Electro-Voice PIM-251 User's Manual
Contents
1. 555573465 521595558 Sip ROOTES ERE ERROR eode a RN EOE E A STE regne pt pH EPOR o Mer Uno Ma Su PHOT enna SPECIFICATIONS Versions Available See PIM 251 ordering matrix Figure 1 Typical Axial Frequency Response swept sine wave input anechoic environment 4 volts at 1 kHz at 10 feet see Figure 2 55 1 800 Hz Low Frequency 3 dB Down Point Normal 55 Hz Step Down with equalization 39 Hz Usable Low Frequency Limit 10 dB down point Normal 45 Hz Step Down with equalization 32 Hz Recommended Crossover Frequency 80 200 Hz Crossover Slopes Recommended 24 dB per octave Minimum 12 dB per octave Long Term Average Power Handling Capacity per EIA RS 426 A 1980 see Power Handling Test section 1 200 watts Sensitivity far field SPL referred to 1 meter 1 watt input anechoic environ ment band limited pink noise 100 800 Hz 101 dB SPL at Full Power far field SPL at 1 watt 1 meter referred to full power anechoic environment band limited pink noise 100 800 Hz Long Term Average Peak 132 dB 138 dB Impedance drivers in parallel Nominal 4 ohms Minimum 4 5 ohms Half Space Reference Efficiency 8 6 Beamwidth angle included by 6 dB down points on polar responses indicated one third octave bands of pink noise see Figure 3 50 to 125 Hz Horizontal 360 400 to 800 Hz Vertical 117 15 Directivity Fa2. tween the cones The highest frequency at which mutual coupling occurs is calculated from the following equation 3 000 Dax where D is the distance in inches and f is the frequency in Hz When Dax is greater than one quarter wavelength as would occur if two PIM 251 s were widely spaced the level in crease tends to be limited to the 3 dB power handling increase ARCHITECTS AND ENGINEERS SPECIFICATIONS The loudspeaker shall be an optimally vented low frequency system Low frequencies shall be reproduced by dual 4 ohm 381 mm 15 in woofers each with an edge wound flat wire 102 mm 4 in voice coil capable of handling 600 watts long term per EIA RS 426 A and with an overall system sensitivity of 101 dB 1 1 meter The system shall reproduce frequen cies from 55 to 1 800 Hz The recommended crossover frequency shall be 80 to 200 Hz Maximum average sound pressure levels at 1 meter shall be 132 dB with short term peaks 6 dB higher The enclosure shall be constructed of 7 ply void free birch and finished in black textured paint The enclosure shall have a trapezoidal footprint Dimensions shall be 1 01 m 39 9 in high 575 mm 22 6 in wide at the front 359 mm 14 1 in wide at the rear and 439 mm 17 8 in deep Enclosure sides shall have a 15 draft angle The enclosure shall have a suspension system approved by an indepen dent structural engineer and consisting of three independent suspension poin
3. seer VERTICAL Tus BEAMWIOTH IN DEGREES FIGURE 4 PIM 251 Directivity Factor and Directivity Index vs Frequency one third octave bands of pink noise 30 T I T mh DA P Eu ri rii Sena FREQUENCY IN HERTZ one third octave bands of pink noise c S 10 FIGURE 7 PIM 251 Polar Responses Selected to Typify Performance amp DIRECTIVITY INDEX 0 dB FIGURE 5 PIM 251 Harmonic Distortion 10 Rated Input Power at 100 Hz on axis at 1 meter from system E E ELLE E T TEN Wipe M Ae eX TTT SEW LSS COA BUTT WUT RET vee REET P SS uu 21 111 E i TE C wT T ERN D ZAR amp EN TS ARES ARE Y Te RRES DAL CAE QA REY ofl Haw wm Ie 5 dB PER DIVISION HORIZONTAL LONG ENCLOSURE AXIS VERTICAL VERTICAL Distortion Response 10 Rated Input Power at 100 Hz on axis at 1 meter from system see Figure 5 Second Harmonic 50 Hz 2 0 80 Hz 2 5 200 Hz lt 1 0 Third Harmonic 50 Hz 1 1 80 Hz lt 1 0 200 Hz lt 1 0 Transducer Complement Low Frequency Two EVX150A 381 mm 15 in woofers in a vented enclosure Box Tuning Frequency Normal 50 Hz Step Down 35 Hz Polarity A positive vol
