SX80 Sx80PI, Sx80PIX

User Manual: Sx80PI, Sx80PIX

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Sx80PI
Sx80PIX
Weather Resistant
Two-Way Speaker Systems
• 8-inch woofer and DH2005 compression driver for great sound and
reliable performance
• Constant-directivity 90° x 65° highfrequency horn with VariPath™
geometry for uniform coverage
• Ring-Mode Decoupling (RMD™) for
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

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, constantdirectivity speaker system for permanent installation. The Sx80PIX is the same as the
Sx80PI with the addition of an internal, 60watt 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 design 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-directivity horn. This unique pattern contributes to high intelligibility and aims the speakers output where it is most useful. Vocals
sound natural yet "cut through" in reverberant, noisy rooms. In addition, the coverage
pattern is unusually uniform over its range
of operation. The horn's unique, VariPathTM
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 highimpact 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-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 highfrequency performance. The voice coil is
coupled to the diaphragm with EV’s exclusive Resonant Drive™ Technology. This increases and smooths the high-frequency response and reduces the amount of internal
equalization required for flat frequency response, which extends to 20,000 Hz.
A self-resetting high-frequency protection
circuit, EV’s PRO™ circuit, is included with
the Sx80PI to prevent against accidental

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 installed 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 mechanical 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 intended sound to be heard by the audience.
High-Frequency Protection Circuit
The Sx80PI crossover includes the ElectroVoice automatically resetting PRO™ circuit
for high-frequency driver protection. This
circuit permits short-term transients to pass,

Sx80PI Two-Way Speaker System With Transformer

Sx80PI Two-Way Speaker System With Transformer

but protects the tweeter from long-term
power extremes that would normally destroy
the tweeter.
Enclosure Construction
The Sx80PI enclosure is contructed of verydurable High-impact polystyrene that is hard
to dent, scratch, or break. This enclosure
allows for molded in attachment points for
the optional Sx80MB mounting bracket,
Sx80SM stand mount, or for use with a
OmniMount® Series 75 mounting system.
The enclosure is paintable to match any decor. It is recommended, however, that a small
area should be tested with the desired paint
in order to ensure that there are no adverse
effects and that the paint has sufficient adhesion. Care should be taken not to get paint
onto the woofer cone or into the horn throat.
Frequency Response
The combination of a 203-mm (8-inch)
woofer, a wide-bandwidth high-frequency
driver and an equalized crossover results in
the wide and smooth overall response shown
in Figure 1a. This response was measured
at 1 meter (3.281 feet), using a 2.83-volt swept
sine-wave input in a full-space anechoic chamber using the internal passive crossover. No
external equalization was used.
Figure 1a also shows the half-space measurement of the Sx80PI loudspeaker. This curve
gives an indication of how the system will
respond when mounted on a wall, which is a
likely application. This response was also
measured at 1 meter (3.281 feet), using a
2.83-volt swept sine-wave input using the
internal passive crossover. No external
equalization was used.
Figure 1b shows the full and half space
measurments with optional port covers installed.
Port Covers
The two ports, between the horn and the
woofer, may be "sealed" in order to add further weather protection to the system. These
optional plastic port covers are included with
the system for use in situations where increased weather resistance is needed. This
will help prevent any moisture from wicking
through the foam- and mesh-backed grille
2

and accumulating inside the enclosure under extreme weather conditions. The optional port covers and instructions are supplied with each system. It should be noted,
however, that once the port covers are installed, the frequency response will change
to that shown in Figure 1b.
Connections
The Sx80PI is equipped with barrier strip
connectors with a cover. Care should be
taken to ensure that the correct polarity is
observed when connecting the Sx80PI. The
barrier strip is marked with + for positive
and - for negative.
Constant-Directivity Speaker System
The crossover frequency and speaker component geometries have been selected so that
the directional characteristics of the woofer
and constant-directivity high-frequency horn
match at the crossover frequency to create a
special system type, the constant-directivity
system. At higher frequencies the horizontal coverage pattern remains constant and the
vertical pattern smoothly transitions to a 90°
angle above 5,000 Hz. Response within the
90° x 65° rated coverage angle is uniform,
which means dependable audience coverage
without “hot spots” or dead zones at certain
frequencies. The 90° x 65° dispersion characteristic also helps avoid early reflections
from nearby floor or side-wall surfaces which
could degrade performance. The controlled
directivity of the high- and low-frequency
transducers also eliminates response irregularities caused by diffraction off nearby enclosure edges and, in combination with an
essentially flat on-axis frequency response,
produces a total acoustic power output that
is uniform with frequency.
Directivity
A unique feature of the Sx80PI is the constant-directivity dispersion provided by the
90° x 65° horn. The polar response of the
system at selected one-third-octave bandwidths is shown in Figure 2. These polar
responses were measured in a full-space
anechoic environment at 6.1 meters (20 feet)
using one-third-octave pink-noise inputs.
The frequencies selected are fully representative of the polar response of the system.

