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L-ACOUSTICS XT LINE

1. 40 Figure 2I 94 Line isto TE E Mq E 44 Figure 22 T2XT ETRI12XT Eine oci eer e ten ert eee ree sow as 45 Figure 23 I2XT XTLIFTBAR Line Drawing 45 Figure 24 I2XT ETRII2XT I I2CPLXT Line Drawing 0 degree 46 Figure 25 I2XT ETRII2XT I I2CPLXT Line Drawing 30 degrees 46 Figure 26 USAT Line Drawing sad oct u M 48 Figure 27 SAT P ETRIUSX F Eine Drawingu u un er bras au eee boe tae et a Eden 49 Figure 28 L15XT F2KTEIFFBAR Drawing ocio rei stad qe n napa a Rao i m 49 Figure 29 115 ETRIISXT I IBXTCPL Line Drawing 0 degrees 50 Figure 30 115 ETRIISXT I IBXTCPL Line Drawing 30 degrees 50 LIST OF TABLES Table Load and Power Ratings for 2 12 Table 2 Recommended power amplification and MLS switch settings for 2XT low section 13 Table 3 Recommended power amplification and MLS switch settings for 2XT
2. b ri Mia eun cH 41 6 1 RECOMMENDED MAINTENANCE PROCEDURES 41 622 s d I EM eee cence EU 42 7 SPECIFICATIONS m l i 43 Ul TID ELEMENT SPECIFICATIONS u uu ul l u 43 7 2 VASAT ELEMENT SPECIFICATION S a ah 47 L ACOUSTICS XT Manual V1 2 11 2003 3 LIST OF FIGURES Figure I AT System Componentes uuu l s a sapaska edu Roten cele leues to imde 8 2 HT BRCIOSUES u uuu usu aede abe hua kanaka 10 Feure 3 IEMGlIOSUN PN Figure 4 MLS switches on the rear panel of L ACOUSTICS LA24a LA48a 14 Figure 5 L ACOUSTICS preset library for DP224 21 Figure 6 L ACOUSTICS preset library for DP226 22 Figure 7 L ACOUSTICS preset library for BSS FDS 334 Minidrive 23 Figure 8 L ACOUSTICS preset library for BSS FDS 336 Minidrive
3. 3828 SEM HI 5 3040936 xma e M2xrLOw 8 i 38H80 1oxTLOW xma sme rowe mxs 3038 19 smia snee naxriow IDXTH FIL FULL FULL B 155815 27 xma sie 1ISXTH Figure 8 L ACOUSTICS preset library for BSS FDS 336 Minidrive L ACOUSTICS XT Manual V1 1 2 11 2003 24 L ACOUSTICS 7 0902 PRESETS for BSS 366 PRESET NAME PGM TYPE OUT I Source OUT 2 Source OUT 3 Source OUT 4 Source OUT 5 Source OUT 6 Source USER L 304308 3 A 3 B 3 A 3 B ARC 21810 3 A 3 B SB218 A ARCS HI A SB218 B ARCS HI B ARC 218 HI 3 A 3 B SB218 A ARCS HI A SB218 B ARCS HI B 3 A 3 B dV SUB ARCS HI A dV SUB B ARCS HI B 3 A 3 B dV SUB A ARCS HI A dV SUB B ARCS HI B 3 A 3 B FULL A ISFM FULL B ISFM HI B 3 A 3 B FULL A 115 FULL 115 B 3 A 3 B 5 115 115 HI 58 115 15FM HI 3 A 3 B 58118 HI A 58 118 B I5FM HI B 3 58218 I5FM HI SB218 B I5FM HI B 3 A 3 B dV SUB A 115 HI A dV SUB B 3 A 3 B FULL A L12XT HI FULL B 112 HI B
4. 30 4 5 DISTRIBUTED SOUND REINFORCEMEN Foss uuu u um Su eek 30 4 5 OVERHEAD DISTRIBUTED SYS DEMS i uyu u u u u uu puhu na leuia ia dete edis 30 4 5 2 STS TEMS uu Re 30 253 COPNPEEMEBIPARY IEIEL 3 u 3l 5 u QU a bore 32 7 STAGE MONITORIN G ercis uM MEME ut 32 4 0 USING XTWITFESUBW OOFERS t reri let bedient 34 2 9 COMBINING XT WITEESUBVVOQOPFERS uu u e u Ede oe pb a 35 2 0 2 GROUND STACKED SESTEIIS iiti pu ESO uum cul edad de aaa k 35 4 8 3 SEPARATE FLOWN XT ARRAY WITH GROUND STACKED SUBWOOFERS 35 5 INSTALLATION PROCEDURES ioo eit u Q Saa asus 37 5 1 12 ETRI I5XT U BRACKET ATTACHMENT u u 1 nai ahua 37 5 2 CPLII2XT CPLI 15XT COUPLING ADAPTER BAR ATTACHMENT 38 S S u puma e 40 o d napi Pc E 40 6 5
5. 24 Figure 9 L ACOUSTICS preset library for BSS FDS 366 Omnidrive Compact Plus 25 Figure 10 General guidelines for aiming XT enclosures 27 Figure SPL mappings at octave band frequencies for a single XT 27 Figure 12 SPL mappings at octave band frequencies for two XT enclosures with 0 5 metre spacing 28 Figure 3 SPL mappings at octave band frequencies for two XT enclosures with 3 metre spacing 28 Figure 4 General guidelines for arraying XT enclosures 29 Figure 15 SPL mappings at octave band frequencies for four XT enclosures with 0 5 metre spacing 29 Figure 16 L ACOUSTICS Subwoofer Continuous Unweighted SPL 34 Figure 17 Illustration of subwoofer time alignment 36 Figure 18 ETRI I2XT ETRIISXT U bracket installation procedure 38 Figure 19 I2XT CPLII5XT coupling adapter installation procedure 39 Figure 20 XTLIFTBAR installation procedure
6. 485 Figure 29 115XT 5 Line Drawing 0 degrees 670 1 OU P lt E e 1 NS Figure 30 115XT ETRII5XT 115 Line Drawing 30 degrees L ACOUSTICS XT Manual VI 1 02 03 50
7. MANUAL ORGANIZATION LL I u aa TABLE OF CONTENTS u er M OF FIGURES 550 M N 4 LIS TOF TABLES 0 TAN 4 2555 55 5 M 5 TIE XT SV STEM i u 6 Ed oS ISTEM COMPONENT dice bt 6 IZ XXL OV ERVEN Sumu etu a Su m m a m UE 9 SPECIFICATIONS csr sie aa aun aa tat as aab pate ta 10 FAETSASISSPECIRICATIONS u u _____ sat qu tue p a as Ze POWERING gue I2 Z2 P POWERING ow ou M Uu HM ERE 12 ZAFON ERINGA LIX Tu u u ta ce ce ite cade Dara et sel eal al ease atten 14 23 CONNECTORS AND CABLES SE uu S pot Redes tuta bn cct tuba latest air Bod 17 3 XT CONTROL AND PROCESSING uu u l ee eon nona eod a ai I7 3 GENERAL DESCRIPTION OF AT PRESETS S uu uu u un MR E 18 MCCC 18 3 3 GUIDELINES REGARDING SYSTEM ah 19 3 4 DCT PRESET BIBRARIES ctae au DS u edens bti E 20 A SOUND DESIGN MUTA 26 Edid Vp beber kah uuu ase 26 4 2AlIMINGATENCLIOSUREYu 26 4 ARRAYING ENGLOSURES inta t G aa aun 27 4 4 PREDICTING XT COVERAGE uyan spate dagen
8. 10 Rotate the loudspeaker into position to select the desired angle Secure automatically secures the U bracke using the locking pins on both fixed and pivoting arms Figure 18 ETRII2XT ETRIISXT U bracket installation procedure 5 2 CPLII2XT CPLIISXT COUPLING ADAPTER BAR ATTACHMENT CPLII2XT or CPLII5XT coupling adapter bars are optional accessories that can be used in conjunction with ETRII2XT or ETRIISXT U brackets to array two 112 or 115 enclosures vertically with independent tilt adjustment for both enclosures 2 CPLI12XT pre installed with ETRII2XT 3 Install the top 112 Ensure that the I2XT rotating arm is properly secured by verifying that the spring loaded locking pin 4 Select angle and secure top locking pins on both sides for the at the pivot point is correctly seated upper 112 do not attach middle locking pins for the CPLII2XT L ACOUSTICS XT Manual V1 1 2 11 2003 38 5 With middle locking pins unattached the I 2XT is free to 6 Lower 112 installed rotate facilitating installation of the lower 12 7 Attach lower locking pins on both sides of the lower 112 to 8 Attach lower locking pins on both sides of the lower I2XT to facilitate angling of the CPLII2XT facilitate angling of the CPLII2XT 9 Release lower locking pins to perform final angling of the lower _ 0 The final installed system Side flytrack sections and PION2 1
9. HIGH Amplifier Output Power 2160 W into 2 ohms Based on these specifications recommended L ACOUSTICS LA power amplifier specifications and MLS switch settings are summarized in Tables 2 and 3 In these tables boldface settings indicate a good power match based on the recommended power amplifier specification Table 2 Recommended power amplification and MLS switch settings for 12XT low section 112 LOW SECTION AMPLIFIER OUTPUT POWER POWER MLS SETTING do not use do not use Table 3 Recommended power amplification and MLS switch settings for 1 12XT high section I 12XT HI SECTION AMPLIFIER OUTPUT POWER POWER MLS SETTING L ACOUSTICS LA amplifier MLS switch settings for powering the 112 are summarized in Table 4 and Figure 4 shows the location of MLS switches on the LA24a and LA48a rear panel L ACOUSTICS XT Manual 2 11 2003 3 Table 4 Recommended MLS switch settings for powering 1 2XT 12XT HI SECTION OUTPUT CH B 7 MLS switch CH B l CH B Patent Made im Figure 4 MLS switches on the rear panel of LLACOUSTICS LA24a LA48a amplifiers 2 2 POWERING 115 Continuous rms and peak power handling ratings for the 5XT are as follows LF Section 45 volts rms long term pink noise with 6 dB crest factor 250 Watts continuous 1000 Watts peak at 8 ohms HF Section 26 volts rms long term pink noise with 6 dB crest fact
10. T 14 A lt i 1 44 Figure 23 2 XTLIFTBAR Line Drawing L ACOUSTICS XT Manual VI 1 02 03 45 ASS NO E 3 Figure 24 112 ETRI I2XT 112CPLXT Line Drawing 0 degree 530 a 4 Figure 25 2 ETRII2XT II2CPLXT Line Drawing 30 degrees L ACOUSTICS XT Manual VI 1 02 03 46 7 2 115XT ELEMENT SPECIFICATIONS Frequency Response Frequency response 60 18k Hz 3 dB FRONT preset Usable bandwidth 50 18k Hz 10 dB Sensitivity LF 2 83 Vrms at m 98 dB SPL 60 Ik Hz HF 2 83 Vrms at m 108 dB SPL 1 18 kHz Power Rating Amplification Impedance Long Term recommended nominal LF 45 5 250Wrms 1000 Wpeak 500 W 8 ohms HF 26 Vrms 85 Wrms 350 W peak 350 W 8 ohms Nominal Directivity 6 dB Axi symmetrical 80 20 System Output SPL One enclosure 122 dB cont 128 dB peak FRONT preset 124 dB cont 30 dB peak FILL preset 126 dB cont 32 dB peak 3W preset FRONT preset provides 3 dB low and high frequency contours under freefield conditions FILL preset provides nominally flat response under freefield conditions 3W preset applies a 100
11. A SUB B SB218 A I I5FM LO A HI SB218 B dV SUB A LO A I I5FM HI A dV SUB B I5FM 3W 218 3 way A SUB B 2 LO A I 12XT HI 2 LO B 12XT HI B I 5FM 3W dV SUB 3 way A SUB B l 12XT LO A 112 HI l 12XT LO B 12XT HI B l 12XT LO A 112 HI I 12XT LO B l 12XT HI B I2XT 2W FILL 2 way stereo I2XT 2W FRONT 2 way stereo SBII5 I I2XT LO A 2 A SBII5 B SBII5 A I I2XT LO A 2 HI SBII5 B I2XT 2W MONITOR 2 way stereo not linked 58118 A I I2XT LO A 2 A SBII8 B 15 5 s 3 way SUB B 3 way A SUB B 3 way A SUB B 118 12XT LO 2 HI SBI18 B 3 way A SUB B 2 SB218 A I I2XT LO 12XT HI SB218 B 3 way A SUB B 22 dV SUB A I 12XT LO A 2 A dV SUB B I2XT 3WX dV SUB 3 way A SUB B 23 dV SUB A 12XT LO I2XT HI A dV SUB B Iac A UE lt I5XT 2W FILL 2 way stereo 24 I 15XT LO A HI A 15XT LO B HI B 2 way stereo not linked 26 15XT LO HI 15XT LO B HI B EC I5XT 5 115 3 way A SUB B 27 SBII5 A I I5XT LO HI 58115 3 way SUB B 28 5 115 I I5XT LO I5XT HI 58115 B 29 SBII8 A I I5XT LO A I5XT HI A SBII8 B 3 way SUB
12. FULL A 112 HI FULL B 12XT HI B FULL A I2XT HI A FULL B 12XT HI B 58115 12XT HI A 58115 B 112XT HI B 58115 A 112 HI A SBII5 B 12XT HI B 5 1 18 A HI 5 18 12XT HI B 58118 A 12XT HI A 58118 B I2XT HI B SB218 A HI A SB218 B 12XT HI B 58218 A 112 HI A 58218 B I2XT HI B 12 dVS 3 23 dV SUB 2 HI dV SUB B 112 HI B 12 X dVS 3 A 3 B 24 dV SUB A 12XT HI dV SUB B 12XT HI B I5XT FIL 3 A 3 B 25 FULL A I5XT HI FULL B I5XT HI B 3 A 3 B 26 FULL A I5XT HI A FULL B I5XT HI B 3 A 3 B 27 FULL A 115 HI FULL B HI B 3 A 3 B 2 SBII5 A 15XT HI 115 B 15XT HI B 3 A 3 B 2 58115 115 A SBII5 B I5XT HI B 3 A 3 B SBII8 A HI A 58118 B I5XT HI 3 A 3 B 5 118 A 115 HI A 58 18 B 115 HI B 15 58218 3 A 3 B SB218 A 115XT HI SB218 B I5XT HI B 15 X218 3 A 3 B 218 115 A 218 15XT HI B dV SUB A 15XT HI A dV SUB B 15XT HI B 3 A 3 B dV SUB A 115 LOW A I 15XT HI dV SUB B I 15XT LOW I 15XT HI B NTENTIONALLY BLANK G x 2 way presets follow LLL sssi s ms J Sis s si T s s zc I ARCS 2W LO 2 A 2 B 2 C ARCS LOW A ARCS
