Electro-Voice SX80T User Manual
Sx80T
Two-Way Speaker System
with Transformer
• 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
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)
™
™
) for
Description
The Electro-V oice Sx80T is a compact, twoway, 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 transformer with selectable taps allows 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.
The high-frequency section of the Sx80T 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. V ocals 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, VariPath
throat geometry helps direct driver output to
the corners of the room, to points of coverage not described in the usual specifications
TM
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 highimpact polystyrene it provides a stiff and
extremely durable enclosure. The cabinet
includes M6 threaded inserts for the optional
Sx80MB U-bracket.
It also has inserts for installing with an
OmniMount
The Sx80T’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 Sx80T to prevent against accidental overdrive and improve system reliability. If the
®
Series 75 mounting system.
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 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 Sx80T 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 Sx80T crossover includes the ElectroVoice automatically resetting PRO™
for high-frequency driver protection. This
circuit permits short-term transients to pass,
circuit
Sx80T Two- Way Speaker System With Transformer
but protects the tweeter from long-term
power extremes that would normally destroy
the tweeter.
Enclosure Construction
The Sx80T 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
or for use with an 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
Sx80T Two-Way Speaker System With Transformer
driver and an equalized crossover results in
the wide 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
chamber using the internal passive crossover.
No external equalization was used.
Figure 1 also shows the half-space measurement 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 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 Sx80T 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, R
rectivity index, D
, are plotted in Figure 4.
i
and di-
Q,
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 Sx80T passes ANSI/EIA
RS-426-A 1980 with the following values:
R
= 6.21 ohms (1.15 x RE)
SR
= woofer DCR = 5.4
R
E
= 175 watts
P
E(MAX)
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 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 “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 Sx80T 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.
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 r ecommends that the Sx80T be suspended taking into account all current na-
2
Sx80T Two- Way Speaker System With Transformer
tional, federal, state, and local regulations.
It is the responsibility of the installer to ensure the Sx80T is safely installed in accordance with all such regulations. If the Sx80T
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 Sx80T enclosure contains seven M6 inserts 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 ElectroVoice, or with an OmniMount
®
Series 75
mounting system.
Sx80MB
The Sx80MB is a universal U-bracket designed 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 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 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: 602/829-8000
Fax: 602/756-9000
Transformer Settings
A transformer and power selector switch are
installed in the rear of the enclousre. The
level of the Sx80T 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 Sx80T or excessive 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
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 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 randomnoise input per ANSI/EIA RS-426-A 1980;
sensitivity of 92 dB SPL at 1 meter with a 1watt, 300-2,000-Hz pink-noise input; 6-dBdown horizontal coverage angle of 90° + 34°/
-27° in the 2,000- to 20,000-Hz range; 6-dBdown 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 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 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
W arranty 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 service 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.
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 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-V oice 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 origi-
Sx80T Two-Way Speaker System With Transformer
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