LSR Manual for pdf
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1. Input Impedance nominal 4 ohm oo ELp Na Anechoic Sensitivity 93 d 28V 1m 90 dB TW 1m a Sl ical Resse each sean Frequency Response 60 Hz 22 kHz 1 15 PRS Xm i s Low Frequency Extension E BE 200 3dB 54 Hz H a 10dB _35 k i EM Ea Enclosure resonance frequency 28 Hz EM Long Term Maximum s00 Power IEC 265 5 200 W Continuous 800 W Peak MEN o Recommended Amplifier Power 150 W 1000 W rating into 4 ohm load HO gi HF Frequency Control 100 Frequency 1000 Hz 10000 20K 2 5 kHz 20 kHz 0dB 1dB Distortion 96 dB SPL 1m B 1 m Distortion raised 20 dB Low Frequency below 120 Hz 36 dB stortion raised 20 d 2nd harmonic lt 1 5 1 3rd harmonic lt 1 Mid amp High Frequency 120 Hz 20 kHz a 2ndharmonic 0 5 i ENT 3rd harmonic 0 4 5 aig ore Distortion 102 dB SPL 1m 80 j i LLL Low Frequency below 120 Hz 2ndharmonic lt 1 596 3rd rasied 20dB R 3rd harmonic 1 2 HA Mid amp High Frequency 80 Hz 20 kHz nd harmonic lt 1 T 3rd harmonic lt 1 N B lt 0 4 250 Hz 20 kHz eo Power Non Linearity 20 Ez 20 KRY 2 m Frequency a ii sae a 30 watts lt 0 4 dB 100 watts lt 1 0 dB Crossover Frequencies 250 Hz and 22 kHz 102 dB 1 m Distortion raised 20 dB Transducers no 7 7 T Low Frequency Model 252G lc a Diameter 300 mm 12 in a Li A rN Voice Coil 50 mm 2 in Differential Drive 4 Pa f2. Unbalanced Source LSR XLR Input Unbalanced Diagram B When using unbalanced signals with an LSR28P it is recommended to use a 1 4 Tip Ring Sleeve connec tor This input has been specifically designed to accommodate a wide variety of balanced and unbalanced connec tions Figure C shows when using the 1 4 Tip Ring Sleeve connection the GROUND should be tied to the source and not the sleeve of the LSR input for optimum performance Unbalanced Source LSR28P T R S Input Unbalanced Diagram C Figure D details the connections using single conductor shielded cable with a Tip Ring Sleeve plug for the LSR28P input Single conductor cable should be used as a last resort as it provides the most possibility for problems The HOT signal should be connected to the tip of the Tip Ring Sleeve plug The GROUND should be attached to the Ring of the Tip Ring Sleeve plug at the LSR28P input Unbalanced Source LSR Input Unbalanced Diagram D 21 Figure E details the connections using unbalanced cable and Tip Sleeve connections to the 1 4 input In this mode the Ring and Sleeve of the LSR input are shorted by the plug automatically Unbalanced Source LSR T R S Input I gt Tip i Sleeve Unbalanced Tip Sleeve Connectors short the Ring and Sleeve Automatically Unbalanced Figure E 22 23 UBL JBL Professional 8500 Balboa Boulevard P O Box 2200 Northridge Ca
3. 3 0 Basic Introduction The LSR32 Linear Spatial Reference Studio Monitor combines JBUS latest in transducer and system technology with recent breakthroughs in psychoacoustic research to provide a more accurate studio reference The neodymium 12 woofer is based on JBL s patented Differential Drive technology With the neodymium structure and dual drive coils power compression is kept to a minimum to reduce spectral shift as power levels increase An added third coil between the drive coils acts as a dynamic brake to limit excess excur sion and reduce audible distortion at the highest levels The cone is made of a carbon fiber composite forming a rigid piston supported by a soft butyl rubber surround The midrange is a 2 neodymium magnet structure with a woven 5 Kevlar cone The powerful motor structure was chosen to support the low crossover point to the woofer In order to achieve the goal of accurate spatial response the crossover points are located at 250 Hz and 2 2 kHz These transition points were chosen to match the directivity characteristics of the three transducers The high frequency device is a 1 composite diaphragm integrated with an Elliptical Oblate Spher oidal EOS Waveguide with 100 x 60 degree dispersion which is critical to the smooth spatial response required in today s working environments The Mid and High devices are mounted within millimeters of each other on a cast aluminum sub baffle that can be rotated for hori
4. Dynamic Braking All LSR low frequency transducers are equipped with an electromagnetic braking voice coil to reduce the effects of extreme excursion with high transient material Titanium Composite High Frequency Device Using patented technology the high frequency device incorporates titanium and composite materials to improve transient response and reduce distortion By reducing distortion in the lower operating range where the ear is most sensitive ear fatigue is radically reduced Elliptical Oblate Spheroidal EOS Waveguide Designed for a targeted listening window of 30 horizontally and 15 vertically the EOS provides a frequency response through the entire window of 1 5 dB from on axis This allows listeners even far off axis to hear an accurate representation of the on axis response Neodymium Midrange with Kevlar Cone A2 neodymium motor structure is used in the LSR32 for high excur sion capability with an intentionally low crossover point of 250 Hz This improves the spatial response of the sys tem which is crucial for accurate reproduction Section 2 GETTING STARTED 2 1 Unpacking When removing the systems from their packaging it is important not to grasp the units from the front This is identified as the carbon fiber baffle and can easily be distinguished by the silver stripe Because the high frequency device is located near the top of the cabinet on the front a stray hand or finger can cause
5. LSR Linear Spatial Reference Studio Monitor stem Owner s Manual Important Safety Instructions AN CAUTION RISK OF ELECTRIC SHOCK DO NOTOPEN DO NOTEXPOSE TO RAIN OR MOISTURE ATTENTION RISQUE DE CHOC ELEC TRIQ NE PAS ENLEVER NEPASEXPOSER LA PLUIE NI A LHUMIDIT Explanation of Graphic Symbols The exclamation point within an equilateral triangle is intended to alert the users to the presence of important operating and maintenance servicing instructions in the literature accompanying the product Thelightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of insulated dangerous voltage within the product s enclosure that may be of sufficient magni tude to constitute a risk of electric shock to humans CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIHED PERSONNEL ATTENTION POUR EVITER LES RISQUES DE CHOC ELECTRIQUE NE PAS ENLEVER LE COUVERCLE AUCUN ENTREITEN DE PIECES INTERIEURES PAR LUSAGER CONFER LENTRETIEN AU PERSONNEL QUALIFIE AVIS POUR EVITER LES RISQUES D INCENDIE OU D ELECTROCUTION N EXPOSEZ PAS CET ARTICLE A LA PLUIE OU A L HUMIDITE The IEC fuse symbol pictured at the left represents an approved user replaceable fuse When replacing a fuse make sure to replace with only the correct type and fuse rating 1 Read Instructions Before
