L-ACOUSTICS ARCS Manual V2.0 2/13/2003 18
2.1 CONNECTORS AND CABLES
ARCS is supplied with dual NL4 Speakon connectors. The two Speakon connectors are internally
wired in parallel allowing for loop through connection and parallel operation of 2-3 ARCS 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 4: Maximum Recommended Length for Damping Factor > 20
Cross Section Gauge 8 ohms 4 ohms
Metric (mm
2
) 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). The SP25 cable can therefore be
used for 25 meter cable runs to power a 4 ohm load (2 ARCS in parallel) with a damping factor
greater than 20.
3. ARCS CONTROL AND PROCESSING
A digital processor is specified for use with ARCS 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 Soundweb, BSS FDS 366 Omnidrive Compact Plus, BSS FDS 334 Minidrive,
BSS FDS 336 Minidrive, XTA DP224 and XTA DP226. All presets are distributed via PCMCIA card
(except for BSS Soundweb and BSS Minidrive) or can be downloaded from the L-ACOUSTICS
website (www.l-acoustics.com
).
Since the XTA DP226 and BSS Minidrive 336 are 2 input by 6 output units, the DP224 and Minidrive
334 are 2 x 4, and the BSS 366 Omnidrive Compact Plus 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 number and
type of processor to specify.
NOTE: ALWAYS REFER TO THE PRESET DESCRIPTION SHEET FOR YOUR PROCESSOR WHEN
SELECTING PRESETS AND CONFIGURING THE DRIVE RACK.
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