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3.0 Designing an EVF/EVH Cluster (cont.)
Figure 2:
Typical “reach” of a single loudspeaker into a venue (D
I
) in order to maintain the desired ±3 dB coverage is about two times the distance to the closest seats (D
S
)
Adding a long-throw device will typically extend this reach to about three times the closest distance. See
Figure 3.
Figure 3:
Adding a long-throw device extends the reach to about three times the distance to the closest seat
For reaches beyond this, loudspeakers can be suspended over the audience, with their signal delayed with respect to the front or source loudspeakers so that the sound image will appear to come from the front of the room. The details of these design tips are beyond the scope of this manual and should be left to experienced design personnel.
3.4 Coverage-Uniformity Target
A good uniformity target is ±3 dB throughout the audience area, particularly in the 2,000- and 4,000-Hz octave bands, the bands most important for intelligibility. Such coverage should also be achieved in the
8,000-Hz band, important for “sparkle.” As a reference, a 1-dB level difference is nearly imperceptible, a
3-dB difference is noticeable but not a large change, a 6-dB change is clearly noticeable and a 10-dB change is twice or half as loud. The ±3-dB uniformity target is related to these perceptual differences.
Electro-Voice EVF/EVH User Manual 13
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Table of contents
- 3 Rigging-Safety Warning
- 4 1.0 Introduction
- 9 1.1 Finishes and Colors Available
- 9 1.2 EVF Front-Loaded Series
- 9 1.3 EVH Horn-Loaded Series
- 10 1.4 Accessories for EVF and EVH Systems
- 10 2.0 Tool List
- 11 3.0 Designing an EVF/EVH Cluster
- 11 3.1 General Aiming and Placement Guidelines
- 11 3.2 Choosing between the EVF Full-Range and EVH Full-Range Systems
- 11 3.21 Directivity Break Frequency Defined
- 12 Loudspeakers and How Far a Single Cluster Can “Reach” into a Venue
- 12 3.31 Basic Clustering Guidelines
- 13 3.4 Coverage-Uniformity Target
- 14 3.5 Multiple-Source Interference in Clusters
- 16 3.51 Reducing Multiple-Source Interference
- 19 4.0 Preparing EVF and EVH Systems for Installation
- 19 4.1 Recommended Preflight Procedures
- 19 4.2 Passive/Biamp Crossover Configuration
- 20 4.3 Rotation of High-Frequency Waveguides (EVF Systems)
- 20 Contours (EVH Systems)
- 21 4.5 Digital Signal Processing
- 21 4.51 Full-Range Systems in Passive Mode
- 22 Clusters that Operate on a Single Power-Amplifier Channel
- 22 4.53 DSP (Digital Signal Processor) Loudspeaker Presets for Biamp Operation
- 23 5.0 EVF and EVH Rigging System
- 23 5.1 Introduction
- 23 5.11 The Flying EV-Innovation (EV-I) Loudspeaker System
- 26 5.12 Important Details that Apply to the VRK and HRK Rigging Kits
- 26 5.2 EV-I Rigging Primer
- 27 5.21 Anatomy of an EVF or EVH Flying System Using M10 Eyebolts
- 27 5.211 Eyebolt Application Warnings
- 28 5.212 Eyebolt Installation
- 29 5.213 All-Eyebolt Clusters
- 31 5.22 VRK Kits and Vertically Rigged Clusters
- 32 5.23 HRK Kits and Horizontally Rigged Clusters
- 35 5.24 Assembly Instructions for VRK and HRK Kits
- 37 6.0 Rigging-Strength Ratings and Safety Factors
- 37 6.1 Working Load Limit and Safety-Factor Definitions
- 38 6.2 Structural-Rating Overview
- 39 6.3 All-Eyebolt Structural Ratings
- 40 6.31 Working Load Limits for Eyebolts
- 41 6.32 Suspension-Line Angles
- 41 6.33 Left-to-Right All-Eyebolt Cluster Angles
- 42 6.4 VRK Rigging Structural Ratings for Vertical Clusters
- 44 6.41 Working Load Limits for Eyebolts used with VRK Vertical Rigging Kits
- 45 6.42 Left-to-Right Vertical Cluster Angles
- 46 6.5 HRK Rigging Structural Ratings for Horizontal Clusters
- 47 6.51 Using Tie Plates as Main Load-Bearing Suspension
- 48 6.52 Suspension-Line Angles for HRK Kits
- 49 6.53 Symmetry for Horizontal Clusters using HRK Kits
- 50 6.54 Inner Connection Points
- 50 6.55 Left-to-Right Horizontal Cluster Angles
- 51 6.6 Ratings for Outdoor Applications with Wind Loading
- 51 6.7 Electro-Voice Structural-Analysis Procedures
- 52 7.0 Rigging Inspection and Precautions
- 53 8.0 Installation Instructions TK
- 54 8.1 Transformer Ratings
- 54 8.2 Approvals and Certifications
- 55 9.0 Refrences
- 55 9.1 Rigging (Printed)
- 55 9.2 Mechanical Engineering (Printed)
- 55 9.3 Rigging (Websites)