13. subwoofers are used as an effect and are not driven with the same signal as the main XT system separate auxiliary send from the console while in other cases the subwoofers are used as a low frequency extension of the array and are driven with the same signal in 3 way mode In general Presets have 100 Hz 24 dB octave Linkwitz Riley LR24 low pass filter for the subwoofers with a complimentary 100 Hz LR24 high pass filter for the I2XT or 15 low section Complimentary 100 Hz crossover filtering optimizes the power bandwidth for the subwoofer and the 112 5XT low section presets are recommended for all stacked XT subwoofer applications where the enclosures are closely coupled physically 3WX presets have an 80 Hz LR24 low pass filter for the subwoofers and an overlapping LR24 high pass filter for the XT low section 45 Hz HPF for 112 40 Hz HPF for 115 Due to the overlap in the operating bandwidths of the sub and low sections subwoofer polarity may have to be inverted due to the phase shift of overlapping crossover filters depending on the selected preset and how the subwoofers are driven via AUX send or with the same signal as sent to the XT system 4 8 2 Ground Stacked Systems For ground stacked systems XT and subwoofer enclosures are physically close to each other and time alignment is simplified throughout the audience area since there are no arrival time path length differences bet
14. 14 8 in deep When used on its rear side the front baffle of the enclosure is oriented at a 45 degree angle with respect to vertical allowing the enclosure to be used as a floor monitor Enclosure weight is 27 kg 59 5 Ibs Cabinet construction consists of 30 mm 1 18 in and 18 mm 0 70 in Baltic birch plywood with internal steel bracing and joints that are sealed screwed and rabbeted The finish is maroon gray high resilient paint The front of the enclosure is protected by a black powder coated 1 5 mm 0 06 in thick steel grill that is covered with 10 mm 0 4 in thick acoustically transparent open cell foam The I I2XT has two side recessed flytrack sections and 36 mm 1 42 in diameter pole mount sockets mounted the top and bottom sides Pole mount sockets function with the ETRII2XT U bracket accessory for rigging the enclosure in either horizontal or vertical orientations providing angular adjustment with 10 degree resolution Two CPLII2XT coupling adapter bars can be used in conjunction with the ETRII2XT U bracket allowing two 112 enclosures to be flown vertically while providing independent tilt adjustment for each enclosure The XTLIFTBAR accessory functions with either of the pole mount sockets and provides five attachment points for rigging purposes The 2 loudspeaker is used with an approved digital processor with OEM factory presets for active 2 way operation or 3 way operation in conjunction with additional subwoof
15. 25 Hz 250Hz ts 500 Hz in E kHz 2 kHz 4 kHz Figure 12 SPL mappings at octave band frequencies for two XT enclosures with 0 5 metre spacing arrayed system corresponding to the works case shown in Figure 14 Figure 13 shows SPL mappings for a distributed system of two XT enclosures with a spacing of 3 meters Interference now occurs lower in frequency and will tend to be masked by room reverberation Compared with the closely spaced arrayed system of Fig 12 there is now improved intelligibility at higher frequencies Essentially the key to successful distributed system design is reducing the effects of audible interference n c B E k kHz 2 kHz 4 kHz Figure 13 SPL mappings at octave band frequencies for two XT enclosures with 3 metre spacing distributed system corresponding to the best case shown in Figure 14 L ACOUSTICS XT Manual V1 1 2 11 2003 28 5 Figure 14 General guidelines for arraying XT enclosures The avoid case corresponds to the SPL mappings shown in Figure 15 works corresponds to Figure 12 and best corresponds to Figure 13 125 Hz 250 Hz 500
16. Hz Components LF high pass filter x 15 weather resistant loudspeaker 3 voice coil HF 1 1 4 exit compression driver titanium diaphragm 3 voice coil coaxial assembly Enclosure Height 580 mm 22 8 in Front Width 440 mm 7 3 in Rear Width 67 mm 6 6 in Depth 475 mm 18 7 in Trap Angle 4 degrees with respect to vertical Net Weight 29 5 kg 65 Ibs Shipping Weight 33 2 kg 73 2 lbs Shipping Dimensions 655 x 500 x 5 0 mm 25 8 x 19 7 x 22 4 in Connectors 2x 4 pin Neutrik speakon Material 18 mm 30 mm Baltic birch plywood sealed screwed and rabbeted angles Finish Maroon gray Grill Black epoxy perforated steel with acoustically transparent foam Rigging Integrated flying hardware handles and pole mount socket L ACOUSTICS XT Manual V1 1 1 02 03 47 580 580 LEFT SIDE RIGHT SIDE TOP amp BOTTOM 456 580 REAR SCALE 1 15 Dimensions in mm Figure 26 115 Line Drawing L ACOUSTICS XT Manual VI 11 02 03 48 N m SEY 1 SI A 8 n c D xl x d a _ pet position 1 14 1 77 7 position 2 7 position 20 position gv A em 580 Figure 28 115XT XTLIFTBAR Line Drawing L ACOUSTICS XT Manual VI 1 02 03 49 CN Ey
17. Hz kHz 2 kHz 4 kHz Figure 15 SPL mappings at octave band frequencies for four XT enclosures with 0 5 metre spacing arrayed system corresponding to the avoid case shown in Figure 14 L ACOUSTICS XT Manual V1 1 2 11 2003 29 4 4 PREDICTING XT COVERAGE Polar data files are available for modeling 12 and 115 coverage using industry standard EASE or CATT Acoustic room acoustics modeling software packages see Figures 11 13 for examples of typical SPL mappings For more information on these modeling programs please consult www ada acousticdesign com for EASE information www catt se for CATT 12XT and 115 polar data EASE or CATT format is available for download from www l acoustics com 4 5 DISTRIBUTED SOUND REINFORCEMENT As seen in Figure 13 distributed sound reinforcement using XT enclosures can provide even SPL coverage and frequency response by reducing the effects of audible interference For distributed installation the optimum spacing between enclosures will depend on the coverage angle of the enclosure 90 degrees for 2XT 80 degrees for 15 as well as the distance to listener 4 5 1 OVERHEAD DISTRIBUTED SYSTEMS Overhead distributed system design using coaxial loudspeakers is described in Davis and Davis Sound System Engineering 2 4 Edition Focal Press 1997 In this reference it is shown that an overhead crisscross pattern distribution density with center to center overlap provides t
18. MLS switch settings for powering 15XT II 5XT LO SECTION I 15XT HI SECTION L ACOUSTICS XT Manual 2 11 2003 5 L ACOUSTICS 15 MATRIX MLS SWITCH SETTING LOAD CONFIGURATION 16 ohms Quad 4 channel 8 ohms Quad 4 channel 4 ohms Quad 4 channel 2 7 ohms Quad 4 channel 2 ohms Quad 4 channel L ACOUSTICS LA 24 POWER MATRIX MLS SWITCH SETTING LOAD CONFIGURATION 448 248 16 ohms Stereo 2 channel 8 ohms Stereo 2 channel 4 ohms Stereo 2 channel 2 7 ohms Stereo 2 channel 2 ohms Stereo 2 channel i L ACOUSTICS LA 17a POWER MATRIX MLS SWITCH SETTING LOAD CONFIGURATION 16 ohms Stereo 2 channel 8 ohms Stereo 2 channel 4 ohms Stereo 2 channel 2 7 ohms Stereo 2 channel 2 ohms Stereo 2 channel L ACOUSTICS LA 48 POWER MATRIX 16 ohms Stereo 2 channel 8 ohms Stereo 2 channel 4 ohms Stereo 2 channel 2 7 ohms Stereo 2 channel 2 ohms Stereo 2 channel Table 9 Output Power Ratings MLS Switch Settings for LLACOUSTICS LAa Amplifiers L ACOUSTICS XT Manual 2 11 2003 MLS SWITCH SETTING LOAD CONFIGURATION 5dB 4488 248 2 3 CONNECTORS AND 12XT and 115 are supplied with dual NL4 Speakon connectors The two Speakon connectors are internally wired in parallel allowing for loop through connection and para
19. Time alignment of complementary fill systems with the main left right FOH arrays is necessary in order to achieve optimum results Placing your measurement microphone in a representative location where the fill and main system coverage overlaps generally provides a good reference point for time alignment WINMLS SMAART or SPECTRAFOO are cost effective measurement tools that are recommended for this purpose 4 6 FRONT OF HOUSE FOH APPLICATIONS When 112 or II 5XT enclosures are used standalone without subwoofers for FOH applications there are two different types of 2 way preset available 1 FRONT presets have 3 dB of low and high frequency shelving equalization in order to provide a frequency response contour that is suitable for music applications 2 FILL presets have nominally flat response for use in speech reinforcement and classical music applications or for when XT enclosures are used as a close proximity fill enclosure For 3 way operation of 112 115 loudspeaker enclosures with 58115 58118 58218 or dV SUB subwoofers there are two different types of preset available 1 3W presets optimize the power bandwidth for the XT and its companion subwoofer due to the use of complimentary 100 Hz crossover filtering and are recommended for all closely coupled applications for example stacked configurations 2 3WX presets can be employed when XT enclosures and subwoofers are physically separated for example flown XT enclosures a
20. compression driver SUBWOOFER ENCLOSURES 3 58115 Front loaded bass reflex design single 15 subwoofer for low frequency extension 4 58118 Dual vented bandpass loaded single 18 subwoofer for high level extended bandwidth 5 SB218 Front loaded bass reflex design dual 18 subwoofer for high level extended bandwidth 6 dV SUB Dual vented bandpass loaded triple 15 subwoofer for high level low frequency extension For more information concerning 581 15 58118 and 58218 subwoofer enclosures please consult the SB Subwoofer User s Manual L ACOUSTICS XT Manual V1 1 2 11 2003 6 XT RIGGING ACCESSORIES 7 ETRII2XT Adjustable U Bracket for ceiling wall or scaffold mounting of the 2XT in either horizontal or vertical orientations 8 CPLII2XT Coupling adapter bars used in conjunction with ETRII2XT to array two I2XT enclosures vertically with independent tilt adjustment for both enclosures 9 ETRIISXT Adjustable U Bracket for ceiling wall or scaffold mounting of the I5XT in either horizontal or vertical orientations 10 115 Coupling adapter bars used in conjunction with ETRII5XT to array two 115 enclosures vertically with independent tilt adjustment for both enclosures XTLIFTBAR Allows for single point rigging of 1 12 or 115 loudspeaker enclosures with 5 pick points available for tilt adjustment 12 PION 2 Double stud Aeroquip flytrack fitting to ring for permanent installation
21. dV SUB subwoofers Perform the following steps as a system check turn down the level of all amplifier channels before turning the amplifiers on 2 un mute the HIGH crossover channel 3 send a pink noise signal to the crossover 4 turn up the level of each HIGH amplifier channel individually and check that this provides the expected frequency band in the expected loudspeaker component Test each HIGH amplifier channel individually until all HIGH amplifier channels have been tested 5 mute the HIGH crossover channel 6 repeat steps 2 5 for LOW and SUB channels 7 turn off the pink noise Set all amplifier output levels to O dB gain Un mute all crossover output channels and the system is ready for use Remember the old saying amps on last amps off first in order to avoid component damage due to power on off transients 6 1 RECOMMENDED MAINTENANCE PROCEDURES a HF diaphragm replacement To access the HF compression driver diaphragm the front grille of the XT enclosure should be removed and the entire 12 or 15 coaxial assembly de mounted To remove the front grille lift the edges of the acoustic foam and remove the screws Screws can be found where the edges of the foam are not glued onto the grille there is no need to completely remove the acoustic foam in order to remove the loudspeaker grille Once the coaxial assembly has been de mounted unscrew the back cover of the rear mounted compression driver assembly to obta
