Electro-Voice MTH 2.5/42BT User's Manual
Contents
1. SHOWN WITHOUT GRILL Sekt RO aC a ee 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 ANSI EIA 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 5 116 dB 600 150 Watts 133 5 138 dB Beamwidth angle included by 6 dB down points on polar responses indicated one third octave bands of pink noise see Figures 3 and 4 900 20 000 Hz Horizontal 40 20 5 900 20 000 Hz Vertical 20 36 3 Directivity Factor R Q 800 to 20 000 Hz Median see Figure 5 31 6 43 3 16 0 Directivity Index D 800 to 20 000 Hz Median see Figure 5 15 0 dB 3 5 dB 3 1 dB Distortion 120 dB SPL at 1 Meter Shaped Spectrum see Figure 6 Second Harmonic 200 Hz 2 5 1 000 Hz 1 4 3 000 Hz 1 4 10 000 Hz 2 5 SEES DES SER PS Ti te PT HS aS IT Third Harmonic 200 Hz 0 8 1 000 Hz 1 3 3 000 Hz 0 1 10 000 Hz 1 4 Transducer Complement MB Two DL10X 10 inch drivers 40 x 40 fiberglass horn HF Two DH1A var2. 8 pe a Se St Ee 2 SEE ea I Se eel ES ae Se me AE Se Be SU We aCe mee 2588 BRR ms Sm a ee ee SS Sas SS oe oe Se ae Reha SaaS az 05082 06 Oe Miss lj N 952 7 SEERA AL E TT WNI 02 20 50 1000 2000 5000 10000 20000 2030 50 2 7 W SYD I SMN Wine AS FREQUENCY IN HERTZ Srd HARMONIC 2nd HARMONIC FIGURE 7 Wiring Diagram 5 DIVISION Long box axis vertical GRE e es aior eS apas ful motor structure and titanium diaphragm for maximum linear acoustic output extended high frequency response and accurate transient re sponse 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 645 horn 645 is 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 requirements Allversions ofthe MTH 2 5 42BT are constructed of 0 75 inch thick 14 ply birch ply
3. aE 3 2 5 42 an active two way hom loaded 40 x 20 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 horns may be rotated in the enclosure This configuration results in remarkably high acoustic output from a small enclosure The MTH 2 5 42BT may be combined with other members of the MT 2B and MT 4B loudspeaker family The combina tion of the MTH 2 5 42BT loudspeaker system and the MTL 2B low frequency loudspeaker system form the MT 2 646 full range system There are two models in the MTH 2 5 425T series the MTH 2 5 42BTCF carpeted finish with flying hardware and the MTH 2 5 42BTC carpeted finish without flying hardware The MTH 2 5 42BT 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 atthe 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 a 40 x 20 constant directivity horn The square mid b
4. 42BTC 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 pur HS 2 a MARK IV company chase 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 owner s manual d malfunction re sulting from misuse or abuse of the product or e malfunction occurring at any time after re pairs 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 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 invoi
5. B 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 coupledto a40 x20 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 1980 The high frequency section shall operate from 1 200 20 000 Hz with a sensitivity of 116 dB for one watt at one meter and consist of two com pression drivers collactively manifolded and coupled to a 40 x 20 constant directivity hom have a total input impedance of 8 ohms and have a power rating of 150 watts as per ANSI EIA 426 A 1980 The overall system shall have auniform on axis frequency response from 150 20 000 Hz and shall have a nominal hori zontal beamwidth of 40 and a nominal vertical beamwidth of 20 The loudspeaker system shall have a trapezoidal 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 black nylon grille and shall have a two point rigging system that will accept New Haven 32102 1 or 32111 1 type double stud ring fittings if appli cable The loudspeaker enclosure shall be 36 00 inches high 22 50 inches wide atthe front 11 13 inches wide at the back and 29 88 inches deep and shall weigh 205 pounds The loudspeaker systemshall be the Electro Voice MTH 2 5 42BT MTH 2 5 42BTCF or MTH 2 5
6. ING 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 also performed for an extra measure of reliability The MT systems are rated per the EIA Loudspeaker Power Rating Full Range ANSI EIA RS 426 A 1980 which uses a shaped random noise signal to simulate typical music to test the mechanical and thermal capabilities of the loudspeakers The Dx34 digi tal electronic unit was used to provide the neces sary crossover filters and equalization during power testing Specifically the MTH 2 5 42BT passes the ANSI EIA 426 A power test with the following test parameters Mid bass Section Emak 600 watts Test Voltages 45 5 volts rms 91 0 volts peak Reg 115x R 3 45 ohms each input High Frequency Section 150 watts Test Voltages 30 2 volts rms 60 4 volts peak Reg 1 45xR 6 10 0hms CROSSOVER EQ AND SIGNAL DELAY The usable frequency ranges of the individual MTH 2 5 42BT sections are 150 2 000 Hz for the mid bass section and 1 200 20 000 Hz for the high frequency section Crossover frequen cies 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 f
7. TH 2 5 42BT systems The Neutrik Speakon NL4MPR is used for both connections One mating Neutrik Speakon NL4FC cable end connector is supplied with each loudspeaker system Ths pin assignments are as follows Pin 1 MB Pin 2 HF Pin 1 MB Pin 2 The mid bass 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 resultingin asingle 8 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 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 5 42BT CF carpeted is the version Cunt ATi AEREE SRLS ENE RHEE TLR TL oo aac ne BMA PO ale aR AE of the MTH 2 5 42BT loudspeaker system that includes
8. ass horn may be rotated to tailor the directionality of the system to match specific acoustic requirements The MTH 2 5 42BT high frequency section con tains two modified DH1Amt 16 compression drivers manifolded onto a 40 x 20 constant directivity horn The modified DH1Amt 16 1 375 inch bolt on version of the DH1A with a modified magnetic structure features a power Eee Ree pC ERE REE tS SS ES 8 a i 1 MTH 2 5 42BT SPECIFICATION GRAPHICS gt amp S S 5 gt E 9 FIGURE 1 Axial Frequency Response H E a i l H I I H H E 8 9 5335930 HLOIMAVae 8 9 S334930 FIGURE 2 Impedance vs Frequency Frequency FIGURE 5 Directivity vs FREQUENCY IN HERTZ XSGNI FIGURE 3 Polar Response ZIS A FREQUENCY IN HERTZ SRP ANA si 52 02 FIGURE 6 Harmonic Distortion N UP E SEE 225 J 457 on eee eS Ee ie ES ss ee a SS 2 FAE E F 5 0 oe 2 520 A gt 7 0 a e
