Description, Frequency Response | Electro-Voice EVI-28 instruction

EVI-28

250-Watt Two-Way

Compact Vari Intense®

Speaker System

•Ground-breaking advance in single- box utility

•New small-format Vari Intense® horn for consistant SPL throughout the room

•DH2010A titanium compression driver

•Dual 8-inch high-power woofers with amplitude, frequency and delay shading

•1400-watt peak, 250-watt long-term power capacity

•Secure terminal strip inputs

•Compact, lightweight, refinishable, easy-to-install enclosure with U-bracket option

Description

The Electro-Voice EVI-28 full-range loud- speaker is a 250-watt, two-way, high-effi- ciency system featuring a new small-for- mat Vari Intense® horn and dual 210 mm (8-inch) direct radiators in a compact vented enclosure. The EVI-28 combines patented-Vari Intense® technology with amplitude-, frequency- and delay-shading techniques in a fully passive system to a package that is an industry first in perfor- mance, size and cost-effectiveness.

The EVI-28 is intended to be used as a stand-alone full-range system, but may also be used as the midbass/high-frequency component in most multi-way loudspeaker systems. The primary applications for the EVI-28 are in smaller rooms, rooms with lower ceilings than applicable for the EVI-12 and EVI-15, and as a complemen- tary system for upper balconies and un- der-balcony areas. The system is optimized for regular throws on sloped floorplans of approximately 10 to 15 degrees or long throws on a flat floorplan relative to the mounting height.

The high-frequency section of the EVI-28 utilizes a new small-format Vari Intense®

horn driven by the DH2010A one-inch throat, wide-bandwidth, titanium-dia- phragm compression driver. This driver uses a unique, convex-drive Time PathTM phasing plug structure (U.S. Patent #4,525,604). The voice coil is coupled to the diaphragm with EV’s exclusive Reso- nant DriveTM technology. This increases and smooths the high-frequency response and reduces the amount of internal equal- ization for flat frequency response past 25,000 Hz.

EV’s self-resetting PROTM circuit is built into the crossover network to guard the com- pression driver from damage. If input power to the driver exceeds the nominal rating, the pro circuit is activated, reduc- ing the power delivered to the driver by 6 dB. The system will remain in this mode of operation until input power is reduced to a safe level.

The optimally vented bass section of the EVI-28 is designed using Thiele-Small parameters for efficient performance to below 60 Hz. The dual proprietary 210-mm (8-inch) high power, long excursion low fre- quency drivers deliver outstanding perfor- mance. The woofers feature a low-mass extended 51-mm (2-inch) diameter voice

coil combined with a large magnet struc- ture, a stiff, high-internal-damping cone and high-temperature materials for years of reliable performance.

The EVI-28 full-range Vari Intense® loud- speaker system is the ideal system when- ever high output full frequency range ma- terial must be reproduced for balconies, cinemas, distributed systems and smaller rooms in churches, gymnasiums, auditori- ums, hotels and civic centers.

Frequency Response

The combination of dual 210 mm (8-inch) woofers, a wide-bandwidth high-frequency driver and an equalized, delay-, frequency- and amplitude-shading crossover results in the wide and smooth overall response shown in Figure 1. The EVI-28’s long-throw axial frequency response was measured in Electro-Voice’s large anechoic chamber at a distance of 10 feet with a swept sine- wave input of 4 volts. Figure 1 has been averaged and corrected for 1 watt/1 meter.

Directivity

The polar response of the EVI-28 speaker system at selected one-third-octave band- widths is shown in Figure 2. These polar

1.The use of Vari Intense® horns is protected by U.S. patent #5,020,630.

EVI-28 specifications

The Electro-Voice EVI-28 is a highly regarded loudspeaker system known for its advanced design and exceptional sound quality. As part of the EVI series, this model is particularly suited for medium to large venues, delivering clear and powerful audio that stands out for its versatility and performance.

One of the main features of the EVI-28 is its unique design, which utilizes a broad, elliptical waveguide. This technology allows the speaker to provide a wider sound dispersion, ensuring that audiences experience a consistent audio quality regardless of their position within the listening area. The waveguide design not only improves coverage but also minimizes feedback issues, making it an ideal choice for live sound applications.

The EVI-28 is equipped with dual high-frequency compression drivers that contribute to a well-balanced sound across the frequency spectrum. These drivers offer a smooth response and deliver crisp, detailed highs, which are crucial for vocals and other high-frequency content. The low-frequency performance is powered by dual 8-inch woofers, designed to provide deep and punchy bass response. Together, these components ensure that the EVI-28 can handle a wide range of musical genres and live performances with ease.

Another notable characteristic of the EVI-28 is its rugged build quality and aesthetic design. Housed in a durable enclosure, the speaker is engineered to withstand the rigors of touring and constant transportation while maintaining its performance integrity. The attractive cabinet design not only enhances the overall look of the installation but also allows for various mounting options, giving sound engineers and venue managers flexibility in setup.

The EVI-28 also incorporates advanced acoustic engineering principles, including optimized porting and tuning, which further enhance its low-end performance. The power handling capacity of the EVI-28 is impressive, making it suitable for high-output applications, where clean and loud sound is a necessity.

In summary, the Electro-Voice EVI-28 stands out as a robust loudspeaker that combines cutting-edge technologies with practical features. Its exceptional sound dispersion, high-quality driver components, and durable construction make it a preferred choice for professionals looking for reliable audio solutions in a variety of environments. With the EVI-28, users can expect a compelling audio experience that meets the demands of both performers and audiences alike.