Beamwidth of the system utilizing the complete one-third-octave polar data is shown
in Figure 3. Directivity factor, RΘ, and directivity index, Di, are plotted in Figure 4.
Power-Handling Capacity
Electro-Voice components and systems are
manufactured to exacting standards, ensuring they will hold up, not only through the
most rigorous of power tests, but also
through continued use in arduous, real-life
conditions. The EIA Loudspeaker Power
Rating Full Range (ANSI/EIA RS-426-A
1980) uses a noise spectrum which mimics
typical music and tests the thermal and mechanical capabilities of the components.
Electro-Voice will support relevant additional standards as and when they become
available. Extreme, in-house power tests,
which push the performance boundaries of
the woofers, are also performed and passed
to ensure years of trouble-free service.
Specifically, the Sx80PI passes ANSI/EIA
RS-426-A 1980 with the following values:
RSR = 6.21 ohms (1.15 x RE)
RE = woofer DCR = 5.4
PE(MAX) = 175 watts
Test voltage = 32.97 volts rms,
65.93 volts peak (+6dB)
The “peak” power-handling capacity of a
woofer is determined by the peak test voltage amount. For the Sx80PI, a 65.93-volt
peak test voltage translates into 700-watts
short-term peak power-handling capacity.
This is the equivalent of four times the “average” power-handling capacity, and is a
peak that can be sustained for only a few milliseconds. However, this sort of short duration peak is very typical in speech and music. Provided the amplifier can reproduce
the signal accurately, without clipping, the
woofer will also perform accurately and reliably, even at these levels.
Service
In the unlikely event the Sx80PI requires service, the woofer can be removed from the
front. The high-frequency driver can be removed by separating the front and the rear
halves of the enclosure and removing the bolt
that attaches the driver to the rear. A service
data sheet is available from Electro-Voice.

Sx80PI Two-Way Speaker System With Transformer
Stand Mounting

Suspending Sx80PI Enclosures
WARNING: Suspending any object is potentially dangerous and should be attempted
only by individuals who have a thorough
knowledge of the techniques and regulations
of rigging objects overhead. Electro-Voice
strongly recommends that the Sx80PI be suspended taking into account all current national, federal, state, and local regulations.
It is the responsibility of the installer to ensure the Sx80PI is safely installed in accordance with all such regulations. If the
Sx80PI is suspended, Electro-Voice strongly
recommends that the system be inspected at
least once a year. If any sign of weakness or
damage is detected, remedial action should
be taken immediately.
The Sx80PI enclosure contains seven M6 inserts and (see Figure 7) which are built into
the enclosure for the purpose of suspension.
These inserts can be used with either the
Sx80MB mounting bracket from ElectroVoice, or with an OmniMount® Series 75
mounting system.
Sx80MB
The Sx80MB is a universal U-bracket designed to allow the suspension of the Sx80PI
at any angle and orientation from the wall or
ceiling (See Figures 7 and 8). It uses M6
inserts on the top and the bottom of the enclosure. There is an extra M6 insert on the
top of the enclosure for a safety chain. Full
instructions are included in the Sx80MB
engineering data sheet.
OmniMount® Series 75
Four M6 threaded inserts and screws are located on the rear of the Sx80PI for use with
the OmniMount® Series 75 support system.
A safety chain should be used to ensure safe
operation. Full instructions for the
3

