Filter
Top Products
Sx80T Two-Way Speaker System With Transformer
Sx80T Two-Way Speaker System With Transformer
2
but protects the tweeter from long-term
power extremes that would normally destroy
the tweeter.
Enclosure Construction
The Sx80T enclosure is contructed of very-
durable 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 de-
cor. 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 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
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 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-
ponent 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 horizon-
tal 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 char-
acteristic 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 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, R
Q,
and di-
rectivity index, D
i
, 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:
R
SR
= 6.21 ohms (1.15 x R
E
)
R
E
= woofer DCR = 5.4
P
E(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
peak that can 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
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 recommends that the Sx80T be sus-
pended taking into account all current na-