Sx500PI+400-Watt Two-WayWeather-ResistantSpeaker System• Ring-Mode Decoupling (RMDTM) Technol-

ogy for increased intelligibility• Black powder - coated, full-face stainless

steel grille with foam backing and apolyester mesh water shield.

• Durable structural-foam enclosure withintegral handles, stand mount andmolded-in attachment points for securesuspension with optional brackets

• DL15Sx-W 15-inch woofer and DH2Tcompression driver for great sound andreliable performance

• Asymmetric constant-directivity75° x 60° high-frequency horn

• Asymmetric horn-loaded woofer section• 400-watt long-term rms power capacity• Passive network with biamp capability

Description

The Electro-Voice Sx500PI+ is a weather-resis-tant version of the popular Sx500+ loudspeaker.It is a 400-watt, 15-inch two-way, biampable,high-efficiency, constant-directivity speakersystem featuring a vented-horn woofer section.The weather-resistant features are the speciallytreated woofer, the DL15Sx-W, and the full-facestainless-steel grille backed with both foam anda polyester mesh water shield. Additionally, twoport plugs are included for the customer to in-stall when increased weather resistance isneeded. Through extensive use of computer-aided design and modeling, Electro-Voice en-gineers have developed a state-of-the-art pro-fessional loudspeaker system for permanent in-stallations where weather resistance is needed.

The high-frequency section of the Sx500PI+ uti-lizes a molded-in 75° x 60° constant-directivityhorn which is aimed downward by 10°. Thisunique pattern contributes to high intelligibilityand aims the speaker's output where it is mostuseful. Vocals sound natural yet “cut through”in reverberant, noisy rooms. In addition, the cov-erage pattern is unusually uniform over its rangeof operation. The horn’s unique, VariPathTM

throat geometry helps direct driver output to thecorners of the room, to points of coverage notdescribed in the usual specifications of horizon-tal and vertical coverage angles, and to parts ofthe audience that typically do not receive thestrongest coverage.

One of the many other unique features of theSx500PI+ is the cabinet. Constructed of high-impact polypropylene structural foam, it pro-vides a stiff and extremely durable enclosure.The cabinet includes integral carrying handlesand a stand socket for mounting on 13/

8-inch

stands such as the Electro-Voice 100BK. Rubberfeet that are attached to the bottom of the cabinetand mating sockets that are molded into the topprovide a means of stacking systems. The shapedplastic cabinet, in combination with the uniform,75° x 60° directivity characteristics, make theSx500PI+ ideal for use alone or in arrays.

The Sx500PI+’s high-frequency horn is drivenby the DH2T one-inch throat, wide-bandwidth,titanium-diaphragm driver. This driver uses aunique, convex-drive Time Path™ phasing plugstructure (U.S. Patent #4,525,604) for smoothand extended high-frequency performance. Thevoice coil is coupled to the diaphragm with EV’sexclusive Resonant Drive™ Technology. Thisincreases and smooths the high-frequency re-sponse and reduces the amount of internal equal-ization required for flat frequency response,which extends to 20,000 Hz.

A self-resetting high-frequency protection cir-cuit, EV’s PRO™ circuit, is included with theSx500PI+ to prevent against accidental over-drive and improve system reliability. If the in-put power to the high-frequency driver exceedsthe nominal rating, the protection circuit is acti-vated and reduces the power delivered to thedriver by 6 dB. The system will remain in this

mode of operation until the input power is re-duced to a safe level.

The bass section of the Sx500+ is a vented-horndesign using Thiele-Small parameters for solidperformance to 45 Hz. This horn provides di-rectivity control for the woofer section andmatches the asymmetry of the high-frequencysection. The 381-mm (15-in.) DL15Sx-Wweather-resistant woofer used is a specially de-signed unit featuring an extended-length voicecoil and high-temperature construction materi-als. The system combines professional-qualitycomponents, arranged in an unusually durableThiele-Small-aligned vented enclosure. The re-sult is clear and articulate, high-quality sound.

Ring-Mode Decoupling (RMDTM )Technology

The Sx500PI+ controls both acoustical and me-chanical ring modes to provide dramatically in-creased intelligibility, using techniques learnedfrom the development of the Electro-VoiceX-Array™ concert speakers. There is much lesscoloration of the sound from resonatingsources, leaving only the intended sound to beheard by the audience. The most obvious imple-mentation of RMD™ in the Sx500PI+ is thefoam attached to the back of the woofer grille.