6. The 1 feed is sent directly to the discrete input of the LSR12P When not in bypass the system operates as the Stereo and Prologic setups previously described All subwoofer information is derived from the front channels and the discrete 1 input is ignored When a contact closure occurs the high pass filtering is bypassed to the satellites and the sub woofer feed is from the discrete 1 input Additional information is contained in section 5 5 5 2 AC Power Connections The LSR12P has a multi tap transformer which allows it to be used around the world Before connecting the unit to AC power confirm that the switch setting on the rear of the unit is set to the proper position and the fuse is the correct rating as listed on the rear of the system The LSR12P will accept voltages from 100 120 or 200 240 Volts 50 60 Hz when the voltage settings are set correctly 115V 230V The ground terminal of the TEC plug is required by wiring codes and regulations It must always be connect ed to the electrical installation safety ground The LSR units have carefully designed internal grounding and balanced inputs and outputs to reduce the event of ground loops hum If hum occurs see Appendix A for suggested correct audio signal wiring and system grounding 5 3 Changing Audio Levels Switch 1 enables the input trim pot With the switch in the down position the trim pot is out of the circuit and doe
7. a i oe jilli i L KE 20 100 1000 Hz 10000 20K 20 100 Frequency 1000 Hz 40000 20K 1 On Axis Response 2 Spatially Averaged Response over a range of 30 Horizontal amp 15 Vertical 3 First Reflection Sound Power 4 Total Radiated Sound Power 5 DI of On Axis Response 6 DI of First Reflections 20 NE i i i 1 20 100 Frequency 1000 Hz 10000 20K 16 LSR28P SPECIFICATIONS System Frequency Response 1 1 5 dB 50 Hz 20 kHz Low Frequency Extension 3 dB 10 dB User controls set to default 46 Hz 36 Hz Enclosure resonance frequency 38 Hz Low High Frequency Crossover Distortion 96 dB SPL 1m Mid High Frequency 120 Hz 20 kHz 2nd Harmoni 3rd Harmoni Low Frequency 120 Hz 2nd Harmoni 3rd Harmoni 1 7 kHz 6th Order Acoustic Linkwitz Riley lt 0 6 lt 0 5 lt 2 lt 1 Maximum SPL 80 Hz 20 kHz gt 108 dB SPL 1m Maximum Peak SPL 80 Hz 20 kHz Signal Inp ra 2111 dB SPL 1m XLR Balanced Pin 2 Hot 1 4 Tip Ring Sleeve Balanced Calibrated Input Sensitivity XLR 4 dBu 1 4 10 dBV 96 dB 1m 96 dB 1m AC Input Voltage AC Input Voltage Operating Range 115 230VAC 50 60 Hz User Selectable 15 AC Input Connector TEC Long Term Maximum S
8. outputs to reduce the event of ground loops hum If hum occurs see Appendix A for suggested correct audio signal wiring and system grounding 4 3 Audio Level Adjustment The audio level sensitivity of the LSR28P can be adjusted for almost any situation Monitor outputs on consoles are normally at a nominal level of 4 dBu or 10 dBv These are typically called professional and semiprofessional respectively The LSR28P can be set up for fixed or variable gain As shipped from the factory the nominal input level of the XLR input is 4 dBu and 10 dBv for the 1 4 T R S input Anominal level to these inputs will produce an output of 96 dB SPL at 1 meter in an anechoic environment This allows the user to get a good match when using either professional or semiprofessional equipment If less sensitivity is needed 4 8 or 12 dB of signal attenuation can be inserted using the DIP switches on the back WARNING f AVIS H P4 See Owners Manual For Set Up E O And Safety Instructions SHOCK HAZARD DO NOT OPEN 120 240 V 50 60Hz 175 Watts RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR H ation a E ds D PN am A PN n LR r y N ZA T O CO m y Jack N PA O mum V n UE CM Etat Serial No e plion Active With Switch Up LSR28P dob x il d JBL PROFESSIONAL Linear Spatial Reference sw ryscdc Northridge CA USA Bi Amplified Monitor 120V BTAl250v
9. performed with the input voltage necessary to produce the stated A weighted SPL level at the stated measurement distance Distortion figures refer to the maximum distortion measured in any 1 10th octave wide band in the stated frequency range JBL continually engages in research related to produce improvement New mate rials production methods and design refinements are introduced into existing products without notice as a routine expression of that philosophy For this rea son any current JBL product may differ in some respect from its published description but will always equal or exceed the original design specifications unless otherwise stated 19 Appendix A Wiring Recommendations By now you have probably plugged the LSR monitors in and are making great music However for optimum performance some attention to wiring details now can reduce system degradation later These cabling recommendations follow standard wiring practice for differential inputs Balanced Sources The best way to run your system is balanced where both HOT and COLD signals are supplied from the source as well as a GROUND SHIELD These are typically carried on 2 conductor shielded cables with XLR connectors on both ends Alternatively connectors with Tip Ring and Sleeve T R S jacks can be used Whenever possible the cable shield should not be connected to any signal pin but left to perform a cable shielding function only Not
