Electro-Voice Sx300PIX Manual de Usario

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Description
The Electro-Voice Sx300 is a 300-watt,
12-inch two-way, high-efficiency, con-
stant-directivity compact speaker system
with Ring-Mode Decoupling (RMDTM).
Through the extensive use of computer-aided
design and modeling, Electro-Voice engi-
neers have developed a state-of-the-art pro-
fessional loudspeaker system.
The high-frequency section of the Sx300
utilizes a molded-in, 65° x 65° constant-di-
rectivity horn. This unique pattern contrib-
utes to high intelligibility. Vocals sound natu-
ral yet “cut through” in reverberant, noisy
rooms. In addition, the coverage pattern is
unusually uniform over its range of opera-
tion. Sound quality off axis is very well
maintained, even at 45° off axis (a 90° total
coverage angle), well beyond the rated cov-
erage angle. The horn’s unique, VaripathTM
throat geometry helps direct driver output to
the corners of the room, points of coverage
not described in the usual specifications of
horizontal and vertical coverage angles, and
parts of the audience that typically do not
receive the strongest coverage.
One of the many other unique features of
the Sx300 is the cabinet. Constructed of high-
impact polypropylene structural foam, it pro-
vides a stiff and extremely durable enclo-
sure. Molded into the cabinet are an integral
carrying handle and a stand socket for
mounting on 1 3/8-inch stands such as the
Electro-Voice 100BK. Rubber feet that are
attached to the bottom of the cabinet and mat-
ing sockets that are molded into the top pro-
vide a means of stacking systems. The trap-
ezoidal-shaped cabinet, in combination with
the uniform, 65° x 65° directivity character-
istics, make the Sx300 ideal for use alone or
in arrays.
In situations requiring additional bass out-
put, the Sx300 can be used in combination
with the Electro-Voice Xp200A system con-
troller. The Xp200A includes a low-fre-
quency enhancement circuit that is tailored
to match the low-frequency characteristics
of the Sx300. Up to 12 dB of additional bass
output can be obtained from the system when
used with the Xp200A system controller. The
amount of low-frequency enhancement can
be adjusted to suit the users personal pref-
erence.
For the most demanding situations, two bass-
module models are available to complement the
Sx300: the Electro-Voice Sb121 nonpowered
bass module and the Electro-Voice Sb121a pow-
ered bass module. Both bass modules were de-
signed to be used with the Sx300 and are
constructed in similar structural foam enclo-
sures. The Sb121a includes a 300-watt power
amplifier that is built into the speaker cabi-
net. The Xp200A system controller provides
a subwoofer output that is a crossed-over
sum of the left and right channels.
The Sx300’s high-frequency horn is driven
by the DH2010A one-inch-throat, wide-
bandwidth, titanium-diaphragm driver. The
DH2010A uses a unique, convex-drive
Time PathTM phasing plug structure (U.S.
Patent #4,525,604) for smooth and ex-
tended high-frequency performance. The
voice coil is coupled to the diaphragm with
EV’s exclusive Resonant DriveTM technol-
ogy. This increases and smooths the high-
frequency response and reduces the amount
of internal equalization required for flat fre-
quency response. Driver output extends to
25,000 Hz. A self-resetting high-frequency
protection circuit, EV’s PROTM circuit, is
included with the Sx300 to prevent against
accidental overdrive and improve system
reliability. If the input power to the high-fre-
quency driver exceeds the nominal rating,
the protection circuit is activated and reduces
Sx300
300-Watt Two-Way
Compact Speaker
System
Ring-Mode Decoupling (RMDTM) for
increased intelligibility
Durable structural-foam enclosure with
integral handles and stand mount
DL12Sx 12-inch woofer and DH2010A
compression driver for great sound and
reliable performance
Molded-in constant-directivity 65° x 65°
high-frequency horn
Stand mountable and arrayable
Molded-in attachment points for secure
suspension with optional brackets
Dual Neutrik Speakon® high-current
connectors (Sx300E) or 1/4-in. phone
jacks (Sx300P)
Also available in white (Sx300W)
1. Speakon® is a registered trademark of Neutrik Inc.
Sx300 300-Watt Two-Way Compact Speaker System
Sx300 300-Watt Two-Way Compact Speaker System
the power delivered to the driver by 6 dB.
The system will remain in this mode of op-
eration until the input power is reduced to a
safe level.
The bass section of the Sx300 is designed
using Thiele-Small parameters for efficient
performance to below 80 Hz. The woofer is
a DL12Sx 12-inch Pro-Line unit featuring
beryllium copper lead wires, a low-mass,
edge-wound voice coil and high-temperature
materials. The system combines profes-
sional-quality components, arranged in a
time-coherent vertical array, with an unusu-
ally durable Thiele-Small-aligned vented en-
closure. The result is clear and articulate,
high-quality sound.
Ring-Mode Decoupling (RMDTM)
The Sx300 controls both acoustical and me-
chanical ring modes to provide dramatically
increased intelligibility, using techniques
learned from the development of the Elec-
tro-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.
