Electro-Voice Sx80PI Manual

Description
The Sx80PI and Sx80PIX are continuations
of the popular Sx80 speaker offering the
added value of weather-resistant cabinets.
The Electro-Voice Sx80PI is a 175-watt,
compact, two-way, high-efficiency, constant-
directivity speaker system for permanent in-
stallation. The Sx80PIX is the same as the
Sx80PI with the addition of an internal, 60-
watt line transformer with selectable taps.
This allows for easy connection to 70-volt or
100-volt speaker lines in distributed systems.
Through extensive use of computer-aided de-
sign and modeling, Electro-Voice engineers
have developed a state-of-the-art professional
loudspeaker system for permanent installation
where weather resistance is needed.
The high-frequency section of the Sx80PI
utilizes a molded-in 90° x 65° constant-di-
rectivity horn. This unique pattern contrib-
utes to high intelligibility and aims the speak-
ers output where it is most useful. Vocals
sound natural yet "cut through" in reverber-
ant, noisy rooms. In addition, the coverage
pattern is unusually uniform over its range
of operation. The horn's unique, VariPath
throat geometry helps direct driver output to
the corners of the room, to points of cover-
age not described in the usual specifications
of horizontal 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
Sx80PI is the cabinet. Constructed of high-
impact polystyrene it provides a stiff and
extremely durable enclosure. The cabinet
includes M6 threaded inserts for the optional
Sx80MB U-bracket and M5 threaded inserts
for the optional Sx80SM stand mount adaptor
kit. It also has inserts for installing with an
®
OmniMount Series 75 mounting system.
The Sx80PI's high-frequency horn is driven
by the DH2005 one-inch throat, wide-band-
width, 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 exclu-
sive Resonant Drive™ Technology. This in-
creases and smooths the high-frequency re-
sponse and reduces the amount of internal
equalization required for flat frequency re-
sponse, which extends to 20,000 Hz.
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A self-resetting high-frequency protection
circuit, EV's PRO™ circuit, is included with
the Sx80PI to prevent against accidental
Sx80PI
Sx80PIX
Weather Resistant
Two-Way Speaker Systems
• 8-inch woofer and DH2005 compres-
sion driver for great sound and
reliable performance
• Constant-directivity 90° x 65° high-
frequency horn with VariPath
geometry for uniform coverage
• Ring-Mode Decoupling (RMD
increased intelligibility
• 175-watt long term rms power
capacity (Sx80PI)
• 60-watt transformer with selectable
taps (Sx80PIX)
• Molded-in attachment points allow for
use with brackets or a stand mount
overdrive and improve system reliability. If
the input power to the high-frequency driver
exceeds the nominal rating, the protection
circuit is activated 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 reduced to a safe level.
The low-frequency section of the Sx80PI is a
203-mm (8-in.) direct radiating woofer in-
stalled in an optimally-vented enclosure. This
results in exceptionally extended bass response
and high efficiency in a very small cabinet.
Ring-Mode Decoupling (RMD
Technology
The Sx80PI controls both acoustical and me-
chanical ring modes to provide dramatically
increased 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 in-
tended sound to be heard by the audience.
High-Frequency Protection Circuit
The Sx80PI crossover includes the Electro-
Voice automatically resetting PRO™ circuit
for high-frequency driver protection. This
circuit permits short-term transients to pass,
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