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****** Page 1 ****** SYSTEM IS SUPPLIED WITH GRILLE (NOT ILLUSTRATED) SPECIFICATIONS Frequency Response, One Meter on Axis, Swept One-Third-Octave Pink Noise, Anechoic Environment (see Figure 1): 40-200 Hz Low-Frquency a-dB-Down Point: 40 Hz Usable Low-Frequency Limit (10-dB-down point): 37 Hz Half-Space Reference Efficiency: Long-Term Average Power Handling Capacity Per ElA Standard RS-426A (see Power Handling Capacity section): watts Short-Term Power Handling Capacity (10 milliseconds): 3,200 watts Maximum Long-Term Average Midband Acoustic Output: 40 watts Sound Pressure Level at 1 Meter, Indicated Input Power, Anechoic Environ- ment, Band-Limited Pink-Noise Signal, 50-200 Hz, 1 Watt: 98 800 Watts: 131 3,200 Watts: 137 Dispersion Angle Included by 6-dB-Down Points on Polar Responses, Indicated Bands of One-Third-Octave Pink Noise (see Figure 3). 63-100 Hz Horizontal: 2850 (+750, -520) 63-1m Hz Vertical: Directivity Factor Re (Q), 63-100 Hz Median (see Figure 4): 1 A4 dB (+0.36 dB. dB) Directivity Index Dt. Hz Median (see Figure 4): 286 dB (+0.77 dB, -0.99 dB) Distortion. 0.1 Full Power Input (see Figure 5). Second Harmonic, 50 Hz: 0.60/0 100 Hz: Third Harmonic, 50 Hz: 100 Hz: Distortion, Full Power Input (see Figure 6), Second Harmonic, 50 Hz: too Hz: 1.80/0 Third Harmonic, 50 Hz: 100 Hz: Transducer Complernent: Two DL18MT Box Tuning Frequency: 37 Hz Impedance, Nominal: Two 8-ohm loads Minimum: Two 8-ohm loads Input Connections: Neutik Speakonw NL4MPR o MARK IV company 110 WITH EO WITHOUT EO FIGURE 1 Axial Frequency Respmse 1 w•W1 Meter Model MTL-2 Manifold Technology@ Low-Frequency Sound Reinforcement System Enclosure Materials: 14•ply birch plywood Finish: Black Ozite Super TNT carpet Hanging: Two-potnt flyjnq system (tracks accept Aeroquip 32102 fittings) Dimensions, Height: 91 a cm (360 In.) Width: 579 cm (2250 [n ) Depth: 769 cm (300 In) Net Weight: 75f0 kg (166 lb) Shipping Weight: 805 kg (177 lb) DESCRIPTION The Electro-Voice MTL-2 Manifold Technology*’ low-frequency loudspeaker system is designed to compl•rnent the MTH-2 rnid/htgh frequency loudspeaker system. They cornbne to produce a highoutput compact concert sound reinforcement system ideally suited for both the touring and the fixed installation markets. The MTL,2 ts a vented box design incorporating two DL18MT woofers facing into a central manifold chamber. Manifold Technology, pioneered in the MTL•4i is an Electro-Voice patented method (U.S. patent no. 4,733,749) Of combining the output of two. or more drivers. and Increasing their acoustic load. Compared to conventional direct radtattng designs, manifoldng allows increased low. frequency efficiency and reduced dtstortion

****** Page 2 ****** 63 Hz 100 Hz HORIZONTAL VERTICAL – 160 Hz 80 Hz 125 Hz 2Q0 Hz FIGURE 2 MTL-2 Polar Response (%-octave pink noise, 4 volts at 20 feet) u 200 HORIZONTAL O VER rtCAL FAEOI..JENCV JN HERTZ FIGURE 3 — MTL-2 Beamwidth vs. Frequency Whole Space (anechoic) €20 d NUMBERS INDICATE SPECIFIC VALUES 500 2000 FREOUENCY ‘N FIGURE 4 — MTL-2 Directivity Factor (Q) and Directivity Index Di vs. Frequency Whole Space (anechoic) 120 110 100 90 70 FUNDAMENTAL 2nd HARMONIC 3rd HARMONIC — 40 20 JO SO FREQUENCY IN HERTZ FIGURE 5 MTL-2 Harmonic Distortion, 0.1 Rated Power Input (80 watts), 10 Feet on Axis 130 120 110 100 70 60 FUNDAMENTAL 2nd HARMONIC 3rd HARMONtC 50 20 JO SO too soo o o FREQUENCY JN HERTZ FIGURE 6 MTL-2 Harmonic Distortion, 1.0 Rated Power Input (800 watts), 10 Feet on Axis

****** Page 3 ****** tn a singularly compact box. Typically, the MTL-2 is 2-3 dB more efficient in the crucial 40-80 Hz region than a comparable horn. Manifolding. in this configuration, has the added benefit of exposing the magnet assemblies to help minmize thermal buildup. The DMLw18MT 18•inch woofer was desgn- ed specifically for manifolding to achieve optimal performance tn the MTL•2 enclosure. Its design assures linear. low-distortion output, The high-power. high-excursion drive of the DL18MT is augmented by two exclusive Electro-Voice features. the Thermo Inductive TIRTM, and PROTEFTM coating. The TIR acts as a control on drive Inductance