22. front baffle of the I5XT is oriented at a 41 degree angle with respect to vertical allowing the enclosure to be used as a floor monitor Enclosure weight is 29 5 kg 65 0 Ibs Cabinet construction consists of 30 mm 1 18 in and 18 mm 0 70 in Baltic birch plywood with internal steel bracing and joints that are sealed screwed and rabbeted The finish is maroon gray high resilient paint The front of the enclosure is protected by a black powder coated 1 5 mm 0 06 in thick steel grill that is covered with 10 mm 0 39 in thick acoustically transparent open cell foam The 115 has two side recessed flytrack sections and 36 mm 1 42 in diameter pole mount sockets mounted the top and bottom sides Pole mount sockets function with the ETRIIS5XT U bracket accessory for rigging the enclosure in either horizontal or vertical orientations providing angular adjustment with 10 degree resolution Two CPLII5XT coupling adapter bars can also be used conjunction with the ETRII5XT U bracket allowing two 115 enclosures to be flown vertically while providing independent tilt adjustment for each enclosure The XTLIFTBAR accessory functions with either of the pole mount sockets and provides five attachment points for rigging purposes The 115 loudspeaker is used with an approved digital processor with OEM factory presets for active 2 way operation or 3 way operation in conjunction with additional subwoofers L ACOUSTICS SBII5 5 18 SB218
23. high section 13 Table 4 Recommended MLS switch settings for powering 1 2XT 14 Table 5 Load and Power Ratings for I 5XT eene eene 14 Table 6 Recommended power amplification and MLS switch settings for 5XT low section 15 Table 7 Recommended power amplification and MLS switch settings for 5XT high section 15 Table 8 Recommended MLS switch settings for powering 5XT 15 Table 9 Output Power Ratings and MLS Switch Settings for L ACOUSTICS LAa Amplifiers l6 Table 10 Maximum Recommended Length for Damping Factor gt 20 7 Table 11 Nominal floor monitor distance and monitor separation versus performer height 33 Table 12 LLACOUSTICS Subwoofer Specification Summary 34 L ACOUSTICS XT Manual V1 1 2 11 2003 4 0 INTRODUCTION Effectively covering an audience is the goal of any sound reinforcement system design This is straightforward in small spaces where left right stereo configuration is suitable provided that the available power is sufficient i e a stereo pair of loudspeakers is a relatively easy system to install and the result
24. listening positions the off axis attenuation at higher frequencies provides a similar tonal balance and the attenuation with distance is less The coaxial configuration therefore provides the optimum directivity required in order to obtain even coverage and constant tonal balance in a typical semi reverberant auditorium Extensive sound design and installation experience acquired by L ACOUSTICS over the years confirms this and we are confident that coaxial axi symmetric loudspeaker enclosures are the best tools for multiple source distributed sound design The coaxial performance of the 1 I2XT and 115 loudspeaker enclosures provide the basic starting tools for distributed sound reinforcement design I THE XT SYSTEM The XT line consists of I2XT 115 loudspeaker enclosures XT rigging accessories and SBI 15 SBII8 SB218 or dV SUB subwoofers OEM factory presets are provided for approved digital signal processors XTA DP224 DP226 and BSS 366 Please note that amplifier racks plus loudspeaker cables are not specified but should meet the minimum specification requirements outlined below XT SYSTEM COMPONENTS LOUDSPEAKER ENCLOSURES 1 12XT Active 2 way coaxial loudspeaker with 90 degree axi symmetrical coverage containing 12 loudspeaker 4 exit high frequency compression driver 2 1 15XT Active 2 way coaxial loudspeaker with 80 degree axi symmetrical coverage containing 15 loudspeaker 4 exit high frequency
25. of 112 or II5XT enclosures or for use in conjunction with ETRII2XT or ETRIISXT as a safety attachment LOUDSPEAKER CABLES 13 F CABLE SP7 SP25 Loudspeaker cable 4 conductor 4mm conductor cross section 7 m 20 ft or 25 m 80 ft length equipped with 2 x Speakon connectors 14 F LINK CABLE SP 7 Loudspeaker link cable 4 conductor 4mm conductor cross section 0 7 m 2 ft length equipped with 2 x Speakon connectors for paralleling XT enclosures L ACOUSTICS XT Manual V1 1 2 11 2003 7 ETRII2XT ETRII5XT CPLII5XT F CABLE DO7 F LINK CABLE DO 7 Figure 1 XT System Components L ACOUSTICS XT Manual VI 2 11 2003 I 2 XT OVERVIEW L ACOUSTICS 112 or 115 loudspeaker enclosures are intended for distributed sound reinforcement and can be used for either high performance touring or fixed installation Both XT loudspeaker enclosures feature highly advanced coaxial components and rigging accessories while also benefiting from the flexibility afforded by digital presets The I2XT is an active 2 way loudspeaker containing a 1 4 exit compression driver that is directly loaded by the 12 loudspeaker a coaxial configuration while the 115 features 15 loudspeaker As discussed in the introduction advantages of the coaxial approach include single point source radiation and excellent phase response total wavefront coherency at all frequencies and axi symmetrical directivity that pro
26. or dV SUB Figure 3 115 XT Enclosure L ACOUSTICS XT Manual VI 1 2 11 2003 2 POWERING XT It is important that power amplifiers with sufficient power are used to power the I2XT or 115 since headroom is less likely to damage loudspeaker components than clipping Apart from normal standards regarding construction protection cooling and damping factor that are expected of any professional sound reinforcement amplifier the XT system has been calibrated to be used with amplifiers with the following specifications GAIN STRUCTURE All amplifiers should have 32 dB gain for all sections sub low and high The limiter thresholds and output channel gains of OEM digital crossover presets have been adjusted to be used with amplifiers having 32 dB gain LIMITERS Peak limiters on all amplifier outputs with soft clipping characteristics attack time less than 3msec COOLING Temperature speed controlled fan recommended In practice L ACOUSTICS specifies power amplifiers with output power equivalent to twice the RMS power handling for the low section and equivalent to the peak power handling for the high section These requirements typically allow the same amplifier to be used for both sections since the drive level for the HF section is attenuated relative to the LF section to account for efficiency differences i e full continuous power will never be delivered to the HF section due to this attenuation When the same amplifier is us
27. or horizontal orientations coupling adapter bars for vertical coupling of two XT enclosures independent tilt adjustment for each enclosure and the XTLIFTBAR accessory for single point rigging 5 pick points available allowing for tilt adjustment L ACOUSTICS XT Manual VI 2 11 2003 9 I 3 2 SPECIFICATIONS The I2XT is an active two way coaxial full range loudspeaker containing one direct radiating bass reflex loaded 12 inch low frequency transducer and one 1 4 inch exit 3 inch voice coil diameter titanium alloy diaphragm compression driver As a full range system the frequency response is 65 Hz to 18 kHz with less than 3 dB variation and the usable bandwidth is 55 Hz to 18 kHz 10 dB The cone body of the low frequency component provides pattern control loading of the compression driver and yields a 90 degree 20 degrees conical dispersion pattern that is axi symmetrical The crossover point between low and high frequency components is kHz with 24 dB per octave Linkwitz Riley characteristics Long term power handling is 290 Wrms for the low section and 135 Wrms for the high section at a nominal 8 ohm impedance Connection to the loudspeaker is made two parallel 4 pin Neutrik Speakon connectors The 112 has a truncated wedge shape with a curved front profile Dimensions 54 cm 21 3 in high 41 cm 16 1 in wide at the front of the enclosure 16 5 cm 6 5 in wide at the rear of the enclosure and 37 5 cm
28. 12 s CPLII2XT angle has been set and middle locking accessories can be used for installation of safety security steels pins installe Figure 19 CPLI I2XT CPLII15XT coupling adapter installation procedure L ACOUSTICS XT Manual V1 1 2 11 2003 39 5 3 XTLIFTBAR The optional XTLIFTBAR accessory allows for single point rigging of 1 2XT or 115 loudspeaker enclosures with 5 pick points available for tilt adjustment Pick point holes from front to back provide tilt angles of 14 7 0 7 or 14 degrees for either 112 or 115 2 The XTLIFTBAR mounting stud mates with 1 2XT or I I5XT pole mount sockets top or bottom 1 XTLIFTBAR and the I2XT enclosure 3 When installing XTLIFTBAR ensure that the main section is aligned with the center of the enclosure in order to properly balance the center of gravity The flytrack section and PION2 optional accessory can be used to install a safety steel 4 Two locking pins are used to secure the XTLIFTBAR Changing the shackle location provides tilt angles of 14 7 0 7 14 degrees front to back Figure 20 XTLIFTBAR installation procedure 5 4 SAFETY RULES Always ensure that the ETRI I2XT or ETRI I5XT rotating arm is securely fastened by verifying that the spring loaded locking pin at the pivot point is correctly seated before adjusting the tilt angle of the 2 or 15 When using ETRI I2XT or ETRIISXT the vertical orie
29. 58118 I5XT 3W 58218 I5XT 3WX SB218 I5XT 3W dV SUB 5 3WX dV SUB N 3 way stereo 58115 58118 58118 58218 58218 dV SUB dV SUB 58115 SBI 15 58 118 58 118 58218 58218 I 12XT LOW I2XT LOW LOW I2XT LOW 12XT LOW I2XT LOW I2XT LOW I1 5XT LOW A I1 5XT LOW I1 5XT LOW A 115XT LOW 115 LOW 115 LOW 15XT LOW 115XT LOW 115XT LOW dV SUB A 115XT LOW 15XT A dV SUB A I 15XT LOW 15XT A Figure 5 LLACOUSTICS preset library for XTA DP226 112 HI A 112 A 112 HI A 112 HI A 112 A 12XT A 112 HI A 5XT HI A 15 HI A 5XT HI A 15XT A 15XT 15XT A 15XT A 15 A 15XT A 58 1 15 B 58 118 58 118 58218 58218 dV SUB dV SUB FULL B FULL B FULL B 115 58 1 15 B 58 118 58 118 58218 58218 dV SUB dV SUB 12XT LOW B 12XT LOW B 12XT LOW B 12XT LOW B 12 LOW B 12XT LOW B 2 LOW B I 15XT LOW B 15 LOW B I1 5XT LOW B 1 15XT LOW B 15XT LOW B 15XT LOW B 15XT LOW B 15XT LOW B I5XT LOW B 115 LOW B 15XT LOW 12XT HI B I2XT HI B 112 HI B 112 HI
30. B I2XT HI B 112 HI B I2XT HI B HI B HI B 5XT HI B 15XT HI B 15XT HI B 15XT HI B 15XT HI B I5XT HI B 115XT HI B 15XT B I5XT HI B N 3 way stereo 3 way stereo 3 way stereo 3 way stereo IN 3 way stereo 3 way stereo 2 3 way stereo 3 way stereo not linked 35 Ww O 19 3 way stereo 3 way stereo 3 way stereo 39 3 way stereo 3 way stereo N 3 way stereo 3 way stereo 43 ACOUSTICS XT Manual V1 1 2 1 1 2003 2l L ACOUSTICS V7 0902 PRESETS for XTA DP 224 MEM OUT Source OUT 2 Source OUT 3 Source OUT 4 Source csv o ARCS 2W LO ____2 10 ARCS LO A ARCS HI A ARCS LO B ARCS HI B ARCS 2W HI ___ 2 ARCS LO ARCS HI A ARCS LO B ARCS HI B il iii i F z ri ARCS 3W 218 LO 3 way A SUB B 218 ARCS LO ARCS HI A SB218 B ARCS 3W 218 3 way A SUB B 218 ARCS HI SB218 B ARCS 3W dVSUB LO 3 way A SUB B dV SUB A ARCS LO A ARCS HI A dV SUB B ARCS 3W dVSUB HI 3 way A SUB B dV SUB A ARCS LO A ARCS HI A dV SUB B Z Z o ZZ D Z 44275 TT 2 2 F gt f_ CT ___ 7 I 15FM 2W COUPLED 2 way stereo not link
