V-DOSC

L-Acoustics V-DOSC User Manual

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Version 4

June 2005

V-DOSC



OPERATOR MANUAL

Table of Contents

Table of Contents5
List of Figures8
List of Tables10
Introduction11
- Wavefront Sculpture Technology Fundamentals11
- V-Dosc Training and Qualifications18
  - Qualified V-Dosc Technician (Qvt)18
  - Certified V-Dosc Engineer (Cve)18
The V-Dosc System Standard19
- Figure 6: V-DOSC System Block Diagram20
- Figure 7: LR System Configuration21
- Figure 8: LR System Plus Offstage Fill Configuration22
- V-Dosc System Components23
  - Loudspeaker Enclosures23
  - Figure 9: V-DOSC System Loudspeakers Plus Accessories23
  - Rigging Accessories24
  - Figure 10: V-DOSC Rigging Accessories25
  - Subwoofer Enclosures26
  - Subwoofer Rigging Accessories26
  - Figure 11: V-DOSC Subwoofer Options26
  - Figure 12: Subwoofer Rigging Accessories26
  - Amplification27
  - Amplifier Racks27
  - Figure 13: L-ACOUSTICS La48A Power Amplifier27
  - Figure 14: Amplifier Rack Options and Accessories28
  - Signal Distribution and Cabling29
  - Figure 15: Signal Distribution and Cabling30
  - Loudspeaker Cabling31
  - Figure 16: Loudspeaker Cabling Options32
- Figure 17: V-DOSC Enclosure - Front and Rear Views33
- V-Dosc Specifications33
- Figure 18: V-DOSC BUMP234
- V-Dosc Rigging System34
- Figure 19: BUMPDELTA35
- Sb218 Subwoofer Specifications35
- Figure 20: SB218 Subwoofer - Front and Rear Views36
- Figure 21: BUMPSUB SB218 Flying Bar37
- Sb218 Rigging System37
- Powering V-Dosc38
- Table 1: L-ACOUSTICS La48A Power Amplifier Ratings38
- Table 2: Load and Power Ratings for V-DOSC39
- Figure 22: V-DOSC Pado4A Amplifier Rack Panel40
- Figure 23: V-DOSC Pado2A Amplifier Rack Panel40
- V-Dosc Amp Panels40
- Figure 24: Pado4A Amp Rack Wiring41
- Table 3: Pado4A COMB Wiring Chart41
- Table 4: Pado4A Internal Amp Rack Wiring Chart41
- Figure 25: Pado2A Amp Rack Wiring42
- Table 5: Pado2A COMB Wiring Chart42
- Table 6: Pado2A Internal Amp Rack Wiring Chart42
- Figure 26: L-ACOUSTICS Amplifier Rack Rk124A Loaded with 4 X L-ACOUSTICS La48A Amplifiers43
- V-DOSC AMPLIFIER Racks43
- Figure 27: L-ACOUSTICS Amplifier Rack Options44
- Comb Connectors45
- Table 7: V-DOSC Preset DSP Output Channel Assignment and COMB Connector Summary45
- Figure 28: L-ACOUSTICS Rk122A Amplifier Rack Channel Assignments and Cabling46
- Figure 29: L-ACOUSTICS Rk124A Amplifier Rack Channel Assignments and Cabling46
- Figure 30: L-ACOUSTICS Rk122A Amp Rack Channel Assignments for 2-Way, 3-Way Stereo Presets47
- Table 8: 2-Way, 3-Way Stereo Preset DSP Output Channel Assignment and COMB Connector Summary47
- Figure 31: L-ACOUSTICS Rk124A Amp Rack Channel Assignments for 2-Way, 3-Way Stereo Presets48
- Co24 Control Output Panel49
- Figure 32: CO24 Control Output Panel49
- Co6 Control Output Panel50
- Figure 33: MD24 Multi Distro Panel50
- Figure 34: CO6 Control Output Panel50
- Md24 Multi Distro Panel50
- Approved Digital Signal Processors51
- Oem Factory Presets51
- V-Dosc Presets52
  - Table 9: SUB / LOW OPERATING BANDWIDTH SUMMARY52
  - 3-Way Stereo Presets53
  - Lo/Hi Presets53
  - 4-Way Presets54
  - 5-Way Presets57
  - General Guidelines Regarding System Protection58
  - Table 10: Recommended Limiter Threshold Settings58
- Table 11: XTA DP224 Presets59
- Xta Dp224 V-Dosc Presets59
- Table 12: XTA DP226 Presets60
- Xta Dp226 V-Dosc Presets60
- Lake Contour V-Dosc Presets61
- Table 13: Lake Contour Presets61
- Bss Fds 366 V-Dosc Presets62
- Table 14: BSS FDS 366 Presets62
V-Dosc Coverage Modeling63
- Coverage in the Horizontal Plane63
- Figure 43A: Horizontal V-DOSC Isocontour Averaged from 630 Hz - 16 Khz63
- Figure 43B: Horizontal V-DOSC Isocontour Averaged from 32 Hz - 630 Hz63
- Coverage in the Vertical Plane64
- V-Dosc Coverage Modeling Using Array 200466
- H-Isocont Sheet74