10. with Dynamic Braking Coil a A 5 i Magnet Type Neodymium Pi Cone Type Carbon Fiber Composite AL Impedance 4 ohm Al mie Mid Frequency Model 9006 AI E FIIO f Diameter 125 mm 5 in s att Voice Coil 50 mm 2 in Aluminum Edge Wound A M O FA Magne Type Neo dymium 20 100 Frequency 1000 Hz 10000 20K E pM i otes Cone Type _Kevlar Composite All measurements unless otherwise stated made anechoically at 2 meters and refer Impedance 4 ohm enced to 1 meter by the inverse square law High Frequency Model 053ti The reference measurement microphone position is located perpendicular to the cen Dia neier 25mm 1 in diaphragm ee e oe bend transducers at the point 55 mm 2 2 in below Voice Coil 25 mm 1 in Mean SPL level from 100 Hz to 20 kHz Magnet Type Ceramic 5 Describes Anechoic 47 low frequency response Acoustic Loading provided by the Diaphragm Type Damped Titanium Composite istening room will increase low frequency bass extension Other Features Elliptical Oblate Spheroidal Waveguide Sod A weighted SPL level at the stated measurement distance Distoruon figures Impedance 4 ohm refer to the maximum distortion measured in any 1 10th octave wide band in the stat f ed frequency range Physical Power Non Linearity figures based on the A weighted deviation from linear increase Finish Black Low Gloss Sand Texture in SPL with linear increase in input power ie power compression measure
11. HA Harman international Company S N GI WARNING To Reduce Risk of Fire or Electric Shock 7 gt i S O O Do Not Expose This Equipment to Rainor Moisture O Assembledin USA Switch 1 enables the input trim pot With the switch in the down position the trim pot is out of the circuit and does not affect the input sensitivity In the up position the input trim is added to the circuit and will attenuate the input level from 0 12 dB from nominal Switch 2 inserts 4 dB of attenuation to both the XLR and 1 4 T R S inputs when in the up position Switch 3 inserts 8 dB of attenuation to both the XLR and 1 4 T R S inputs when in the up position 4 4 Low Frequency Adjustments The low frequency response of the LSR28P can be adjusted to increase or reduce the output level This is typically done when the system is located near a wall or other boundary surface With all bass adjustment switches off the unit is set to a 36 dB octave roll off with a maximally flat characteristic Switch 4 changes the low frequency roll off to a 24 dB octave slope which extends the low frequency capahility while slightly reducing maximum sound pressure level This is useful for spoting subsonic dis tortions that could otherwise go undetected For exam ple extreme low frequency rumble will be visable as movement of the woofer cone Switch 5 changes the low frequency roll off to 36 dB octave with a 2 dB boost below 150 Hz If more b
12. Maximum Continuous SPL Maximum Peak SPL gt 112 dB SPL 1m 35 Hz 80 Hz gt 115 dB SPL 1m 35 Hz 80 Hz Calibrated Input Sensitivity XLR 4 dBu XIR 10 dBV 96 dB 1m 96 dB 1m Power Non Linearity 20 Hz 200 Hz 30 watts 100 watts Power Clip Bypass Indications Amplifier 04dB lt 1 0 dB Green LED Normal Operation Amber LED Bypass Mode Red LED Limiter Activated Low Frequency Topology Class AB All Discrete Sine Wave Power Rating THD N 1 2 power 260 Watts lt 0 5 THD into rated impedance lt 0 05 AC Input Voltage 115 230VAC 50 60 Hz User Selectable AC Input Voltage Operating Range AC Input Connector 15 TEC Self Generated Noise Level 10 dBASPI 1m Transducers Low Frequency Modal 202F Diameter 300 mm 12 in Voice Coil 50 mm 2 in Differential Drive with Dynamic Braking Coil Magnet Type Cone Type Neodymium with integral heatsink Carbon Fiber Composite 2 ohm Impedance User Controls Low Frequency Control lt 50 Hz 2 dB 0 dB 2 dB Left Center and Right Inputs XLR Balanced 10 dBv 44 dBu Nominal Pin 2 Hot Discrete Input XLR Balanced 4 dBu Nominal Pin 2 Hot Calibrated Input Levelt 10 dBy 4 dBu 8 dBu Variable Input Attenuation Left Center and Right Outputs 0 13 dB XLR Balanced 10 dBv 4 dBu Nominal Pin 2 Hot Out
13. a aR RME tas Page 10 4 5 High Frequency Adj usirit ett ueterem leidet Page 10 4 6 TED FAG aL TA dece attoniti a raa penam Manet Meet ai Page 10 5 0 LSRI2P Active Ub WOOIER a nina S esx GA in nia ia Page 11 DL ADU CNES oniani ini eed daveb ER PR a Ra Reno Page 11 5 2 AC Power COMMER TIONS a aa pad aa BAN a Ka BA A BADAN Da qus Page 12 5 3 Audio Level Adjustment mmm mna nn nn an ann aa p bc dts Page 12 54 Low Frequency Character US a oso si iann Od o e IU Page 13 5 5 Bypass and Discrete Operation voavieavv dore aei Nobb nnno Mod fincas Page 13 VO LED LOT COL nn a aaa Uv V MA ER EAR GT Page 14 6 0 Specifications eae ae nee p MI LR bud tuttd card Page 15 UY S M S Page 15 0 2 ESR2GP nn RE Reb v a t RR Page 17 Dig LOR IAP P MN Page 19 ADDED DA aa tenn tambor mS trate ear eee eR au Mor rui au Mtf Page 20 LSR Studio Monitor Owner s Manual Section 1 INTRODUCTION Congratulations on selecting the LSR Linear Spatial Reference Studio Monitors They represent the sum total of our research and development efforts in sound reproduction While we don t expect you to read the entire manual we do suggest section 2 to get started At that time you should have a system to listen to while you intensely study the rest of the manual for maximum performance Beginning with a blank CAD screen today s equivalent to a clean sheet of paper the LSR products have been based on fundamental research into
14. all aspects of monitor design JBL designed the entire system starting with the materials and topologies of the individual transducers through to the final assembly of the diecast parts The results are incredibly accurate reference systems with high dynamic capabilities and astonishingly low distor tion LSR New Technologies Linear Spatial Reference A measurement and design philosophy that takes into account many additional factors beyond on axis frequency response The overall performance of the systems are optimized within a wide listening window for exceptional performance in a variety of acoustic spaces Attention to these critical aspects results in a rock solid image that remains consistent throughout the entire listening field Differential Drive New voice coil and motor assemblies have two drive coils with twice the thermal surface area of traditional speakers This enables LSR systems to provide higher peak output with less power compression bet ter heat dissipation and a flatter impedance curve at higher frequencies These properties reduce spectral shift that causes monitors to sound different when driven at differing power levels By reducing the thermal related effects the LSR range will sound the same at low medium or high levels Linear Dynamics Aperture Contoured ports virtually eliminate high end turbulence found in traditional port designs This provides more accurate low frequency performance at higher output levels
