Electro-Voice MH940P User's Manual
Contents
1. a 1 1 1 E RD Pt LALLE uay 8 P g g f S9 89 9 at C rc n i 5 ES wu 5 gt z t 5 2 5 8 9 5 5 u a oa mg Figure 2 Typical Axial Frequent R 1k Frequency HZ 88 8 Figure 3 Beamwidth vs Frequency 3 888 8 amp s334530 319NY 8P9 FREQUENCY Hz Figure 4 Directivity Factor and gp X3GN Directivity Index vs Frequency FREQUENCY Hz MH94OP Full Range Horn System with Passive Crossover Figure 5 Hanging Points MH940P Full Range Horn System with Passive Crossover Specifications Useable Frequency Response see Figure 1 150 20 000 Hz Power Handling Long term average broadband per EIA RS 426A See page 3 for com plete test description Mid bass Transducer DL10A SH with water resistant cone and Ring Mode Decoupling High Frequency Transducer DH2As2 compression driver on HP94 90 x 40 horn coaxially mounted to mid bass horn Nominal Impedance in pass band Mid Bass 300 watts 16 ohms Sensitivity High Frequency Sound Pressure Level 1 Meter 2 83 8 ohms Volts input band limited pink noise in Full Range anechoic environment 8 ohms 105 dB D C Resistance Average Efficiency Mid bass Mid Bass 6 2 Ohms 5 High Frequency High Frequency 5 8 ohms 25 Full Range Nominal Coverage2. Angle 7 2 ohms See figure 2 Construction Vertical One Piece black polyester and fiber 40 glass with composite reinforcement Horizontal Driver Input Connections 90 Screw terminals 10 on barrier strip USA 12000 Portland Ave South Burnsville MN 55337 Phone 952 884 4051 Fax 952 884 0043 Canada 705 Progress Avenue Unit 46 Scarborough Ontario Canada M1H2X1 Phone 416 431 4975 800 881 1685 Fax 416 431 4588 Germany Hirschberger Ring 45 D94315 Straubing Germany Phone 49 9421 706 0 Fax 49 9421 706 287 France Parc de Courcerin Allee Lech Walesa Lognes 77185 Marne la Vallee France Phone 33 1 6480 0090 Fax 33 1 6480 4538 Australia Unit 23 Block C Slough Business Park Slough Avenue Silverwater N S W 2128 Australia Phone 61 2 9648 3455 Fax 461 2 9648 5585 Hong Kong Unit E amp F 21 F Luk Hop Industrial Bldg 8 Luk Hop St San PO Kong Kowloon Hong Kong Phone 852 2351 3628 Fax 852 2351 3329 Japan 5 3 8 Funabashi Setagaya ku Tokyo 156 0055 J apan Phone 81 3 5316 5020 Fax 81 3 5316 5031 Singapore 3015A Ubi Rd 1 05 10 Kampong Ubi Industrial Estate Singapore 408705 P hone 65 746 8760 Fax 465 746 1206 Mexico Av Parque Chapultepec 66 201 Col El Parque Edo De Mexico 53390 Mexico Phone 452 5358 5434 Fax 452 5358 5588 UK 4 The Willows Centre Willow Lane Mitcham Surrey 4NX UK Phone 44 181 640 9600 Fax 44 181 646 7084 Africa Mid East Hirschberger Ring 45 D94315 Strau
3. RS 426 A 1980 was used The specification uses random noise spectrums which mimic typical music and test the thermal and mechanical capabilities of the components Extreme in house power tests which push the performance bound aries of the components are also performed and passed to ensure years of trouble free service The MH940P passes ANSI EIA RS 426 A 1980 with the following values R 6 9 ohms 1 15 x 300 watts Test voltage 45 5 volts rms 91 0 volts peak 6 dB Architects and Engineers Specifications The loudspeaker system shall be a two way horn loaded type The mid bass frequencies shall be reproduced by a single DL10X SH 25 4 cm 10 in driver coupled to a MH940P 90 x 40 constant directivity horn The high frequencies shall be reproduced by a 60 watt DH2As2 2 inch compression driver coupled to an HP94 90 x 40 constant direc tivity horn The mid bass and high frequency devices shall be coaxially mounted The sys tem will reproduce frequencies from 140 to 20 000 Hz and have a nominal coverage pat tern of 90 x 40 The directivity control shall be maintained down to 500 Hz The cross over frequency shall be 1 600 Hz The mod ule shall be capable of producing average sound levels in excess of 128 dB 1 watt 1 meter in the long term with short term peaks of 134 dB Provision shall be made to pro vide four safe suspension points made from 10 gauge steel The dimensio
4. High output high quality music and speech for stadium and performing arts venues Short throw fill in when used with the very large format MH stadium horns Large horn mouth provides uniform directivity control to 500 Hz for in creased intelligibility under difficult acoustic conditions integral suspension system for safe and easy installation DL10X SH mid bass driver with Ring Mode Decoupling RMD Tech nology for outstanding intelligibility and clarity Full Range Horn System with Passive Crossover MH940P Lae ee ee eee ee ree eee eee eee ee nua Description The Electro Voice MH940P is a two way horn loaded speaker system for permanent installation Because the mouth dimensions of both the mid bass and high frequency horns were correctly chosen and are large enough with respect to the wavelengths re produced the MH940P provides uniform directivity control down to 500 Hz This superior directivity control increases speech intelligibility and musical clarity in difficult acoustic environments Other horn systems with smaller radiating areas simply cannot provide the high degree of directional con trol associated with the MH940P Delivering smooth and extended perfor mance the high frequency section operates from 1 600 to 20 000 Hz and consists of a specially developed low profile DH2As2 compression driver coupled to an HP64 90 x 40 constant directivity horn The HP94 horn features integral
