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- Operator's Manual
L-Acoustics 112XT Operator's Manual
Summary of 112XT
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Version 1.1 february 2003 l-acoustics xt line 112xt, 115xt operator manual.
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L-acoustics xt manual v1.1 2/11/2003 1 foreword thank you for purchasing the 112xt or 115xt 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 a...
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L-acoustics xt manual v1.1 2/11/2003 2.
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L-acoustics xt manual v1.1 2/11/2003 3 table of contents foreword..............................................................................................................................................1 manual organization...........................................................................
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L-acoustics xt manual v1.1 2/11/2003 4 list of figures figure 1: xt system components ....................................................................................................................8 figure 2: 112xt enclosure..........................................................................
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L-acoustics xt manual v1.1 2/11/2003 5 0. Introduction effectively covering an audience is the goal of any sound reinforcement system design. This is straightforward in small spaces where a left/right stereo configuration is suitable provided that the available power is sufficient, i.E., a stereo pa...
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L-acoustics xt manual v1.1 2/11/2003 6 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 listening positions, the off-axis attenuatio...
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L-acoustics xt manual v1.1 2/11/2003 7 xt rigging accessories (7) etr112xt adjustable u-bracket for ceiling, wall or scaffold mounting of the 112xt in either horizontal or vertical orientations (8) cpl112xt coupling adapter bars used in conjunction with etr112xt to array two 112xt enclosures vertica...
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L-acoustics xt manual v1.1 2/11/2003 8 etr112xt etr115xt cpl112xt cpl115xt xtliftbar pion2 f-cable do7 f-link cable do.7 figure 1: xt system components.
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L-acoustics xt manual v1.1 2/11/2003 9 1.2 xt overview l-acoustics 112xt or 115xt 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 componen...
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L-acoustics xt manual v1.1 2/11/2003 10 1.3 112xt specifications the 112xt 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 compressi...
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L-acoustics xt manual v1.1 2/11/2003 11 1.4 115xt specifications the 115xt 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, neodymiu...
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L-acoustics xt manual v1.1 2/11/2003 12 2. Powering xt it is important that power amplifiers with sufficient power are used to power the 112xt or 115xt since headroom is less likely to damage loudspeaker components than clipping. Apart from normal standards regarding construction, protection, coolin...
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L-acoustics xt manual v1.1 2/11/2003 13 for amplifying 4 112xt in parallel, the recommended amplifier specifications are: * low amplifier output power: 2320 w into 2 ohms * high amplifier output power: 2160 w into 2 ohms based on these specifications, recommended l-acoustics la power amplifier speci...
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L-acoustics xt manual v1.1 2/11/2003 14 table 4: recommended mls switch settings for powering 112xt mls switch setting la17a la24a la48a 112xt lo section 0 db -2 db -2 db 112xt hi section 0 db -2 db -4 db figure 4: mls switches on the rear panel of l-acoustics la24a, la48a amplifiers 2.2 powering 11...
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L-acoustics xt manual v1.1 2/11/2003 15 based on these specifications, recommended l-acoustics la power amplifier specifications and mls switch settings are summarized below in tables 6 and 7. Table 6: recommended power amplification and mls switch settings for 115xt low section 115xt low section am...
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L-acoustics xt manual v1.1 2/11/2003 16 l-acoustics la 15a power matrix l-acoustics la 17a power matrix mls switch setting mls switch setting load configuration -3 db 0 db load configuration -3 db 0 db 16 ohms quad (4 channel) 95 200 16 ohms stereo (2 channel) 110 215 8 ohms quad (4 channel) 200 370...
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L-acoustics xt manual v1.1 2/11/2003 17 2.3 connectors and cables 112xt and 115xt are supplied with dual nl4 speakon connectors. The two speakon connectors are internally wired in parallel, allowing for loop through connection and parallel operation of multiple xt enclosures. Speakon connectors are ...
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L-acoustics xt manual v1.1 2/11/2003 18 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 suitabl...
