Electro-Voice MTH-2.5/64BT User's Manual
Contents
1. HP64S 60 x 40 horn impedance see Figures 2 and 7 Nominal MB HF 8 8 ohms Minimum MB HF 4 9 7 2 ohms Input Connections Two Neutrik Speakon NL4MP Enclosure Materials Structural All Versions 14 ply birch plywood Finish Black carpet Hanging Two point flying system tracks accept New Haven NH 32102 2 fittings Dimensions Height 91 4 cm 36 00 in Width at Front 57 2 cm 22 50 in Width at Back 28 3 cm 11 13 in Depth 75 9 cm 29 88 in Side Angles 15 each 30 wedge Net Weight 93 0 kg 205 Ib Shipping Weight 97 5 kg 215 Ib DESCRIPTION The Electro Voice MTH 2 5 64BT mid bass high frequency loudspeaker system is a mem ber of the family of Manifold Technology MT loudspeaker systems designed for high level sound reinforcement in concert sound touring and permanent installation applications The MTH 2 5 64BT is an active two way horn MTH 2 5 64BT Manifold Technology Mid Bass High Frequency Sound Reinforcement System Sonically improved lower midrange 60 x 40 constant directivity pattern Smaller MT trapezoidal enclosure Rotatable MB and HF horns e High acoustic output low distortion e Manifold Technology enables smaller and lighter loudspeaker arrays e MTsystems with different coverage patterns an output capabilities may be mixed and matched e Unique rigging scheme for flexible array design and quick assembly Available without rigging ha2. ITE AEA p MET SAET A A EEE paired or replaced atour option withoutcharge The product will be returned_to the customer prepaid Exclusions and Limitations The Limited 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 repairs have been made to the product by anyone other than Electro Voice or any of its authorized service representatives Obtaining Warranty Service To obtain warranty service a customer must deliver the product prepaid to Electro Voice or any ofits 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 p
3. have a uniform on axis frequency response from 150 20 000 Hz and shall have a nominal horizontal beamwidth of 60 and a nominal vertical beamwidth of 40 ET loudspeaker system shall have a trapezoi k enclosure with 15 angled sides forming a 30 wedge shall be constructed from 0 75 inch thick 14 ply birch plywood shall be finished with a black carpet shall have a black nylon grille and shall have a two point rigging system that will accept New Haven NH 32102 1 type double stud ring fittings if applicable The loudspeaker enclosure shall be 91 4 cm 36 00 in high 57 2 cm 22 50 in wide at the front 28 3 cm 11 13 in wide at the back and 75 9 cm 29 88 in deep and shall weigh 93 0 kg 205 lb The loudspeaker system shall be the Electro Voice MTH 2 5 64BT MTH 2 5 64BTCF or MTH 2 5 64BTC 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 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 re ELECTRO VOICE IV i 600 Gasik Electro Voice Inc 1996 Litho in U S A Str MANUFACTURING PLANTS AT BUCHANAN NEWPORT TN SEVIERVILLE TN OKLAHOMA CITY GANANOQUE ONT LA NEA ESE SRE TE
4. 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 64BT passes the EIARS 426 A 1980 power test with the following test parameters Mid Bass Section 600 watts 45 5 volts rms 91 0 volts peak 3 45 ohms each input Test Voltages 1 15 x High Frequency Section 150 watts Test Voltages 30 2 volts rms 60 4 volts peak Re 1 15 xR 6 10 ohms CROSSOVER EQ AND SIGNAL DELAY The usable frequency ranges of the individual MTH 2 5 64BT sections are 150 2 000 Hz for the mid bass section and 1 200 20 000 Hz for the high frequency section Grossover frequen cies of 160 and 1 600 Hz with 24 dB per octave slopes are recommended Forfull range applications one of the MTL 2B low frequency loudspeaker systems is recommended for use with the MTH 2 5 64BT For optimal acoustic performance the Electro Voice Dx34 digital electronic crossover equalization signal delay unit is recommended 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 signal delay polarity and gain adjustment the parameters of which all may be programmed and stored by the user In t
5. track accepts New Haven NH 32102 1 type double stud ring fittings Individual tigging points have typical break strength rat ings 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 specific structural strength ratings and limitations The enclosures may be ori ented 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 regulations are met Electro Voice offers a line of fiying 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 mid bass and high frequency horns turn the enclosure face up and remove the grille using a 2 Phillips screwdriver Re move the screws securing the two horns using 1 8 inch hex key wrench lift the horns and rotate 90 Lower the horns back into encio sure making 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 S
6. 000 20000 FREQUENCY IN HERTZ 2nd HARMONIC __ 31d HARMONIC mmaa FIGURE 7 MTH 2 5 64BT Wiring Diagram 12 na cri E ESSE TS ha GE a PS TEE a RL A NES a ee I EO EE LESS OS HEM SSR RRS SEES EIT RSE NE GHA SLT extended high frequency response and accu rate transient response The outputs of the two drivers are summed through the MTA 22 high frequency manifold U S Patent No 4 629 029 and coupled to an HP64S hom The HP64S is a member of the HP TransPlanar horn series U S Patent No 4 685 532 that features beamwidth 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 horns may be rotated to tailor the directionality of the system to match specific acoustic re quirements All versions of the MTH 2 5 64BT are con structed of 0 75 inch thick 14 ply birch ply wood and are extremely well braced to survive the rigors of the road The MTH 2 5 64BTCF flying and MTH 2 5 64BTC nonflying sys tems are covered with black Ozite Super TNT carpeting the most rugged in the industry The MTH 2 5 64BTCF system incorporates a two point flying system All models feature a black nylon cloth grille APPLICATIONS The 2 5 64 is ideal for any profes sional concert sound touring or permanent installation application requiring high sound pressure levels w