and. more importantly, provides a major heat.transfer path from the top of the drive coil. reducing thermal dynamic-range compression. PROTEF is a Teflon@-based coating applied to the inside diameter ot the top plate to physically protect the voice COII from rubbing during vtolent power peaks. The MTL-2 is designed to survive the rigors of the road. 14•ply birch plywood is used throughout. Electro-Voice’s unique two-pornt flying IS installed as standard. The Aeroquip style tracks are recessed below the surface to prevent damage and mechancal interference (see Hanging section). The cabinet is covered in black Ozite Super TNT carpet. the most rugged available. A black. nylon. cloth, grille is supplied as standard. APPLICATIONS The MTL-2 is designed with the professional end user tn rntnd. Whether used in regional touring or fixed installations the MTL•2 delivers high level. low distortion. low frequency performance. The small bulk. volume and frontal area of the MTL•2 belles the performance obtainable With Manifold Technology and allows the construction Ot compact. tight arrays. The dimensions of the MTL•2 were selected to allow efficient truck packing. All fittings and fixtures are recessed to allow easy pack- ing and unobtrusive installations. It is possible to use the MTL-2 to augment the bass of any system but it has been optimized to compliment the MTH-2 high- frequency cabinet. Combining the MTL-2 with the MTH-2, the XEQB electronic crossover and the EOMT2 EQ modules produces a fully integrated full-range sound system. Both cabinets are dimensionally identical and have similar hardvvare. A serme data sheet is available for this product. FREQUENCY RESPONSE The MTL-2’s optimum performance can be achieved ustng the dedicated low EQ module in the XEQ3 electronic crossover. figure 1 shows such a response The measurements were made in an anechoic environment at one meter on ax’S with a one-watt power input: The response without EQ can be seen in Figure 1. DIRECTIVITY Figure 2 illustrates the directional charactenstcs of the MTL•2. The measurements were taken in EV’s large anechoic chamber at a distance of 20 feet ustng Pink noise at selected one-third-octave bands. Beamwidth is illustrated in Figure 3 and Directivity Factor Re (O) and DwectWlty Index Do in Figure 4. The figures demonstrate that the MTL-2 ts more directional than most low-frequency systems. AcoustaCADDiM data is available for the MTL-2. DISTORTION Inherent in the Manifold Technology design are greatly reduced distortion components. when compared to conventional vented enclosures. Figure 5 and Figure 6 illustrate the second and third harmonic distortion components of the MTL,2 at 100/0 and rated power. The XEO•3 electronic crossover and dedicated EQ module were tn operation when the measurements were taken. POWER HANDLING CAPACITY To our knowledge. Electro-Voice was the first I-JS. manufacturer to develop and publish a power test closely related to real-life conditions. First, we use a random noise input signal because it contains many frequencies simultaneously, just like real voice or instrument program. Second. our signal contajns more energy at extremely high and low frequencies than typical actual program, adding an extra measure Of reliability. Thirds the test signal includes not only the overall “long•term average” or “continuous” level — which our ears interpret as loudness but also short- duration peaks which are many times higher than the average, just like actual program. The long-term average level stresses the spaker thermally (heat). The instantaneous test mechanical reliability (cone and diaphragm excursion). Note that the sine- wave test signals sometimes used have a much less demanding peak value relative to their average level. In actual use. long-term average peaks exist from several seconds on up, but we apply the long-term average for several hours, adding another extra measure of reliablity. Specifically, the MTL-2 is designed to withstand the power test described in ElA Standard RS-426A The ElA test spectrum is applied for eight hours. To obtain the spec- trum, the output of a white noise generator (white noise IS a particular