Electro-Voice SX300 Pi Manual de Usario

Electro-Voice Vocero SX300 Pi

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Description

The Sx300PI and Sx300PIX are continua-

tions of the popular the Sx-series offering

the added value of weather-resistant cabi-

nets. The Electro-Voice Sx300PI is a 300-watt,

12-inch, two-way, high-efficiency, constant-

directivity speaker system for permanent in-

stallation. Through the extensive use of

computer-aided design and modeling,

Electro-Voice engineers have developed

a state-of-the-art professional loudspeaker

system for permanent installation where

weather resistance is needed. The

Sx300PIX is the same as the Sx300PI with

the addition of an AT100 transformer.

The high-frequency section of the Sx300PI

utilizes a molded-in, 65° x 65° constant-di-

rectivity horn. This unique pattern contrib-

utes to high intelligibility. Vocals sound

natural, yet “cut through” in reverberant,

noisy rooms. In addition, the coverage pat-

tern is unusually uniform over its range of

operation. Sound quality off axis is very

consistent, 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 cover-

age 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

Sx300PI is the cabinet. Constructed of high-

impact polypropylene structural foam, it pro-

vides a stiff and extremely durable enclosure.

Molded into the cabinet are an integral carry-

ing handle and a stand socket for mounting

on 13/8-inch stands such as the Electro-Voice

100BK. Rubber feet attached to the bottom of

the cabinet and mating sockets molded into

the top provide a means of stacking systems.

The trapezoidal-shaped cabinet in combina-

tion with the uniform, 65° x 65° directivity

characteristics, make the Sx300PI ideal for use

alone or in arrays.

The Sx300PI’s high-frequency horn is driven

by the Electro-Voice 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 extended

high-frequency performance. The voice coil

is coupled to the diaphragm with EV’s exclu-

sive Resonant DriveTM technology. This in-

creases and smooths the high-frequency re-

sponse and reduces the amount of internal

equalization required for flat frequency re-

sponse. Driver output extends to 25,000 Hz.

A self-resetting, high-frequency protection cir-

cuit, EV’s PROTM

circuit, is included with the

Sx300PI

to prevent accidental overdrive and

improve system reliability. If the input power

to the high-frequency driver exceeds the nomi-

nal 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 bass section of the Sx300PI is designed

using Thiele-Small parameters for efficient

performance to below 80 Hz. The woofer is a

DL12Sx 12-inch unit featuring beryllium cop-

per lead wires, a low-mass, edge-wound voice

coil and high-temperature materials. The part

of the magnetic structure adjacent to the coil

is insulated using the exclusive EV PROTEF

process (U.S. Patent #4,547,632). The sys-

tem combines professional-quality compo-

nents, arranged in a time-coherent vertical ar-

ray, with an unusually durable Thiele-Small-

aligned vented enclosure. The result is clear

and articulate, high-quality sound.

Ring-Mode Decoupling (RMD

TM)

The Sx300PI controls both acoustical and

mechanical ring modes to provide dramati-

cally increased intelligibility, using tech-

niques 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.

* Patent pending

00PI

00PIX

300-Watt Two-Way

Weather-Resistant

Speaker Systems

• Ring-Mode Decoupling (RMDTM) for

increased intelligibility

• Lightweight Structural-foam enclosure

• Stand mountable and arrayable

• High efficiency (99 dB, 1 W/1 m)

• High power handling (Sx300PI: 300-watts

continuous, 1,200-watts short term)

• Powder-coated, full-face stainless-steel

grill with foam backing

• Four molded-in attachment points (metric

M8 x 1.25) for secure suspension

• 100-watt transformer option (Sx300PIX)

• Available in white

Sx300PI and Sx300PIX 300-Watt Two-Way Weather-Resistant Speaker Systems

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.

Port Covers

The four ports surrounding the woofer may

be "sealed" in order to add further weather

protection to the system. Optional port cov-

ers may be used in situations where in-

creased weather resistance is needed. This

will aid in the prevention of any moisture

that may protrude through the foam-backed

grill under extreme weather conditions to

accumulate inside the enclosure. The op-

tional port cover "kit" is supplied along with

instructions with each system. However,

once the aid of the port covers are installed,

a difference of frequency response will

change as shown in Figure 2.

