...

Страница 24: ...der normal operating conditions the red LED should never do more than flicker occasionally which indicates input over load If no test tone is available you can still calibrate the system with reasonable accuracy by turning up the input level control until the 0 dB LED glows brightly during medium level passages in movies but not high enough to illuminate the red LED Movies are duplicated at slight...

Страница 25: ...the meter pointing straight up towards the ceiling The average setting of the individual output level controls should be ideally near the midrange of their rotation The simplest way to achieve this is to set the Master Volume at 0 REF on the liquid crystal display and then adjust each individual channel output trim control located on the rear panel until a 75 dB SPL is achieved The Master 0 REF se...

Страница 26: ... depends on the distance between the main seating area and the front speakers and the distance between the main seat area and surround speakers Refer to the graph for choosing the best setting in any given situation measure the two distances and look to where they meet on the graph The shaded areas will indicate the best setting for the delay If in doubt simply set Time Link for 20 ms of delay The...

Страница 27: ...nce proper output levels are established SIBILANT FILTER This function accessible via the remote control engages special circuitry which minimizes crosstalk in the surround channels caused by speech sibi lants but without causing loss of high frequency detail An indicator light on the front panel indicates when the sibilant filter is engaged Use the sibilant filter whenever you hear sibilant sound...

Страница 28: ...econds in the other surround modes The trim controls which can be adjusted by hand without the need for special tools are located on the rear panel of the SP MK II A switch on the rear panel next to the electronic crossover switches eliminates the noise burst to the side channel front dipole driver outputs for use with a single pair of point source type surround speakers or when using conventional...

Страница 29: ...contained in this section are not necessary to achieve the kind of impact the SP MK II and a Home THX Audio System can provide The fol lowing ideas and suggestions are for the most demanding installations or when the room itself presents a special challenge ACOUSTICAL PROBLEMS IN LISTENING ROOMS The Home THX Audio System addresses many of the problems common to high quali ty reproduction of music ...

Страница 30: ...ensure a wide usable listening area This design choice can induce reflections off of the side walls especially in installations where they are relatively close to the front speakers These reflections can be reduced simply by angling the left and right speakers inward somewhat If giving the speakers some toe in is not enough the next step is the strategic place ment of absorptive materials on the s...

Страница 31: ...found in Chapter 6 of the WOW laserdisc If you can move the cloth in front of the speaker without hearing a difference you are all set Large expanses of glass can be challenging They reflect mids and highs but often pass bass through almost as though they didn t exist The result is a characteristically bright rough sound which can be difficult to correct electronically The best treatment is genera...

Страница 32: ...e with the notable exception of the rear wall and the highest portions of the other walls which should be diffusive SLAP ECHOES Slap echoes are common in rooms which have parallel walls with little or no absorp tion or diffusion Sounds tend to bounce back and forth between the parallel wall many times before they die out causing a characteristic bright zingy sound and interfering with the intended...

Страница 33: ...proximately 6 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 RATTLES Rattles in the room are structural resonances as opposed to standing waves which are airborne resonances which the system may stimulate due to its broad frequency response and w...

Страница 34: ... environment effectively limits the perceived dynamic range of the pro gram material This in turn limits the dramatic effect which might have been intended by the director or the performer if listening to music Constant background noise also obscures or masks low level signals which are fre quently important in films Many scenes use subtle ambient noises to set the mood prior to an important event...

Страница 35: ...ed with fiberglass this also can enhance the perceived bass since the subwoofers may cause structural vibrations through the false floor which then get transmitted up through furniture Seal all windows doors 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 atten tion away fr...

Страница 36: ...ng colorations due to standing waves often requires significant adjustment of subwoofer placement Leave yourself some lati tude with regard to subwoofer placement when planning your system the final adjust ment will probably have to be done on something of a trial and error basis STANDING WAVE SOLUTIONS ABSORPTION In theory it is possible to damp standing waves with absorptive material The difficu...

Страница 37: ...room This is its best use If everyone used EQ this way it wouldn t have the bad repu tation that it has in some consumer electronics circles Professional use it all the time with excellent results because they know its limitations and how to apply it Never equalize a room by ear Room analysis is not as straightforward as it may seem The analysis should be done using equipment with at least one thi...

Страница 38: ...al for use with your SP MK II processor A short list of film titles is provided below which provide exceptional audio mixes 33 ALL STAR WARS ALL STAR TREK ALL INDIANA JONES THE ABYSS AIR AMERICA ALIENS AMADEUS APOCALYPSE NOW REISSUE WIDESCREEN BACKDRAFT BACK TO THE FUTURE BACK TO THE FUTURE II BATMAN BEETLEJUICE BLACKRAIN BLADERUNNER REISSUE WIDE SCREEN BRAINSTORM DANCES WITH WOLVES DICK TRACY GHO...

Страница 39: ...aterials Miscalibration of center check levels using WOW disc or channel output level internal test noise sequencer Clipping distortion Input level miscalibration Recalibrate input level controls Inadequate power amps Use larger amplifiers Subwoofer level too high Adjust subwoofer level of crossover Excessive room Remove absorption selectively absorption Poorly recorded Try alternative program sou...

Страница 40: ...product to the factory without our prior authorization In the United States please call 1 800 336 4JBL for the location of the authorized warranty station nearest you If service under this warranty is not necessary but you have questions regarding the installation or oper ation of this unit please contact your authorized JBL retailer or call 1 800 336 4JBL for further assistance WHO PAYS FOR WHAT ...

Страница 41: ... V 100K ohms Output Impedance 300 ohms unbalanced Signal to Noise All outputs better than 95 dB A weighted referenced to rated output Static Interchannel 35 dB minimum typically better than 40 dB in Separation Motion Picture Dolby Pro Logic and Home THX Cinema surround modes with center channel and crossover engaged Dimensions Weight 17 1 wide x 15 deep x 3 8 high 3 5 high with support feet remove...

Страница 42: ... Movie THX Power S Y N T H E S I S Center 70 mm Movie Mono Enhance Sound Stage Engage one of these for movie listening Press VOLUME up or down to make system louder softer Engage one of these for music listening Press POWER to turn system ON OFF JBL SP SP MK II Surround Processor User s Manual Quick Start BASIC OPERATIONS Engage one to select a source ...

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