Electro-Voice MTH-2/94B User's Manual
Contents
1. The Dx34 is a programmable two in four out digital electronic unit which may be configured for stereo two way mono three way plus subwoofer or mono four way operation Each output section includes crossover filters equal ization limiting time delay polarity and gain adjustment the parameters of which all may be programmed and stored by the user In the mono three way configuration 0 34 in cludes a factory preset for optimal performance of the MT 2 94B loudspeaker system the MTH 2 94 and MTL 2B systems combined that utilizes Linkwitz Riley 24 dB per octave cross over filters at 160 and 1 600 Hz Each output section has equalization specifically matched to the loudspeaker system and time delay set to achieve zero lobing error and time alignment between frequency bands In addition the out put levels of each frequency band are set so that with the outputlevel controls setin the zero dB position the loudspeaker system will have a flat frequency response in an anechoic envi ronment when used with amplifiers having iden tical gain ELECTRICAL CONNECTION AND SYSTEM WIRING Electrical connections to the MTH 2 94B are made on the back of the enclosure via a 4 pin connector There are two connectors on the input panel to allow paralleling of other MTH 2 94B systems The Neutrik Speakon NL4MPR is used for both connections One mating Neu trik Speakon NL4FC cable end connector is supplied with each loudspeaker sys2. 1 or 800 234 6831 Specifications subject to change without notice ERR AM ST SHEARS ERB BAT FS FER PR I AANA KAARE DERA IE BD BO ER EE TH BSCE RATNER ERE NT cL NEE aE RG ENE Ey 25 22 aa ee RTS RL ET ELECTRO VOICE omarkivcompany 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS BUCHANAN NEWPORT TN SEVIERVILLE TN OKLAHOMA CITY OK GANANOQUE ONT Electro Voice Inc 1995 Litho in U S A Part Number 532445 9502 FSS Mc ASRS TE Tay LSA EIS ee EE Meo ee ce eae ee
3. 90 Lower the Rorns back into the enclosure mak ing sure that the rear flanges of the horns are correctly seated Special care must be taken to locate the rear flanges of the horns into the sealing gaskets Replace all screws that secure the front flange of the horns The screws should be firmly tightened but care should be taken not to overtighten FIELD SERVICE In the unlikely event that the MTH 2 94B should require service both the midbass and high frequency drivers can be accessed from the front of the enclosure by removing the grille using a 2 Phillips screwdriver and the horns using 1 8 inch hex key wrench midbass manifold assembly can be removed from the enclosure after removing the two screws on the back of the enclosure below the input panel and the drivers can be unbolted from the midbass manifold using a 5 32 inch hex key wrench There is a wiring diagram label for the midbass section located on the bottom of the enclosure near the drivers The high frequency drivers can be unboited from the manifold using 5 32 inch hex key wrench In addition the high frequency driver diaphragms can be replaced through the top handle holes using a 2 Phillips screwdriver There is a wiring diagram label for the high frequency section located on the HF driver support shelf near the drivers Note that when replacing the midbass and high frequency horns special care must be taken to locate the rear flanges of the ho
4. Electro Voice SHOWN WITHOUT GRILL SPECIFICATIONS Frequency Response measured in farfield calculated to one meter on axis swept sine wave one watt into midbass section anechoic environment see Figure 1 150 20 000 Hz Recommended Crossover Frequencies 160 Hz 1 600 Hz Efficiency MB HF 25 25 Long Term Average Power Handling Capacity per ANSI EIA 426 A 1980 see Power Handling Section MB HF 600 150 watts Maximum Long Term Average Midband Acoustic Output 180 watts Sensitivity SPL at one meter indicated input power anechoic environment band limited pink noise signal MB HF 1 Watt 107 5 111 5 dB 600 150 Watts 135 5 133 5 dB Beamwidth angle included by 6 dB down points on polar responses indicated one third octave bands of pink noise see Figures 3 and 4 400 20 000 Hz Horizontal 90 15 20 900 20 000 Hz Vertical 40 20 5 Directivity Factor R Q 600 to 20 000 Hz Median see Figure 5 17 9 3 0 8 5 Directivity Index 600 to 20 000 Hz Median see Figure 5 12 5 dB 1 2 dB 3 5 dB Distortion 120 dB SPL at 1 Meter Shaped Spectrum see Figure 6 Second Harmonic 200 Hz 0 7 1 000 Hz 0 8 3 000 Hz 2 8 10 000 Hz 4 7 Third Harmonic 200 Hz 0 4 1 000 Hz 1 5 3 000 Hz lt 0 1 10 000 Hz 2 5 Transducer Complement MB Two DL10X 10 inch drivers 90 x 40 fiberglass hom HF Two 1 variant compression drivers HP94S 90 x 40 ho