15. ance and cart combination should be moved with care Quick stops excessive force and uneven surfaces may cause the appliance and cart combination to overturn JBL Professional 8500 Balboa Blvd Northridge CA 91329 USA Tel 1 818 894 8850 Fax 1 818 830 1220 Web wwwjblpro com The information contained in this document is confiden tial and the copyright of JBL Professional To convey its contents in part or in whole to any third party without prior written autho ization is a violation of the copyright JBL Professional 1998 4 Table of Contents Sa UH ROTE d deerit edat lota een o A re hd Page 2 2 0 Getting Started mem tb cuf a endet ti he Page3 2 LUDERE RUBER A A NR rE CER NT TT Page3 22 Placa atirar on Qvid A A ERR a Page3 Zo ALYCLORCOLI aa aude ed REPRE Aa Page4 ZA Power Connects oceans tesserae mass vsu sti rc roh Page 5 25 Mata Sound Happii Zoos ad Bo ERA ORE RUP RENE ARR ai Page5 3 0 ES uS olde Page 6 3 1 ADOLO a Goat Pad pi dee oa n eer ga edi Page 7 3 2 High Frequency Adjusment a vett aet bd o bac d dfi Lai vu Page 7 3 3 Changing Mid High Oren tab OTLo sors URDU RO UR A iii Page 7 4 0 LSR28P 2 Way Bi Amplified Monitor doo VR UMP I eO Oruro in Page 8 EIS UTER BY NT 22 REN MR NE Page 8 42 AC Pover CORTIOCUOUS wean EEE E naaa ANA tr A Page 8 2 3 Audio Level Adjustment pod ope ioo a a an ii an Page 9 4 4 Low Frequency Adjustments caosa ROREM ENERO S bM cen
16. ass is desirable in the monitor this is the position to use In a typical monitor situation this position could lead to Bass Light records as the user compensates in the mixing suite for the extra low end boost Switch 6 changes the low frequency roll off to 36 dB octave with a 2 dB cut below 150 Hz If required the LSR28Ps can be used closer to walls or other boundaries This position reduces the low frequency to compensate for boundary effects caused by this positioning 4 5 High Frequency Adjustments T Switch 7 boosts the high frequency response by 2 dB above 1 8 kHz This posi a Switch 7 On 2 dB tion is used if the room is extremely dead or n Switch 7 amp 8 Off Flat mixes translate too bright Switch 8 On 2 dB Switch 8 cuts the high frequency m response by 2 dB above 1 8 kHz This posi m tion is used if the room is highly reflective a or mixes translate dull 4 6 LED Indication ad Asingle LED indicator is located on 4000 Hz 40000 20k the front of the LSR28P In normal opera tion this LED will be GREEN At the onset of amplifier clipping in either the low or high frequency amplifier the LED will flash RED Continual RED flashing of this LED indicates that levels should be reduced 10 Section 5 LSR12P ACTIVE SUBWOOFER The LSR12P Active Subwoofer consists of a high powered Differential Drive 12 neodymium woofer integrated with a powerful 250 watt continuous power output amplifi
17. d after 3 Enclosure Volume net 50 liter 1 8 cu ft minutes of continuous pink noise excitation at the stated power level Input Connectors Two pair of 5 way binding posts JBL continually engages in research related to produce improvement New materials Net Weight 21 3 kg 47 lbs production methods and design refinements are introduced into existing products g without notice as a routine expression of that philosophy For this reason any current Dimensions WxHxD 63 5 x 394 x 29 2 cm 25 0 x 155 x 11 5 in JBL product may differ in some respect from its published description but will always equal or exceed the original design specifications unless otherwise stated 15 Acoustic Contribution Impulse Response Mic Output volts 10 1 1 L L 1 20 100 Frequency 1000 Hz 10000 20K o 1 2 3 4 5 5 Ro and asied 2006 eme Green 3rd rasied 20dB System Impedance Power Compression 100 3 2 i i 1 l i 3 10 n o E E E IT A 1 10 WATTS E REDEEM 5 N77 PF M2 30 WATTS i l N3 100 WATTS 180 3 E s pmm sol Poe MEN i lol
18. damage An easy way to safely unpack your monitors is to open the top of the box keep the cardboard filler piece on and roll the box upside down The box can then be slipped off This also works in reverse for repack ing the units to take them to the next session 2 2 Placement The design of the LSR systems lend themselves to a wide variety of placement options Covered here is a typical stereo setup for near to mid field monitoring A deeper discussion of multi channel sound setup is available from JBL in Tech Note Volume 3 Number 3 Listening Distance By evaluating a broad cross section of studio environments it was determined that the common listening position at recording consoles is generally 1 to 1 5 meters 3 to 5 feet for near field applications For mid field applications 2 to 3 meters is more likely The real key to successful placement is to form an equilateral triangle between the monitors and the prime listening position As shown below the distance between the monitors and the distance between each monitor and the center of the listener s head are equivalent Vertical vs Horizontal Placement The LSR28P near field is designed to be positioned vertically This orientation eliminates the phase shifts that occur when the relative distances between the woofer tweeter and the listening position change The LSR32 is normally used in the horizontal position This makes for the lowest elevation to maxi mize sight li