Speaker Protection

The Sx500PI+ like all other vented systems ex-periences rapidly increasing cone excursion

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below the box-tuning frequency, while theacoustic output decreases rapidly. To ensure along woofer life even when used at high powerlevels, it is recommended that some form ofelectronics be used to control unnecessarywoofer cone excursion.

Graphic equalizers and active crossovers aretwo methods that can be used to prevent low-frequency signal below band-pass from goingto the loudspeaker. When using an active cross-over, a high-pass filter with a cutoff frequencyof 32- to 45-Hz will provide the necessary pro-tection. The filter should have a slope of at least12 dB per octave. Such subpass band filtersare found in many crossovers and equalizersmanufactured by Electro-Voice, as well as othercommercially available equipment.

Enclosure Construction

The Sx500PI+ enclosure is contructed of verydurable structural foam that is hard to dent,scratch or break. The structural foam enclosureallows for the high- and low-frequency horns,the stand mount and the suspension points tobe molded into the enclosure. It also allows forthree handles to be integrated into the enclo-sure.

Frequency Response

The combination of a 15-inch woofer, wide-bandwith high-frequency driver and an equal-ized crossover results in the wide and smoothoverall response shown in Figures 1a and 1b.Figure 1a is the response with the ports openwhile Figure 1b is the response with the twooptional port plugs installed. This response wasmeasured at 3.05 meters (10 feet), using a 4-volt swept sine-wave input in an anechoicchamber using the internal passive crossover.No external equalization was used. Figures 1aand 1b have been averaged and corrected for 1watt at 1 meter.

Port Plugs

The two ports, on either side of the high-fre-quency horn, may be "sealed" in order to addfurther weather protection to the system. Theseoptional foam port plugs are included with thesystem for use in situations where increasedweather resistance is needed. This will helpprevent any moisture from wicking through thefoam-backed grille and accumulating inside theenclosure under extreme weather condidtions.The optional port plugs and instructions aresupplied with each system. It should be noted,however, that once the port plugs are installed,

the frequency response will change to thatshown in Figure 1b.

Connections and Biamping

The Sx500PI+ is equipped with two parallelNeutrik Speakon® NL4MP connectors. In thefull-range mode, as supplied by the factory, pins1+ and 1– are the inputs to the system.

Another system can be connected in parallelby using the other connector. Care must betaken not to abuse the amplifier by connectingimpedances which are too low.

The user may put the system in biamp modeby removing the input panel and moving a con-nector from the full-range mode to biamp mode,as noted on the crossover. In biamp mode, 1+,1– are the LF inputs and 2+, 2– are the HFinputs.

Constant-Directivity Speaker System

The crossover frequency and speaker- compo-nent geometries have been selected so that thedirectional characteristics of the woofer andconstant-directivity high-frequency horn matchat the crossover frequency to create a specialsystem type — the constant-directivity system.At higher frequencies, the horizontal coveragepattern remains constant and the vertical pat-tern smoothly transitions to a 60° angle above5,000 Hz. Response within the 75° x 60° ratedcoverage angle is uniform, which means de-pendable audience coverage without “hotspots” or dead zones at certain frequencies. The75° x 60° dispersion characteristic also helpsavoid early reflections from nearby floor orside-wall surfaces which could degrade perfor-mance. The controlled directivity of the high-and low-frequency transducers also eliminatesresponse irregularities caused by diffraction offnearby enclosure edges and, in combinationwith an essentially flat on-axis frequency re-sponse, produces a total acoustic power outputthat is uniform with frequency.

Directivity

A unique feature of the Sx500PI+ is the con-stant-directivity dispersion provided by the 75°x 60° horn. The polar response of the systemat selected one-third-octave bandwidths isshown in Figure 2. These polar responses weremeasured in an anechoic environment at 6.1meters (20 feet) using one-third-octave pink-noise inputs. The frequencies selected are fullyrepresentative of the polar response of the sys-tem. Beamwidth of the system utilizing thecomplete one-third-octave polar data is shown

in Figure 3. Directivity factor, R , and directiv-

ity index, Di, are plotted in Figure 4.