7. ERVICE In the unlikely event that the MTH 2 5 64BT should require service both the mid bass 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 a 1 8 inch hex key wrench The mid bass 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 mid bass manifold using a 5 32 inch hex key wrench There is a wiring diagram label for the mid bass section located on the bottom of the enclosure near the drivers The high fre quency drivers can be unbolted from the mani fold using a 5 32 inch hex key wrench In addi tion 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 mid bass EY ith RL ER ER Ta ae E and high frequency horns special care must be taken to locate the rear flanges of the horns into the sealing gaskets The screws securing the homs should be firmly tightened but not overtightened As a service convenience a hardware kit that includes 1 8 inch and 5 32 inch hex key wrenches and an assortment of spare screws and washers are included with every 2 5 64 loudspeaker system Failure o
8. Electo Voice SHOWN WITHOUT GRILLE tien T FRG SPECIFICATIONS Frequency Response measured in far field calculated to one meter on axis swept sine wave one watt into mid bass 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 Mid Band 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 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 4 700 20 000 Hz Horizontal 60 20 10 900 20 000 Hz Vertical 40 20 5 Directivity Factor Q 600 to 20 000 Hz Median see Figure 5 17 9 3 0 8 5 Directivity Index D 600 to 20 000 2 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 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 DH1A variant compression drivers
9. duct Electro Voice Inc 600 Cecil Street Buchanan Michigan 49107 616 695 6831 or 800 234 6831 Specifications subject to change without notice er are gta eet Buchanan Michigan 49107 Part Number 533184 9633
10. e 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 Fig ure 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 complete structural specifications and detailed information on safely suspending and using the MT systems The MTH 2 5 64BTCF carpeted is the ver sion of the MTH 2 5 64BT loudspeaker system that includes flying hardware The MT systems incorporate a unique two point flying system that permits a wide range of vertical angle adjustment and offers maximum flexibility in array design and implementation for both tour ing 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 un necessary Furthermore all of the flying MT 2 and MT 4 loudspeaker models include the same rigging hardware allowing the different models to be mixed as necessary throughout an array The rigging
11. f the 10 inch mid bass driver will re quire the entire driver to be returned to an authorized Electro Voice service Center for re 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 an authorized service center for repair The following service parts are available from the Service Department in Buchanan Michigan MTH 2 5 64BT Service Data Sheet 532484 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 mid bass high frequency system The mid bass 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 mid bass phase plug then collectively manifolded 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 manifolded and coupled to 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
12. he mono three way configuration the 0 34 cludes a factory preset for optimal performance of the MT 2 64B loudspeaker system the MTH 2 5 64BT 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 signal delay set to achieve zero lobing error and time align ment between frequency bands addition the output 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 environment when used with amplifi ers having identical gain ELECTRICAL CONNECTION AND SYSTEM WIRING Electrical connections to the MTH 2 5 64BT 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 2 5 64 systems The Neutrik Speakon NL4MPR is used for both connections One mating Neutrik Speakon NL4FC cable end connector is supplied with each loudspeaker systam The pin assignments are as follows Pin 1 MB Pin 2 HF Pin 1 MB Pin 2 HF The mid bass section has two 8 ohm drivers however the acoustic loading of the phase plugs and horn increases their electrical im pedance to a nominal 16 ohms each These two drivers are wired in parallel resulting in a singl
13. ith low distortion from a com pact enclosure The Manifold Technology design maximizes the acoustic output per en closure frontal area acoustic output per enclo sure bulk volume and acoustic output per enclosure weight of the loudspeaker system This enables loudspeaker arrays to be con structed thatare significantly smaller and lighter than would be obtainable with conventional loudspeaker system designs The MTH 2 5 64BT may be combined with other members of the MT 2 and MT 4 loudspeaker family provid ing the array designer a variety of coverage angles acoustic output and enclosure sizes from which to choose For full range applica tions the MTH 2 5 64BT may be combined with any of the MTL 2B or MTL 4B low fre quency sound reinforcement systems The MTL 2BT is a low frequency system with a trapezoidal enclosure thatis dimensionally iden tical to the MTH 2 5 64BT For optimal acous tic performance of the MT loudspeaker sys tems the Electro Voice Dx34 digital electronic crossover equalization signal delay limiter unit is recommended Careful attention was paid to details to provide both the touring company and sound contrac tor a convenient and time saving sound rein forcement package The MTH 2 5 64BT di mensions were chosen for efficient truck pack and high density array design The systems may be stacked three high and four wide or four high and three wide in a standard truck box enabling 12 000 watts of sound
