Electro-Voice MTH-2.5/64B User's Manual
Contents
1. FIGURE 5 MTH 2 5 64B Directivity vs Frequency FREQUENCY IN HERTZ Ww DIRECTIVITY INDEX D DIRECTIVITY FACTOR Q FREQUENCY IN HEATZ FIGURE 6 MTH 2 5 64B Harmonic Distortion 130 A 2nd HARMONIC guli TT i Mot TUT T HA T SPL in cB 8 2030 50 100 200 500 1000 2000 5000 10000 20000 FREQUENCY IN HERTZ 219 HARMONIC _ Std HARMONIC cue FIGURE 7 MTH 2 5 64B Wiring Diagram 12 MFO REO REO 5 HORIZONTAL DIVISION VERTICAL MB OHMS NOM Oo BLACK BLACK 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 loudspeakers 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 28 and MT 48 loudspeaker models include the same rigging hardware allowing the different models to be mixed as necessary throughout an array The rigging track accepts New Haven NH32102 1 double stud ring fittings Individual rigging points have typical break2. limiting time delay polarity and gain adjustment the parameters of which all may programmed and stored by the user the mono three way configuration the Dx34 in cludes a factory preset for optimal performance of the MT 2 64B loudspeaker system the MTH 2 5 64B and MTL 2B systems combined that utilizes Linkwitz Riley 24 dB per octave cross over filters at 160 and 1 600 Hz Each output saction 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 output level controls set in 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 2 5 648 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_5 648 systems The Neutrik Speakon NL4MPR is used for both connections One mating Neu trik Speakon NL4FC cable end connector is supplied with each loudspeaker system 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
3. 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 A 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 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 5 64BCF carpeted is the version of the MTH 2 5 64B loudspeaker system that in cludes flying hardware MT systems incor FIGURE 2 MTH 2 5 648 Impedance vs Frequency FIGURE 3 MTH 2 5 64B Polar MTH 2 5 64B SPECIFICATION GRAPHICS FIGURE 1 MTH 2 5 64B Axial Frequency Response FIGURE 4 MTH 2 5 64B Beamwidth vs sac PLT mA HHHH SPL in dB te m 1908 raa FREQUENCY IN HERTZ IN DEGREES 608 VERTICAL ORIENTATION BEAMWIDTH IN DEGREES 608 HORIZONTAL ORIENTATION i a 4 IMPEDANCE OHMS UD CoS Ry OS tel al R I I
4. 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 sig nificantly smaller and lighter than would be obtainable with conventional loudspeaker sys tem designs The 2 5 64 may be com bined with other members of the MT 2B and 4 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 5 54 may be combined with any of the MTL 2 or MTL 4 low frequency sound reinforce ment systems The MTL 2Bis a low frequency system with a rectangular enclosure that is dimensionally identical to the MTH 2 5 64B For optimal acoustic performance of the MT loudspeaker systems the Electro Voice Dx34 digital electronic crossover equalization time delay limiter unit 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 MTH 2 5 64B dimensions were chosen for efficient truck pack and high density array design The sy
5. owners manual 9 malfunction re sulting from misuse or abuse of the product or malfunction occurring at any time after re pairs have been made to the product by 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 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 incidental or consequential 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 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 W
6. strength ratings of 3 750 4 000 pounds which translates to working load ratings of 750 800 pounds for a 5 1 safety factor Consult the MT Flying Manual for spe cific structural strength ratings and limitations The enclosures may be oriented with the rig ging track on the sides of the enclosure or on the top and bottom arid may be daisy chained together as long as the safety factor is 5 1 or greater and local regulations are met Electro Voice offers a line of flying hardware accesso ries 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 Torotate 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 horns using a 1 8 inch hex key wrench lift the horns and rotate 90 Lower the horns 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 Inthe unlikely event that the MTH 2 5 64B should require service both the midbass and high frequency dri
7. tains two modified DH1Amt 16 compression drivers manifolded onto a 60 x 40 constant directivity horn The modified OH1Amt 16 16 ohm 1 375 inch bolt on version of the OHTA 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 ouiputs of the two drivers are summed through the 22 high fre quency manifold U S Patent No 4 629 029 and coupled to an HP64S hom The HP64S is a member of the HP TransPianar horn series 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 horns 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 5 64B 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 5 64BCF flying and MTH 2 5 645 non flying systems are covered with black Ozite Super TNT carpeting the most rugged in the industry The MTH 2 5 64BCF system incorporates a two point flying system All models feature a black nylon cloth grille The 1 removable dolly is available for transport ing the MTH 2 5 64BCF and MTH 2 5 64BC on their sides APPLICATIONS The MTH 2 5 64B
8. 80 Loud speaker Power Rating Full Range Test which uses a shaped random noise signal to simu late typical 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 equaliza tion during power testing Specifically the MTH 2 5 64B passes the EIA RS 426 A 1980 power test with the following test parameters Midbass Section 600 watts 45 5 volts rms 91 0 volts peak 3 45 ohms each input Test Voltages Ra 1 15 x R High Frequency Section 150 watts Test Voltages 30 2 volts rms 60 4 volts peak R 1 15xR 6 10 ohms CROSSOVER EQ AND TIME DELAY The usable frequency ranges of the individual MTH 2 5 64B 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 cations one of the MTL 2 low frequency loud speaker systems is recommended for use with the MTH 2 5 64B For optimal acoustic perfor mance the Electro Voice Dx34 digital elec tronic crossover equalization time delay unit is recommended The 0 34 15 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