Power-Handling Capacity

The Sx500PI+ is shipped in full-range modeusing an internal crossover. In biamp mode, thelong-term average power-handling capacity isas follows:

Low Frequency: 400 watts

High Frequency: 60 watts

Electro-Voice components and systems aremanufactured to exacting standards, ensuringthey will hold up, not only through the mostrigorous of power tests, but also through con-tinued use in arduous, real-life conditions. TheEIA Loudspeaker Power Rating Full Range(ANSI/EIA RS-426-A 1980) uses a noise spec-trum which mimics typical music and tests thethermal and mechanical capabilities of the com-ponents. Electro-Voice will support relevant ad-ditional standards as and when they becomeavailable. Extreme, in-house power tests, whichpush the performance boundaries of the woof-ers, are also performed and passed to ensureyears of trouble-free service.

Specifically, the Sx500PI+ passes ANSI/EIARS-426-A 1980 with the following values:

R = 5.76 ohms (1.15 x (RE + 1.86))

RE = woofer DCR

1.86 =horn-load impedance correction

PE(MAX)

= 400 watts

Test voltage = 48.00 volts rms,

96.00 volts peak (+6 dB)

The “peak” power-handling capacity of awoofer is determined by the peak test-voltageamount. For the Sx500PI+, a 96.00-volt peaktest-voltage translates into 1,600-watts short-term peak power-handling capacity. This is theequivalent of four times the “average” power-handling capacity, and is a peak that can besustained for only a few milliseconds. How-ever, this sort of short duration peak is verytypical in speech and music. Provided the am-plifier can reproduce the signal accurately with-out clipping, the woofer will also perform ac-curately and reliably, even at these levels.

Amplifier Power Recommendations

As noted in the Power-Handling Capacity sectionabove, the Sx500PI+ has a random-noise power ca-pacity of 400-watts long term (1,600- watts peak)per ANSI/EIA RS-426-A 1980. The followingguidelines will help relate this to an appropriatepower amplifier output rating.

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1. To use the Sx500PI+ to full capacity, skilledexperts in sound-system installation and op-eration will obtain the best results if thepower amplifier is 2.0 to 4.0 times the long-term average noise- power rating of thespeaker system. For the Sx500PI+, this is800 to 1,600 watts.

The caution cannot be made stronglyenough, however, that this arrangement isonly for experts or those who can disciplinethemselves against “pushing” the system forever-higher sound levels and who can avoid“accidents” such as catastrophic feedbackor dropped microphones.

2. A more conservative, “normal” amplifiersize, which will produce audible resultsnearly equal to those of the “expert” rec-ommendation, is 1.0 to 1.4 times the long-term average noise-power rating of thespeaker. For the Sx500PI+, this is 400 to640 watts.

3. To be very conservative, one can use anamplifier rated at 0.5 to 0.7 times the long-term average noise-power rating of thespeaker. For the Sx500PI+, this is 200 to280 watts.

Request P.A. Bible Addition No. Two (“PowerHandling Capacity”) for more background onthese recommendations.

Service

In the unlikely event the Sx500PI+ requires ser-vice, the woofer can be removed from the front.The high-frequency driver can be removedfrom the rear by first removing the input panel.A service data sheet is available from Electro-Voice.

Stand Mounting

When used on a stand, the stand must be placedon a stable surface. The stand must be rated tosupport systems of 38.6 kg (85 lb) or greater.It must have a base diameter of 1.22 m (4 ft) orgreater. The bottom of the speaker should beno higher than 1.52 m (5 ft) from the bottom ofthe stand. The user must be sure that safe useon a stand is not affected by wind or any otherconditions.

The Sx500PI+ can be mounted on the 100BKspeaker stand or any other stand with a1 3/8-inch diameter shaft.

Suspending Sx500PI+ Enclosures

WARNING: Suspending any object is

potentially dangerous and should beattempted only by individuals who have athorough knowledge of the techniques andregulations of rigging objects overhead.Electro-Voice strongly recommends that theSx500PI+ be suspended taking into accountall current national, federal, state and localregulations. It is the responsi-bility of theinstaller to ensure the Sx500PI+ is safelyinstalled in accordance with all suchregulations. If the Sx500PI+ is suspended,Electro-Voice strongly recommends that thesystem be inspected at least once a year. Ifany sign of weakness or damage is detected,remedial action should be takenimmediately.

