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-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 Path TM
phasing plug structure (U.S. Patent
#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.