4. unfinished 14 ply birch C textured bik paint 7 ply birch D textured bik paint 14 ply birch E Wolverine ureth 7 ply birch F Wolverine ureth 14 ply birch G white primer 7 ply birch white primer 14 ply birch NOTE Ex tion Misc 2 X none Misc 1 X nona handies Crossover X none Rigging X none Grille metal w foam Input Panel N A N A Speakor passive barrier strip passive 4 C Ay SANA AAA gt gt gt gt M os oo We 4 H gt ae x OU LEN ee d 4L m RR UR t n AUS UR a e A AL 9 3380 3330132 ae SRE TEREST RS RN ances Sapere et Sree CREPE EH EMER Meee See Se ape meet bu eM mee AMI NIME S nm ae SCORES COPPER EN PIM 251 SPECIFICATION GRAPHICS FIGURE 2 PIM 251 Typical Axial Frequency Response swept sine wave FIGURE 6 PIM 251 Dimensions input anecholc environment 4 volts at 10 feet normalized for 1 watt at 1 meter TUTTE TT ELE T TNA T E EHE 5 90 g o 80 FREQUENCY IN HERTZ FIGURE 3 PIM 251 Beamwidth vs Frequency one third octave bands of pink noise EREL A Lm BENI T E TUI
5. a break strength of 907 kg 2 000 Ib in any direction A maximum of two enclosures can be daisy chained to gether allowing the construction of vertical arrays This also applies to other PIM models with the same footprint as long as the lower system is no heavier than the upper system If the lower system is heavier or if longer arrays are required provision must be made to inde pendently suspend each enclosure The Ancra 42546 10 fitting incorporates a safety pin to prevent accidental release and it should be engaged at all times CONNECTIONS ing on the option ordered barrier strip or Neutrik Speakon connectors are used for input connections Each low frequency driver is wired individually to each barrier strip con nector and both can be paralleled via the jumper bar provided In the Speakon connec tor option pins 1 1 are wired to one driver and 2 2 to the other If parallel connections are desired this must be done at the amplifier terminals In all cases drivers are connected with the same polarity A positive voltage ap plied to the positively marked terminal pro duces a positive acoustic pressure at the front of the system FREQUENCY RESPONSE PIM 251 axial frequency response was mea sured in Electro Voice s large anechoic cham ber at a distance of 3 0 meters 10 feet with swept sine wave input Figure 2 shows the typical system response with a 4 volt drive normalized for a 1 watt input and a 1
6. active electronics associated with the speaker systems are guaranteed for three 3 years from the date of original purchase Additional details are included in the Uniform Limited Warranty statement Electro Voice Flying Hardware including enclosure mounted hardware and rigging ac cessories is guaranteed against malfunction due to defects in materials or workmanship for a period of one 1 year from the date of original purchase Additional details are in cluded in the Uniform Limited Warranty state ment Electro Voice Accessories are guaranteed against malfunction due to defects in materials or workmanship for a period of one 1 year from the date of original purchase Additional details are included in the Uniform Limited Warranty statement Service and repair address for this product Electro Voice Inc 600 Cecil Street Buchanan Michigan 49107 616 695 6831 or 800 234 6831 Specifications subject to change without no tice ELST 00 Cecil Street Buchanan Michigan 49107 Part Number 532706 9532 Se SSS Sea hs Sena RSS OR qe ne an ae Te
7. product by anyone other than Electro Voice or any of its authorized service representatives Obtaining Warranty Service To obtain war ranty service a customer must deliver the product prepaid to Electro Voice or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice A list of authorized service representatives is avail able from Electro Voice at 600 Cecil Street Buchanan MI 49107 616 695 6831 or 800 234 6831 Incidental and Consequential Damages Excluded Product repair or re placement and return to the customer are the only remedies provided to the customer Electro Voice shall not be liable for any inci dental or consequential damages including without limitation injury to persons or property or loss of use Some states do not allow the exclusion or limitation of incidental or conse quential damages so the above limitation or exclusion may not apply to you Other Rights This warranty gives you specific legal rights and you may also have other rights which vary from state to state Electro Voice Speakers and ma gin Sys tems are guaranteed against malfunction due to defects in materials or workmanship for a period of five 5 years from the date of original purchase The Limited Warranty does not ap ply to burned voice coils or malfunctions such as cone and or coil damage resulting from improperly designed enclosures Electro Voice
