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L-Acoustics ARCS User Manual
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L-ACOUSTICS ARCS Manual V2.0
2/13/2003
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Figure 15: ARRAY Cutview simulation of an ARCS insta
llation for theatrical sound reinforcement. The flown
and ground stacked ARCS arrays are both in
verted to provide +20/-40 degree coverage.
As an alternative to ARRAY, CAD tools for AUTOCA
D are available for representing ARCS horizontal
and vertical coverage:
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Table of Contents
Default Chapter
2
Foreword
2
Manual Organization
2
Table of Contents
3
List of Figures
4
List of Tables
4
Introduction
5
Wavefront Sculpture Technology
5
A) the Sound Reinforcement Problem
5
B) Wavefront Sculpture Principles
5
C) the Arcs ® Sound Reinforcement System
6
Figure 1: Conventional Horn Array Versus an Array of ARCS DOSC Waveguides
7
Figure 2: Array of 4 ARCS Enclosures
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1 The Arcs System
8
Arcs System Components
8
Figure 3: ARCS System Block Diagram
9
Figure 4: ARCS System Parts and Accessories
10
Arcs Specifications
11
Figure 5: ARCS Enclosure
11
Arcs Accessories
12
Arcs Rigging Components
12
Figure 6: ARCPLA
12
Figure 7: ARCSCOV
12
Figure 8: ARCOUPL
13
Figure 9: BUMP3, LIFTBAR Rigging Accessories
13
Figure 10: Examples of BUMP3 Requirements for 4 and 5 Element ARCS Arrays
14
Figure 11: ARCBUMP
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Figure 12: ARCSTRAP
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Figure 13: ARCSTRAP, BUMP3, LIFTBAR Requirements for a 2 Row X 4 Element ARCS Array
15
2 Powering Arcs
16
Table 1: Load and Power Ratings for ARCS
16
Table 2A: Recommended Power Amplification and MLS Switch Settings for ARCS Low Section
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Table 2B: Recommended Power Amplification and MLS Switch Settings for ARCS High Section
17
Figure 14: MLS Switches on the Rear Panel of La24A and La48A Amplifiers
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Table 3: L-ACOUSTICS La24A and La48A Power Amplifier Specifications
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Connectors and Cables
19
3 Arcs Control and Processing
19
Table 4: Maximum Recommended Length for Damping Factor > 20
19
General Description of Arcs Presets
20
Arcs Preset Policy
20
Guidelines Regarding System Protection
21
Arcs Preset Libraries
22
Table 5: XTA DP226 Presets
23
Table 6: XTA DP224 Presets
24
Table 7: BSS 366 Omnidrive Compact Plus Presets
25
Table 8: BSS 334 Minidrive Presets
26
Table 9: BSS 336 Minidrive Presets
27
4 Sound Design
28
Applications
28
Single Row Arrays
28
Double Row Arrays
29
Array Aiming
29
Figure 15: ARRAY Cutview Simulation of an ARCS Installation for Theatrical Sound Reinforcement
30
Monitor Side-Fill
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Figure 16: AUTOCAD Utilities for Representing ARCS Horizontal and Vertical Coverage
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Complementary Fill
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Figure 17: ARCS Side-Fill (3 X ARCS, 1 X SB218) Plus Stereo Front-Fill System
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Figure 18: ARCS Fill Application (3 Clusters of 4 X ARCS in an LCR Configuration)
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Flown/Stacked Centre Fill
33
Offstage Fill
33
Stacked Stereo Infill
33
Delay Systems
34
Figure 19: ARRAY Cutview Simulation of an ARCS FOH System with Delays
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Using Arcs with Subwoofers
35
A) Combining Arcs with Subwoofers
35
Figure 20: L-ACOUSTICS Subwoofer Continuous Unweighted SPL Comparison
35
Table 10: L-ACOUSTICS Subwoofer Specification Summary
35
B) Ground Stacked Systems
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Table 11: Subwoofer and Low Section Processing for ARCS 3-Way Presets
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C) Separate Flown Arcs Array with Ground Stacked Subwoofers
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Figure 21: Illustration of Subwoofer Time Alignment
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5 Installation Procedures
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Installation of a Single Row Flown System
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Figure 22: Rigging Procedure for a 4 Enclosure ARCS Array
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Figure 23: Rigging Procedure for a 3 Enclosure ARCS Array
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Installation of a Double Row Flown System
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Arcbump Installation
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Figure 24: Rigging Procedure for a Double Row (4+4) Enclosure ARCS Array
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Figure 25: ARCBUMP Rigging Procedure for a 3 Enclosure Horizontal ARCS Array
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Safety Rules
47
Table 12: ARCBUMP Pick Point Hole Number Versus Tilt Angle for 2, 3 or 4 ARCS
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Table 13: ARCS Rigging Reference Chart
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Arcs System Operation
49
Recommended Maintenance Procedures
49
Spare Parts
50
Specifications
51
Figure 26: ARCS Line Drawing
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L-Acoustics ARCS Specifications
General
Brand
L-Acoustics
Model
ARCS
Category
Speakers
Language
English
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