Electro-Voice Sx80 User manual

Description
The Electro-Voice Sx80T is a compact, two-
way, high-efficiency, constant-directivity
speaker system for sound reinforcement and
monitoring. The small size, high sensitivity
and high power-handling capacity of
the Sx80T make it an excellent choice for
use in studios, clubs, bars, theaters or other
applications. An internal, 60-watt line trans-
former with selectable taps allows easy con-
nection to 70-volt or 100-volt speaker lines
in distributed systems.
Through extensive use of computer-aided
design and modeling, Electro-Voice engi-
neers have developed a state-of-the-art pro-
fessional loudspeaker system.
Thehigh-frequencysectionoftheSx80Tuti-
lizes a molded-in 90° x 65° constant-direc-
tivity 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 pat-
tern 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
Sx80T is the cabinet. Constructed of high-
impact polystyrene it provides a stiff and
extremely durable enclosure. The cabinet
includesM6 threaded inserts for the optional
Sx80MB U-bracket.
It also has inserts for installing with an
OmniMount®Series 75 mounting system.
The Sx80T’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.
A self-resetting high-frequency protection
circuit, EV’s PRO™ circuit, is included with
theSx80Ttopreventagainstaccidentalover-
drive 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 Sx80T 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 Sx80T 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 Sx80T crossover includes the Electro-
Voice automatically resetting PRO™circuit
for high-frequency driver protection. This
circuit permits short-term transients to pass,
Sx80T
Two-Way Speaker System
with Transformer
• 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™) for
increased intelligibility
• 60-watt transformer with selectable
taps
• Molded-in attachment points allow for
use with brackets
• Available in paintable black (Sx80TB)
or white (Sx80TW)

Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
2
but protects the tweeter from long-term
powerextremes that would normally destroy
the tweeter.
Enclosure Construction
The Sx80T enclosure is contructed of very-
durableHigh-impact polystyrene that is hard
to dent, scratch, or break. This enclosure
allows for molded in attachment points for
the optional Sx80MB mounting bracket
or for use with an OmniMount® Series
75 mounting system.
The enclosure is paintable to match any de-
cor. It is recommended, however,thatasmall
area should be tested with the desired paint
in order to ensure that there are no adverse
effects and that the paint has sufficient ad-
hesion. 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
thewide and smooth overall response shown
in Figure 1. This response was measured at
1 meter (3.281 feet), using a 2.83-volt swept
sine-wave input in a full-space anechoic
chamberusingtheinternalpassivecrossover.
No external equalization was used.
Figure 1 also shows the half-space measure-
ment of the Sx80T 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.
Connections
The Sx80T is equipped with barrier strip
connectors with a cover. Care should be
taken to ensure that the correct polarity is
observed when connecting the Sx80T. The
barrier strip is marked with + for positive
and - for negative.
Constant-Directivity Speaker System
The crossover frequency and speaker com-
ponentgeometries have been selected so that
the directional characteristics of the woofer
andconstant-directivityhigh-frequencyhorn
match at the crossover frequency to create a
special system type, the constant-directivity
system. At higher frequencies the horizon-
talcoveragepattern 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 char-
acteristic also helps avoid early reflections
fromnearbyfloororside-wallsurfaceswhich
could degrade performance. The controlled
directivity of the high- and low-frequency
transducers also eliminates response irregu-
larities caused by diffraction off nearby en-
closure 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 Sx80T is the con-
stant-directivity dispersion provided by the
90° x 65° horn. The polar response of the
system at selected one-third-octave band-
widths 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 represen-
tative of the polar response of the system.
Beamwidth of the system utilizing the com-
plete one-third-octave polar data is shown
in Figure 3. Directivity factor, RQ, and di-
rectivity index, Di, are plotted in Figure 4.
Power-Handling Capacity
Electro-Voice components and systems are
manufactured to exacting standards, ensur-
ing 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 me-
chanical capabilities of the components.
Electro-Voice will support relevant addi-
tional 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 Sx80T 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 volt-
age amount. For the Sx80T, 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 “av-
erage” power-handling capacity, and is a
peakthatcan be sustained for only a few mil-
liseconds. However, this sort of short dura-
tion peak is very typical in speech and mu-
sic. Provided the amplifier can reproduce
the signal accurately, without clipping, the
woofer will also perform accurately and re-
liably, even at these levels.
Service
In the unlikely event the Sx80T requires ser-
vice, the woofer can be removed from the
front. The high-frequency driver can be re-
moved by separating the front and the rear
halvesoftheenclosureandremovingthebolt
that attaches the driver to the rear. A service
data sheet is available from Electro-Voice.
Suspending Sx80T Enclosures
WARNING: Suspending any object is po-
tentially 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 Sx80T be sus-
pended taking into account all current na-

Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
3
tional, federal, state, and local regulations.
It is the responsibility of the installer to en-
sure the Sx80T is safely installed in accor-
dancewith all such regulations. IftheSx80T
is suspended, Electro-Voice strongly recom-
mends that the system be inspected at least
once a year. If any sign of weakness or dam-
age is detected, remedial action should be
taken immediately.
The Sx80T enclosure contains seven M6 in-
serts and (see Figure 6) which are built into
the enclosure for the purpose of suspension.
These inserts can be used with either the
Sx80MB mounting bracket from Electro-
Voice, or with an OmniMount®Series 75
mounting system.
Sx80MB
The Sx80MB is a universal U-bracket de-
signed to allow the suspension of the Sx80T
at any angle and orientation from the wall or
ceiling (See Figures 6 and 8). It uses M6
inserts on the top and the bottom of the en-
closure. 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 lo-
cated on the rear of the Sx80T for use with
the OmniMount®Series 75 support system.
A safety chain should be used to ensure safe
operation. Full instructions for the
OmniMount®Series 75 can be obtained
from:
OmniMount Systems Inc.
8201 South 48th Street
Phoenix, AZ 85022
Tel: [phone]
Fax: [phone]
Transformer Settings
A transformer and power selector switch are
installed in the rear of the enclousre. The
leveloftheSx80Tmaybeadjestedbychang-
ing the switch setting using a screwdriver.
Turning the switch clockwise increases the
power. Sincethesameswitchand transformer
areused for eitherthe100-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 ex-
cessive power driving the Sx80T or exces-
sive distortion.
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
DH2005high-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-equal-
ize network with protection for the high-fre-
quency driver. The loudspeaker shall meet
the following performance criteria: fre-
quency response of 65 to 20,000 Hz, -3 dB;
maximum power handling of 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-
downhorizontal 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; cross-
over frequency of 2,200 Hz; nominal imped-
ance 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
292mm(11.5in.)widex240mm(9.45in.)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 Sx80TB (black) or Sx80TW
(white).
Uniform Limited Warranty
Electro-Voice products are guaranteed
against malfunction due to defects in mate-
rials or workmanship for a specified period,
as noted in the individual product-line
statement(s)below,or in the individual prod-
uct data sheet or owner’s manual, beginning
with the date of original purchase. If such
malfunction occurs during the specified pe-
riod, 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 fin-
ish or appearance; (b) certain specific items
described in the individual product-line
statement(s)below,or in the individual prod-
uct data sheet or owner’s manual; (c) mal-
function 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 Electro-
Voice Service or any of its authorized ser-
vice representatives. Obtaining Warranty
Service: To obtain warranty service, a cus-
tomer must deliver the product, prepaid, to
Electro-Voice Service or any of its autho-
rized service representatives together with
proof of purchase of the product in the form
of a bill of sale or receipted invoice.
Incidental and Consequential Damages
Excluded:Product repair or replacement
and return to the customer are the only reme-
dies provided to the customer. Electro-Voice
shall not be liable for any incidental or conse-
quentialdamagesincluding,without limitation,
injury to persons or property or loss of use.
Some 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 Sys-
temsare guaranteed against malfunctiondue
to defects in materials or workmanship for a
periodoffive(5)yearsfromthedateoforigi-

Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
4
nalpurchase.The Limited Warrantydoes not
apply to burned voice coils or malfunctions
such as cone and/or coil damage resulting
from improperly designed enclosures. Elec-
tro-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 Uni-
form Limited Warranty statement.
Electro-Voice Electronics are guaranteed
against malfunction due to defects in mate-
rials or workmanship for a period of three
(3) years from the date of original purchase.
Additional details are included in the Uni-
form Limited Warranty statement.
For warranty repair, service information, or
a listing of the repair facilities nearest you,
contact the service repair department at:
Figure 1— Sx80T Axial Frequency
Response, (full space and half space
anechoic environment, 1 watt (2.83
volts) /1 meter (3.281 feet)
Fullspace
Halfspace
800/685-2606 or 501/354-0111.
Fortechnical assistance, contact Technical
Support at 866/78AUDIO.
M-F, 8:00 a.m. to 5:00 p.m. Central Stan-
dard time.

Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
5
Figure 2—Sx80T One-Third-Octave
Polar Responses (full space anechoic
environment, 4 volts/6.10 meters (20
feet)
HORIZONTAL
VERTICAL
5 dB per division
Figure 3—Sx80T Beamwidth vs.
Frequency (full-space anechoic
environment)

Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
6
Figure 5—Sx80T Harmonic Distortion
Response 10% Rated Power Input (17.5
watts), (full-space anechoic environ-
ment, 3.05 meters (10 feet) on axis)
Figure 4— Sx80T Directivity vs.
Frequency (full-space anechoic
environment)

Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
7
Figure 7— Sx80T enclosure with
Sx80MBwall/ceiling mounting bracket.
Figure 6— Sx80T Dimensions and
Inserts

Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
8
SPEAKER - Two-Way w/TransformerPart Number 535143 — Rev B
12000 Portland Avenue South, Burnsville MN 55337
952/884-4051, 952/884-0043 Fax
©Telex Communications, Inc., 1999 • Litho in U.S.A.
Specifications
Typical Axial Frequency Response,
Swept Sine Wave, 4 volts at 3.05
meters (10 feet), (half-space, normal-
ized for 1 watt at 1 meter; see Figure
1):
65-20,000 Hz
Low-Frequency 3-dB-Down Point:
65 Hz
Usable Low-Frequency Limit
(10-dB-down point):
51 Hz
Half Space Reference Efficiency:
1.2 %
Long-Term Average Power-Handling
Capacity per EIA Standard RS-426-A
1980 (see Power-Handling Capacity
section):
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 Re-
sponses, 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
Crossover Frequency:
2,200 Hz
Crossover Slope,
12 dB per octave
Impedance:
Power Impedance
Tap 100-volt 70-volt
60 W 167 Ω83 Ω
30 W 333 Ω167 Ω
15 W 667 Ω333 Ω
7.5 W 1,350 Ω667 Ω
3.8 W 2,700 Ω1,350 Ω
1.9 W 5,400 Ω2,700 Ω
Input Connections,
Sx80T:
Barrier Strip with Cover
Driver Protection, High Frequency:
Solid-state self-resetting circuit (PROJ
circuit) drops output 6 dB; blocking
capacitor with 800-Hz corner fre
quency and 6-dB-per-octave slope
Materials,
Enclosure:
Injection-molded high-impact
polystyrene, black or white
Grille:
Perforated metal grille matches
enclosure color
Dimensions (see Figure 6)
Height:
400 mm (15.75 in.)
Width:
292 mm (11.49 in.)
Depth:
240 mm (9.45 in.)
Net Weight:
9.3 kg (20.5 lb)
Shipping Weight:
11.1 kg (24.5 lb)
Optional Accessories:
Sx80MB installation kit, black or white
Attachment Points:
Seven M6 and four M5 metric inserts
(see Figures 6, 7, and Suspending
Sx80T Enclosures section)