9. Eleciro Voice SHOWN WITHOUT GRILLE 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 16 25 Long Term Average Power Handling Capacity per EIA RS 426 A 1980 see Power Handling Section MB HF 600 150 watts Maximum Long Term Average Midband Acoustic Output 130 watts Sensitivity SPL at one meter indicated input power anechoic environment band limited pink noise signal MB HF 1 1 Watt 105 5 111 5 dB 600 150 Watts 133 5 133 5dB Beamwidth angie 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 60 20 10 900 20 000 Hz Vertical 40 20 10 Directivity Factor Q 600 to 20 000 Hz Median see Figure 5 19 5 14 0 10 1 Directivity Index 600 to 20 000 Hz Median see Figure 5 10 9 dB 2 4 dB 3 1 dB Distortion 120 dB SPL at 1 Meter Shaped Spectrum see Figure 6 Second Harmonic 200 Hz 1 6 1 000 Hz 1 4 3 000 Hz 1 9 10 000 Hz 2 5 Third Harmonic 200 Hz 0 9 1 000 Hz 1 3 3 000 Hz 0 1 10 000 Hz 1 8 Transducer Complement MB Two DL10X 10 inch drivers 60 x 40 fiberglass horn HF Two 1 variant compression drivers HP64S 60 x 40 horn
10. Impedance see Figures 2 amp 7 Nominal MB HF 8 8 ohms Minimum MB HF 4 6 7 0 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 New Haven NH32102 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 93 0 kg 205 Ib Shipping Weight 97 5 kg 215 10 DESCRIPTION The Electro Voice MTH 2 5 64B 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 MTH 2 5 64B isan active two way horn loaded 60 x 40 constant directivity system with a rectangular enclosure utilizing two high power MTH 2 5 64B Manifold Technology Midbass High Frequency Sound Reinforcement System Sonically improved lower midrange 60 x 40 constant directivity pattern Smaller MT rectangular enclosure Rotatable MB and 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 h
11. al vertical beamwidth of 40 The loudspeaker system shall have an enclosure constructed from 0 75 inch thick 14 ply birch plywood 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 New Haven NH32102 1 type double stud ring fittings if ap plicable The loudspeaker enclosure shall be 91 4 cm 36 00 in high 57 2 cm 22 50 in wide and 75 9 cm 29 88 in deep and shall weigh 93 0 kg 205 lb The loudspeaker sys tem shall be the Electro Voice MTH 2 5 64B MTH 2 5 64BCF MTH 2 5 64BC UNIFORM LIMITED WARRANTY Electro Voice products are quaranteed 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 owners 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 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
12. ardware midbass 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 enclosure This configuration results in remark ably high acoustic output from small encio sure The 2 5 64 may be combined with other members of the MT 2 and MT 4 loud speaker family The combination of the MTH 2 5 64B 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 5 64B series the MTH 2 5 64BCF carpeted finish with flying hardware and the MTH 2 5 64BC carpeted finish without flying hardware The MTH 2 5 64B 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 two drivers is summed through a midbass manifold U S Patent No 4 923 021 and coupled to a 60 x 40 constant directivity horn The square midbass horn may be rotated to tailor the direc tionality of the system to match specific acous tic requirements The MTH 2 5 64B high frequency section con
13. arranty 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 inciuding an 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 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 notice ELECTRO VOICE a MARK IV company 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS BUCHANAN NEWPORT SEVIERVILLE TN OKLAHOMA OK GANANOQUE ONT 1996 Litho in U S A Part Number 533181 i awn
14. es 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 datais shown in Figure 4 The Directivity Factor R Q and Directivity Index D are shown in Figure 5 Complete AcoustaCADD datais available for the MTH 2 5 64B loudspeaker system DISTORTION Distortion for the MTH 2 5 64B shown in Figure 6 was measured on axis in the farfield in an anechoic environment with an input signal that would result in a sound pressure level of 120dB at one meter The Dx34 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 real life conditions Besides utilizing industry standard power tests extreme in house power tests which push the performance boundaries of the loudspeakers are aiso performed for an extra measure of reliability The MT systems are rated as per the EIA RS 426 A 19
15. pair 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 authorized service center for repair The follow ing service parts are available from the Service Department in Buchanan Michigan MTH 2 5 64B Service Data Sheet 533183 HF 81138 XX 16 ohm 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 105 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 manifoided and coupled to a 60 x 40 constant directivity horn have a total input impedance of 8 ohms and have a power rating of 600 watts as per EIA RS 426 A 1980 The high frequency section shall operate from 1 200 20 000 Hz with a sensitivity of 111 5 dB for one watt at one meter and consist of two compression drivers collectively manifoided and coupled to a 60 x 40 constant directivity horn have a total input impedance of 8 ohms and have a power rating of 150 watts as per EIA RS 426 A 1980 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 60 and anomi n
16. stems 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 accommo dated in only three feet of truck floorlength 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 In addition there are wiring diagram labels in convenient locations inside the enclosure FREQUENCY RESPONSE The MTH 2 5 64B frequency response shown in Figure 1 was measured on axis in the farfield 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 tothe midband of the midbass section The sound pressure level was normalized for an equivalent one meter distance DIRECTIVITY The direciional response of the MTH 2 5 64B was measured an anechoic environment ata distance of 6 1 meters 20 feet using 1 3 octave filtered pink noise A full spherical mea surement system was used The Dx34 digital electronic unit was used to provide the neces crossover filters equalization and time delay The polar response of the loudspeaker system at selected 1 3 octave frequenci
17. vers can be accessed from the front of the enclosure by removing the grille using a 2 Phillips screwdriver and the horns using a 1 8 inch hex key wrench The 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 unbolted 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 EY Electro Voice Inc when replacing the midbass and high frequency horns special care must be taken to locate the rear flanges of the horns 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 5 648 loud speaker system A 10 inch midbass driver failure will require the entire driver to be returned to an authorized Electro Voice service center for re
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