8. ctor R Q Median over Indicated Range see Figure 4 50 125 Hz 1 0 400 800 Hz 10 8 SESE A NEIN SR a Ia FIGURE 1 PIM 251 Ordering Matrix m gt Issac e me LE irit a E x tie t vs ho m as Sore 2213 S D 42 AUS QU bie cre Ef eh penn Sea O OM e v a standard configuration Dual 15 Inch Vented Low Frequency System for Permanent Installation Part of Pi Matrix Series compact trapezoidal systems e Components and physical characteristics optional to meet many acoustic architectural and mechanical requirements e Extends response to 55 Hz 39 Hz in step down mode e Integral suspension system for safe and easy installation ahr bo por Olog R Directivity Index D 1 50 125 Hz 0 0 dB 400 800 Hz 10 3 dB Distortion Response 1 Rated Input Power at 100 Hz on axis at 1 meter from system Second Harmonic 50 Hz 1 096 80 Hz 1 09 200 Hz 1 095 Third Harmonic 50 Hz 1 096 80 Hz 1 096 200 Hz lt 1 0 UOTE HEU E ample is the standard system configura Options for PIM 251 281 z Dual 15 inch LF system Woofers A DL15X BzDL15X 16 C z D EVX 150A HF Drivers X enciosure painted black barrier strip mata grille fying hardware for Ancra 42546 10 s and no misc items Enclosure Finish Materials A unfinished 7 ply birch B
9. he AES Recommended Practice for Specification of Loudspeaker Components Used in Professional Audio and Sound Reinforcement AES2 1984 ANSI 54 26 1984 and the EIA Loudspeaker Power Rating Full Range EIA RS 426 A 1980 Both of these specifications use random noise spectrum which mimics typical music and tests the thermal and mechanical capabilities of the components Electro Voice will supportrelevant additional standards as and when they become available Extreme in house power tests which push the performance boundaries of the com ponents are also performed and passed to ensure years of trouble free service The PIM 251 passes EIA RS 426 A 1980 with the following values woofers in parallel Rsa 2 9 ohms 1 15 x R 1 200 watts Test voltage 59 0 volts rms 118 volts peak 6 dB STEP DOWN Step down is a method of extending the low frequency response by increasing power input to the system instead of the enclosure volume In step down mode the enclosure is tuned to 0 707 the normal frequency This increases the output at the new tuning fre quency and reduces the output at the original 1 For additional information contact Ancra International at 606 37 1 7272 or toll free within U S only at 800 233 5138 226 we Fe tuning eem This smoothly falling ampli tude response can be equalized to obtain a new 3 aB down point in the region of 0 7 that of the original To obtain a similar response withou
10. hitectural and mechanical require ments PIM 251 options include low frequency driv ers enclosure materials and finish grilles suspension hardware and input panel con nections giving the sound contractor or con sultant literally thousands of combinations to satisfy the overall system design criteria The PIM 251 standard configuration employs dual EVX 150A 381 mm 15 inch long throw extended reliability woofers Operating between 55 and 1 800 Hz in a compact enclosure the EVX 150A can handle very high levels of input power producing high acoustic output with relatively low distortion The PIM 251 is equipped with a number of additional features to make operation and in stallation easy and secure A proprietary struc tural extrusion is incorporated into the enclo sure providing safe and flexible suspension see Suspending PIM 251 Enclosures section Up to two enclosures of the same footprint can be suspended without additional support as long as the lower system is not heavier than the upper system so arrays can be created quickly and easily The grille is composed of vibration resistant steel for excellent driver protection and an optional foam cover can be added for better protection when used outdoors Besides the standard black painted finish the enclo sure can also be ordered primed in white for painting with ordinary paints unfinished for staining or with our special Wolverine weather resistant finish for