5. a sensitivity of 111 5 dB for one watt at one meter and consist of two compression drivers collectively manifolded and coupled to a 90 x 40 constant directivity horn have a total input impedance of 8 ohms and have a power rating of 150 watts as per ANSI EIA 426 A The overall system shall have a uniform on axis frequency re sponse from 150 20 000 Hz and shall have a nominal horizontal beamwidth of 90 and a nominal vertical beamwidth of 40 The loud speaker system shall have an enclosure con structed from 0 75 inch thick 14 ply birch ply wood be finished with a black carpet or a black textured paint have a black nylon grille and have a two point rigging system that will accept Kinedyne 32102 1 or 3211 1 1 type double stud ring fittings if applicable The loudspeaker enclosure shall be 36 00 inches high 22 50 inches wide and 29 88 inches deep and shall weigh 214 pounds The loudspeaker system shall be the Electro Voice MTH 2 94B MTH 2 94 or MTH 2 94BC UNIFORM LIMITED WARRANTY Electro Voice products are guaranteed against malfunction due to defects in materials or work manship for a specified period as noted in the individual product line statement s below orin 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 TEEN SATS TR STA replaced at our option without charg
6. compression drivers manifolded onto a 90 x 40 constant directivity horn The modified DH1Amt 16 16 ohm 1 375 inch bolt on version of the DH1A with a modified magnetic structure features a powerful motor structure and titanium diaphragm for maximum linear acoustic output extended high frequency response and accurate tran sient response The outputs of the two drivers MTH 2 94B SPECIFICATION GRAPHICS FIGURE 1 Axial Frequency Response FIGURE 4 Beamwidth vs Frequency 3 ap bate TT RT TT ENTIA SY AGM 190 yay py oe ea ieur amm FREQUENCY IN HERTZ FIGURE 6 Harmonic Distortion 130 are summed through the MTA 22 high fre quency manifold U S Patent No 4 629 029 and coupled to an HP94S hom The 945 is a member of the HP TransPlanar hom series U S Patent No 4 685 532 that features beam width control vanes as part of the waveguide to correct the very high frequency beamwidth anomalies that typically plague 2 0 inch throat homs The square high frequency horn may be rotated to tailor the directionality of the system to match specific acoustic requirements All versions of the MTH 2 94B are constructed of 0 75 inch thick 14 ply birch plywood and extremely well braced to survive the rigors of the road The MTH 2 94BCF flying and MTH 2 94BC non flying systems are covered with black Ozite Super TNT car
7. e The product will be returned to the customer pre paid Exclusions and Limitations The Lim ited Warranty does not apply to a exterior finish or appearance b certain specific items described in the individual product line statement s below or in the individual product data sheet or owner s manual malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner s manual d malfunction re sulting from misuse or abuse of the product or malfunction occurring at any time after re pairs have been made to the productby anyone other than Electro Voice or any ofits authorized service representatives Obtaining Warranty Service To obtain warranty service a cus tomer 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 available 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 replacement and return to the cus tomer are the only remedies provided to the customer Electro Voice shall not be liable for any incidental or consequential damages in cluding without limitation injury to persons or property or loss of use Some states do not allow the exclusion or limitation of