Frequency Response
The combination of a 12-inch woofer, 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 10 feet, us-
ing a 4-volt input in an anechoic chamber,
and was measured using a swept sine-wave
input. No external equalization was used.
Figure 1 has been averaged and corrected
for 1 watt at 1 meter.
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 horn match at the
crossover frequency to create a special sys-
tem type—the constant-directivity system.
Response within the 65° rated coverage angle
is uniform, which means dependable audi-
ence coverage without “hot spots” or dead
zones at certain frequencies. The 65 disper-°
sion characteristic also helps avoid early re-
flections from nearby floor or side-wall sur-
faces which could degrade performance. The
controlled directivity of the high- and low-
frequency transducers also eliminates re-
sponse irregularities caused by diffraction off
nearby enclosure edges. And, in combina-
tion 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 Sx300 is the con-
stant-directivity dispersion provided by the
65° x 65° horn. The polar response of the
system at selected one-third-octave band-
widths is shown in Figure 2. These polar re-
sponses were measured in an anechoic envi-
ronment at 10 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 uti-
lizing the complete one-third-octave polar
data is shown in Figure 3. Rq and directivity
index (Di) are plotted in Figure 4.
Suspending Sx300 Enclosures
WARNING: Suspending any object is po-
tentially dangerous and should only be at-
tempted by individuals who have a thorough
knowledge of the techniques and regula-
tions of rigging objects overhead. Electro-
Voice strongly recommends that the Sx300
be suspended taking into account all cur-
rent national, federal, state and local regu-
lations. It is the responsibility of the installer
to ensure the Sx300 is safely installed in
accordance with all such regulations. If the
Sx300 is suspended, Electro-Voice strongly
recommends that the system be inspected
at least once a year. If any sign of weak-
ness or damage is detected, remedial action
should be taken immediately.
A manual entitled Suspending System 2000TM
Loudspeakers is included with every Sx300
system. It gives a summary of the suspen-
sion kits available and an idea of how each
kit is used. A brief overview, which illus-
trates some approaches for single and mul-
tiple suspension, is given here for the ben-
efit of the system designer. Please refer to
individual suspension kit engineering data
sheets for full details and safety information.
The first approach is to suspend an indi-
vidual Sx300 enclosure. The four metric
M8 x 1.25 inserts (see Figure 5) which are
built into the enclosure allow the system
to be suspended using eyebolts (Mb100
forged eyebolt attachment kit). Typically
it will be necessary to attach two cables to
the top eyebolt and “pull up” on the rear. The
Mb200 wall/ceiling mounting bracket (see
Figure 7) encompasses the top and bottom
of the enclosure and has additional features
to make suspending the Sx300 easier and
more flexible. Electro-Voice recommends the
use of the Mb200 in all but the simplest situ-
ations. The Mb200 has supplementary holes
to allow the Sx300 to be attached to a wall
or ceiling and aimed at an audience.
The Mb200 bracket also allows the use of
OmniMount® Series 100 mounting hardware
by providing three-hole-pattern groups com-
patible with these support systems. When
OmniMount® Series 100 mounting hardware
is specified, the Mb200 bracket must first
be attached to the speaker enclosure.
The second approach is to suspend multiple
Sx300 enclosures. The Sx300 enclosure is
not designed to suspend multiple enclosures
from itself. If an “array” is required, then
multiple Mb200’s must be used. Arrays may
be constructed vertically by “daisy chaining”
two Mb200s from each other. The Mb300
array bracket allows the easy and secure con-
struction of horizontal arrays, using Mb200’s
to support the enclosure.
Power-Handling Capacity
To our knowledge, Electro-Voice was the
first U.S. manufacturer to develop and pub-
lish a power test closely related to real-life
conditions. First, we use a random-noise in-
put signal because it contains many frequen-
cies simultaneously, just like real voice or
instrument program. Second, our signal con-
tains more energy at extremely high and low
frequencies than typical actual program, add-
ing an extra measure of reliability. Third, the
test signal includes not only the overall
“long-term average” or continuous” level—
which our ears interpret as loudness—but
also short-duration peaks which are many
times higher than the average, just like ac-
tual program. The long-term average level
Sx300 300-Watt Two-Way Compact Speaker System
Sx300 300-Watt Two-Way Compact Speaker System
stresses the speaker thermally (heat). The in-
stantaneous peaks test mechanical reliabil-
ity (cone and diaphragm excursion). Note
that the sine-wave test signals sometimes
used have a much less demanding peak value
relative to their average level. In actual use,
long-term average levels exist from several
seconds on up, but we apply the long-term
average for several hours, adding another
extra measure of reliability.
Specifically, the Sx300 is designed to with-
stand the power test described in the ANSI/
EIA RS-426-A 1980. The EIA test spectrum
is applied for eight hours. To obtain the spec-
trum, the output of a white-noise generator
(white noise is a particular type of random
noise with equal energy per bandwidth in Hz)
is fed to a shaping filter with 6-dB-per-oc-
tave slopes below 40 Hz and above 318 Hz.