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L-acoustics xt manual v1.1 2/11/2003 19 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 112xt and 115xt as follows: 112xt low section : +6 dbu 112xt high ...
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L-acoustics xt manual v1.1 2/11/2003 20 standard hf limiter thresholds for the 112xt and 115xt are suitable for most applications however the following adjustments can be made depending on the program content: 1) classical music - lots of transients, low rms signal content increase standard hf limit...
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L-acoustics xt manual v1.1 2/11/2003 21 l-acoustics v7 0902 presets for xta dp 226 preset name pgm type mem out 1 (source) out 2 (source) out 3 (source) out 4 (source) out 5 (source) out 6 (source) arcs 2w lo 3-way stereo 10 full (a) arcs low (a) arcs hi (a) full (b) arcs low (b) arcs hi (b) arcs 2w...
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L-acoustics xt manual v1.1 2/11/2003 22 l-acoustics v7 0902 presets for xta dp 224 preset name pgm type mem out 1 (source) out 2 (source) out 3 (source) out 4 (source) arcs 2w lo 2-way stereo 10 arcs lo (a) arcs hi (a) arcs lo (b) arcs hi (b) arcs 2w hi 2-way stereo 11 arcs lo (a) arcs hi (a) arcs l...
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L-acoustics xt manual v1.1 2/11/2003 23 l-acoustics v7 0103 presets for bss 334 minidrive preset name pgm type mem out 1 (source) out 2 (source) out 3 (source) out 4 (source) arcs 2w lo 2-way stereo 1 arcs lo (a) arcs hi (a) arcs lo (b) arcs hi (b) arcs 2w hi 2-way stereo 2 arcs lo (a) arcs hi (a) a...
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L-acoustics xt manual v1.1 2/11/2003 24 l-acoustics v7 0103 presets for bss 336 minidrive preset name pgm type mem out 1 (source) out 2 (source) out 3 (source) out 4 (source) out 5 (source) out 6 (source) arcs 2w lo 3(a)+3(b) 1 full (a) arcs low (a) arcs hi (a) full (b) arcs low (b) arcs hi (b) arcs...
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L-acoustics xt manual v1.1 2/11/2003 25 l-acoustics v7 0902 presets for bss 366 preset name pgm type mem out 1 (source) out 2 (source) out 3 (source) out 4 (source) out 5 (source) out 6 (source) user 3(a)+3(b) 1 arcs 2w lo 3(a)+3(b) 2 full (a) arcs low (a) arcs hi (a) full (b) arcs low (b) arcs hi (...
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L-acoustics xt manual v1.1 2/11/2003 26 4. Sound design 4.1 applications the art of designing a sound system is a profession in itself and a complete description of all sound system design aspects is beyond the scope of this manual. If necessary, we recommend the use of a specialized sound engineer ...
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L-acoustics xt manual v1.1 2/11/2003 27 figure 10: general guidelines for aiming xt enclosures 4.3 arraying xt enclosures figure 11 shows spl mappings at octave band frequencies for a single xt enclosure (generated using catt-acoustic modeling software), demonstrating the evenness of coverage and si...
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L-acoustics xt manual v1.1 2/11/2003 28 125 hz 250 hz 500 hz 1 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 o...
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L-acoustics xt manual v1.1 2/11/2003 29 avoid works best 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 hz 1 khz 2 khz 4 khz figure ...
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L-acoustics xt manual v1.1 2/11/2003 30 4.4 predicting xt coverage polar data files are available for modeling 112xt and 115xt 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 informati...
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L-acoustics xt manual v1.1 2/11/2003 31 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, offstag...
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L-acoustics xt manual v1.1 2/11/2003 32 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 ...
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L-acoustics xt manual v1.1 2/11/2003 33 600 hz (due to floor reflections). Monitor 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 ...
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L-acoustics xt manual v1.1 2/11/2003 34 side fill or drum fill monitoring when used in conjunction with sb115, sb118, sb218 or dv-sub subwoofers, 112xt or 115xt enclosures provide an excellent solution for side fill or drum fill monitoring. Single or two enclosure stacked configurations are the most...
