L-Acoustics 112XT, Operator'S Manual

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L-ACOUSTICS XT Manual V1.1 2/11/2003
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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 wired as follows:
1+ = LF+
1 - = LF -
2+ = HF+
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 > 20
Cross Section Gauge 8 ohms 4 ohms
Metric (mm2) Imperial Metric Imperial Metric Imperial
2.5 13 30 m 100 ft 15 m 45 ft
4 11 50 m 150 ft 25 m 75 ft
6 8 75 m 225 ft 37 m 110 ft
10 6 120 m 360 ft 60 m 180 ft
As standard, L-ACOUSTICS F-CABLE (SP7, SP25) and F-LINK CABLE (SP.7) loudspeaker cables are 4
conductor cables with 4 mm 2 conductor cross-section (11 gauge). SP25 cables can be used for 25
meter cable runs to power a 4 ohm load (2 x 112XT or 115XT 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. All 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.