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 threshold by 3 dB to correspond to the peak power handling
(for example, 112XT HF limit threshold: +3 dBu -> +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 power handling
(for example, 112XT HF limit threshold: +3 dBu -> 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 112XT and 115XT are provided
(FRONT, FILL and MONITOR) while two types of 3-way presets are available for the use of
XT enclosures with L-ACOUSTICS SB115, SB118, SB218 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 1 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 appropriate 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.
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