OmniMount Systems Inc.
8201 South 48th Street
Phoenix, AZ 85022
Tel: 602/829-8000
Fax: 602/756-9000
Transformer Settings (Sx80PIX)
A transformer and power selector switch are
installed in the rear of the enclousre. The level
of the Sx80PIX may be adjested by changing
the switch setting using a screwdriver. Turning the switch clockwise increases the power.
Since the same switch and transformer are used
for either the 100-volt or 70-volt line, the
power setting depends upon the amplifier output that is used, 100-volt or 70-volt.
CAUTION: When connected to a 100-volt
line, do not use the switch setting marked
“DO NOT USE,” as this may result in excessive power driving the Sx80PI or excessive distortion.
Weather Resistant Mounting
When mounting the Sx80PI in a location
where a weather-resistant system is required,
a minimum of a five-degree down angle is
recommended. (See Figure 10). This will
help prevent any moisture from wicking
through the foam and mesh-baked grille and
accumulating inside the enclosure under extreme weather conditions.
Architects’ and Engineers’
Specifications
The loudspeaker shall consist of a 200-mm
(8.0-in.) low frequency transducer in a
vented, trapezoidal-shaped enclosure: a
DH2005 high-frequency compression driver
with a pure titanium diaphragm coupled to a
90° X 65° constant-directivity horn molded
into the front baffle of the enclosure. The
system will use a passive crossover-equalize network with protection for the high-frequency driver. The loudspeaker shall meet
the following performance criteria: frequency response of 65 to 20,000 Hz, -3 dB;
maximum power handling. Non-transformer
version: 175 watts long term and 700 watts
short term; transformer version: 60 watts
long term and 240 watts short term with

switch selectable taps for 60 W, 30 W, 15 W,
7.5 W, 3.7 W and 1.8 W, with a shaped random-noise input per ANSI/EIA RS-426-A
1980; sensitivity of 92 dB SPL at 1 meter
with a 1-watt, 300-2,000-Hz pink-noise input; 6-dB-down horizontal coverage angle
of 90° + 34°/-27° in the 2,000- to 20,000-Hz
range; 6-dB-down vertical coverage angle of
65° + 31°/- 4° in the 2,000- to 20,000-Hz
range; crossover frequency of 2,200 Hz;
nominal impedance of 8 ohms and minimum
impedance of 7.2 ohms. Input connectors
shall be push pins. The enclosure shall be
constructed of high-impact polystyrene and
fitted with a powder-coated steel grille, and
M6 and M5 threaded inserts for optional accessories. Dimensions shall be 400 mm (15.75
in.) high x 292 mm (11.5 in.) wide x 240 mm
(9.45 in.) deep. Net weight shall be 9.3 kg
(20.5 lb).
The system shall be capable of producing
average sound levels in excess of in the long
term, and short-term peaks.
The loudspeaker system shall be the
Electro-Voice Sx80PI (non transformer) or
Sx80PIX (transformer).
Uniform Limited Warranty
Electro-Voice products are guaranteed
against malfunction due to defects in materials or workmanship for a specified period,
as noted in the individual product-line
statement(s) below, or in the individual product data sheet or owner’s manual, beginning
with the date of original purchase. If such
malfunction occurs during the specified period, the product will be repaired or replaced
(at our option) without charge. The product
will be returned to the customer prepaid.
Exclusions and Limitations: The Limited
Warranty does not apply to: (a) exterior finish or appearance; (b) certain specific items
described in the individual product-line
statement(s) below, or in the individual product data sheet or owner’s manual; (c) malfunction resulting from use or operation of
the product other than as specified in the
product data sheet or owner’s manual; (d)
malfunction resulting from misuse or abuse
of the product; or (e) malfunction occurring
at any time after repairs have been made to
the product by anyone other than ElectroVoice Service or any of its authorized ser-

Sx80PI Two-Way Speaker System With Transformer

The Sx80PI enclosure contains four M5 inserts (see Figures 7 and 9) for the attachment of the optional Sx80SM stand mount
adaptor kit for mounting the Sx80PI on a
1-3/8 in. stand. Please refer to the Sx80SM
engineering data sheet for complete installation instructions.