8. eal life conditions Besides utilizing industry standard power tests extreme in house power tests which push the performance boundaries of the loudspeakers are also performed for an extra measure of reliability The MT systems are rated as per the ANSI EIA 426 A Loudspeaker Power Rating Full Range Test which uses a shaped random noise signal to simulate typi cal music to test the mechanical and thermal capabilities of the loudspeakers The Dx34 digital electronic unit was used to provide the necessary crossover filters and equalization during power testing Specifically the MTH 2 94B passes the ANSI EIA 426 A power test with the following test parameters Midbass Section 600 watts Test Voltages 45 5 volts rms 91 0 volts peak Rsa 1 15 x R High Frequency Section 3 45 ohms each input EMAX 150 watts Test Voltages 30 2 volts rms 60 4 volts peak Rsa 1 15 xR 6 10 ohms CROSSOVER EQ AND TIME DELAY The usable frequency ranges of the individual MTH 2 94B sections are 150 2 000 Hz for the midbass section and 1 200 20 000 Hz for the high frequency section Crossover frequencies of 160 and 1 600 Hz with 24 dB per octave slopes are recommended For full range appli cations one of the MTL 2B low frequency loud speaker systems is recommended for use with the MTH 2 94B For optimal acoustic perfor mance the Electro Voice Dx34 digital elec tronic crossover equalization time delay unit is recommended
9. iltered pink noise A full spherical mea surement system was used The Dx34 digital electronic unit was used to provide the neces Sary crossover filters equalization and time delay The polar response of the loudspeaker system at selected 1 3 octave frequencies is shown in Figure 3 The frequencies selected are fully representative of the polar response of the system The beamwidth of the system utiliz ing the complete 1 3 octave polar data is shown in Figure 4 The Directivity Factor Q R and Directivity Index D are shown Figure 5 Complete AcoustaCADD datais available for the MTH 2 94B loudspeaker system DISTORTION Distortion for the MTH 2 94B shown in Figure 6 was measured on axis in the farfield in an anechoic environment with an input signal that would resultin a sound pressure level of 120 dB at one meter The 34 digital electronic unit was used to provide the necessary crossover filters equalization and time delay A 24 dB per octave high pass crossover filter at 160 Hz was applied to the low end of the midbass section A frequency spectrum typical of close miked rock music was employed The sound pressure level was normalized for an equiva lent one meter distance Plots of second and third harmonic distortion are shown referenced to the fundamental POWER HANDLING CAPACITY Electro Voice components and systems are manufactured to exacting standards to ensure reliability in continuous use in arduous r
10. incidental or consequential damages so the above limitation orexclusion may notapply 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 original purchase The Limited Warranty does notapply to burned voice coils or malfunctions such as cone and or coil damage resulting from improp erly designed enclosures Electro Voice active electronics associated with the speaker sys tems 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 en closure mounted hardware and rigging acces sories 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 included in the Uniform Limited Warranty statement Electro Voice Accessories are guaranteed against malfunction due to defects in materials orworkmanship 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 616 695 683
11. ms into the sealing gas kets The screws securing the horns should be firmly tightened but not overtightened As a service convenience a hardware kit that in cludes 1 8 inch and 5 32 inch hex key wrenches and an assortment of spare screws and wash ers are included with every MTH 2 94B loud speaker system A10 inch midbass driver failure will require the entire driver to be returned to an authorized Electro Voice service center for repair A high frequency driver failure can be repaired in the field by replacing the diaphragm assembly or if desired the entire driver can be returned to an authorized service center for repair The follow ing service parts are available from the Service Department in Buchanan Michigan MTH 2 94B Service Data Sheet 53248 HF 81138 XX 16 ohm DH1A Diaphragm Kit 827 1431 Modified DH1Amt 16 Driver MB 810 1491 DL10X Driver ARCHITECTS AND ENGINEERS SPECIFICATIONS The loudspeaker system shall be a two way active midbass high frequency system The midbass section shall operate from 150 2 000 Hz with a sensitivity of 107 5 dB for one watt at one meter and consist of two 10 inch cone drivers each individually coupled to a midbass phase plug then collectively manifolded and coupled to a 90 x 40 constant directivity horn have a total input impedance of 8 ohms and have a power rating of 600 watts as per ANSI EIA 426 A The high frequency section shall operate from 1 200 20 000 Hz with