19. e Under no circumstances should the safety ground wire be removed from the AC power connector When using balanced sources with the LSR28P either the XLR or T R S input of the Neutrik Combi connector can be used The difference between the two is that the T R S is set for a nominal 10 dBv input and the XLR is set for 4 dBu Balanced Source LSR Input Sleeve Balanced Diagram A For balanced signals the HOT signal from your source should be connected to the tip of the T R S connector or Pin 2 of the XLR input as shown in figureA The COLD signal should be connected to Pin 3 of the XLR or the Ring of the T R S connector To avoid ground loops connect the SHIELD at the source end but not at the LSR input Note The LSR12P uses only XLR inputs and outputs Unbalanced Sources When using unbalanced sources there are more possibilities to introduce ground loops into a sys tem The LSR28P and 12P offer several ways to help alleviate potential problems with unbalanced equipment 20 While there are only HOT and GROUND SHIELD connections from unbalanced sources it is recommended that high quality twisted pair cable be used Figure B shows an unbalanced source connected to the balanced XLR input of the LSR monitor using twisted pair cable Note that the shield is connected to the GROUND SHIELD connec tor at the LSR input but not at the source This reduces the likelihood of introducing a ground loop into the system
20. er The active drive circuitry has been developed to maximize the acoustic output power while maintaining overall low distortion and high transient performance The enclosure is manufactured with a carbon fiber composite baffle and rigidly braced MDF enclosure for low resonance and minimal box lose The Linear Dynamics Aperture LDA Port design mini mizes port noise and eliminates bass robbing port compression Active crossover electronics supply 4th order electroacoustic slopes to the low pass subwoofer transi tion to reduce the possibility of localization of the subwoofer This allows a greater flexibility in placement for optimum operation in a wide variety of rooms Since low frequency energy supplied by the LSR12P is essential ly omnidirectional placement of the unit s is more dependent upon room acoustics and interactions than localization issues Also included with the active electronics are switchable high pass filters for the front satellite speak ers This option is used when it is desired to filter out low frequency information from the front speakers and redirect this information to the subwoofer This is usually the case when the front speakers are small near fields that cannot handle extended low frequency information at the desired sound pressure level Altematively if the front channels are operated in full range the bypass function can be enabled allowing the subwoofer to be muted at the close of a switch contact to compare the diffe
21. is put on a track that has a good amount of bass and switch between the two positions The setting that produces the most bass should be the one to go with The low frequency response of the LSR12P can be adjusted to compensate for room placement Bass frequencies below 80 90 Hz are essentially omnidirectional Positioning subwoofers in corners or against walls will increase the in room efficiency of the system allowing greater apparent output Placing subwoofers against wall boundaries will also reduce frequency response variations due to cancellation interference These bass adjustment switches compensate for location by adjusting the amount of low frequency energy generated below 50 Hz A technique that has been used successfully is to put the subwoofer in the listening position and move the mic or yourself into possible subwoofer locations Finding the positions with the best low frequency energy can quickly be found After you find a couple of possibilities move the subwoofer into one of these locations and evaluate Switch 5 reduces the level below 50 Hz by 2 dB This position is designed to offer maximally flat response when the LSR12P is placed at the intersection of two boundaries such as a floor and wall Switch 6 reduces the level below 50 Hz by 4 dB This position has been designed to offer maximally flat response when the LSR12P is placed at the intersection of three boundaries such as a comer location 5 5 Bypass and Discrete Operati
22. lifornia 91329 U S A LSR MANUAL 24 H A Harman International Company Sob 1M
23. ly engages in research related to produce improvement New mate rials production methods and design refinements are introduced into existing products without notice as a routine expression of that philosophy For this rea son any current JBL product may differ in some respect from its published description but will always equal or exceed the original design specifications unless otherwise stated 17 Impulse Response Acoustic Contribution JBL Professional AI Ia a 100 Mic Output volts 3 dB 8 SPL 8 amp D ES b o N D E Li 1 E A cos T 6 2 LSR28P Response Curves JBL Professional 20 100 Frequency 1000 Hz 10000 20K 100 Frequency 1000 Hz 30000 20K On Axis Response Spatially Averaged Response over a range of 30 Horizontal amp 15 Vertical First Reflection Sound Power Total Radiated Sound Power DI of On Axis Response DI of First Reflections 18 LSR12P SPECIFICATIONS Specifications System Frequency Response 6 dB 28 Hz 80 Hz Low Frequency Extension 3 cB 10 dB User controls set to default 34 Hz 26 Hz Enclosure resonance frequency Low High Frequency Crossover 28 Hz 80 Hz 4th order electroacoustic Linkwitz Riley Distortion 96 dB SPL 1m Low Frequency lt 80 Hz 2nd Harmonic 3rd Harmonic lt 2 lt 1
24. made of a carbon fiber composite forming a rigid piston and is supported by a soft butyl rubber surround The high frequency device is a 1 composite diaphragm integrated with an Elliptical Oblate Spheroidal EOS Waveguide with 100 x 60 degree dispersion which is critical to the smooth spatial response required in today s working environments 4 1 Audio Connections The LSR28P comes with a Neutrik Combi connector that accommodates either an XLR or 1 4 connector in balanced or unbalanced configurations The XLR input is nominal 4 dBu and the 1 4 is setup as standard for 10 dBv Positive voltage to Pin 2 of the XLR and the tip of the 1 4 jack will produce a forward motion in the low fre quency cone 4 2 AC Power Connections The LSR28P has a multi tap power transformer which allows it to be used around the world Before connect ing the unit to AC power confirm that the switch setting on the rear of the unit is set to the proper position and the fuse is the correct rating as listed on the rear of the system The LSR28P will accept voltages from 100 120 or 200 240 Volts 50 60 Hz when the voltage settings are set correctly 115V 230V The ground terminal of the IEC plug is required by wiring codes and regulations It must always be connected to the electrical installation safety ground The LSR units have carefully designed intemal ground ing and balanced inputs and
