Sx
500PI+
400-Watt Two-Way
Weather-Resistant
Speaker System
• Ring-Mode Decoupling (RMD
TM
) Technol-
ogy for increased intelligibility
• Black powder - coated, full-face stainless
steel grille with foam backing and a
polyester mesh water shield.
• Durable structural-foam enclosure with
integral handles, stand mount and
molded-in attachment points for secure
suspension with optional brackets
• DL15Sx-W 15-inch woofer and DH2T
compression driver for great sound and
reliable performance
• Asymmetric constant-directivity
75° x 60° high-frequency horn
• Asymmetric horn-loaded woofer section
• 400-watt long-term rms power capacity
• Passive network with biamp capability
Description
The Electro-Voice is a weather-resis-
tant version of the popular Sx500+ loudspeaker.
It is a 400-watt, 15-inch two-way, biampable,
high-efficiency, constant-directivity speaker
system featuring a vented-horn woofer section.
The weather-resistant features are the specially
treated woofer, the DL15Sx-W, and the full-face
stainless-steel grille backed with both foam and
a polyester mesh water shield. Additionally, two
port plugs are included for the customer to in-
stall when increased weather resistance is
needed. Through extensive use of computer-
aided design and modeling, Electro-Voice en-
gineers have developed a state-of-the-art pro-
fessional loudspeaker system for permanent in-
stallations where weather resistance is needed.
The high-frequency section of the uti-
lizes a molded-in 75° x 60° constant-directivity
horn which is aimed downward by 10°. This
unique pattern contributes to high intelligibility
and aims the speaker's output where it is most
useful. Vocals sound natural yet “cut through”
in reverberant, noisy rooms. In addition, the cov-
erage pattern is unusually uniform over its range
of operation. The horn’s unique, VariPath
TM
throat geometry helps direct driver output to the
corners of the room, to points of coverage not
described in the usual specifications of horizon-
tal and vertical coverage angles, and to parts of
the audience that typically do not receive the
strongest coverage.
One of the many other unique features of the
is the cabinet. Constructed of high-
impact polypropylene structural foam, it pro-
vides a stiff and extremely durable enclosure.
The cabinet includes integral carrying handles
and a stand socket for mounting on 1
3
/
8
-inch
stands such as the Electro-Voice 100BK. Rubber
feet that are attached to the bottom of the cabinet
and mating sockets that are molded into the top
provide a means of stacking systems. The shaped
plastic cabinet, in combination with the uniform,
75° x 60° directivity characteristics, make the
ideal for use alone or in arrays.
The ’s high-frequency horn is driven
by the DH2T one-inch throat, wide-bandwidth,
titanium-diaphragm driver. This driver uses a
unique, convex-drive Time Path
™
phasing plug
structure (U.S. Patent #4,525,604) for smooth
and extended high-frequency performance. The
voice coil is coupled to the diaphragm with EV’s
exclusive Resonant Drive™ Technology. This
increases and smooths the high-frequency re-
sponse and reduces the amount of internal equal-
ization required for flat frequency response,
which extends to 20,000 Hz.
A self-resetting high-frequency protection cir-
cuit, EV’s PRO™ circuit, is included with the
to prevent against accidental over-
drive and improve system reliability. If the in-
put power to the high-frequency driver exceeds
the nominal rating, the protection circuit is acti-
vated and reduces the power delivered to the
driver by 6 dB. The system will remain in this
mode of operation until the input power is re-
duced to a safe level.
The bass section of the Sx500+ is a vented-horn
design using Thiele-Small parameters for solid
performance to 45 Hz. This horn provides di-
rectivity control for the woofer section and
matches the asymmetry of the high-frequency
section. The 381-mm (15-in.) DL15Sx-W
weather-resistant woofer used is a specially de-
signed unit featuring an extended-length voice
coil and high-temperature construction materi-
als. The system combines professional-quality
components, arranged in an unusually durable
Thiele-Small-aligned vented enclosure. The re-
sult is clear and articulate, high-quality sound.
Ring-Mode Decoupling (RMD
TM
)
Technology
The controls both acoustical and me-
chanical ring modes to provide dramatically
in-
creased intelligibility, using techniques learned
from the development of the Electro-Voice
X-Array™ concert speakers. There is much less
coloration of the sound from resonating
sources, leaving only the intended sound to be
heard by the audience. The most obvious imple-
mentation of RMD™ in the is the
foam attached to the back of the woofer grille.
Speaker Protection
The like all other vented systems ex-
periences rapidly increasing cone excursion
