Electro-Voice EVF-1181S, EVF-2121S, EVH-1152S, EVF-1152D Reducing Multiple-Source Interference

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3.0 Designing an EVF/EVH Cluster (cont’)

At higher frequencies, the interference patterns become more densely packed, which essentially elimi- nates their audibility. Figure 7 shows this effect at 8,000 Hz.

Figure 7:

Horizontal polar response (blue center plot) of two closely clustered 60° x 40° loudspeakers aimed 60° apart, showing multiple, densely packed off-axis nulls at 8,000 Hz caused by multiple-source interference (see text for more details)

3.51 Reducing Multiple-Source Interference

Multiple-source interference cannot be eliminated but it can be substantially reduced. Systems which have radiating devices large enough to hold their rated coverage angles down to relatively low frequen- cies, such as the horn-loaded EVH series that hold their coverage angles down to 500 Hz, will exhibit less interference in clusters. Also, doubling the distance between the two systems of Figure 8 produces multiple interference nulls which are more densely packed than those of Figure 6, reducing the audibility of the interference.

Figure 8:

Horizontal polar response (blue cen- ter plot) of two 60° x 40° loudspeakers aimed 60° apart but with double the distance between grille centers compared to Figures 6 and 7, showing the more densely packed 1,250-Hz off-axis nulls caused by multiple-source interference (see text for more details)

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Electro-Voice EVF/EVH User Manual

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Contents Page Table of Contents Table of Contents cont’ Rigging-Safety WarningIntroduction Introduction cont’ EVF-1122S/96 exampleEnd View Front View Side View 143.0 lb 64.9 kg 145.5 lb 66.1 kg Key suspension point dimensions as shown in figure above DimensionEVF Front-Loaded Series Finishes and Colors AvailableEVH Horn-Loaded Series Accessories for EVF and EVH Systems Tool ListDesigning an EVF/EVH Cluster General Aiming and Placement GuidelinesDirectivity Break Frequency Defined Designing an EVF/EVH Cluster cont’ Basic Clustering GuidelinesCoverage-Uniformity Target Multiple-Source Interference in Clusters Normalized See text for more detailsReducing Multiple-Source Interference EVF Full-Range Designing an EVF/EVH Cluster cont’ Recommended Preflight Procedures Preparing EVF and EVH Systems for InstallationPassive/Biamp Crossover Configuration Preparing EVF and EVH Systems for Installation cont’ Rotation of High-Frequency Waveguides EVF systemsDigital Signal Processing Full-Range Systems in Passive Mode Preparing EVF and EVH Systems for Installation cont’ EVF and EVH Rigging System Introduction Flying EV-Innovation EV-I Loudspeaker SystemVRK-1 or HRK-1 connection VRK-2 or HRK-2 connection VRK-1 or HRK-1 connectionEVF and EVH Rigging System cont’ VRK-1 rigging kit with parts identifiedVRK-2 rigging kit with parts identified VRK-3 rigging kit with parts identifiedHRK-2 rigging kit with parts identified HRK-1 rigging kit with parts identifiedHRK-3 rigging kit with parts identified Important Details that Apply to the VRK and HRK Rigging Kits EV-I Rigging PrimerEVF and EVH Rigging System cont’ Eyebolt Installation Hardware not shown, using a All-Eyebolt ClustersTwo-system horizontal cluster using Systems, using an extreme trim angle Systems, using a moderate trim angleVRK Kits and Vertically Rigged Clusters HRK Kits and Horizontally Rigged Clusters EVF Full-Range Six-enclosure horizontal hang of three systems above Assembly Instructions for VRK and HRK kits Short in front Toward grille Rigging-Strength Ratings and Safety Factors Working Load Limit and Safety-Factor DefinitionsRigging-Strength Ratings and Safety Factors cont’ Structural Rating OverviewLimits for ALL-EYEBOLT Clusters only All-Eyebolt Structural RatingsWorking Load Limits for Eyebolts WLL for M10 eyebolts in the EVI-M10K eyebolt kitSuspension-Line Angles Left-to-Right All-Eyebolt Cluster AnglesVRK Rigging Structural Ratings for Vertical Clusters Limits for Vertical Clusters only WLL for M10 eyebolts in the EVI-M10K eyebolt kit Left-to-Right Vertical Cluster Angles HRK Rigging Structural Ratings for Horizontal Clusters Maximum load and maximum height for horizontal clustersUsing Tie Plates as Main Load-Bearing Suspension Two cluster using HRK rigging kitsSuspension-Line Angles for HRK Kits Symmetry for Horizontal Clusters using HRK Kits Inner Connection Points Left-to-Right Horizontal Cluster AnglesElectro-Voice Structural-Analysis Procedures Ratings for Outdoor Applications with Wind LoadingRigging Inspections and Precautions References Rigging printedMechanical Engineering printed Rigging Web sitesPage Page Electro-Voice
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EVH-1152S, EVF-1152S, EVF-1122S, EVF-1122D, EVF-1152D specifications

Electro-Voice is renowned for its high-quality audio solutions, and the EVF series embodies this commitment. The EVF-2121S, EVF-1121S, EVF-1181S, EVF-1151S, and EVF-2151D are a collection of loudspeakers designed for a variety of professional audio applications, each with its distinctive features and capabilities that cater to different sound reinforcement needs.

The EVF-2121S is a dual-12-inch full-range speaker that combines exceptional power handling with a wide frequency response. It utilizes a coaxial driver arrangement, providing even sound distribution and a cohesive audio experience. This model is ideal for medium to large venues, offering a robust SPL (sound pressure level) output and clear reproduction of vocals and instruments.

In contrast, the EVF-1121S features a single 12-inch driver, delivering precise, high-impact sound suitable for smaller spaces. Its design emphasizes clarity and detail, making it perfect for live sound applications. The compact and lightweight design also ensures ease of transport and installation, appealing to mobile sound reinforcement professionals.

The EVF-1181S is a dedicated subwoofer that amplifies low frequencies, featuring an 18-inch woofer for deep, powerful bass response. Its extended low-frequency output enhances the overall sound experience, making it an ideal choice for high-energy music events and professional club environments. Designed with rugged construction and efficient power handling, the EVF-1181S is built to withstand demanding conditions while delivering reliable performance.

The EVF-1151S combines a 15-inch woofer with an advanced high-frequency driver for a full-range sound that works well in theatres, concert halls, and corporate events. The speaker ensures clear mid and high frequencies, maintaining vocal intelligibility even in challenging acoustic environments.

Lastly, the EVF-2151D is a dual 15-inch subwoofer that enhances overall system performance with its ability to produce deep bass. Its compact enclosure design allows for seamless integration into various sound setups, ensuring it can meet the needs of both portable and installed sound systems.

All models in the EVF series incorporate advanced technologies, including proprietary transducers and custom-engineered waveguides, which contribute to their impressive performance. With features like durable enclosures and efficient power handling, these loudspeakers are engineered to provide reliable sound reinforcement for both live and recorded applications. Whether it’s a concert, event, or installation project, the Electro-Voice EVF series stands out for its versatility and audio excellence.
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