25. nes and reduce shadowing effects of soffit mount monitors In applications where vertical orienta tion is desired the entire mid and high assembly can be rotated 90 to a line array position LSR32L in Horizontal Position LSR32L in Vertical Position The LSR12P can be placed in either a vertical or horizontal orientation More important than orien tation is the physical room placement As with any low frequency system subwoofer placement in smaller spaces such as control rooms have a great deal of room interaction See Section 5 for more information on subwoofer placement and suggested ways to fine tune the monitoring system for optimum performance Angling towards the listening position LSR monitors should be angled to directly face the listener The center of the high frequency transducer should be on axis with the ear level of the listener 2 3 Audio Connections LSR32 Audio Connections The LSR32 is equipped with two pair of 5 way binding posts The lower pair feed the woofer and the top pair feed the mid and high frequency elements The connectors are designed to accept up to 10 ANG bare wire Spacing of the two input terminal pairs allows use of standard Dual Banana jacks The two pairs are normally connected together with metal shorting bars This allows either pair to be used in normal operation Alternative cabling possibilities include bi wiring and passive bi amping or usi
26. ng both terminals to get more copper from the amp to the speaker Positive voltage to the Red terminal will produce a forward motion in the low frequency cone LSR28P Audio Connections The LSR28P comes with a Neutrik Combi connector that accommo dates either an XLR or 1 4 connector in balanced or unbalanced configurations The XLR input is nominal 4 dBu sensitivity and the 1 4 input is 10 dBv Additional nominal levels and variable user calibration can also be accommodated See Section 4 for additional information on level control and gain matching Positive voltage to Pin 2 of the XLR or the tip of the 1 4 jack will produce a forward motion in the low frequency cone LSR12P Audio Connections The LSR12P subwoofer contains both input and output XLR connec tors for three channels which are typically Left Center and Right The inputs are shipped with a sensitivity of 10 dBy but can be changed by moving a dip switch on the back of the unit See Section 5 for additional infor mation on level control and gain matching The outputs transmit either full range or high passed information depending on the mode of the subwoofer An additional discrete input is included that is active when the unit is in L C R bypass mode This allows routing for a separate signal directly to the input electronics of the LSR12P in applications such as 5 1 monitoring The nominal input is 4 dBu on the direct XLR input connector Posi tive
27. on The 1 4 jack used for bypass and discrete selection operates with a simple dry contact closure between the tip and sleeve of the jack This function can also be initiated with an opto isolated electronic closure shorting the two contacts together The sleeve of this connector is tied to audio ground so care should be taken to avoid ground loops when using this option 13 5 6 LED Indication Amulticolor LED indicator is located on the front of the LSR12P In normal operation this LED will be GREEN When the LSR12P is in bypass mode the LED will tum AMBER This indicates that the high pass filters on the three outputs are bypassed and the subwoofer feed is from the discrete input At the onset of amplifier limiting the LED will flash RED Continual RED flashing of this LED indicates that the levels should be reduced 14 Section 6 LSR32 SPECIFICATIONS Amplitude amp Phase
28. operating your new JBL LSR product please read all safety and operating instructions 2 Keep these instructions For future reference and troubleshooting purposes retain these instructions 3 Heed all warnings All wamings in this user manual should be followed 4 Follow Instructions By following instructions presented in this guide you should be able to quickly enjoy an accurate and safe monitoring system 5 Water and Moisture Do not use this apparatus near water for example bathtub sink or in the shower regardless of how well you sing 6 Cleaning Clean with a lint free cloth Do not use any solvent based cleaners on the carbon fiber finish A slightly damp cloth can also be used on the enclosure surfaces and woofer surrounds 7 Ventilation Do not block any ventilation opening including the Linear Dynamics Aperture Port on the LSR monitor systems by installing these products in accordance with manufacturers instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus that produce heat More Safety Instructions 8 Grounding and Power Cords The power cord supplied with your powered LSR product has a 3 pin type plug Do not cut off or damage the grounding pin and once again don t use in a shower If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched
29. particularly at plugs convenience receptacles and the point where they exit the apparatus All powered LSR products are fitted with a detachable power cord supplied which connects to the chassis AC connector The power cord has an IEC female connector on one end and a male mains connector on the other end This cord is supplied specifically to accommodate the different safety and electrical code requirements of individual countries If you are traveling abroad with your system test the power mains and be aware of any specific voltage requirements before operating your system 9 Options Only use attachments or accessories specified by the manufacturer 10 Non use Periods Unplug this apparatus during lightning storms earthquakes fires floods locusts or when unused for long periods of time 11 Servicing Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the LSR monitor the monitor has been exposed to rain or moisture does not operate normal ly exhibits signs of schizophrenia or other psychosis or has been dropped 12 Wall or Ceiling Mounting The appliance should be mounted to a wall or ceiling only as recommended by the manufacturer 13 Carts and Stands The appliance should be used only with a cart or stand that is recommended by the manufacturer An appli