OmniMount® Series 75 can be obtained
from:

Sx80PI Two-Way Speaker System With Transformer

Sx80PI Two-Way Speaker System With Transformer
vice representatives. Obtaining Warranty
Service: To obtain warranty service, a customer must deliver the product, prepaid, to
Electro-Voice Service or any of its authorized service representatives together with
proof of purchase of the product in the form
of a bill of sale or receipted invoice. A list of
authorized service representatives is available from Electro-Voice Service at 600 Cecil
Street, Buchanan, MI 49107 (800/234/6831
or FAX 616/695/4743). Incidental and
Consequential Damages Excluded: Product repair or replacement and return to the
customer are the only remedies provided to
the customer. Electro-Voice shall not be liable for any incidental or consequential damages including, without limitation, injury to
persons or property or loss of use. Some

Figure 1a— Sx80PI Axial Frequency
Response, (full space and half space
anechoic environment, 1 watt (2.83
volts) /1 meter (3.281 feet) (open ports)
Full space
Half space

Figure 1b— Sx80PI Axial Frequency
Response, (full space and half space
anechoic environment, 1 watt (2.83
volts) /1 meter (3.281 feet) (closed ports)

Full space
Half space

4

states do not allow the exclusion or limitation of incidental or consequential damages
so the above limitation or exclusion may not
apply to you. Other Rights: This warranty
gives you specific legal rights, and you may
also have other rights which vary from state
to state.
Electro-Voice Speakers and Speaker Systems are guaranteed against malfunction due
to defects in materials or workmanship for a
period of five (5) years from the date of original purchase. The Limited Warranty does not
apply to burned voice coils or malfunctions
such as cone and/or coil damage resulting
from improperly designed enclosures. Electro-Voice active electronics associated with
the speaker systems are guaranteed for three
(3) years from the date of original purchase.

Additional details are included in the Uniform Limited Warranty statement.
Electro-Voice Electronics are guaranteed
against malfunction due to defects in materials or workmanship for a period of three
(3) years from the date of original purchase.
Additional details are included in the Uniform Limited Warranty statement.
For warranty repair, service information, or
a listing of the repair facilities nearest you,
contact the service repair department at:
616/695-6831 or 800/685-2606.
For technical assistance, contact Technical
Support at 800/234-6831 or 616/695-6831,
M-F, 8:00 a.m. to 5:00 p.m. Eastern Standard time.

Sx80PI Two-Way Speaker System With Transformer
Figure 2—Sx80PI One-Third-Octave
Polar Responses (full space anechoic
environment, 4 volts/6.10 meters (20
feet)

5 dB per division

HORIZONTAL
VERTICAL

Sx80PI Two-Way Speaker System With Transformer

Figure 3—Sx80PI Beamwidth vs.
Frequency (full-space anechoic
environment)

5

Sx80PI Two-Way Speaker System With Transformer

Sx80PI Two-Way Speaker System With Transformer

Figure 4— Sx80PI Directivity vs.
Frequency (full-space anechoic
environment)

Figure 5—Sx80PI Harmonic Distortion
Response 10% Rated Power Input (17.5
watts), (full-space anechoic environment, 3.05 meters (10 feet) on axis)

Figure 6a— Sx80PI Impedance Curve
(open ports)

6

Sx80PI Two-Way Speaker System With Transformer
Figure 6b— Sx80PI Impedance Curve
(closed ports)

7

Sx80PI Two-Way Speaker System With Transformer

Figure 7— Sx80PI Dimensions and
Inserts

Sx80PI Two-Way Speaker System With Transformer
Figure 9— Sx80PI enclosure with
Sx80SM stand mounting kit.

Sx80PI Two-Way Speaker System With Transformer

Figure 8— Sx80PI enclosure with
Sx80MB wall/ceiling mounting bracket.