31. B 3 way A SUB B 3l SB218 A I 15XT LO 15XT A SB218 B 3 way A SUB B 32 SB218 A 15XT LO 15 5 218 3 33 dV SUB 15XT LO 15XT HI A dV SUB B 34 dV SUB A 15XT LO I5XT HI A dV SUB B 12 3W SBI 15 3 way A SUB B 20 SB218 A 112 LO 12XT HI SB218 B 12 3WX 5 218 3 way SUB 15 2W FRONT 2 way stereo 2 115XT LO 115 115XT LO B 115XT HI B 15 3W SBI18 3 way A SUB B 30 5 118 A 115XT LO A 15 HI A SBII8 B 15 3WX dV SUB 3 way A SUB B Figure 7 L ACOUSTICS preset library for BSS FDS 334 Minidrive L ACOUSTICS XT Manual 1 2 11 2003 23 L ACOUSTICS V7 0103 PRESETS for BSS 336 MINIDRIVE RESET NAME PRESET NAME PGMTYPE Mem OUT Source OUT2 Seuce OUT3 Seure OUT4 Seuce OUTS Source Source ARcs2wio 309438 FULL ARCSLOW ue ARCSHIB ARC 21810 ARCdVSHI 3040830 ARCSLOW 2W SEM LOW A 2Wx 5 mua _IISEMHI A rise ow 115 Hi 8 msns sbre mowa imha TISFM HI B 8 309 38 o sensa IFMLOW 58218 5 2
32. HI A ARCS LOW B ARCS HI B ARCS LOW ARCS HI C 2 A 2 B 2 C ARCS LOW A ARCS HI A ARCS LOW B ARCS HI B ARCS LOW C ARCS HI C 2 60 2 2 0 lISFMLOWA emaa _lISFMLOW 8 IDEMLOW O IMHO SFM HI 2 2 2 LISFM LOW A LOW B JUXTLOW O I2XT FIL 2 A 2 B 2 C 41 II2XTLOW 112 LOW B 12XT HI B 12XT HI B 4l 2 A 2 B 2 C 42 L12XT LOW 12XT LOW B I2XT MON 2 2 2 LOW 112 LOW 4 HI B 5 15 HI B 6 HI B ARC dVS HI I5FM 2WX M SBII8 M SB218 M dVSUB I2XT FIL n m gt lt 12 3 A 3 3 A 3 B 3 A 3 B 3 A 3 B 3 A 3 B 3 A 3 B 3 A 3 B 12 115 1258118 12 118 12 58218 12 218 21 22 N X I 15 MON 15 115 15 58118 15 118 UJ gt UJ A Uu lt WW WT I5XT FIL 2 2 2 15 LOW I I5XT LOW 2 A 2 B 2 C 115 LOW A LOW B 2 A 2 B 2 C 15 LOW 15 LOW B Figure 9 L ACOUSTICS preset library for BSS FDS 366 Omnidrive Compact Plus L ACOUSTICS XT Manual 2 11 2003 25 4 SOUND DESIGN 4 1 APPLICATIONS The art of designing a sound system is a profession in itself and a complete description of all s
33. R presets compensate for these two half space loading effects and provide a frequency response curve that is nominally flat Subjectively low frequency half space loading compensation provides a high degree of warmth and body to vocals while the flat high frequency response that has been engineered for the MONITOR preset provides excellent fidelity and feedback resistance Since the overall MONITOR response curve is nominally flat simple adjustments to the relative output gains between high and low channels allow the monitor engineer to quickly adjust the overall response contour to obtain more vocal presence as desired Power response is very even and stable due to the axi symmetric directivity of the coaxial component configuration and this results in improved coverage and feedback resistance When using XT enclosures in pairs for floor monitoring the same principles apply as for overhead or distributed front fill systems i e the optimum spacing between floor monitors will depend on the coverage angle of the enclosure 90 degrees for I2XT 80 degrees for 115 and the throw distance to the performing artist which is determined by the floor monitor angle with respect to vertical and the artist s height Center to center overlap will provide the most uniform coverage and as a guideline nominal monitor distance plus monitor separation is tabulated below in Table 11 Table 11 Nominal floor monitor distance to performer and monitor separ
34. SC products which are intended for medium to large scale sound reinforcement applications However in most cases it is not feasible to meet WST criteria while at the same time having a sufficient level of versatility for small to medium scale applications In other words if a product is to be arrayable it typically leads to an enclosure design that cannot be used in single or very small configurations A different set of loudspeaker enclosure design specifications apply that are more suited to the multiple source sound design approach The L ACOUSTICS approach to distributed sound reinforcement using multiple sound sources starts with the specification that each individual loudspeaker enclosure should behave as a totally coherent source This criterion can be achieved using coaxial components which are well suited to the design of highly versatile small format systems The use of coaxial components has been popularized over the years by a famous British manufacturer for studio monitoring applications to the best of our knowledge L ACOUSTICS was the first manufacturer to use coaxial technology in professional sound reinforcement applications and the current XT line is a continuation of the heritage that was introduced in 1989 Coaxial dual concentric components provide a smooth transition between the LF and HF sections since by definition the directivity of the two transducers is matched at the crossover frequency In addition the directiv
35. SUB B SB218 A 15 LO A 15 HI 218 I15XT 3WX 58218 3 way A SUB B SB218 A I 15XT LO 15XT HI A SB218 B I 15XT 3W dV SUB 3 way A SUB B dV SUB A 15 LO A 15 dV SUB I 5 3WX dV SUB 3 way SUB B dV SUB A 15 LO A HI A dV SUB B Figure 6 LLACOUSTICS preset library for XTA DP224 L ACOUSTICS XT Manual 1 2 11 2003 22 L ACOUSTICI L ACOUSTICS V7 0103 PRESETS for BSS 334 MINIDRIVE PRESETNAME PGM TYPE MEM OUT Source OUT 2 OUT3 Source OUT 4 Seurce Zi SEE 2W LO 2 way stereo ARCS LO A ARCS HI A ARCS LO B ARCS HI B ARCS 2W 2 way stereo ARCS LO A ARCS HI A ARCS LO B ARCS HI B kapa ww 3 way A SUB B 218 A ARCS LO A ARCS HI A SB218 B 3 way A SUB B 218 HI SB218 3 way A SUB dV SUB A ARCS LO A ARCS HI A dV SUB B 3 way A SUB B dV SUB A ARCS LO A ARCS HI A dV SUB B I I5FM LO I5FM HI A 5 LO B 115 HI B I5FM 2W COUPLED 2 way stereo not linked I5FM 2WX SINGLE 2 way stereo not linked I 15FM LO A I HI A LO B 58115 A A SBII5 B 5 118 I I5FM LO I5FM HI 58118 B 3W 5 115 3 way SUB 3 way
36. T HI 58118 B 12 3WX 58118 3 way A SUB B SBII8 A I 12XT LO 12XT HI 5 118 B I 12XT 58218 3 way A SUB B SB218 A I I2XT LO A 2 HI SB218 B 12 3WX 58218 3 way A SUB B SB218 A I 12XT LO HI A SB218 B I 12XT 3W dV SUB 3 way A SUB B dV SUB A I I2XT LO A I2XT HI dV SUB B 112 3WX dV SUB 3 way A SUB B dV SUB A I 12XT LO 12XT HI dV SUB B a sn E eee 6 ee ee Hil aage C MEG ee ee T r SSE I 15XT 2W FILL 15 LO A 15 HI A 15XT LO 15XT HI B I15XT 2W FRONT I I5XT LO 15 15XT LO B 15XT HI B I15XT 2W MONITOR 2 way stereo not linked LO HI LO B 15XT HI B i P CG x m u Z s a UM C CM i EEE 15 58115 3 way A SUB B 36 58115 A 115XT LO 15 58 15 15 3WX SBI 15 3 way SUB 58115 15 LO 15XT HI A 581 15 5 3W 58118 3 way A SUB SBII8 15 LO 15 HI 118 B 15 3WX 118 3 way SUB 58118 15 LO A 15 HI A 58118 5 3W 58218 3 way A
37. URES Due to their controlled directivity behavior XT enclosures should be aimed so as to geometrically cover the desired audience area with the main zero degree axis roughly orientated towards the middle or rear of the audience area Since the wavefront radiated by an axi symmetric sound source has directivity that is smoothly increasing with frequency this helps to match coverage frequency response and SPL to the acoustic environment of a typical auditorium Normally the reverberation time in auditoria decreases smoothly above kHz and at greater distances in the venue the low frequency energy is fairly constant due to the reverberant field Loudspeaker focus or aiming should be adjusted so that maximum HF energy is directed towards the farthest listening areas this helps to balance the SPL attenuation with distance that occurs in the direct field At closer listening positions the off axis attenuation at higher frequencies provides a similar tonal balance and the overall SPL attenuation with distance is less Although XT enclosures have controlled directivity attenuation properties it is important not to have the closest members of the audience too close to the system i e in order not to produce excessive sound pressure levels up close Ideally the ratio between the shortest and the furthest distance covered should not exceed 1 4 and in order to achieve this it is often desirable to fly the system However when XT enclosures are flown a
38. Version 1 1 February 2003 L ACOUSTICS XT LINE 12 115 OPERATOR MANUAL LACOUSTIC3 FOREWORD Thank you for purchasing the 12 or 115 sound reinforcement system This manual is intended to provide you with the information you require to install and operate your XT loudspeaker enclosure in a wide variety of professional sound reinforcement applications Specific information and recommendations are included regarding system design sound design and installation We are confident that the information provided in this manual will be sufficient for most applications however should you require further assistance your distributor or L ACOUSTICS are available to provide additional technical support MANUAL ORGANIZATION The Introduction gives a brief presentation of coaxial technology and the XT system Chapter introduces the 112 and 15XT loudspeaker enclosures plus accessories Chapter 2 discusses 2 and 115 power amplification and cabling Chapter 3 describes preset selection and system operation Chapter 4 discusses sound design aspects Chapter 5 describes 2XT or 15XT installation procedures Chapter 6 discusses XT system operation and maintenance procedures Chapter 7 gives 2 and I5 XT specifications L ACOUSTICS XT Manual V1 1 2 11 2003 L ACOUSTICS XT Manual V1 1 2 11 2003 TABLE OF CONTENTS FOREWORD yuy S aus eE a
39. are for standalone FOH operation without subwoofers where low and high frequency shelving equalization provides a frequency response contour suitable for music applications FILL presets provide nominally flat response for use in speech reinforcement and classical music applications or when XT enclosures are used as a close proximity fill enclosure Both FRONT and FILL presets are derived under freefield measurement conditions MONITOR presets include additional low frequency equalization to account for half space loading conditions and are intended for floor monitoring applications or fixed installations where the XT is wall or ceiling mounted MONITOR presets are derived under half space measurement conditions A variety of 3 way presets are provided for use of the 1 12 or I 15XT with 58115 58118 SB218 or dV SUB subwoofers Standard 3W presets utilize a complimentary 100 Hz crossover point for the XT and its companion subwoofer and are recommended for closely coupled applications Alternatively when XT enclosures are flown and subwoofers are ground stacked 3WX presets can be employed where 80 Hz low pass filter is applied to the subwoofers and 112 or 115 low frequency response extends to 55 or 50 Hz respectively Pole mount sockets and side mounted fly track sections are included as standard on XT enclosures and optional rigging accessories include an adjustable U bracket for ceiling wall or scaffold mounting vertical
40. ate Preset Description Sheet excel XLS files to assist in selecting the appropriate preset and as a reference for properly configuring crossover output channels for your drive rack or signal distribution system Complete Preset Description Sheet excel files are available for download from www l acoustics com along with preset library data As a quick reference Figures 5 9 give channel assignments for XTA DP226 DP224 and BSS 334 336 366 respectively L ACOUSTICS XT Manual VI 2 11 2003 20 LACOUSTIC3 L ACOUSTICS V7 0902 PRESETS for XTA DP 226 PGM TYPE OUT Source OUT 2 Source OUT 3 Source OUT 4 Source OUT 5 Source OUT 6 Source FULL A ARCS LOW A ARCS HI A FULL B ARCS LOW B ARCS HI B FULL A ARCS LOW A ARCS HI A FULL B ARCS LOW B ARCS HI B SB218 A ARCS LOW A ARCS HI A SB218 ARCS LOW B ARCS HI B SB218 A ARCS LOW A ARCS HI A SB218 B ARCS LOW B ARCS HI B dV SUB A ARCS LOW A ARCS HI A dV SUB B ARCS LOW B ARCS HI B dV SUB A ARCS LOW A ARCS HI A dV SUB B ARCS LOW B ARCS HI B FULL A I I5SFM LOW ISFM HI A FULL B LOW B FULL A LOW A FULL B LOW B 15FM HI B SBII5 A LOW I 5FM HI A 58 115 LOW HI B SBII8 A I5FM LOW I 5FM HI SBII8 B I LOW 15FM HI B SB218 A LOW I 5FM HI A SB218 B LOW II 5FM HI B