30. per from the amp to the speaker Positive voltage to the Red terminal will produce a forward motion in the low frequency cone Use only two conductor insulated and stranded speaker wire preferably no smaller than 14 AWG Cable runs exceeding 10 meters 30 feet should be made with heavier wire 12 or 10 ANG 3 2 High Frequency Adjustment The LSR32 High Frequency level can be adjusted to compensate for placement or bright rooms The unit is shipped in the flat or 0 dB position If the unit sounds too bright in your room or you are work ing very close to the monitors under 1 1 5 meters the response above 3 kHz can be brought down by approximately 1 dB This adjustment is accomplished via the barrier strip on the back of the enclosure located above the dual pair of 5 way binding posts Moving the link between the 0 and 1 dB position will change the high fre quency drive level Please note that the loudspeaker should be disconnected from the amplifier during this procedure for safety of the system and yourself 100 MENT 20 0 dB 1 dB 60 20 100 Frequency 1000 Hz 10000 20K 3 3 Rotation of Mid High Transducers The LSR22 is normally used in the horizontal position with the mid and high frequency elements toward the middle This provides the lowest elevation maximizes sight lines and reduces shadowing effect
31. put High Pass Filters 80 Hz 2nd Order Bessel Selectable to Full Range Polarity Adjustment Normal or Inverted Remote Bypass Connector 1 4 Tip Sleeve Jack Physical Finish Baffle Material Black Low Gloss Sand Texture Carbon Fiber Composite Enclosure Volume net 50 liter 1 8 cu ft Net Weight Dimensions WxHxD 22 7 kg 50 lbs 63 5 x 39 4 x 29 2 cm 250 x 15 5 x 11 5 in Amplitude contribution with LSR12P and 28P 100 Frequency 1000 Hz 10000 20K 96 dB 1 m Distortion raised 20 dB o0 LUTTE m set dins LION ON NN mnm SPL g dB L 20 100 Frequency 1000 Hz 1000 20 Low Frequency Adjustments 100 an LElat 2dB J g Ma a0 2 70 60 20 1 Frequency 1000 Hz 10000 20K Notes Left Center and Right Inputs Produces Quasi fourth order Linkwitz Riley Acoustic High pass alignment when used with LSR28P or LSR32 All measurements unless otherwise stated made anechoically in a 4x environment at 2 meters and referenced to 1 meter by the inverse square law The reference measurement microphone position is located perpendicular to the upper edge of the center of woofer trim ring Acoustic Loading provided by the listening room will increase maximum SPL capabilities and low frequency bass extension as compared to stated anechoic values Distortion measurements
32. r Composite Cabinet Construction Net Weight 19mm 3 4 MD E 22 7 kg 50 lbs Dimensions WxHxD 406 x 330 x 325 mm 16 x 13 x 1275 in Amplitude and Phase 100 JBL Professional SPL yx s 100 Frequency 1000 Hz 10000 96 dB 1 m Distortion raised 20 dB 100 AL ON Pn nk SPL g 8 dB 100 Frequency 1000 Hz 10000 102 dB 1 m Distortion raised 20 dB 100 Frequency 1000 Hz Notes All measurements unless otherwise stated at 2 meters and referenced to 1 meter by made anechoically in a 4x environment the inverse square law The reference measurement microphone position is located perpendicular to the centerline of the low and high frequency transducers at the point 55 mm 2 2 in below the center of the tweeter diaphragm The Reference Measurement Microphone osition is located perpendicular to the upper edge of the center of woofer trim ring Acoustic loading provided by the listenin room increases Maximum SPL capabil ities and Low Frequency Bass Extension as compared to stated anechoic values Distortion measurements performed with the input voltage necessary to produce the stated A weighted SPL level at the stated measurement distance Distortion figures refer to the maximum distortion measured in any 1 10th octave wide band in the stated frequency range JBL continual
33. rent combinations dur ing mixing 5 1 Audio Connections There are several ways to connect the LSR12P into a monitoring system including stereo and multi channel formats such as Dolby ProLogic AC 3 DTS MPEG and others The bass management system in the LSR12P provides the flexibility to switch between configurations In a Stereo Configuration it is typical to feed the LSR12P with the left and right channels and take the left and right outputs from the LSR12P and feed them to the satellites The high pass filters on the outputs remove the low frequency energy below 85 Hz from the satellites This energy is redirected to the subwoofer The ProLogic format from Dolby uses a similar connection scheme to the one above The Left Cen ter and Right channels route to the Left Center and Right inputs of the LSR12P and through the respective outputs to the satellites Energy below 85 Hz is filtered out of the satellites and sent to the subwoofer Other multichannel formats such as Dolby AC 3 DTS MPEGII include six discrete channels Left Center Right Left Surround Right Surround and Subwoofer These are termed 5 1 for five main channels and a dedicated subwoofer channel which is also called the Low Frequency Effects or LFE channel Not all materi al uses all channels and engineers have the discretion to use the subwoofer 11 The Left Center and Right channels are routed to the respective LSR12P inputs and on to the front channels
34. s not affect the input sensitivity In the up position the input trim is added to the circuit and will attenuate the input level from 0 12 dB Switch 2 changes the nominal sensitivity of the LSR12P Left Center and Right inputs to 4 dBu Switch 3 changes the nominal sensitivity of the LSR12P Left Center and Right inputs to 8 dBu 12 WARNING AN TN Lavist I See Owners Manual for Set up and Safety Instructions RISQUE DE CH NE PAS OUVRIR A OF J 4 a W N Meme D SN JN Wm y E S A e wy i Input 4dBu Left In LeftOut Centerin CenterOut Rightin RightOut Trim Sub Direct Bypass mm 0 nals LSR12P Er re Sig J 1 assed Sub Dri 3 d ow Passed L To Reduce Risk of Fire or E ose This Equipment to Rain 120V 5TA 250V 240V 2 5TA 250V JBL PROFESSIONAL hridge CA USA H A Harman International Company Linear Spatial Reference Powered Subwoofer lectric Shock 7 Assembled in USA in oi 5 4 Changing Low Frequency Characteristics Switch 4 reverses the polarity of the LSR12P At the crossover point between the subwoofer and satel lite speakers it is important that all systems are in the correct polarity If the subwoofer and the satellite woofers are in the same vertical plane the polarity should be set to normal If the subwoofer is not in the same plane as the satellites the polarity might need to be reversed To check th