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

audience coverage without “hot spots” or

dead zones at certain frequencies. The 65°

dispersion characteristic also helps avoid

early reflections from nearby floor or side-

wall surfaces which could degrade perfor-

mance. 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 acous-

tic power output that is uniform with frequency.

Directivity

A unique feature of the Sx300PI 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

responses were measured in an anechoic en-

vironment 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 4. Rq and directiv-

ity index (Di) are plotted in Figure 5.

Suspending Sx300PI Enclosures

WARNING: Suspending any object is po-

tentially dangerous and should only be at-

tempted by individuals who have a thor-

ough knowledge of the techniques and

regulations of rigging objects overhead.

Electro-Voice strongly recommends that

the Sx300PI be suspended taking into ac-

count all current national, federal, state

and local regulations. It is the responsibil-

ity of the installer to ensure the Sx300PI is

safely installed in accordance with all such

regulations. If the Sx300PI is suspended,

Electro-Voice strongly recommends that

the system be inspected at least once a year.

If any sign of weakness or damage is de-

tected, remedial action should be taken im-

mediately.

When mounting the Sx300PI in a location

where a weather-resistant system is required,

a minimum of a five-degree down angle is

recommended. (See Figure 9.) This will aid

in the prevention of any moisture protrud-

ing through the foam-backed grille. A

manual entitled Suspending System 200TM

Loudspeakers is included with every

Sx300PI system. It gives a summary of the

suspension kits available and an idea of how

each kit is used. A brief overview, which

illustrates some approaches for single and

multiple suspension, is given here for the

benefit 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 Sx300PI enclosure. The four metric

M8 x 1.25 inserts (see Figure 6) which are

built into the enclosure allow the system to

be suspended using eyebolts (Mb100 Ac-

cessory Kit). Typically it will be necessary

to attach two cables to the top eyebolt and

“pull up” on the rear. The Mb200 bracket

(see Figure 8) encompasses the top and bot-

tom of the enclosure and has additional fea-

tures to make suspending the Sx300PI easier

and more flexible. Electro-Voice recom-

mends the use of the Mb200 in all but the

simplest situations. The Mb200 has supple-

mentary holes to allow the Sx300PI to be

attached to a wall or ceiling and aimed at an

audience.

The Mb200 Installation Kit also allows the

use of OmniMount® Series 100 mounting

hardware by providing three-hole-pattern

groups compatible with these support sys-

tems. When OmniMount® Series 100

mounting hardware is specified, the Mb200

Installation Kit must first be attached to the

speaker enclosure.

The second approach is to suspend multiple

Sx300PI enclosures. The Sx300PI enclosure

is not designed to suspend multiple enclo-

sures from itself. If an “array” is required,

then multiple Mb200’s must be used. Ar-

rays may be constructed vertically by “daisy

chaining” two Mb200’s from each other.

The Mb300 array bracket allows the easy

and secure construction 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,

adding 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

stresses the speaker thermally (heat). The

instantaneous 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 ac-

tual use, long-term average levels exist from

several seconds on up, but we apply the

long-term average for several hours, add-

ing another extra measure of reliability.

Specifically, the Sx300PI is designed to

withstand the power test described in the

ANSI/EIA RS-426-A 1980. The EIA test

spectrum is applied for eight hours. To ob-

tain the spectrum, the output of a white-noise

generator (white noise is a particular type

Sx300PI and Sx300PIX 300-Watt Two-Way Weather-Resistant Speaker Systems

of random noise with equal energy per band-

width in Hz) is fed to a shaping filter with

6-dB-per-octave slopes below 40 Hz and

above 318 Hz. When measured with the

usual constant-percentage bandwidth ana-

lyzer (one-third-octave), 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 7.1-ohm EIA equivalent impedance

(46.2 volts true rms). Amplifier clipping sets

instantaneous peaks at 6 dB above the con-

tinuous power, or 1,200-watts peak

(92.5 volts peak). This procedure provides

a rigorous test of both thermal and mechani-

cal failure modes.