41. ation versus performer height I 12XT 45 deg angle wrt vertical 90 deg coverage PERFORMER HEIGHT Performer lt gt Monitor Monitor lt gt Monitor cm ft in cm ft in cm ft in PERFORMER HEIGHT Performer lt gt Monitor Monitor lt gt Monitor cm ft in cm ft in cm ft in Apart from separation and distance to the performer the last issue to consider when using 112 or as floor monitors in paired configurations is whether to angle them in towards the performer Although it looks more rock and roll and gives the performer the impression of having more SPL it is generally not advised to angle wedges in but to use them with the front faces parallel to each other Essentially angling in wedges no longer provides optimum center to center overlap and results in too much overlap Due to this excessive overlap there will be a cancellation loss of up to 8 dB in the high end above 6 kHz approximately that will need to be compensated for via output gain adjustment and or equalization Ultimately it all comes down to artist preference and what you re shooting for in a monitor mix but if you want optimum coverage and nominally flat follow the spacing distance recommendations above and don t angle the wedges in L ACOUSTICS XT Manual 2 11 2003 33 SIDE FILL OR DRUM FILL MONITORING When used in conjunction with SBII5 SBII8 SB218 or dV SUB subwoofers 112 or 115 enclosures prov
42. dV SUB A I5FM LOW I 5FM A dV SUB B I ISFM LOW B I 5FM HI 0 A m 2 gt m ARCS 2W LO ARCS 2W HI ARCS 3W SB218 LO ARCS 3W SB218 HI ARCS 3W dV SUB LO ARCS 3W dV SUB HI II5FM 2W COUPLED 3 way stereo not linked I5FM 2WX SINGLE IISFM 581 15 3 way stereo 58118 3W SB218 I5FM 3W dV SUB 3 way stereo 3 way stereo 3 way stereo 3 way stereo 3 way stereo 3 way stereo 3 way stereo not linked I7 3 way stereo 20 21 3 way stereo 3 way stereo I l2XT2W FILL 3 way stereo 22 FULL A 112 LOW I2XT HI A FULL B 12 LOW B I2XT HI B 12 2W FRONT FULL A 12 LOW 12XT HI A FULL B 12 LOW B 112 HI B 2 2W MONITOR 3 way stereo not linked FULL A 12 LOW A 112XT A FULL B I 12XT LOW 112XT HI B a 2 EZ RIDENEGE IERI noma 12 58115 3 way stereo 25 SBII5 112 LOW I2XT HI A SBII5 B 12 LOW B 112XT HI B I2XT 3WX SBII5 I2XT 3W 58118 I2XT 3WX 58118 I2XT 3W SB218 I2XT 3WX SB218 I2XT 3W dV SUB 2 3WX dV SUB 115XT 2W FILL 3 way stereo 5 2 FRONT 115XT 2W MONITOR 115XT 3W SBII5 3 stereo I5XT SBII5 I5XT 3W 58118 I5XT 3WX
43. duces identical horizontal and vertical coverage Coaxial design also provides LF HF superimposed dispersion characteristics that are free of polar lobing effects typical of traditional horn and woofer combinations The end result is natural studio monitor level sound quality ideal for proximity use and perfectly matching semi reverberant environments The I I2XT or 1 15XT are ideal for distributed sound reinforcement and can also be used in medium power front of house FOH applications for theatres clubs multi purpose venues or corporate events Examples of distributed systems include delay rings for large scale installations surround effects channels for theatre or multimedia distributed reinforcement for sports venues and delays for speech reinforcement in convention centre ballrooms Although optimized for single operation 12XT or 115 loudspeakers be used in vertical arrays of two enclosures to enhance either SPL or coverage Due to their compact wedge shaped format and axi symmetrical directivity XT enclosures also provide an exceptionally high performance floor monitor solution When used with the SBII8 or other L ACOUSTICS subwoofers XTs are also excellent for side fill and drum monitoring applications OEM factory presets are available for approved digital processors providing flexible solutions for a wide variety of 2 and 3 way operating modes For 2 way operation three types of presets are provided FRONT presets
44. e delayed sources and produces more homogeneous SPL over the delay covered area 3 Distributed delay positions should be along a circular arc of constant radius centered at the stage 4 The optimum spacing between delay loudspeakers will depend on the coverage angle of the enclosure 90 degrees for I2XT 80 degrees for 115 as well as the distance to first members of the audience Center to center overlap will provide the most uniform coverage see also 4 5 1 Time domain based measurement equipment is essential for setting delay times for example MLSSA WINMLS TEF SMAART or SPECTRAFOO Alternatively Bushnell Yardage Pro rangefinder binoculars can provide a good starting point by simply measuring the distance from the delay location to the main system i e the geometric path difference L ACOUSTICS XT Manual VI 2 11 2003 30 4 5 3 COMPLEMENTARY FILL For large scale sound reinforcement typically when V DOSC dV DOSC or ARCS are used as the main FOH system XT enclosures can be used for distributed front fill ground stacked flown center cluster downfill stereo in fill offstage fill or as distributed delays The number of potential uses for 12 or I 15XT enclosures for fill applications is only limited by your imagination In all cases proper time alignment of fill systems with respect to the main L R FOH system is essential for obtaining optimum results Similarly pre delay to time align the overall sound reinforcem
45. e done using band attenuation subwoofer time alignment and system equalization using input section parametric filters not by altering presets for the following reason Without proper instrumentation and spatial averaging adjustments made at one location e g the mix position are not optimum at all other locations within the defined coverage region of the system When made by ear such adjustments are often misguided the user may be in a local room mode low frequency pressure maximum or minimum and or may be hearing a cancellation or addition due to crossover misalignment that sounds good at that specific location but what about all others Meanwhile the same result could have been achieved while preserving the power response of the system by using the correct crossover preset and a simple equalization cut or correct time alignment of subwoofers Preset libraries are distributed via PCMCIA Card which are available from L ACOUSTICS headquarters in France LLACOUSTICS US L ACOUSTICS UK or your L ACOUSTICS distributor Preset libraries and upgrades can also be downloaded from www l acoustics com L ACOUSTICS XT Manual VI 2 11 2003 8 3 3 GUIDELINES REGARDING SYSTEM PROTECTION As standard limit thresholds for XTA and BSS Processors are initially set at 3 dBu above the RMS power handling for both low and high sections of the 2XT and 15XT as follows 2 low section 6 dBu 12XT high section 3 dBu I 5XT low sect
46. e not glued onto the grille there is no need to completely remove the acoustic foam in order to remove the loudspeaker grille The damaged loudspeaker should be returned to your distributor or directly to L ACOUSTICS for warranty examination and reconing c Polarity Check Whenever a HF diaphragm or loudspeaker component is replaced wiring polarity should be checked with a polarity checking device Both LF and HF components should operate with positive polarity d Periodic Check The frequency response of the enclosure should be checked periodically to check for any deviations due to wear shock or other damage This should be done on an annual basis for systems not subjected to demanding use For systems being used on a daily basis for sub hire or touring enclosures should be checked every month or even more frequently A frequency response check can be performed with a high resolution RTA real time analyzer or preferably using WINMLS SMAART SPECTRAFOO TEF or MLSSA measurement systems Refer to the on axis amplitude frequency response to determine if your XT enclosure is within specification In addition a response sweep using a sine wave generator is useful for checking for coil rubs buzzes air leaks or other undesirable mechanical vibrations as part of the periodic quality control procedure The mechanical attachment of both low frequency and high frequency loudspeakers should be checked periodically since mount screws can bec
47. e subwoofers can be used with positive polarity and this helps to simplify installation and system tuning If more low frequency energy is desired from the flown XT system 3WX presets can be used and subwoofer polarity will depend on how subwoofers are processed i e whether they are driven with the same signal as the XT enclosure or driven via discrete AUX send Following time alignment subwoofer polarity is a parameter to experiment with in order to obtain the best results L ACOUSTICS XT Manual VI 2 11 2003 36 5 INSTALLATION PROCEDURES 5 1 ETRII2XT 5 U BRACKET ATTACHMENT ETRII2XT and ETRI I5XT are optional accessory U Brackets for ceiling wall or scaffold mounting of the I I2XT or 115 respectively in either horizontal or vertical orientations Three mount holes are available on the center section of the ETRII2XT and ETRIISXT for bracket mounting Pole mount adapter plates on 2XT and I5XT enclosures allow for 10 degree angular resolution Note When using ETRI 12XT or ETRI 15XT in the vertical orientation always install with the fixed arm on the bottom and the pivoting arm on top 2 Scaffold clamp not supplied 5 Remove locking pin for pivoting arm 6 ETRI I2XT ready to mount the 112 L ACOUSTICS XT Manual V1 1 2 11 2003 37 7 112 pole mount sockets mate with U bracket studs 9 Rotate the pivoting arm into position the locking pin qu
48. ed MONITOR presets are derived under half space measurement conditions A variety of 3 way presets are provided for use of 112 or 115 loudspeaker enclosures with 58115 58118 58218 or dV SUB subwoofers Standard 3W presets utilize a complimentary 100 Hz crossover point for the XT and its companion subwoofer and are recommended for closely coupled applications Alternatively when XT enclosures are flown and subwoofers are ground stacked 3WX presets can be employed where an 80 Hz low pass filter is applied to the subwoofers and 112 or low frequency response extends to 55 or 50 Hz respectively 3 2 XT PRESET POLICY According to L ACOUSTICS policy key parameters are software protected and preset data or passwords are not available in order to preserve quality control confidentiality and to maintain the integrity of LLACOUSTICS system presets Restricting access to presets is in no way meant to restrict flexibility or the creative process on the contrary software protected presets are intended to enhance creativity by ensuring quality control and repeatability Extensive engineering and real world testing goes into determining optimum presets detailed polar measurements and weighted spatial averaging are used to determine component equalization time alignment crossover points and crossover filter slopes for example As a result L ACOUSTICS presets give the user an optimum starting point system tuning should b