35. s of soffit mount monitors In situations where vertical orientation is desired the entire Mid High sub baffle can be rotated NOTE The mid and high transducers can be easily damaged by wayward screwdrivers Take great care to protect them as long pointy objects tend to have negative effects on performance which are not covered under warranty 1 Place the LSR32 on its back on a stable surface 2 Carefully remove the eight phillips screws surrounding the Mid High sub baffle 3 Gently lift the baffle out enough to rotate the assembly You can use your hand in the port to assist Do not pull the unit out entirely This avoids unnecessary tension on the cabling assemblies 4 Replace the eight screws and tighten Again take note to be VERY careful to guard against transducer damage Section 4 LSR28P GENERAL OPERATION 4 0 Introduction The LSR28P Bi amplified reference monitor sets a new standard for exceptional performance in a near field design Using a combination of advanced transducer engineering and powerful drive electronics the LSR28P will stand up to the most demanding sessions The 8 woofer is based on JBLs patented Differential Drive technology With dual 1 5 drive coils power compression is kept to a minimum to reduce spectral shift as power levels increase An added third coil between the drive coils acts as a dynamic brake to limit excess excursion and reduces audible distortion at maximum levels The cone is
36. voltage to Pin 2 of the XLR will produce a forward motion in the low frequency cone 2 4 AC Power Connections The LSR28P and LSR12P have power transformers which allow them to be used with multiple AC supply voltages around the world Before connecting the unit to AC power confirm that the switch setting on the rear of the unit is set to the proper position and the fuse is the correct rating The LSR28P and LSR12P will accept voltages from 100 120 or 200 240 Volts 50 60 Hz when the voltage setting and fuse is correct The ground terminal of the IEC plug is required by wiring codes and regulations It must always be connected to the electrical installation safety ground The LSR units have carefully designed internal grounding and bal anced inputs and outputs to reduce the possibility of ground loops hum If hum occurs see Appendix A for suggested audio signal wiring and system grounding 2 5 Making Sound Happen After connections are made the next step is to power up all equipment before the amplifiers Reduce the level of the monitor outputs of your console or preamp to minimum and tum on the amplifiers There is a small delay with the tum on of the LSR28P and LSR12P to accommodate for clicks and thumps from upstream equipment When the Green LED on the front panel turns on the units are ready to go Slowly advance the gain of the console to feed the monitoring system and sit back and enjoy Section 3 LSR32 GENERAL OPERATION
37. ystem Power Self Generated Noise Level 220 Watts IEC265 5 10 dBASPI 1m User Controls High Frequency Control 2 Khz 20 tz 42 dB 0 dB 2 dB Low Frequency Control 100 Hz 2 dB 0 dB 2 dB Low Frequency Alignments 36 dB octave 24 dB octave Calibrated Input Attenuation Variable Input Attenuation 5dB 10 dB 0 12dB Transducers Low Frequency Modal Diameter 218F 203 mm 8 in Voice Coil 38 mm 1 5 in Differential Drive with Dynamic Braking Coil Magnet Type Ferite with Integral Heat Sink Cone Type Impedance Carbon Fiber Composite 2 ohm High Frequency Model 053ti Diameter Voice Coil 25 mm 1 in diaphragm 25 mm 1 in Magnet Type Ferrite Diaphragm Type Other Features Damped Titanium Composite Elliptical Oblate Spheroidal Waveguide Impedance 4 ohm Amplifier Low Frequency Topology Class AB All Discrete Sine Wave Power Rating 250 Watts lt 0 1 THD into rated impedance THD N 1 2 power High Frequency Topology lt 0 05 Class AB Monolithic Sine Wave Power Rating 120 Watts 0 196 THD into rated impedance THD N 1 2 power Physical 0 0596 Finish Black Low Gloss Sand Texture Enclosure Volume net Low Frequency Vent 50 liter 1 0 cu ft Rear Ported Linear Dynamics Aperture Baffle Construction Carbon Fibe
38. zontal or vertical placement This allows max imum flexibility in placement to reduce console and ceiling splash that destabilizes imaging and depth The crossover filters are optimized to yield 4th order 24 dB octave Linkwitz Riley electroacoustic responses from each transducer in phase 6 dB at crossover In order to achieve optimal symmetrical response in the vertical plane both magnitude and phase compensation are implemented in the crossover net work The crossover network allows the user to adjust the high frequency level above 3 kHz This allows the lis tener to compensate for effects of near field or mid field spectral balance or differing amounts of high frequen cy absorption Components used in the crossover are exclusively low loss metal film capacitors low distortion electrolytic capacitors high Q high saturation current inductors and high current sand cast power resistors 3 1 Audio Connections The LSR32 is equipped with two pair of 5 way binding posts The lower pair feed the woofer and the top pair feed the mid and high frequency elements The connectors are designed to accept up to 10 AWG bare wire Spacing of the two input terminal pairs allows use of standard Dual Banana jacks The two pairs are nor mally connected together with metal shorting bars This allows either pair to be used in normal operation Alternative cabling possibilities include bi wiring and passive bi amping or using both terminals to get more cop
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