11. meter distance DIRECTIVITY The directional characteristics of the PIM 251 were measured in Electro Voice s large anechoic chamber with a test signal of one third octave filtered pink noise at the frequen cies indicated A full spherical measurement system which is fully compatible with Mark IV Audio s AcoustaCADD computer aided de sign program was used All directional infor mation was measured at 6 1 meters 20 feet Figure 7 illustrates the nominal horizontal and vertical polar responses with the long system axis vertical Figure 3 illustrates the horizontal and vertical beamwidths Beamwidth is the angle at which the horizontal and vertical polar responses have decreased in level by 6 dB when com pared to the on axis frequency response Figure 4 represents the total directivity of the PIM 251 The directivity factor R is the relative value at a point when compared to an ideal spherical response The directivity index D is calculated by 0 10log R SERVICE in the unlikely event the PIM 251 requires ser vice the drivers can be replaced or serviced from front A service data sheet is available from Electro Voice POWER HANDLING TEST Electro Voice components and systems are manufactured to exacting standards ensuring they will hold up not only through the most rigorous of power tests but also through contin ued use in arduous real life conditions Two main test specifications are used t
12. outdoor applications The PIM 251 drivers can be serviced from the front of the enclosure complete listing of all system options is shown in Figure 1 SUSPENDING PIM 251 ENCLOSURES Suspending any object is potentially danger ous and should be attempted only by individu als who have a thorough knowledge of the techniques and regulations of hanging over head Electro Voice strongly recommends that the PIM 251 be suspended taking into account all current national federal state and local regulations It is the responsibility of the in Staller to ensure that the PIM 251 is safely installed in accordance with all such regula tions If the PIM 251 is suspended Electro Voice strongly recommends that the system be inspected least once a year if any sign of weakness or damage is detected remedial action should be taken immediately The Matrix Series enclosures are sus pended using the following approach which has been approved by an independent struc tural engineer Every enclosure incorporates six independent suspension points three on the top and three on the bottom A minimum of three points must be used at all times to sus pend the enclosure The suspension points which tie the top and sides of the enclosure together are made of structural aluminum Each suspension point mates to an Ancra 42546 10 locking fitting four are supplied with each enclosure ordered with this option EV 20562 and each point has
13. passband protection Roll off is 12 dB per octave and the 3 dB down points are 30 Hz EX 24 and XEQ 2 and 16 Hz or 32 Hz XEQ 3 Other high pass filters are available and one third octave equalizers can also be effective at providing the required protection USE IN MULTIPLES Cone loudspeakers may be stacked for greater acoustic output and a narrower beamwidth It is assumed that all cones are operating in unison or in phase At relatively low frequencies below about 150 Hz for the PIM 251 stacking produces addi tional acoustic output without altering disper sion When a common signal is applied a 6 dB increase in maximum acoustic output occurs The cones mutually couple and act as one cone with twice the area therefore twice the efficiency and twice the power capacity The additional cone area provides 3 dB more output and the additional power capacity accounts for the remaining 3 dB Specifically mutual coupling occurs at the fre quencies whose wavelengths are longer than one quarter the center to center distance be VOX MEN S Imt penne A T EEE ry vr DIS RA SSE ert TSE EE cR mc cocco teme RE RS SERA RRR RS REE o Si aS as ELECTRO VOICE a MARKIV company 6 MANUFACTURING PLANTS AT BUCHANAN I NEWPORT TN SEVIERVILLE TN I OKLAHOMA CITY OK GANANOQUE ONT 1995 B Litho in U S A ire a wae i NN cat Dag EI Ma EE ERE SE