49. ed 16 I I5FM LO A HI I5FM LO B I5FM HI I 2WX SINGLE 2 way stereo not linked I I5FM LO A HI I5FM LO B HI B X A X XX5 r np JA EMG J II5FM 3W 58115 3 SUB B 18 SBII5 I5FM LO A SBII5 B I 15FM 58118 3 way SUB 19 58118 A I5FM LO I 5FM HI A 5 118 B I 15FM 3W 58218 3 way A SUB B SB218 A I 5FM LO A I 5FM HI SB218 B I I5FM 3W dV SUB 3 way A SUB B dV SUB A I I5FM LO HI A dV SUB B e EN B unn M D F J 2 2W FILL 22 12XT LO 12XT HI A I 12XT LO B 2 B I12XT 2W FRONT 12XT LO A 12XT HI A 12XT LO B 12XT HI B 112 2W MONITOR 2 way stereo not linked I I2XT LO A I2XT HI 12 LO B 12XT HI B ases PPon w F R T z YT ri 2 5 115 3 way A SUB B 25 58115 A I2XT LO I2XT HI A 58 15 B 112 3WX SBI 15 3 way SUB 58 115 12 LO A I2XT HI 5 115 I 12XT 3W 5 118 3 way A SUB B SBII8 I I2XT LO A I2X
50. ed for the HF section the extra available power then translates into headroom for improved high frequency transient response Sections 2 1 and 2 2 give a summary of rms and peak power handling along with recommended power amplifier output specifications for operation of single 112 or 115 enclosures or multiple XT enclosures in parallel 2 1 POWERING 12 Continuous rms and peak power handling ratings for the 2XT are as follows LF Section 48 volts rms long term pink noise with 6 dB crest factor 290 Watts continuous 160 Watts peak at 8 ohms HF Section 33 volts rms long term pink noise with 6 dB crest factor 35 Watts continuous 540 Watts peak at 8 ohms Table 1 Load and Power Ratings for 12 2 ENCLOSURE RATINGS LOW 8 290 1160 580 4 580 2320 1160 27 870 0 3480 1740 2 1160 4640 HIGH 8 135 540 540 4 270 1080 1080 27 400 0 1600 1600 2 540 2160 For amplifying 2 2 in parallel the recommended amplifier specifications are LOW Amplifier Output Power 1160 W into 4 ohms HIGH Amplifier Output Power 1080 W into 4 ohms For amplifying 3 12 in parallel the recommended amplifier specifications are LOW Amplifier Output Power 740 W into 2 7 ohms HIGH Amplifier Output Power 1600 W into 2 7 ohms L ACOUSTICS XT Manual VI 2 11 2003 12 For amplifying 4 2 in parallel the recommended amplifier specifications are LOW Amplifier Output Power 2320 W into 2 ohms
51. ent system main L R FOH plus fill systems with the energy generated on stage is also an important consideration for the first 10 rows of the audience WINMLS SMAART or SPECTRAFOO cost effective measurement tools for performing time alignment that are recommended FLOWN CENTER CLUSTER Due to their compact size point source behavior and generous coverage XT enclosures are highly suitable for center cluster applications Typically this will be necessary when the stage opening is wide and the left right FOH system separation is more than 20 meters Apart from coverage issues image localization is an important consideration particularly for theatrical installations and careful time alignment plus attenuation can significantly improve subjective localization for the audience to the onstage performers some cases two XT enclosures can be arrayed vertically as a center cluster and considered as separate floor and balcony systems with different signal processing time delay level equalization applied to the individual XT enclosures in order to optimize image localization for the two separate audience areas Trim height and tilt of an XT center cluster fill system will depend on the distance to the first rows of the audience and on the height of the proscenium opening DISTRIBUTED FRONT FILL As an alternative or complement to a flown center cluster XT enclosures can be stacked on top of a central line array of subwoofers or any othe
52. ers L ACOUSTICS SBI 15 SBII8 58218 or dV SUB HM arte a e ru IE E E MET Li n ur SOC apa LEES PAS Eoo S Figure 2 1 12XT Enclosure L ACOUSTICS XT Manual VI 1 2 11 2003 10 I 4 115XT SPECIFICATIONS The 115 is an active two way coaxial full range loudspeaker containing one direct radiating bass reflex loaded 15 inch low frequency transducer and one 1 4 inch exit 3 inch voice coil diameter titanium alloy diaphragm neodymium compression driver As a full range system frequency response is 60 Hz to 18 kHz with less than 3 dB variation and the usable bandwidth is 50 Hz to 18 kHz 10 dB The cone body of the low frequency component provides pattern control loading of the compression driver and yields an 80 degree 20 degree conical dispersion pattern that is axi symmetrical The crossover point between low and high frequency components is kHz with 24 dB per octave Linkwitz Riley characteristics Long term power handling is 250 Wrms for the low section and 85 Wrms for the high section at a nominal 8 ohm impedance Connection to the loudspeaker is made via two parallel 4 pin Neutrik Speakon connectors The I I5XT enclosure has a truncated wedge shape with a curved front profile Dimensions are 58 cm 22 8 in high 44 cm 17 3 in wide at the front of the enclosure 16 7 cm 6 6 in wide at the rear of the enclosure and 47 5 cm 18 7 in deep When used on its rear side the
53. et all that sub energy For smaller set designs it can also be an option to place stereo front fill XT enclosures close to the onstage side fill monitoring system As for distributed front fill applications the height of the HF section should be optimized to suit the audience seating area in order to reduce shadowing effects Special attention should be paid to the first few rows a stacked height of at least 1 2 meters is recommended If possible use distance attenuation loss to your advantage and move XT enclosures as far upstage as possible in order to reduce the increase in SPL over the first few rows relative to the audience further back in the Coverage region L ACOUSTICS XT Manual 2 11 2003 3l OFFSTAGE FILL When the horizontal coverage of the main left right FOH arrays is not sufficient to cover the entire audience area XT enclosures can also be used for offstage fill Typically throw distance requirements are shorter and vertical coverage angles are greater making XT a possible solution for this application Some Final Notes Concerning Fill Applications Digital processor presets for 12XT and 115XT loudspeaker enclosures have been specifically engineered to be sonically compatible with all other L ACOUSTICS models FILL presets nominally flat are recommended for all proximity fill applications where the audience is located close to fill loudspeakers for example front fill or stereo infill configurations
54. he most uniform coverage 2 dB variation SPL from between 250 5k Hz is possible Formulae are provided for various cases center to center overlap minimum overlap or no overlap in order to determine physical layout parameters for the distributed loudspeaker grid Interested readers are referred to Chapter 13 Distributed Sound Systems in Sound System Engineering for complete details 4 5 2 DELAY SYSTEMS XT enclosures are highly suited for delay system installation in order to cover large audience areas When installing delay systems there are a few principles that should be followed Over delaying up to 5 ms is acceptable due to the Haas effect Greater than 5 ms is not acceptable since the delayed sound will be perceived as an echo behind the main signal Time alignment of delays should be made using a measurement point on the axis of the reference source and the delayed source the delay time setting is such that the two sources arrive at the same time on axis the reference source will be slightly ahead of the delay source at any other location off axis and the Haas effect will allow for correct localization For some applications speech it is advised to under delay in order to optimize off axis intelligibility and clarity behind the delayed system i e closer to the stage 2 Spread different sources with different delayed signals instead of grouping them in a single location This allows for broader coverage by th
55. ide an excellent solution for side fill or drum fill monitoring Single or two enclosure stacked configurations are the most common set up for these applications and the XT can also be used without subwoofers depending on the amount of LF extension expected by the monitor engineer or performing artist When stacked on top of vertically oriented 5 18 or SB218 subwoofers for side fill applications XT enclosures will physically be at a convenient height that is close to the performer s ear level Normally for drum fill subwoofers will be oriented horizontally in order to maintain a low profile Since the XT and its companion subwoofer are physically coupled for side fill or drum monitoring applications 3W presets are recommended since complimentary 100 Hz crossover filtering optimizes the power bandwidth for the subwoofer and the 112 or 15 low section please see Section 4 8 for further details 4 8 USING XT WITH SUBWOOFERS For most music applications I2XT or I I 5XT enclosures should be used with 58115 58118 58218 or dV SUB subwoofers Issues involved in effectively using XT with subwoofers are discussed below and as a reference L ACOUSTICS subwoofer specifications are summarized in Table 12 and Fig 14 Table 12 LLACOUSTICS Subwoofer Specification Summary L ACOUSTICS Freq Resp Usable LF Sensitivity RMS POWER POWER SPL MAX SPL REC D LOAD 45 70 45 100 40Hz 94 45 2sow ioow 12048 12608 s
56. in access to the compression driver diaphragm Remove the damaged diaphragm and before installing the replacement diaphragm ensure that the voice coil gap is free from any metallic particles dirt or other debris by using 2 sided tape and acetone if necessary to thoroughly clean out the gap After installing the replacement diaphragm apply a low level low frequency sine wave sweep for example 4 volts from 100 Hz kHz to ensure that the diaphragm is properly centered in the gap before reinstalling the compression driver back cover Make sure all compression driver diaphragm and back cover mount screws are securely fastened loctite is optional but recommended L ACOUSTICS XT Manual VI 1 02 03 41 As a final check apply a high level sine sweep over the HF compression driver s operating bandwidth for example 13 volts from kHz to 18 kHz Re mount the entire XT coaxial assembly in its enclosure and perform a system polarity check Following service the damaged compression driver diaphragm should be returned to your distributor or directly to L ACOUSTICS for warranty examination b LF Service The 12 or 15 loudspeaker components of the coaxial assemblies used in the I2XT and 115 are not field serviceable For field service the entire coaxial assembly should be removed and replaced To remove the front grille lift the edges of the acoustic foam and remove the screws Screws can be found where the edges of the foam ar