12. peting the most rugged in the industry The MTH 2 94BCF sys tem incorporates a two point flying system All models feature a black nylon cloth grille The RD 1 removable dolly is available for transport ing the MTH 2 94BCF and MTH 2 94BC on their sides APPLICATIONS The MTH 2 94B is ideal for any professional concert sound touring or permanent installa tion application requiring high sound pressure levels with low distortion from a compact sure The Manifold Technology design maxi mizes the acoustic output per enclosure frontal area acoustic output per enclosure bulk vol ume and acoustic output per enclosure weight of the loudspeaker system This enables loud speaker arrays to be constructed that are sig nificantly smaller and lighter than would be obtainable with conventional loudspeaker sys tem designs The MTH 2 94B may be com bined with other members of the MT 2B and MT 4B loudspeaker family providing the array designer a variety of coverage angles acoustic output and enclosure sizes from which to choose For full range applications the MTH 2 94B may be combined with any of the MTL 2B or MTL 4B low frequency sound reinforcement systems The MTL 2B is a low frequency sys tem with a rectangular enclosure that is dimen sionally identical to the MTH 2 94B For opti malacoustic performance ofthe MT loudspeaker systems the Electro Voice Dx34 digital elec tronic crossover equalization time delay imiter uni
13. rn Impedance see Figures 2 amp 7 Nominal MB HF 8 8 ohms Minimum MB HF 4 9 ohms 7 2 ohms Input Connections Two Neutrik Speakon NL4MPR Enclosure Materials Structural All Versions 14 ply birch plywood Finish Black carpet Hanging Two point flying system tracks accept Kinedyne 32102 1 and 3211 1 1 fittings Dimensions Height 91 4 cm 36 00 in Width 57 2 cm 22 50 in Depth 75 9 cm 29 88 in Net Weight 97 1 kg 214 Ib Shipping Weight 102 kg 224 Ib DESCRIPTION The Electro Voice 2 948 midbass high frequency loudspeaker system is a member of the family of Manifold Technology MT loud speaker systems designed for high level sound reinforcement in concert sound touring and permanent installation applications The 2 94 is an active two way horn loaded 90 x 40 constant directivity system with rectangular enclosure utilizing two high power MTH 2 94B Manifold Technology Midbass High Frequency Sound Reinforcement System e 90 x 40 constant directivity pattern Smaller MT rectangular enclosure Rotatable MB amp HF horns High acoustic output low distortion Manifold Technology enables smaller and lighter loudspeaker arrays MT systems with different coverage patterns and output capabilities may be mixed and matched Unique rigging scheme for flexible array design and quick assembly Available without rigging hardware midba
14. ss drivers in the midbass frequency band and two high power compression drivers in the high frequency band Both the midbass and high frequency horns may be rotated in the enciosure This configuration results in remark ably high acoustic output from a small enclo sure The MTH 2 94B may be combined with other members of the MT 2B and MT 4B loud speaker family The combination of the MTH 2 94B loudspeaker system and the MTL 2B low frequency loudspeaker system form the MT 2 94B full range system There are two models in the MTH 2 94B series the MTH 2 94BCF car peted finish with flying hardware and the MTH 2 94BC carpeted finish without flying hard ware The MTH 2 94B midbass section utilizes two high efficiency low distortion DL10X 10 inch midbass drivers coupled to a unique phase plug U S Patent No 4 718 517 An Aperiodic En hancer this phase plug extends the upper end response by making use of the fact that only the apex area of the cone near the voice coil is in motion at the higher frequencies and automatically adjusts the acoustic loading to maximize acoustic output The output of the four drivers is summed through a midbass manifold U S Patent No 4 923 021 and coupled to a 90 x 40 constant directivity horn The square midbass horn may be rotated to tailor the directionality of the system to match specific acoustic requirements The MTH 2 94B high frequency section con tains two modified DH1Amt 16