The Sx500PI+ enclosure contains eightM8 x 1.25 inserts (see Figure 7) which are builtinto the enclosure for the purpose of suspen-sion. Before the enclosure is suspended, theseinserts are used to attach plates that hold thetwo halves of the enclosure together in addi-tion to providing a way to suspend the enclo-sure.

The suspension kits that are available for theSx500PI+ are listed below. Please refer to in-dividual suspension-kit engineering data sheetsfor full details and safety information.

The first approach is to suspend individualSx500PI+ enclosures. The Mb700 forged eye-bolt attachment kit (see Figure 9) is an eyeboltsuspension kit. It includes a top and bottommounting plate to secure the two halves of theenclosure, in addition to the necessary hard-ware. Typically it will be necessary to attachtwo cables to the top eyebolts and to “pull-up”on the bottom plate. The Mb500 wall/ceilingmounting bracket (see Figure 8) encompassesthe top and bottom of the enclosure with abracket attached to the two plates to secure thehalves of the enclosure. Additionally, it has fea-tures to make suspending the Sx500PI+ easierand more flexible. Electro-Voice recommendsthe use of the Mb500 in all but the simplestsituations. The Mb500 has supplementary holesto allow the Sx500PI+ to be attached to a wallor ceiling and aimed at an audience.

The second approach is to suspend multipleSx500PI+ enclosures. The Sx500PI+ enclosureis not designed to suspend multiple enclosuresfrom itself. If an “array” is required, then mul-tiple Mb500’s must be used. Arrays may beconstructed vertically by “daisy chaining” twoMb500’s from each other. The Mb600 horizon-tal array kit allows the easy and secure con-struction of horizontal arrays, using Mb500’s

to support the enclosure.

Weather-Resistant Mounting

When mounting the Sx500PI+ in a locationwhere a weather-resistant system is required,a minimum of a five-degree down angle is rec-ommended. (See Figure 10.) This will helpprevent any moisture from wicking through thefoam and mesh-backed grille and accumulat-ing inside the enclosure under extreme weatherconditions.

Architects’ and Engineers’ Specifications

The loudspeaker shall be a compact vented-box type. The low frequencies shall be repro-duced with one horn-loaded DL15Sx-W381-mm (15-in.) woofer. The high frequenciesshall be reproduced by a DH2T, high-frequencycompression driver with a pure-titanium dia-phragm, coupled to a 75° x 60° constant-direc-tivity horn molded into the front baffle of theenclosure. The system will use a passive cross-over-equalizer network with protection for thehigh-frequency driver. The loudspeaker shallmeet the following performance criteria: fre-quency response of 66-16,000 Hz, –3 dB;power handling of 400-watts long term and1,600-watts short term, with a shaped random-noise input per ANSI/EIA RS-426-A 1980;sensitivity of 100-dB SPL at 1 meter with a 1-watt, 300-2,000-Hz pink-noise input; 6dB-down horizontal coverage angle of 75° + 14°/– 20° in the 2,000- to 16,000-Hz range; 6-dB-down vertical coverage angle of 60° +11°/– 8° in the 2,000- to 16,000-Hz range; cross-over frequency of 1,600 Hz; nominal imped-ance of 8 ohms and minimum impedance of5.2 ohms in full-range mode. Paralleled inputand output connectors shall be present, con-sisting of Neutrik Speakon® NL4MP connec-tors. The enclosure shall be constructed ofpolypropylene structural foam and fitted witha powder-coated full-face stainless-steel grillewith foam backing and a polyester mesh watershield, three integral handles, a stand socketfor mounting on 1 3/8 -inch stands, rubber feetand mating sockets to facilitate stacking. Di-mensions shall be 838 mm (33 in.) high x 673mm (26.5 in.) wide x 448 mm (17.63 in.) deep.Net weight shall be 32.9 kg (72.5 lb).

The system shall be capable of producing av-erage sound levels in excess of 126 dB in thelong term, and short-term peaks of 132 dB.

The loudspeaker system shall be theElectro-Voice Sx500PI+.