Amplifier Power Recommendations

As noted in the Power-Handling Capacity

section above, the Sx300PI has a random-

noise power capacity of 300-watts long term

(1,200-watts peak) (nontransformer) per

ANSI/EIA RS-426-A 1980. The following

guidelines will help relate this number to

an appropriate power amplifier output rat-

ing.

1. To use the Sx300PI to full capacity,

skilled experts in sound system installa-

tion and operation will obtain the best

results if the power amplifier is 2.0 to

4.0 times the long-term average noise-

power rating of the speaker system. For

the Sx300PI this is 600 to 1,200 watts

(nontransformer).

The caution cannot be made strongly

enough, however, that this arrange-

ment is only for experts or for those

who can discipline themselves against

“pushing” the system for ever-higher

sound levels and who can avoid “ac-

cidents” such as catastrophic feedback

or dropped microphones.

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 Sx300PI, this

is 300 to 420 watts (nontransformer).

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 Sx300PI this

is 150 to 210 watts (nontransformer).

Request P.A. Bible Addition No. Two

(“Power Handling Capacity”) for more

background on these recommendations.

Sx300PI Connections

The Sx300PI is equipped with two Neu-

trik Speakon® NL4MP connectors.

In continued high-power applications,

Electro-Voice recommends the use of the

Speakon connector. The Speakon NL4MP

will mate to a NL4FC Speakon connector,

which is a 4-pin connector. Figure 7 shows

typical wiring configurations using banana

plugs. Cable connections for the Sx300PI

should be made to the 1+ and 1– terminals

only. Cable connections for the Sx300PIX

should be made as shown in Figure 9, de-

pending on the given input voltage and the

desired output wattage. 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

It is recommended that after making the

proper connection with the Speakon connec-

tor to the input on the enclosure, a bead of

sealant should be applied around the con-

nection to assure a watertight seal.

Weather-Resistant Mounting

When mounting the Sx300 PI in a location

where a weather-resistant system is required

a minimum of a five-degree down angle is

recommended. (See figure 9.) This will

help prevent any moisture from wicking

through the foam and mesh-backed grille

and accumulating inside the enclosure un-

der extreme weather conditions.

Architects' and Engineers'

Specifications

The loudspeaker shall consist of a 305-mm

(12-inch) low-frequency transducer in a

trapezoidal-shaped enclosure; a high-fre-

quency compression driver with a pure tita-

nium 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. The loud-

speaker shall meet the following perfor-

mance criteria: frequency response of

80 to 25,000 Hz, –3 dB; power handling of

300-watts long term and 1,200-watts short

term (nontransformer), with a shaped ran-

dom-noise input per ANSI/EIA RS-426-A

1980; sensitivity of dB SPL at 1 meter99

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 vertical coverage angle

of 65° ±15° in the 2,000- to 20,000-Hz

range; crossover frequency of 1,500 Hz;

nominal impedance of 8 ohms and minimum

impedance of 6 ohms. Paralleled input and

output connectors shall be present, consist-

ing of Neutrik Speakon® NL4MP connec-

tors. The enclosure shall be constructed of

polypropylene structural foam and fitted

with a full-face, foam-backed, stainless-

steel grille, an integral handle, a stand

socket for mounting on 13/8-inch stands,

rubber feet and mating sockets to facili-

tate stacking. 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)nontransformer; 21.7 kg

(48 lb)transformer. The loudspeaker sys-

tems shall be the Electro-Voice

S x 3 0 0 P I , S x 3 0 0 P I X , S x 3 0 0 P I - W,

Sx300PIX-W.

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, be-

ginning with the date of original purchase.

If such malfunction occurs during the speci-

fied period, the product will be repaired or

replaced (at our option) without charge. The

product will be returned to the customer pre-

paid. Exclusions and Limitations: The

Limited Warranty does not apply to: (a) ex-

terior finish or appearance; (b) certain spe-

cific items described in the individual prod-

uct-line statement(s) below, or in the indi-

Especificaciones del producto

Marca:	Electro-Voice
Categoría:	Vocero
Modelo:	SX300 Pi

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