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L-acoustics xt manual v1.1 2/11/2003 35 all 3-way xt presets have been optimized to provide a 6 db low frequency contour when subwoofers are used with 112xt or 115xt enclosures in a 1:1 xt:subwoofer ratio. In order to compensate for sensitivity differences between subwoofer models, relative sub, low...
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L-acoustics xt manual v1.1 2/11/2003 36 stage path difference measurement microphone floor time delay (sb218) (flown system) d sub (m) d flown= d + sub path difference d sub (m) (sb218) path diffrence (meters) 343 (meters/second) t = figure 17: illustration of subwoofer time alignment in most cases,...
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L-acoustics xt manual v1.1 2/11/2003 37 5. Installation procedures 5.1 etr112xt, etr115xt u-bracket attachment etr112xt and etr115xt are optional accessory u-brackets for ceiling, wall or scaffold mounting of the 112xt or 115xt, respectively, in either horizontal or vertical orientations. Three moun...
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L-acoustics xt manual v1.1 2/11/2003 38 (7) 112xt pole mount sockets mate with u-bracket studs (8) mount the 112xt in the fixed arm side first (9) rotate the pivoting arm into position – the locking pin automatically secures the u-bracket (10) rotate the loudspeaker into position to select the desir...
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L-acoustics xt manual v1.1 2/11/2003 39 (5) with middle locking pins unattached, the cpl112xt is free to rotate, facilitating installation of the lower 112xt (6) lower 112xt installed (7) attach lower locking pins on both sides of the lower 112xt to facilitate angling of the cpl112xt (8) attach lowe...
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L-acoustics xt manual v1.1 2/11/2003 40 5.3 xtliftbar attachment the optional xtliftbar accessory allows for single point rigging of 112xt or 115xt 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 ...
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L-acoustics xt manual v1.1 11-02-03 41 6. Xt system operation connect program signal lines (l/r outputs from a mixing console, for example) to the a 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 prese...
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L-acoustics xt manual v1.1 11-02-03 42 as a final check apply a high level sine sweep over the hf compression driver’s operating bandwidth (for example: 13 volts from 1 khz to 18 khz). Re-mount the entire xt coaxial assembly in its enclosure and perform a system polarity check. Following service, th...
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L-acoustics xt manual v1.1 11-02-03 43 7. Specifications 7.1 112xt element specifications frequency response frequency response: 65 – 18k hz (± 3 db) (front preset) usable bandwidth: 55 – 18k hz(-10 db) sensitivity lf (2.83 vrms at 1 m) 98.5 db spl (65 – 1k hz) hf (2.83 vrms at 1 m) 106 db spl (1 – ...
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L-acoustics xt manual v1.1 11-02-03 44 figure 21: 112xt line drawing.
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L-acoustics xt manual v1.1 11-02-03 45 figure 22: 112xt + etr112xt line drawing figure 23: 112xt + xtliftbar line drawing.
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L-acoustics xt manual v1.1 11-02-03 46 figure 24: 112xt + etr112xt + 112cplxt line drawing (0 degree) figure 25: 112xt + etr112xt + 112cplxt line drawing (30 degrees).
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L-acoustics xt manual v1.1 11-02-03 47 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 1 m) 98 db spl (60 – 1k hz) hf (2.83 vrms at 1 m) 108 db spl (1 – 18 khz) power ratin...
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L-acoustics xt manual v1.1 11-02-03 48 figure 26: 115xt line drawing.
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L-acoustics xt manual v1.1 11-02-03 49 figure 27: 115xt + etr115xt line drawing figure 28: 115xt + xtliftbar line drawing.
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L-acoustics xt manual v1.1 11-02-03 50 figure 29: 115xt + etr115xt + 115xtcpl line drawing (0 degrees) figure 30: 115xt + etr115xt + 115xtcpl line drawing (30 degrees).