14. ity of the system to match specific acoustic requirements The MTH 2 5 64BT high frequency section con tains two modified DH1Amt 16 compression drivers manifolded onto a 60 x 40 constant directivity horn The modified 1 16 16 ohm 1 375 inch bolt on version of the DH1A with a modified magnetic structure features a powerful motor structure and titanium dia phragm for maximum linear acoustic output MTH 2 5 64BT SPECIFICATION GRAPHICS FIGURE 1 MTH 2 5 64BT Axial Frequency Response with Dx34 presets see text COO AAA S a Be Ca ors eS Resse KEE Q WR P RR RN in IE PE BRR sR ERE URES REN LE ESA TRE EERE SRR META SEY FIGURE 4 MTH 2 5 64BT Beamwidth vs Frequency L MRG E TT R 25 E MAME WI CP ER E ML FREQUENCY IN HERTZ FIGURE 5 MTH 2 5 64BT Directivity vs Frequency FREQUENCY IN HERTZ DIRECTIVITY INDEX D dB 5 MTT FIGURE 6 MTH 2 5 64BT Harmonic Distortion 130 2nd HARMONIC mii T MN TT E T ESA i SPL in dB VAT TO a T A CT ae ETAT SRS LETT CLIT II TIUU A NTE T 2030 50 100 200 500 1000 2000 5000 10
15. rdware loaded 60 x 40 constant directivity system with a trapezoidal enclosure utilizing two high power mid bass drivers in the mid bass fre quency band and two high power compression drivers in the high frequency band Both the mid bass and high frequency homs may be rotated in the enclosure This configuration results in remarkably high acoustic output from a small enclosure The MTH 2 5 64BT may be combined with other members of the MT 2 and MT 4 loudspeaker family The combination of the MTH 2 5 648T loudspeaker system and the MTL 2B low frequency loudspeaker sys tem form the MT 2 64B full range system There are two models in the MTH 2 5 64BT series the MTH 2 5 64BTCF carpeted finish with fly ing hardware and the MTH 2 5 64BTC car peted finish without flying hardware The MTH 2 5 64BT mid bass section utilizes two high efficiency low distortion DL10X 10 inch mid bass drivers coupled to a unique phase plug U S Patent No 4 718 517 An Aperiodic Enhancer 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 mid bass manifold U S Patent No 4 923 021 and coupled to 60 x 40 constant directivity hom The square mid bass horn may be ro tated to tailor the directional
16. roperty 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 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 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 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 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 pro
17. system to be accommodated in only three feet of truck floor length The two point rigging system of fers flexible array design and efficient assem bly To facilitate service a variety of screws washers and hex key wrenches are provided with each loudspeaker system In addition there are wiring diagram labels in convenient locations inside the enclosure FREQUENCY RESPONSE The MTH 2 5 64BT frequency response shown in Figure 1 was measured on axis in the far field in an anechoic environment using a swept sine wave signal The Dx34 digital electronic unit was used to provide the necessary cross over filters equalization and signal delay No high pass crossover filters were applied to the low end of the mid bass section One watt of power 2 83 volts rms at 500 Hz was applied to the mid band of the mid bass section The sound pressure level was normalized for an equivalent one meter distance DIRECTIVITY The directional response of the MTH 2 5 64BT was measured anechoic environment at a 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 sary crossover filters equalization and signal 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 beamwid
18. th of the system utilizing the complete 1 3 octave polar data is shown in Figure 4 The Directivity Factor R Q and Directivity Index D are shown in Figure 5 Complete AcoustaCADD data is available for the MTH 2 5 64BT loudspeaker system DISTORTION Distortion for the MTH 2 5 64BT shown in Figure 6 was measured on axis in the far field in an anechoic environment with an input signal that would result in a sound pressure level of 120 dB at one meter The 0 34 digital elec tronic unit was used to provide the necessary crossover filters equalization and signal delay A 24 dB per octave high pass crossover filter at 160 Hz was applied to the low end of the mid bass section A frequency spectrum typical of close miked rock music was employed The sound pressure level was normalized for an equivalent one meter distance Plots of sec ond 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 reliable 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 also performed for an extra measure of reliability The MT systems are rated as per the EIA RS 426 A 1980 Loud speaker Power Rating Full Range Test which uses a shaped random noise signal to simu late typical music to
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