5. bing Germany Phone 49 9421 706 0 Fax 49 9421 706 287 Latin America 12000 Portland Ave South Burnsville MN 55337 Phone 952 887 7491 Fax 952 887 9212 www electrovoice Telex Communications Inc www telex com Telex Communications Inc 06 2001 Part Number 535257 Rev A Driver Polarity A positive voltage applied to the positive leads produces a positive acoustic pressure Hanging Hardware 4 Point black 10 gauge polyester powder coated steel Dimensions Height 68 6 cm 27 0 in Width 68 6 cm 27 0 in Length 71 1 cm 28 0 in Weight 27 2 kg 60 Ib Shipping Weight 33 6 kg 74 Ib Ey ElectroVoice U S A and Canada only For customer orders contact the Customer Service department at 800 392 3497 Fax 800 955 6831 For warranty repair or service information contact the Service Repair department at 800 685 2606 For technical assistance contact Technical Support at 866 76AUDIO Please refer to the Engineering Data Sheet for warranty information Specifications subject to change without notice
6. e product prepaid to Electro Voice Service or any of its authorized service rep resentatives 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 available from Electro Voice Service at 600 Cecil Street Buchanan MI 49107 800 234 6831 or FAX 616 695 4743 Incidental and Consequential Damages Excluded Product repair or replacement and return to the customer are the only remedies provided to the customer Electro Voice shall not be liable for any incidental or consequen tial 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 consequential damages so the above limitation or exclu sion 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 Speaker Sys tems are guaranteed against malfunction due to defects in materials or workmanship for a period of five 5 years from the date of origi nal purchase The Limited Warranty does not apply to burned voice coils or malfunctions such as cone and or coil damage resulting from improperly designed enclosures Electro Voice active electronics associated with the speaker systems are guaranteed for three 3 years from the date of original purchase Addi tional details are incl
7. fiberglass and zine construction for exceptional strength and performance Beamwidth control vanes in the horn throat correct all coverage anoma lies in the 10 to 20 kHz octave This horn and driver combination is securely mounted to the mid bass horn by a heavy duty steel bracket The mid bass system is composed of a DL10X SH 24 5 cm 10 in reproducer mounted on an MH940 90 x 40 mid bass horn The DL10X SH reproducer contains a Kevlar epoxy cone which is twice as strong as a conventional paper cone The mid bass section operates between 140 and 1 600 Hz and features a proprietary phase plug U S patent no 4 718 517 which ex tends the high end output to blend seamlessly into the coaxial high frequency section If the MH940P is used in a full range appli cation additional low frequency reinforce ment such as the PI115L or a TL series en closure may be required Ring Mode Decoupling RMD The MH940P 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 in tended sound to be heard by the audience Applications The MH940P has been designed specifically with the permanent installation market in 1 Kevlar is a registered trademark of DuPont EleclroVoice mind Spor
8. gnal of one third octave filtered pink noise at the frequencies indicated A full spherical measurement system which is fully compatible with Electro Voice Audio s AcoustaCADD computer aided design program was used All directional infor mation was measured at 6 1 meters 20 feet Figure 6 illustrates the nominal horizontal and vertical polar responses with the long system axis vertical If the mid bass high frequency module is rotated then the hori zontal and vertical polars should be inter changed Figure 2 illustrates the horizontal and verti cal beamwidths Beamwidth is the angle at which the horizontal and vertical polar re sponses have decreased in level by 6 dB when compared to the on axis frequency response Figure 3 represents the total directivity of the MH940P The directivity factor R Q is the relative value at a point when com pared to an ideal spherical response The directivity index D is calculated by D 10 In the unlikely event the MH940P requires service each driver can be replaced or re paired A service data sheet is available from Electro Voice Power Handling Capacity Electro Voice components and systems are manufactured to exacting standards ensur ing they will hold up not only through the most rigorous of power tests but also through continued use in arduous real life conditions The EIA Loudspeaker Power Rating Full Range ANSI EIA
