L-Acoustics 112XT Operator's Manual - page 10
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 components and rigging accessories while also
benefiting from the flexibility afforded by OEM digital presets.
The 112XT is an active 2-way loudspeaker containing a 1.4" exit compression driver that is directly
loaded by the 12" loudspeaker in a coaxial configuration while the 115XT features a 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 produces 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 112XT or 115XT 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,
112XT or 115XT loudspeakers can 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 SB118 (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 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 112XT or 115XT with SB115, SB118, 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 an 80 Hz low pass filter is applied to the subwoofers and 112XT or 115XT 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 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).