15. t is recommended Careful attention was paid to details to provide both the touring company and sound contractor a convenient and timesaving sound reinforce ment package The MT 2B dimensions were chosen for efficient truck pack and high density array design The systems may be stacked four high and three wide or three high and four wide in a standard truck box enabling 12 000 watts of sound system to be accommodated in only three feet of truck floor length The two point rigging system offers flexible array design and efficient assembly To facilitate service a variety of screws washers and hex key wrenches are provided with each loud speaker system addition there are wiring diagram labels in convenient locations inside the enclosure FREQUENCY RESPONSE The MTH 2 94B frequency response shown in Figure 1 was measured on axis in the farfield an anechoic environment using a swept sine wave signal The Dx34 digital electronic unit was used to provide the necessary crossover filters equalization and time delay No high pass crossover filters were applied to the low end of the midbass section One watt of power 2 83 volts rms at 500 Hz was applied to the midband of the midbass section The sound pressure level was normalized for an equiva lent one meter distance DIRECTIVITY The directional response of the MTH 2 94B was measured in an anechoic environmentata distance of 6 1 meters 20 feet using 1 3 octave f
16. tem The pin assignments are as follows Pin 1 MB Pin 1 MB Pin 2 HF Pin 2 HF The midbass section has two 8 ohm drivers however the acoustic loading of the phase plugs and horn increases their electrical imped ance to a nominal 16 ohms each These two drivers are wired in parallel resulting a single 8 ohm nominal load connected to Pins 1 1 The high frequency section has two 16 ohm drivers wired in parallel resulting in a single 8 ohm nominal load connected to Pins 2 2 wiring diagram of the loudspeaker system is shown in Figure 7 The electrical impedance versus frequency is shown in Figure 2 FLYING THE MT SYSTEMS A manual entitled the MT Flying Manual is available from Electro Voice and is included with each flying MT loudspeaker system A brief introductory overview is included here The MT Flying Manual should be consulted for com plete structural specifications and detailed in formation on safely suspending and using the MT systems The MTH 2 94BCF carpeted is the version of the MTH 2 94B loudspeaker system that in cludes flying hardware The MT systems incor SRS LIE EE SSL AES ae OT porate a unique two point flying system that permits a wide range of vertical angle adjust ment and offers maximum flexibility in array design and implementation for both touring sound and permanent installations The quick release aircraft L track type hardware design allows arrays of lo
17. udspeakers to be assembled and disassembled very quickly and offers such flexibility in the vertical angling of cabinets that pull up points are usually unnecessary Furthermore all of the flying MT 2B and 4 loudspeaker models include the same rigging hardware allowing the different models to be mixed as necessary throughout an array The rigging track accepts Kinedyne 32102 1 and 32111 1 type double stud ring fittings dividual rigging points have typical break strength ratings of 3 750 4 000 pounds which translates to working load ratings of 750 800 pounds for 5 1 safety factor Consult the 7 Flying Manual for specific structural strength ratings and limitations The enclosures may be oriented with the rigging track on the sides of the enclosure or on the top and bottom and may be daisy chained together as long as the safety factor is 5 1 or greater and local regula tions are met Electro Voice offers a line of flying hardware accessories for use with the MT loudspeaker systems CAUTION the MT loudspeaker systems should be suspended overhead only in ac cordance with the procedures and limita tions specified in the MT Flying Manual and manual update notices ROTATING THE HORNS To rotate the midbass and high frequency horns turn the enclosure face up and remove the grille using a 2 Phillips screwdriver Remove the screws securing the two homs using a 1 8 inch hex key wrench lift the horns and rotate
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