9. can be re placed through the top handle holes using a 2 Phillips screwdriver There is a wiring diagram ELECTRO VO Ey label for the high frequency section located on the HF driver support shelf near the drivers Note that when replacing the mid bass 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 horns should be firmly tightened but not over tightened As a service convenience a hard ware 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 MTH 2 5 42BT loudspeaker system Failure of the 10 inch mid bass driver will re quire the entire driver to be retumed 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 42BT 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 d
10. ce 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 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 notapply to burned voice coils or malfunctions such as cone and or coil damage resulting fromimprop 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
11. flying hardware The MT systems in corporate 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 2B and MT 4B 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 NH 32102 1 type double stud ring fittings Individual rig ging points have typical break 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 theMT Flying Manual for specific structural strength ratings and limi tations 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 regulations 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 ti
12. iant compression drivers HP42S 40 x 20 hom Impedance see Figures 2 amp 7 Nominal MB HF 8 8 ohms Minimum MB HF 4 9 7 20hms 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 1 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 42BT 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 Manifold Technology Mid bass High Fre quency Sound Reinforce ment System Sonically improved lower midrange 40 x 20 constant directivity pattern Smaller MT trapezoidal 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 SARs
13. oice Dx34 digital elec tronic crossover equalization signal delay imiter unitis recommended Careful attention was paid to details to provide both the touring company and sound contractor convenient and time saving sound reinforce ment package The MT 2B dimensions 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 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 5 42B7 frequency response shown in Figure 1 wasmeasured on axis the far field Se EES SS AIS AER IE Te I inan anechoic environment using a swept sine wave signal The Dx34 digital electronic unit was used to provide the necessary crossover 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 lavel was normalized for an equivalent one meterdistance DIRECTIVITY The direc
14. ons specified 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 homs back into the 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 SERVICE In the unlikely event that the MTH 2 5 42BT 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 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 fromthe 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 frequency drivers can be unbolted from the manifold using a 5 32 inch hex key wrench In addition the high frequency driver diaphragms
15. or use with the MTH 2 5 42BT For optimal acoustic perfor mance the Electro Voice Dx34 digital elec tronic crossover equalization signal delay unit is recommended The 0 34 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 ba programmed and stored by the user In the mono three way configuration the Dx34 in cludes a factory preset for optimal performance ofthe MT 2 42B loudspeaker system the MTH 2 5 42BT 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 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 environment when used with amplifiers having identical gain ELECTRICAL CONNECTION AND SYSTEM WIRING Electrical connections to the MTH 2 5 42BT 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 M
16. 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 fora 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 F LOENEN AREE A REE EA A Hi y EVRE 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS BUCHANAN NEWPORT TN SEVIERVILLE TN OKLAHOMA CITY OK GANANOQUE ONT Electro Voice Inc 1996 Litho in U S A Part Number 533193 9607
17. tional response of the MTH 2 5 42BT was measured in anechoic environmentata 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 beamwidth of the system utiliz ing the complete 1 3 octave polar datais shown in Figure 4 The directivity factor Q R and directivity index D are shown in Figure 5 Complete AcoustaCADD data is available for the MTH 2 5 42BT loudspeaker system DISTORTION Distortion for the MTH 2 5 42BT shown in Fig ure 6 was measured on axis in the far field in an anschoic environment with an input signal that would resultin a sound pressure level of 120 dB at one meter The Dx34 digital electronic 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 equiva lent one meter distance Plots of second and third harmonic distortion are shown referenced to the fundamental POWER HANDL
18. wood and are extremely well braced to survive the rigors of the road The MTH 2 5 42BTCF flying and MTH 2 5 42BTC nonflying systems are covered with black Ozite Super TNT carpeting the most rug ged in the industry The MTH 2 5 42BTCF system incorporates a two point flying system All models feature a black nylon cloth grille APPLICATIONS The MTH 2 5 42BT is ideal for any professional concert sound touring or permanent installation application requiring high sound pressure levels with low distortion from acom pact enclosure The Manifold Technology de sign maximizes the acoustic output per sure frontal area acoustic output per enclosure bulk volume and acoustic output per enclosure weight of the loudspeaker system This en ables loudspeaker arrays to be constructed that are significantly smaller and lighter than would be obtainable with conventional loud speaker systems The MTH 2 5 42BT may be combined with other members ofthe MT 2B and MT 4B loudspeaker family providing the array designer a variety of coverage angles acoustic outputand enclosure sizes from which tochoose For full range applications the MTH 2 5 42BT may be combined with any of the MTL 2B or MTL 4B low frequency sound reinforcement sys tems The MTL 2BT is alow frequency system with a trapezoidal enclosure that is dimension ally identical to the MTH 2 5 42BT For optimal acoustic performance of the MT loudspeaker systems the Electro V
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