57. ion 6 dBu I5 XT high section 2 dBu Amplifier input sensitivities 0 dB MLS switch setting are as follows 5 5 dBu LA24a t 7 7 dBu LA48a 9 5 dBu For the I I2XT and 15 low section the 6 dBu limit threshold corresponds to 3 dBu above the RMS power handling of the low section as well as the input sensitivity of the L ACOUSTICS 5 5 dBu and LA 24 7 7 dBu so that system protection is performed by a combination of the clip limiting circuits of the amplifier and the output channel limiters of the digital signal processor Note L ACOUSTICS recommends that LA power amplifier clip limiters be engaged at all times CLIP switch depressed in the IN position L ACOUSTICS LA amplifier clip limiters are sonically transparent and function by monitoring the output signal and comparing the distortion produced between the input and output of the amplifier If the distortion exceeds 1 THD for any reason voltage or current clipping the limiter reduces the input signal proportionally 2 msec attack 150 msec release Under normal operation clip limiting is inaudible and L ACOUSTICS recommends leaving the Channel A and B clip limiters switched on rear panel button depressed at all times As shown in Sections 2 1 and 2 2 additional protection can be obtained by using the following MLS switch settings for power matching of the amplifier output to the power handling capacity of the XT low and high section
58. ity is horizontally vertically and diagonally symmetric axi symmetric This results in true single source behavior and the performance obtained is superior in terms of coherence when compared with any combination of two independent sound sources separate woofer plus horn loaded compression driver for example This is the case even if the independent sources are designed to provide the same directivity behavior which is rarely the case since the acoustic centers of the two sources are not located at the same physical location Other benefits obtained using the coaxial axi symmetric configuration are smooth acoustical impedance loading for the compression driver and a short time window of reflections which is far more acceptable than the longer reflection sequences that are produced by traditional horn designs In addition the wavefront radiated by an axi symmetric sound source has directivity that is smoothly increasing with frequency which helps to match the acoustical environment of a typical auditorium Normally the reverberation time in auditoria decreases smoothly above kHz and at greater distances in the venue the low frequency energy is fairly constant due to the reverberant field L ACOUSTICS XT Manual V1 1 2 11 2003 5 Loudspeaker focus or aiming can be adjusted so that maximum HF energy is directed towards the farthest listening areas therefore balancing the SPL attenuation with distance that occurs in the direct field At closer
59. ll presets except for Minidrive are distributed via PCMCIA card and can also be downloaded from the L ACOUSTICS website www l acoustics com Since the XTA DP226 is a 2 input by 6 output unit the DP224 is 2 x 4 the FDS 334 is 2 x 4 the FDS 336 is 2 x 6 and the FDS 366 is 3 x 6 exact internal wiring of your FOH drive rack and digital processor channel assignments will vary depending on the selected processor and the application Carefully consider your flexibility requirements before selecting the type of processor to specify NOTE ALWAYS REFER TO THE PRESET DESCRIPTION SHEET FOR YOUR PROCESSOR WHEN SELECTING PRESETS AND CONFIGURING YOUR DRIVE RACK L ACOUSTICS XT Manual VI 2 11 2003 17 3 1 GENERAL DESCRIPTION OF XT PRESETS For 2 way operation three types of presets are provided FRONT presets are for standalone FOH operation without subwoofers where low and high frequency shelving equalization provides a frequency response contour suitable for music applications FILL presets provide nominally flat response for use in speech reinforcement and classical music applications or when XT enclosures are used as a close proximity fill enclosure FRONT and FILL presets are derived under freefield measurement conditions MONITOR presets include additional low frequency equalization to account for half space loading conditions and are intended for floor monitoring applications or fixed installations where the XT is wall or ceiling mount
60. llel operation of multiple XT enclosures Speakon connectors are wired as follows I LF LF 2 2 HF In order to preserve high damping factor essential to the sonic qualities of the system and to prevent overshoot of cone displacement which can result in mechanical damage it is desirable to keep loudspeaker cables as short as possible and with a gauge offering low resistance per unit length The following chart provides information regarding the minimum wire cross section versus length Table 10 Maximum Recommended Length for Damping Factor gt 20 Cross Section Gauge BERNER 8 08 rn o As standard L ACOUSTICS F CABLE SP7 SP25 and F LINK CABLE SP 7 loudspeaker cables are 4 conductor cables with 4 mm conductor cross section 11 gauge SP25 cables can be used for 25 meter cable runs to power a 4 ohm load 2 x II2XT or 115 enclosures in parallel while maintaining a damping factor greater than 20 3 XT CONTROL AND PROCESSING A digital processor is specified for use with XT enclosures in order to provide the following functions crossover filtering component time alignment corrective component equalization system protection and system equalization OEM factory presets are provided for a number of approved digital processors including BSS FDS 366 Omnidrive Compact Plus BSS FDS 334 Minidrive BSS FDS 336 Minidrive XTA DP224 and XTA DP226 A
61. nd ground stacked subwoofers For all FOH applications please refer to Sections 4 2 4 3 4 4 concerning XT aiming arraying and coverage prediction For additional information on using XT enclosures with subwoofers please refer to Section 4 8 4 7 STAGE MONITORING Given the power of digital signal processing and due to their compact wedge shaped format and axi symmetrical directivity XT enclosures provide an extremely high performance plug and play stage monitoring solution FLOOR MONITORING For floor monitoring applications the coaxial component configuration employed in the 112 and provides a high degree of image and coverage stability The benefits of axi symmetric directivity are even more apparent since the performer is in close physical proximity to enclosure and experiences a generous homogeneous coverage pattern without the subjective impression and potential feedback problems of listening to a separate horn woofer combination MONITOR presets include additional low frequency equalization to account for half space loading conditions and are intended for either floor monitoring applications or fixed installations where the XT is wall or ceiling mounted In general under half space loading conditions there is a 6 dB increase around 100 Hz due to floor coupling followed by a broad cancellation that occurs between 200 L ACOUSTICS XT Manual VI 2 11 2003 32 600 Hz due to floor reflections MONITO
62. nd the audience seating area begins very close to the stage it is oftentimes necessary to use distributed front fill speakers for example L ACOUSTICS MTD108a or a ground stacked left right XT stereo infill system in order to improve coverage and image localization for the first rows of the audience L ACOUSTICS XT Manual VI 2 11 2003 26 80 opening angle Aiming towards the back of the audience A i Audience area Figure 10 General guidelines for aiming XT enclosures 4 3 ARRAYING XT ENCLOSURES Figure shows SPL mappings at octave band frequencies for a single XT enclosure generated using CATT Acoustic modeling software demonstrating the evenness of coverage and single point source behavior that is obtained using coaxial technology Note for color versions of figures 11 12 13 and 15 please see the XT manual PDF file that is available for download from www l acoustics com 125 Hz 250 Hz 500 Hz kHz 2 kHz 4 kHz Figure 11 SPL mappings at octave band frequencies for a single XT enclosure Figure 12 shows SPL mappings at octave band frequencies for two XT enclosures with a spacing of 0 5 meters Uneven coverage above 500 Hz demonstrates the comb filtering interference effects that arise due to path length differences as a function of listener position L ACOUSTICS XT Manual V1 1 2 11 2003 27
63. ntation always install the U bracket with the fixed arm on the bottom and the pivoting arm on top Maximum two 12 enclosures can be rigged using ETRI I2XT in conjunction with CPLII2XT Maximum two 15 enclosures be rigged using ETRII5XT in conjunction with CPLIIS5XT Maximum one 112 or I 5XT can be rigged per XT liftbar L ACOUSTICS recommends the use of safety steels at all times The recessed side mounted fly track sections can be used with the double stud fitting to ring accessory for safety attachment to 2 and 15XT enclosures L ACOUSTICS XT Manual VI 2 11 2003 40 6 XT SYSTEM OPERATION Connect program signal lines L R outputs from a mixing console for example to the and B channel inputs of the digital signal processor XTA DP224 DP226 or BSS 366 With reference to the output channel assignments given in the Preset Description sheets see also Figures 5 6 or 7 connect the outputs of the DSP unit to the corresponding amplifier inputs directly or via your signal distribution return snake multicore system For 6 channel units DP226 and BSS 336 or 366 outputs 2 3 correspond to Sub XT low XT high for input A while output channels 4 5 6 correspond to Sub XT low XT high for input B Power up the DSP unit and select the appropriate preset for 2 way operation FRONT FILL or MONITOR or 3 way operation 3W 3WX for I I2XT or I I5XT plus 581 15 58118 58218
64. ome loose after being submitted to intense long duration mechanical vibrations Similarly it is a good idea to periodically check that the high frequency diagram and rear cover for the compression driver are solidly attached The quality of the contacts and locking action of the SPEAKON connector should also be checked periodically 6 2 SPARE PARTS qup a conapaer ESI SBC HR BCI2I 2 recone kit inc labour E HR BCI5I 5 recone kit inc labour CM 112 Frontfoam CM 115 Front foam MC 112 Front grill MC II5XTGRL Front grill CD COLNEO Neoprene glue 500ML CD COLNEO Neoprene glue 500ML L ACOUSTICS XT Manual VI 1 02 03 42 7 SPECIFICATIONS 7 1 112XT ELEMENT SPECIFICATIONS Frequency Response Frequency response 65 18k Hz 3 dB FRONT preset Usable bandwidth 55 8k Hz 10 dB Sensitivity LF 2 83 Vrms at m 98 5 dB SPL 65 Ik Hz HF 2 83 Vrms at m 106 dB SPL 1 18 kHz Power Rating Amplification Impedance Long Term recommended nominal LF 48 Vrms 290Wrms 1160 Wpeak 580 W 8 ohms HF 33 Vrms 135 Wrms 540 Wpeak 540 W 8 ohms Nominal Directivity 6 dB Axi symmetrical 90 20 System Output SPL One enclosure 122 dB cont 128 dB peak FRONT preset 124 dB cont 30 dB peak FILL preset 125 dB cont dB peak 3W preset FRONT preset
65. oow 8 35 100 32Hz 97 70 2400 12548 13168 i200W 8 28 140 25Hz 1005 68 1 00 4400 13048 13698 2200 4 40 2004 35Hz 1045 57 1200 13348 13908 2400W 27 4 7 00 UJ dB SPL Continuous one source LLLLLLLLLL LLLLLLLLL Pt tT E j LE LE j LS L LI LL _ _ _ j j _ __ 1 l al E I ES E E LL ILI TST LU C I 1 1 111111 frequency Hz Figure 16 L ACOUSTICS Subwoofer Continuous Unweighted SPL Comparison L ACOUSTICS XT Manual 2 11 2003 34 All 3 way XT presets have been optimized to provide 6 dB low frequency contour when subwoofers are used with 112 or 115 enclosures in a 1 1 XT subwoofer ratio In order to compensate for sensitivity differences between subwoofer models relative sub low and high output channel gains have been adjusted for individual presets so that the same 6 dB low frequency contour is obtained regardless of the subwoofer model in use 4 8 1 Combining XT With Subwoofers Two cases can be considered ground stacked systems where XT and subwoofer enclosures are closely coupled physically or separate flown XT loudspeakers with ground stacked subwoofers For both cases processing will depend on the intended purpose of the subwoofers i e in some applications