14. t step down would require an enclosure with at least twice the volume Step down tuning of the PIM 152 can be achieved by plugging one of its two vents which lowers tuning from 50 to 35 Hz A foam vent plug part no 71489 is available from the Electro Voice Service Department If an appro priate low frequency boost and cut equaliza tion is applied the normal f of 55 Hz is reduced to 39 Hz It is suggested that the Electro Voice Dx34 digital processor or the XEQ 2 or XEQ 3 analog active crossover equalizers be used to provide the required equalization The XEQ 3 requires the optional EB29 35 EQ module The suggested equalization is an underdamped sec ond order high pass filter tuned to 35 Hz with a Q of 2 This provides a boost of 6 dB at the tuning frequency and a 12 dB per octave roll off below SUBPASSBAND SPEAKER PROTECTION Below the enclosure tuning frequency cone excursion increases rapidly Since acoustic output is also falling rapidly there is no utility in driving the system with signals much below tuning frequency While such signals may be in the program material they are often extrane ous such as a dropped microphone The step down equalization described in the Step Down section provides the required protection If the step down mode is not used the appropriate high pass corner frequency is about 0 8 the box tuning frequency Alternately the EX 24 XEQ 2 and XEQ 3 analog crossover equaliz ers can provide sub
15. tage applied to the positively marked input terminal produces a positive acoustic pressure at the front of the system Input Connections 10 screw terminals on barrier strip each driver can be individually accessed Enclosure Materials and Color Textured black painted 7 ply void free birch Grille Black powder coated vibration resistant steel removable Suspension Integral three point flying system accepts Ancra 42546 10 single stud tie down cargo fitting four fittings supplied with system see Suspending PIM 251 Enclosures section Dimensions see Figure 6 Height 1 01 m 39 9 in Width at Front 575 mm 22 7 in Width at Rear 359 mm 14 1 in Depth 438 mm 17 2 in Side Wall Draft Angle 15 Net Weight 47 2 kg 104 Ib Shipping Weight 52 7 kg 116 Ib DESCRIPTION AND APPLICATIONS The Electro Voice PIM 251 is a compact trap ezoidal sige speaker system for per manent installation Dual 15 inch woofers are mounted in an optimally vented enclosure The PIM 251 is part of the PI Matrix Series a highly flexible group of full range and low fre quency systems for applications where com pact systems are appropriate Many perform ing arts centers clubs auditoriums sports fa cilities and houses of worship are candidates for the PI Matrix Series The flexibility of the PI Matrix Series allows the designer to customize a system to both suit the acoustic environment and meet a wide variety of arc
16. ts on the top and three independent suspension on the bottom all of which shall mate with Ancra 42546 10 fittings Net weight shall be 47 2 kg 104 Ib The loudspeaker system shall be the Electro Voice PIM 251 Note The PIM 251 described above Is the standard configuration Acoustic and me chanical details will vary when different op tions are supplied UNIFORM LIMITED WARRANTY Electro Voice products are guaranteed against malfunction due to defects in materials or workmanship for a specified period as noted in the individual product line statement s be low or in the individual product data sheet or owner s manual beginning with the date of original purchase If such malfunction occurs during the specified period the product will be repaired or replaced at our option without charge The product will be returned to the customer prepaid Exclusions and Limita tions The Limited Warranty does not apply to a exterior finish or appearance b certain specific items described in the individual prod f SEE EE RE PE SES ESAS REE REI A at v uct line statement s below or in the indi vidual product data sheet or owner s manual c malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner s manual d malfunction resulting from misuse or abuse of the product or e malfunction occurring at any time after repairs have been made to the
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