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Uniform Limited Warranty

Electro-Voice products are guaranteed againstmalfunction due to defects in materials orworkmanship for a specified period, as notedin the individual product-line statement(s) be-low, or in the individual product data sheet orowner’s manual, beginning with the date oforiginal purchase. If such malfunction occursduring the specified period, the product willbe repaired or replaced (at our option) withoutcharge. The product will be returned to the cus-tomer prepaid. Exclusions and Limitations:The Limited Warranty does not apply to: (a)exterior finish or appearance; (b) certain spe-cific items described in the individual prod-uct-line statement(s) below, or in the individualproduct data sheet or owner’s manual; (c) mal-function resulting from use or operation of theproduct other than as specified in the productdata sheet or owner’s manual; (d) malfunctionresulting from misuse or abuse of the product;or (e) malfunction occurring at any time afterrepairs have been made to the product by any-one other than Electro-Voice Service or anyof its authorized service representatives.

Obtaining Warranty Service: To obtain war-ranty service, a customer must deliver the prod-uct, prepaid, to Electro-Voice Service or anyof its authorized service representatives to-gether with proof of purchase of the product inthe form of a bill of sale or receipted invoice.A list of authorized service representatives isavailable from Electro-Voice Service at600 Cecil Street, Buchanan, MI 49107(800/234-6831 or FAX 616/695-4743). Inci-dental and Consequential Damages Ex-cluded: Product repair or replacement and re-turn to the customer are the only remedies pro-vided to the customer. Electro-Voice shall notbe liable for any incidental or consequentialdamages including, without limitation, injuryto persons or property or loss of use. Somestates do not allow the exclusion or limitationof incidental or consequential damages so theabove limitation or exclusion may not apply toyou. Other Rights: This warranty gives youspecific legal rights, and you may also haveother rights which vary from state to state.

Electro-Voice Speakers and Speaker Sys-tems are guaranteed against malfunction dueto defects in materials or workmanship for a

period of five (5) years from the date of origi-nal purchase. The Limited Warranty does notapply to burned voice coils or malfunctionssuch as cone and/or coil damage resulting fromimproperly designed enclosures. Electro-Voiceactive electronics associated with the speakersystems are guaranteed for three (3) years fromthe date of original purchase. Additional de-tails are included in the Uniform Limited War-ranty statement.

For warranty repair, service information, or alisting of the repair facilities nearest you, con-tact the service repair department at:616/695-6831 or 800/685-2606.

For technical assistance, contact TechnicalSupport at 800/234-6831 or 616/695-6831,M-F, 8:00 a.m. to 5:00 p.m. Eastern Standardtime.

Specifications subject to change without notice.

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Figure 1a—SX500PI+ Axial FrequencyResponse, (anechoic environment, 4volts/3.05 meters (10 feet), normalized to1 watt/1 meter) (open ports)

Figure 1b—Sx500PI+ Axial FrequencyResponse, (anechoic environment, 4volts/3.05 meters (10 feet), normalized to1 watt/1 meter) (closed ports)

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Figure 4 — Sx500PI+ Directivity vs.Frequency (anechoic environment)

Figure 5 — Sx500PI+ HarmonicDistortion Response 10% Rated PowerInput (40 watts), (anechoic environment,3.05 meters (10 feet), on axis)

Figure 3 — Sx500PI+ Beamwidth vs.Frequency (anechoic environment)

Second HarmonicThird Harmonic

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Figure 6b — Sx500PI+ Full-RangeImpedance Curve (closed ports)

Figure 6a — Sx500PI+ Full-RangeImpedance Curve (open ports)

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Figure 7 — Sx500PI+ Dimension LineDrawing

202 mm(8.0 in.)

METRIC (M8 X 1.25) METAL INSERTSFOR SUSPENDING ENCLOSURESWITH KITS (EIGHT PLACES)

838 mm(33.0 in.)

448 mm(17.6 in.)

673 mm(26.5 in.)

202 mm(8.0 in.)

101 mm(4.0 in.)

101 mm(4.0 in.)