66. or 85 Watts continuous 350 Watts peak at 8 ohms Table 5 Load and Power Ratings for 115 I15XT ENCLOSURE RATINGS LOW 8 250 1000 4 500 2000 1000 27 7500 3000 1500 2 1000 4000 2000 HIGH 8 85 350 4 170 700 700 2 7 250 0 1000 1000 2 350 1400 1400 For amplifying 2 115 in parallel the recommended amplifier specifications are LOW Amplifier Output Power 1000 W into 4 ohms HIGH Amplifier Output Power 700 W into 4 ohms For amplifying 3 l 15XT in parallel the recommended amplifier specifications are LOW Amplifier Output Power 1500 W into 2 7 ohms HIGH Amplifier Output Power 1000 W into 2 7 ohms For amplifying 4 115 in parallel the recommended amplifier specifications are LOW Amplifier Output Power 2000 W into 2 ohms HIGH Amplifier Output Power 1400 W into 2 ohms L ACOUSTICS XT Manual VI 2 11 2003 14 Based on these specifications recommended L ACOUSTICS LA power amplifier specifications MLS switch settings are summarized below in Tables 6 and 7 Table 6 Recommended power amplification and MLS switch settings for 15XT low section 5 LOW SECTION AMPLIFIER OUTPUT POWER POWER MLS SETTING do not use do not use Table 7 Recommended power amplification and MLS switch settings for 1 15XT high section I 15XT HI SECTION AMPLIFIER OUTPUT POWER REC D POWER MLS SETTING MLS switch settings for powering the 115 are summarized in Table 8 Table 8 Recommended
67. ound system design aspects is beyond the scope of this manual necessary we recommend the use of a specialized sound engineer or consultant since the best products can produce the worst results i improperly set up In order to get the best results it is important to follow correct sound design principles properly integrate your XT enclosures with subwoofers use the correct power amplification and use the correct OEM factory preset In general terms 112 or 115 enclosures are intended for distributed sound reinforcement or small to medium scale Front Of House FOH applications FOH applications include theatres clubs multi purpose venues or corporate events Distributed applications include delay rings for large scale installations surround effects channels for theatre multimedia distributed reinforcement for sports venues or delays for speech reinforcement in convention centre ballrooms Although optimized for single operation in distributed configurations XT loudspeakers can be used in vertical or horizontal arrays of two enclosures to enhance either SPL or coverage Due to their compact wedge shaped format and axi symmetrical directivity 112 or 115 enclosures also provide an exceptionally high performance floor monitor solution When used in conjunction with L ACOUSTICS SBI15 58118 58218 or dV SUB subwoofers the I2XT or 115 are also suitable for side fill and drum monitoring applications 4 2 AIMING XT ENCLOS
68. power handling for example 12XT HF limit threshold 3 dBu gt 0 dBu NOTE Setting limit thresholds to the amplifier input sensitivity or the rated power handling of the section being driven is important since this calibrates the output meter display of the crossover to correspond to either the amplifier clip point or the rated power handling This gives the system operator a direct visual indication as to how hard the system is being operated 3 4 XT PRESET LIBRARIES As described in Section 3 2 three types of 2 way presets for 112 and I5 XT are provided FILL and MONITOR while two types of 3 way presets are available for the use of XT enclosures with L ACOUSTICS 58115 58118 58218 or dV SUB subwoofers 3W and 3WX All 2 way presets are configured in stereo 3 way mode i e channel A and B Low High outputs are on output channels 2 3 and 5 6 respectively This means that drive racks do not require recabling when changing from 3 way to 2 way presets In addition for these 2 way presets channels and 4 are unlocked and available for programming of passive fill loudspeakers subwoofers or alternatively for monitoring input equalization when using the SMAART or SPECTRAFOO measurement systems Note for BSS FDS 366 3 x 2 way presets are provided in memory locations 37 46 This channel configuration is recommended for 3 mix floor monitoring or Left Centre Right LCR applications Please refer to the appropri
69. provides 3 dB low and high frequency contours under freefield conditions FILL preset provides nominally flat response under freefield conditions 3W preset applies a 100 Hz high pass filter Components LF 1 12 weather resistant loudspeaker 3 voice coil HF 1 1 4 exit compression driver titanium diaphragm 3 voice coil coaxial assembly Enclosure Height 540 mm 21 3 in Front Width 410 mm 16 1 in Rear Width 165 mm 6 5 in Depth 375 mm 4 8 in Trap Angle 45 degrees with respect to vertical Net Weight 27 kg 59 5 bs Shipping Weight 30 kg 66 165 Shipping Dimensions 615 x 470 x 465 mm 24 2x 18 5 x 18 3 in Connectors 2x 4 pin Neutrik speakon Material 18 mm 30 mm Baltic birch plywood sealed screwed and rabbeted angles Finish Maroon gray Grill Black epoxy perforated steel with acoustically transparent foam Rigging Integrated flying hardware handles and pole mount socket L ACOUSTICS XT Manual VI 1 02 03 43 SCALE 1 15 L ACOUSTICS XT Manual VI LEFT SIDE RIGHT SIDE 35 amp BOTTOM Dimensions in mm Figure 21 I2XT Line Drawing 1 02 03 44 lt U 5 EP t N df l Figure 22 2 ETRI I2XT Line Drawing z 165 1 pos tio 1 142 position position 3 07 position 4 205 L
70. r object of suitable height provided that the height of the HF section is appropriate for audience coverage Typically a stacked height of at least 1 2 meters is recommended in order to reduce audience shadowing effects and whether the audience is seated or standing should also be considered In addition to these issues sightlines and clearance under the stage lip are also important considerations for a distributed front fill system and when space is at a premium the MTD108a or dV DOSC be considered as alternatives As for overhead distributed or delay systems the optimum spacing between XT enclosures will depend on the coverage angle of the enclosure 90 deg for I2XT 80 deg for 1 15XT and the distance to the first members of the audience Center to center overlap will provide the most uniform coverage and separate time alignment delay taps for front fill enclosures can further assist in improving image localization STEREO INFILL Stacked stereo infill systems using XT enclosures either located onstage or stacked on top of L R ground stacked subwoofer arrays can also be effective for front fill purposes It is always a good idea to keep XT enclosures physically as close as possible to the subwoofers in order to improve sonic integration between the fill system and the subwoofers plus to reduce low frequency proximity effects for the audience located close to the subwoofers i e it S good to give the audience some high end to help offs
71. s 0 dB 0 dB TIXTLOSECTON odB 2dB 248 HI2XTHISECTION ode 2d8 MLS SWITCH SETTING 115XT LO SECTION OdB 2298 48 0 dB 15XT HI SECTION dB 5d CO UJ For the I I2XT and l 5XT high section the 3 dBu 112 or 2 dBu 115 limit thresholds correspond to 3 dBu above the RMS power handling of the high section and system protection is performed by the limiting circuitry of the digital signal processor Example For the 112 the high section limit threshold is set to 3 dBu below the peak power handling in order to provide secure operation i e the RMS power handling is 135 W peak power handling is 540 W and assuming 32 dB amplifier gain these power ratings correspond to limit thresholds of 0 dBu 135 W and 6 dBu 540 W As standard the 112 HF limiter threshold is set to 3 dBu 3 dB less than the peak power handling L ACOUSTICS XT Manual VI 2 11 2003 9 Standard HF limiter thresholds for the 2XT and 115 are suitable for most applications however the following adjustments can be made depending on the program content classical music lots of transients low 5 signal content increase standard HF limit threshold by 3 dB to correspond to the peak power handling for example 12 HF limit threshold 3 dBu gt 6 dBu 2 rave techno music high RMS signal content long duration decrease standard HF limit threshold by 3 dB to correspond to the RMS
72. s are fairly predictable Things become more complex when larger audience area coverage is required and there are two possible approaches Multiplying the number of sound sources by dividing the audience into areas which are covered by individual sources In this case the Haas effect is exploited and the goal is to reduce audible interference effects by dissociating or decoupling the individual sound sources delay lines can also be introduced to provide proper localization This is the distributed sound reinforcement or multiple sound source approach and the XT line of enclosures is highly suited for this type of sound design 2 Coupling a number of individual sound sources to form a loudspeaker array with the objective that each array becomes the equivalent of a single sound source For the second approach conditions for achieving proper coupling of individual arrayed sound sources have been defined by Dr Christian Heil and Professor Marcel Urban in Sound Fields Radiated By Multiple Sound Source Arrays AES paper preprint 3269 presented at the 92nd AES convention in Vienna 1992 Additional conditions were published in the AES preprint Wavefront Sculpture Technology WST that was presented at the 111 Convention NYC 2001 preprint 5488 theory that was developed defines the acoustic coupling conditions required for effectively arraying individual sound sources These conditions are satisfied by the ARCS dV DOSC and V DO
73. ween the flown XT system versus ground stacked subwoofers Typically 3W presets are used for ground stacked configurations in order to optimize power bandwidth for the subwoofer and XT low section and the overall system is driven in either 3 way mode or with separate AUX drive although 3WX presets can also be used 4 8 3 Separate Flown XT Array with Ground Stacked Subwoofers For a separate flown XT array with ground stacked subwoofers time alignment of subwoofers is required due to the geometric path difference between the two systems This is illustrated in Figure 7 where the distance from the measurement microphone position to the subwoofers is dsug while the distance to the flown XT system ow PATH DIFFERENCE Delaying the subwoofers by the geometric path difference will time align the subwoofers at the reference position Note Selection of the reference position for time alignment is always a compromise since the geometric path difference will vary with position L ACOUSTICS XT Manual VI 2 11 2003 35 DIFFERENCE drLowN dsue PATH DIFFERENCE dsub m MEASUREMENT STAGE MICROPHONE 5 218 SB218 e TIME DELAY FLOOR AT PATH DIFFRENCE meters 343 meters second Figure 17 Illustration of subwoofer time alignment In most cases 3W presets are used for flown XT and ground stacked subwoofer configurations in 3 way mode or with separate AUX drive for the subwoofers since th

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