9. ns shall be 68 6 cm 27 0 in tall 68 6 cm 27 0 in wide and 71 1 cm 28 0 in deep Weight shall be 33 6 kg 74 Ib The loudspeaker system shall be the Electro Voice MH940P 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 prod uct data sheet or owner s manual beginning with the date of original purchase If such malfunction occurs during the specified pe riod the product will be repaired or replaced at our option without charge The product will be returned to the customer prepaid Ex clusions and Limitations The Limited Warranty does not apply to a exterior fin ish or appearance b certain specific items described in the individual product line statement s below or in the individual prod uct data sheet or owner s manual c mal function resulting from use or operation of the product other than as specified in the MH94OP Full Range Horn System with Passive Crossover product data sheet or owner s manual d malfunction resulting from misuse or abuse of the product or malfunction occurring at any time after repairs have been made to the product by anyone other than Electro Voice Service or any of its authorized service rep resentatives Obtaining Warranty Service To obtain warranty service a customer must deliver th
10. on Electro Voice strongly recommends that each MH940P be suspended independently using at least three of the four suspension points provided CAUTION The MH940P speaker systems should be suspended overhead only in ac cordance with the procedures and limitations specified in the installation manual included with the systems Connections Each frequency section can be individually connected via 10 screw terminals All driv ers are connected with the same polarity A positive voltage applied to the positively marked terminal produces a positive acous tic pressure at the front of the system Crossover The MH940P comes equipped with a built in passive crossover for easy full range op eration from a single amplifier channel For best performance in your installation broad band equalization is recommended If de sired the MH940P can be easily wired for bi amplified operation refer to the MH940C specification sheet for active crossover rec ommendations Frequency Response The MH940P axial frequency response was measured in Electro Voice s large anechoic chamber at a distance of 3 meters 10 feet with a swept sine wave input see Figure 1 It has been normalized for 1 watt 1 meter into the mid bass section Minimal level adjust ment and equalization have been used Directivity The directional characteristics of the MH940P were measured in Electro Voice s large anechoic chamber with a test si
11. ts arenas performing arts cen ters auditoriums and large gymnasiums are all candidates for the MH940P With its su perior directivity control the MH940P is a system that can be used in almost any situa tion The concert sound pedigree of the MH940P is evident by the ease of installa tion and by the use of professional grade components throughout the line Suspending MH940P Enclosure Suspending any object is potentially danger ous and should only be attempted by indi viduals who have a thorough knowledge of the techniques and regulations of rigging objects overhead Electro Voice strongly rec ommends that the MH940P be suspended taking into account all current national fed eral state and local regulations It is the re sponsibility of the installer to ensure the MH940P is safely installed in accordance with all such regulations If the MH940P is suspended Electro Voice strongly recommends that the system be in spected at least once a year If any sign of weakness or damage is detected remedial action should be taken immediately The MH940P can be suspended using the two front brackets and the rear U bracket MH940OP Full Range Horn System with Passive Crossover see Figure 5 The rear U bracket must be screwed to the rear cover with the bolts provided Each of the mounting brackets contain a 3 4 in diameter hole through which a shackle or chain link could pass The MH940P can be oriented in any directi
12. uded in the Uniform Limited Warranty statement Electro Voice FlyingHardware including enclosure mounted hardware and rigging accessories is guaranteed against malfunc tion due to defects in materials or workman ship for a period of one 1 year from the date of original purchase Additional details are included in the Uniform Limited War ranty statement Electro Voice Accessories are guaranteed against malfunction due to defects in mate rials or workmanship for a period of one 1 year from the date of original purchase Additional details are included in the Uni form Limited Warranty statement For warranty repair or service informa tion contact the service repair department at 616 695 6831 or 800 685 2606 For technical assistance contact Technical Support at 800 234 6831 or 616 695 6831 M F 8 00 a m to 5 00 p m Eastern Stan dard Time Specifications subject to change without notice MH940P Full Range Horn System with Passive Crossover 5 dB per division HORIZONTAL VERTICAL HAAN SON P ci x LYSED HK Ey Case 240 SEW 1 SEY 270 ES C NASR MH94OP Full Range Horn System with Passive Crossover NAHO9ZOD Full Range Horn System with Passive Crossover MHS40P Response 1 Watt 1 Meter Electro Voice
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