Electro-Voice EVI-28 - Manual

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 - i n c h ) d i r e c t r a d i a t o r s i n a c o m p a c t

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

l o w e r c e i l i n g s t h a n a p p l i c a b l e f o r t h e

EVI-12 and EVI-15, and as a complemen-

t a r y 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

t h r o a t , w i d e - b a n d w i d t h , t i t a n i u m - d i a -

phragm compression driver. This driver

uses a unique, convex-drive Time Path

TM

p h a s i n g p l u g s t r u c t u r e ( U . S . P a t e n t

#4,525,604). The voice coil is coupled to

the diaphragm with EV’s exclusive Reso-

nant Drive

TM

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 PRO

TM

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

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

1. The use of Vari Intense

®

horns is protected by U.S. patent

#5,020,630.