Electro-Voice EVF-2151D, EVF-2121S, EVH-1152S, EVF-1152D Normalized, See text for more details

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3.0 Designing an EVF/EVH Cluster (cont’)

This effect is shown in the frequency-response of Figure 5. Given the dimensions of the typical compact loudspeaker systems and when they are clustered in close proximity to one another, the first several in- terference nulls occur right in the middle of the vocal range. A frequency response with these ever-more- closely spaced nulls is known as a “comb filter” response, after the visual appearance of the response.

NORMALIZED

Figure 5:

Typical response off the array axis of the two loudspeakers shown in Figure 4,

showing cancellations due to arrival-time differences

If one of the null frequencies is chosen and the horizontal polar response is measured, the result is shaped like the blue polar response in the center lower graph of Figure 6. In this view, the cluster axis points up (+X). Full output is achieved on this axis, since both signals arrive at the same time. But there are off-axis problems. While the overall coverage of the cluster is about 120° (6 dB down), two deep nulls occur at about 20° on either side of the cluster axis.

Figure 6:

Horizontal polar response (blue center plot) of two closely clustered 60° x 40° loudspeakers aimed 60° apart, showing the off-axis nulls at 1,250 Hz caused by multiple-source interference

(see text for more details)

Electro-Voice EVF/EVH User Manual

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Contents Page Table of Contents Rigging-Safety Warning Table of Contents cont’Introduction EVF-1122S/96 example Introduction cont’End View Front View Side View 143.0 lb 64.9 kg 145.5 lb 66.1 kg Dimension Key suspension point dimensions as shown in figure aboveFinishes and Colors Available EVF Front-Loaded SeriesEVH Horn-Loaded Series Tool List Accessories for EVF and EVH SystemsGeneral Aiming and Placement Guidelines Designing an EVF/EVH ClusterDirectivity Break Frequency Defined Basic Clustering Guidelines Designing an EVF/EVH Cluster cont’Coverage-Uniformity Target Multiple-Source Interference in Clusters See text for more details NormalizedReducing Multiple-Source Interference EVF Full-Range Designing an EVF/EVH Cluster cont’ Preparing EVF and EVH Systems for Installation Recommended Preflight ProceduresPassive/Biamp Crossover Configuration Rotation of High-Frequency Waveguides EVF systems Preparing EVF and EVH Systems for Installation cont’Digital Signal Processing Full-Range Systems in Passive Mode Preparing EVF and EVH Systems for Installation cont’ VRK-1 or HRK-1 connection EVF and EVH Rigging SystemIntroduction Flying EV-Innovation EV-I Loudspeaker System VRK-1 or HRK-1 connection VRK-2 or HRK-2 connectionVRK-3 rigging kit with parts identified EVF and EVH Rigging System cont’VRK-1 rigging kit with parts identified VRK-2 rigging kit with parts identifiedHRK-1 rigging kit with parts identified HRK-2 rigging kit with parts identifiedHRK-3 rigging kit with parts identified EV-I Rigging Primer Important Details that Apply to the VRK and HRK Rigging KitsEVF and EVH Rigging System cont’ Eyebolt Installation All-Eyebolt Clusters Hardware not shown, using aTwo-system horizontal cluster using Systems, using a moderate trim angle Systems, using an extreme 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 Working Load Limit and Safety-Factor Definitions Rigging-Strength Ratings and Safety FactorsStructural Rating Overview Rigging-Strength Ratings and Safety Factors cont’All-Eyebolt Structural Ratings Limits for ALL-EYEBOLT Clusters onlyWLL for M10 eyebolts in the EVI-M10K eyebolt kit Working Load Limits for EyeboltsLeft-to-Right All-Eyebolt Cluster Angles Suspension-Line 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 Maximum load and maximum height for horizontal clusters HRK Rigging Structural Ratings for Horizontal ClustersTwo cluster using HRK rigging kits Using Tie Plates as Main Load-Bearing SuspensionSuspension-Line Angles for HRK Kits Symmetry for Horizontal Clusters using HRK Kits Left-to-Right Horizontal Cluster Angles Inner Connection PointsRatings for Outdoor Applications with Wind Loading Electro-Voice Structural-Analysis ProceduresRigging Inspections and Precautions Rigging Web sites ReferencesRigging printed Mechanical Engineering printedPage 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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