When measured with the usual constant-per-
centage bandwidth analyzer (one-third-oc-
tave), this shaping filter produces a spectrum
whose 3-dB-down points are at 100 Hz and
1,200 Hz with a 3-dB-per-octave slope above
1,200 Hz. This shaped signal is sent to the
power amplifier with the continuous power
set at 300 watts into the 5.8-ohm EIA equiva-
lent impedance (41.7 volts true rms). Am-
plifier clipping sets instantaneous peaks
at 6 dB above the continuous power, or
1,200 watts peak (83.4 volts peak). This
procedure provides a rigorous test of both
thermal and mechanical failure modes.
Amplifier Power Recommendations
As noted in the Power-Handling Capac-
ity section above, the Sx300 has a random-
noise power capacity of 300-watts long
term (1,200-watts peak) per ANSI/EIA
RS-426-A 1980. The following guidelines
will help relate this number to an appropri-
ate power amplifier output rating.
1. To use the Sx300 to full capacity, skilled
experts in sound-system installation and
operation will obtain the best results if
the power amplifier is 2.0 to 4.0 times
the long-term average noise power rat-
ing of the speaker system. For the Sx300,
this is 600 to 1,200 watts.
The caution cannot be made strongly
enough, however, that this arrangement
is only for experts or for those who can
discipline themselves against “pushing”
the system for ever-higher sound levels
and who can avoid “accidents” such as
catastrophic feedback or dropped micro-
phones.
2. A more conservative, “normal” ampli-
fier size, which will produce audible re-
sults nearly equal to those of the “ex-
pert” recommendation, is 1.0 to 1.4 times
the long-term average noise power rat-
ing of the speaker. For the Sx300, this
is 300 to 420 watts.
3. To be very conservative, one can use an
amplifier rated at 0.5 to 0.7 times the
long-term average noise power rating of
the loudspeaker. For the Sx300, this is
150 to 210 watts.
Request P.A. Bible Addition No. Two
(Power Handling Capacity) for more
background on these recommendations.
Sx300 Connections
The Sx300 is equipped with two Neutrik
Speakon® NL4MP (Sx300E) or two 1/4-in.
(Sx300P) phone jacks connected in parallel,
a configuration which allows for daisy-
chaining of speaker systems.
In continued high-power applications, Elec-
tro-Voice recommends the use of the Spea-
kon connector. The Speakon NL4MP will
mate to a NL4FC Speakon connector, which
is a 4-pin connector. Figure 6 shows typical
wiring configurations using banana plugs or
1/4-in. phone jacks (the banana plug provides
the more reliable connection). Cable connec-
tions should be made to the 1+ and 1– termi-
nals only. Cables utilizing the Speakon
NL4FC are available from your local dealer
or from the companies listed below:
Pro Co Sound, Inc.
135 E. Kalamazoo Ave.
Kalamazoo, MI 49007
616/388-9675
Whirlwind Music
Distributors, Inc.
P.O. Box 1075
Rochester, NY 14603
716/663-8820
Neutrik USA, Inc.
195-S3 Lehigh Ave.
Lakewood, NJ 08701
908/901-9488
Architects’ and Engineers’
Specifications
The loudspeaker shall consist of a 305-mm
(12-inch) low-frequency transducer in a
vented, trapezoidal-shaped enclosure; a high-
frequency compression driver with a pure
titanium diaphragm coupled to a 65° x 6
constant-directivity horn molded into the
front baffle of the enclosure; and a passive
crossover-equalizer network with protection
for the high-frequency driver. Up to 12 dB
additional bass output can be obtained with
the Electro-Voice Xp200A speaker-system
controller. The loudspeaker shall meet the
following performance criteria: frequency re-
sponse of 80-25,000 Hz, –3 dB; power han-
dling of 300-watts long term and 1,200-watts
short term, with a shaped random-noise in-
put per ANSI/EIA RS-426-A 1980; sensi-
tivity of 100 dB SPL at 1 meter with a 1-watt,
300- to 2,000-Hz pink-noise input; 6-dB-down
horizontal coverage angle of 65° ±15° in the
2,000- to 20,000-Hz range; 6-dB-down ver-
tical coverage angle of 65° ±15° in the
2,000- to 20,000-Hz range; crossover fre-
quency of 1,500 Hz; nominal impedance of
8 ohms and minimum impedance of 5 ohms.
Paralleled input and output connectors shall
be present, consisting of Neutrik Speakon®
NL4MP (Sx300E) or
1/
4-in. (Sx300P) phone
jacks. The enclosure shall be constructed of
polypropylene structural foam and fitted with
a steel grille, an integral handle, a stand
socket for mounting on 1
3/8-inch stands, rub-
ber feet and mating sockets to facilitate stack-
ing. Dimensions shall be 586 mm (23.1 in.)
high x 429 mm (16.9 in.) wide x 312 mm
(12.3 in.) deep. Net weight shall be 17.7 kg
(39 lb).
The loudspeaker system shall be the
Electro-Voice Sx300E, Sx300P,
Sx300WE or Sx300WP.

Especificaciones del producto

Marca: Electro-Voice
Categoría: Vocero
Modelo: Sx300PIX

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