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Figure 8 — Sx500PI+ enclosure withMb500 kit

Figure 9 — Sx500PI+ enclosure withMb700 kit

Figure 10 — Sx500PI+ Recommendedmounting angle

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Specifications

Typical Axial Frequency Response,Swept Sine Wave, 4 volts at 3.05meters (10 feet), (anechoic environ-ment, normalized for 1 watt at 1meter; see Figure 1a and 1b):

66-16,000 Hz (open port)73-16,000 Hz (closed port)

Low-Frequency (3-dB-Down Point):66 Hz (open port)73 Hz (closed port)

Usable Low-Frequency Limit (10-dB-down point):

45 Hz (open and closed port)Half Space Reference Efficiency:

4.4%Long-Term Average Power-HandlingCapacity per EIA Standard RS-426-A1980 (see Power-Handling Capacitysection):

400 wattsMaximum Woofer Acoustic Output:

17.6 wattsSensitivity (SPL at 1 watt, 1 meterinput, anechoic environment, sweptsine wave):

100 dBNominal Coverage Angle,

Horizontal: 75°Vertical: 60°

Dispersion Angle Included by 6-dB-Down Points on Polar Responses,Indicated One-Third-Octave Bands ofPink Noise (see Figure 3),2,000-20,000 Hz, Horizontal:

75° (+14°, –20°)2,000-20,000 Hz, Vertical:

60° (+11°, –8°)Directivity Factor R θ (Q), 800- to16,000-Hz Median (see Figure 4):

11.8 (+0.8, –2.6)Directivity Index D

i, 800- to 16,000-Hz

Median (see Figure 4):15.2 dB (+3.0 dB, –6.9 dB)

Distortion, 0.1 Full Power Input (seeFigure 5), Second Harmonic,

100 Hz:–33 dB, 2.2%

1,000 Hz:–48 dB, .4%

10,000 Hz:–22 dB, 8.4%

Third Harmonic,100 Hz:

–41 dB, .9%1,000 Hz:

–60 dB, .1%10,000 Hz:

–41 dB, .9%Transducer Complement,

Low Frequency:DL15Sx-W weather-resistantwoofer

High Frequency:DH2010A driver

Box Tuning Frequency:44 Hz (open port)

Crossover specifications, Full-rangemode,

Crossover Frequency:1,600 Hz

Crossover Slope,Low Pass:

18 dB per octaveHigh Pass:

12 dB per octaveBiamp Mode,

Recommended Crossover Fre-quency:

1,600 HzCrossover Slopes,

Recommended:24 dB per octave

Minimum:18 dB per octave

Impedance, Full-Range Mode,Nominal:

8 ohmsMinimum:

5.2 ohmsBiamp Mode,Nominal (low frequency/highfrequency):

8 ohms/8 ohmsMinimum (low frequency/highfrequency):

4.9 ohms/7.9 ohmsInput Connections,Two parallel Neutrik Speakon® NL4MPconnectors with the following pinarrangements,

Full-Range Mode:1– = IN (–)1+ = IN (+)2– = Not Used2+ = Not Used

Biamp Mode:1– = LF (–)1+ = LF (+)2– = HF (–)2+ = HF (+)

Driver Protection, High Frequency:Solid-state self-resetting circuit(PRO™ circuit) drops output 6 dB;blocking capacitor with 800-Hz cornerfrequency and 6-dB-per-octave slope

Enclosure Materials and Colors:Polypropylene structural foam; blackBlack powder-coated stainless-steelperforated metal grille with foambacking and a polyester water shield

Dimensions (see Figure 7),Height:

838 mm (33.0 in.)Width:

673 mm (26.5 in.)Depth:

448 mm (17.63 in.)Net Weight:

32.9 kg (72.5 lb)Shipping Weight:

37.0 kg (81.5 lb)Included Accessory:

Foam port plugs for increased water-resistance

Optional Accessories:100BK mounting standMb500 installation kitMb600 horizontal array kitMb700 eyebolt attachment kitVPC500 protective coverPD500 padded protective case

Attachment Points:Eight metric inserts (M8 x 1.25) (seeFigure 7 and Suspending Sx500Enclosures section)

Sx50

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Sx500PI+ 400-Watt Two-Way Weather-Resistant Speaker System

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SPEAKERS – Two-Way Weather-Resistant Part Number 535466-9918

600 Cecil Street, Buchanan, MI 49107616/695-6831, 616/695-1304 Fax

© Telex Communications, Inc., 1999 • Litho in U.S.A.