- V-Dosc Coverage Modeling Using Soundvision76
Sound Design85
- Stacked or Flown85
- Achieving Optimum Coverage88
- The Left/Right Configuration88
  - Tradeoffs between Intelligibility and Stereo Imaging88
- LEFT/CENTRE/RIGHT (LCR) Configurations89
- Figure 64: Tradeoffs between Intelligibility Versus Stereo Imaging89
- Figure 65: LCR Configurations89
- Multiple Array Concepts90
- Figure 66: Generic Rigging Plot for a V-DOSC System with Main L/R FOH and LL/RR Offstage Fill Arrays90
- Figure 67: Rigging Plot for a L/R V-DOSC + Flown SB218 System with LL/RR DV-DOSC Offstage Fill91
- Figure 68: Stereo DV-DOSC Offstage Fill System91
- Subwoofers92
- Subwoofer Arraying Techniques97
- Complementary Fill Systems105
Installation Procedures109
- Stacked System109
- Table 15: Angle Strap Values110
- Figure 91: Stacked V-DOSC Offstage Fill System111
- Flown System112
- Figure 92: SOUNDVISION Mechanical Data112
- Figure 93: SOUNDVISION Installation Report Data113
- Figure 94: ARRAY 2004 Installation Data113
- Figure 95: Photo Sequence Showing the Steps Involved in Flying V-DOSC119
V-Dosc System Operation123
- System Tonal Balance123
- Measurement Procedures125
Maintenance and Installation Tools129
- Recommended Maintenance Procedures129
- Recommended Maintenance Tools129
- Spare Parts130
- Recommended Installation Tools131
- Figure 96: Recommended Installation Tools131
Specifications132
- V-Dosc Enclosure Specifications132
- Figure 97: V-DOSC Enclosure - Line Drawing133
- Sb218 Subwoofer Specifications134
- Figure 98: SB218 Subwoofer - Line Drawing134
- Rigging Structures135
- CO24, MD24 Line Assignment Summary137
- Table 17: Whirlwind W6 MASS Connector Input/Output Line Assignments137
- CO24 Control Output Panel Line Assignments138
- Table 18A: CO24 W6 Pin Assignments138
- Table 18B: CO24 W6 Socket Assignments139
- MD24 Multi Distro Panel Line Assignments140
- Table 19A: MD24 W6 Pin Assignments140
- Table 19B: MD24 W6 Socket Assignments141
APPENDIX 1: Why Do Separated Sound Sources Interfere142
Figure 101: the Interference Problem142
Figure 102: Comb Filtering Due to Path Length Differences between Sources143
APPENDIX 2: Further Explanations Regarding WST Criteria144
Figure 103: Destructive Interference Ring for a Line Array at Observation Point M144
Figure 104: the Effect of Varying Frequency and Listener Position M on Fresnel Rings145
Figure 105: Destructive and Constructive Interference Rings for a Line Array at Observation Point M145
Figure 106: Constructive Interference Rings for a Condensed Point Source Line Array146
Figure 107: Destructive Interference Rings out of Beamwidth for Condensed and Standard Line Arrays147
Figure 108: Front View of V-DOSC Array and Vertically Stacked DOSC Waveguides148
APPENDIX 3: How Does V-DOSC Behave with Respect to WST Criteria148
Figure 109: Horn Generated Wavefronts149
Figure 110: DOSC Waveguide - Internal Section149
APPENDIX 4: How Does the DOSC Waveguide Work149
Figure 111: Illustration of the Fresnel and Fraunhofer Regions150
APPENDIX 5: the Border between Fresnel and Fraunhofer Regions150
Figure 112: Illustration of Dborder and DV for a Flat 12 Enclosure Array151
Table 20: Border (in M) between Cylindrical (Fresnel) and Spherical (Fraunhofer) Zones151
Table 21: DV - Vertical Coverage Angle in the Farfield Region151
Figure 113: Illustration of the Variation of Vertical Coverage Angle with Frequency152
APPENDIX 6: Pattern Control of a Constant Curvature Array152
Table 22: WST Criteria Number 5153
APPENDIX 7: WST Criteria Number 5153
Figure 114: Angle Strap Calibration154
APPENDIX 8: Angle Strap Calibration154
APPENDIX 9: V-DOSC Rigging Certification155

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L-Acoustics V-DOSC Specifications

General

Brand	L-Acoustics
Model	V-DOSC
Category	Amplifier
Language	English

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