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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 user’s 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

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 Mb200’s 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

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 65°

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

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.

Produktspecifikationer

Varumärke:	Electro-Voice
Kategori:	högtalare
Modell:	Sx300PIX

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