Figure 10— Sx80PI Recommended
mounting angle

8

Sx80PI Two-Way Speaker System With Transformer
Specifications

9

Power
Tap

Impedance
100-volt
70-volt

60 W
30 W
15 W
7.5 W
3.8 W
1.9 W

167 Ω
333 Ω
667 Ω
1,350 Ω
2,700 Ω
5,400 Ω

83 Ω
167 Ω
333 Ω
667 Ω
1,350 Ω
2,700 Ω

Input Connections,
Barrier Strip with Cover
Driver Protection, High Frequency:
Solid-state self-resetting circuit
(PRO™ circuit) drops output 6 dB;
blocking capacitor with 800-Hz corner
frequency and 6-dB-per-octave slope
Materials,
Enclosure:
Black injection-molded high-impact
polystyrene, black
Grille:
Black perforated metal grille
Dimensions (see Figure 6)
Height:
400 mm (15.75 in.)
Width:
292 mm (11.49 in.)
Depth:
240 mm (9.45 in.)
Net Weight:
8.2 kg (18 lb) - Sx80PI
9.3 kg (20.5 lb) - Sx80PIX
Shipping Weight:
10.0 kg (22 lb) - Sx80PI
11.1 kg (24.5 lb) - Sx80PIX
Optional Accessories:
Sx80MB black installation kit,
Sx80SM stand mount kit
Attachment Points:
Seven M6 and four M5 metric inserts
(see Figures 7, 8, and 9 and Suspending Sx80PI Enclosures section)

Sx80PI Two-Way Speaker System With Transformer

Versions available:
Sx80PI - two-way, full-range
speaker system (175 watts)
Sx80PIX - two-way, full-range
speaker system with a 2-60 watt
selectable transformer.
Typical Axial Frequency Response,
Swept Sine Wave, 4 volts at 3.05
meters (10 feet), (half-space, normalized for 1 watt at 1 meter; see Figure 1):
65-20,000 Hz (open port)
75-20,000 Hz (closed port)
Low-Frequency 3-dB-Down Point:
65 Hz (open port)
75 Hz (closed port)
Usable Low-Frequency Limit
(10-dB-down point):
51 Hz (open and closed port)
Half Space Reference Efficiency:
1.2 %
Long-Term Average Power-Handling
Capacity per EIA Standard RS-426-A
1980 (see Power-Handling Capacity
section):
Sx80PI:
175 watts
Sx80PIX:
2-60 watts, selectable in 3 dB steps
(transformer-limited)
Maximum Woofer Acoustic Output:
2.1 watts
Sensitivity (SPL at 1 watt, 1 meter
input, half-space, swept sine wave):
92 dB
Nominal Coverage Angle,
Horizontal: 90°
Vertical: 65°
Dispersion Angle Included by
6-dB-Down Points on Polar Responses, Indicated One-Third-Octave
Bands of Pink Noise (see Figure 3),
2,000-20,000 Hz, Horizontal:
90° (+34°, -27°)
2,000-20,000 Hz, Vertical:
65° (+31°, -4°)

Directivity Factor RΘ(Q), 800- to
16,000-Hz Median (see Figure 4):
8.3 (+5.7, -4.9)
Directivity Index Di, 800- to 16,000-Hz
Median (see Figure 4):
9.2 dB (+2.3 dB, -3.9 dB)
Distortion, 0.1 Full Power Input, (see
Figure 5)
Second Harmonic,
100 Hz:
-21 dB, 9.0%
1,000 Hz:
-55 dB, 0.2%
10,000 Hz:
-25 dB, 5.6%
Third Harmonic,
100 Hz:
-26 dB, 4.9%
1,000 Hz:
-41 dB, 0.9%
10,000 Hz:
-47 dB, 0.5%
Transducer Complement,
High Frequency:
DH2005 driver
Low-Frequency:
203-mm (8-in.) woofer
Box Tuning Frequency:
70 Hz (open port)
Crossover Frequency:
2,200 Hz
Crossover Slope,
12 dB per octave
Impedance,
Sx80PI;
Nominal:
8 ohms
Minimum:
7.2
Sx80PIX;

Sx80PI Two-Way Speaker System With Transformer

Sx80PI Two-Way Speaker System With Transformer

10

Sx80PI Two-Way Speaker System With Transformer

Sx80PI Two-Way Speaker System With Transformer

11

Sx80PI Two-Way Speaker System With Transformer

Sx80PI Two-Way Speaker System With Transformer

600 Cecil Street, Buchanan, MI 49107
616/695-6831, 616/695-1304 Fax
SPEAKER - Two-Way w/Transformer
12

©Telex Communications, Inc., 1999 • Litho in U.S.A.

Part Number 535144 — 9909



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