6.0Rigging-Strength Ratings and Safety Factors

6.1Working Load Limit and Safety-Factor Definitions

The structural ratings for all of the EVF and EVH rigging components and complete loudspeaker sys- tems are based on test results in which parts were stressed to failure. Manufacturers typically present the structural-strength ratings of mechanical components or systems as either the Working Load Limit (WLL) or the ultimate-break strength. Electro-Voice chooses to present the structural-load ratings of the EVF and EVH loudspeaker systems as the WLL. The WLL rating represents the maximum load that should ever be applied to a mechanical component or system.

THE USER SHOULD NEVER APPLY A LOAD THAT EXCEEDS THE WLL OF ANY OF THE RIGGING COMPONENTS OR COMPLETE LOUDSPEAKER SYSTEMS DESCRIBED IN THIS MANUAL.

The WLL for the EVF and EVH rigging components and complete loudspeaker systems described in this manual are based on a minimum 8:1 safety factor. The safety factor is defined as the ratio of the ultimate- break strength divided by the WLL, where the ultimate-break strength represents the force at which a part will structurally fail. For example, if a part has a WLL of 1,000 lb (454 kg), it would not structurally fail until a force of at least 8,000 lb (3,629 kg) was applied, based on an 8:1 safety factor. However, the user should never apply a load to that part that exceeds 1,000 lb (454 kg). The safety factor provides a margin of safety above the WLL to accommodate normal dynamic loading and normal wear.

CAUTIONS for Working Load Limits and Safety Factors

The WLL defined by the manufacturer of any rigging component should never be exceeded. Electro-Voice bases the WLL of its EVF and EVH products on a minimum of an 8:1 safety factor. Other manufacturers of rigging components may base their WLL on safety factors other than 8:1. For example, 5:1 safety fac- tors are fairly common among rigging manufacturers because many regulatory agencies call for a minimum safety factor of 5:1.

When an EVF and EVH loudspeaker system is installed where local regulations only require a safety factor of 5:1, Electro-Voice insists that the WLL of the EVF and EVH rigging never be exceeded and that an 8:1 safety factor be maintained for the EVF and EVH loudspeakers.

The user is cautioned that some local regulations may require safety factors higher than 8:1. In that cir- cumstance, Electro-Voice insists that the user maintain the higher safety factor as required by the local regulations throughout the entire EVF and EVH installation. It is the responsibility of the user to make sure that any EVF and EVH installation meets all applicable local, state or federal safety regulations.

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Electro-Voice EVF-2151D Rigging-Strength Ratings and Safety Factors, Working Load Limit and Safety-Factor Definitions
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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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