type of or random noise with equal energy per bandwidth in Hz) is fed to a shaping filter with 6-dB-per- octave slopes below 40 Hz and above 318 Hz. When measured wuth the usual constant- percentage analyzer (one-thtrdoctave), this shaping filter produces a spectrum whose a-dB down points are at 100 Hz and t 200 Hz with a a-dB-per-octave slope above 1.2(JJ Hz. This shaped signal is sent to the power amplifiers with continuous power set at 400 watts into each of the 6.9-ohm ElA- equivalent-impedance inputs (52.5 volts true rms). resulting in a total of 800 watts Of continuous power being delivered to the MTL-2. Amplifier clipping sets instantaneous peaks at 6 dB above the confiuous power, or 3,20C watts peak (105 volts peak per Input). This procedure provides a rigorous test of both thermal and mechanical failure modes. SIGNAL PROCESSING The MTL2 has been designed to be used with the MTH•2. A dedicated set of modules have been designed for the XEC-3 to maximize their performance. It IS recom- mended that the modules be used. The • ‘low EQt• module not only provides response correction but subpassband protection as well. Full details are available with the dedicated EO modules. called EOMT2 and on the data sheet of the MTH•2. SUBPASSBAND SPEAKER PROTECTION If the MTL-2 is used without the MTH-2 and the recommended EQ module then subpass band protection should be incorporated. Below the enclosure tuning frequency. cone excursion increases rapidly with little acoustic output. It is therefore highly recommended that a high-pass filter be used. A 32•Hz 12dB•peroctave filter is sufficient. Without protection, subpassband signals may “bottom” the woofer. Damage may occur, especially if bottoming is repeated. Even if damage does not occur, amplifier power is wasted and modulation of the signal will impair performance . Woofer dtstortion and “muddy bass’ • are often caused by lack Of subpassband protection. LARGE-SIGNAL PERFORMANCE Speakers have two limitations that govern their large-signal, or maximum-output perfor- mance capabilities. One IS the speaker’s long•term average power capacity (related to thermal, or heat destruction). The second IS Its maximum linear cone-excursion ability (as expressed the Thiele-Small parameter, XmaJ One of the benefits of the MTL•2 Manifold Technology design IS that With full power input (400 watts) the maxmurn recommended cone excursion of the DL18MT woofer is not exceeded fot any frequency above the box•tuning frequency ot 37 Hz. Therefore, the only limitation of the MTL-2 low-frequency system tn the recom• mended frequency range IS the thermal tnpu: gnwer. Cone excurson Increases substantially below 37 Hz (see Subpassband Speaker Protection section). USE IN MULTIPLES MTL-2’s may be used tn multiples to Increase acoustic output. In the following discussion. it is assumed that all speaker cones are operating in unison (in phase) when a common signal is applied. A 6-dB increase In maximum acoustic output results when two speaker systerns are located side by side. For operation at very jow

****** Page 5 ****** frequencies, the woofer cones “mutually couple,” acting as one system with cone area and power-handling capacity twice that of a single system. The doubling of cone area doubles efficiency, providing a a-dB spaced, the level increase tends to be limited to the a-dB power-handing increase, SYSTEM POSITIONING Subwoofer systems such as the MT L-2 are often located on the floor. This IS both convenient and can provide a desired high acoustic impact when the speakers are, for example, placed near the periphery of a dance floor. In other Installations, such as a theatre or auditorium, the audible location ot a subwoofer operating at sufficiently low crossover frequency (below about 150 Hz) will not be particularly evident. The other system elements operating above the subwoofer range canebe positioned for the desired locational cues and uniform audience coverage. Floor location provides the acoustic half• space environment associated with the system efficiency noted in the Specifications section. Location at a floor-wall junction (acoustic quarter space) doubles efficiency (a 3-dB increase in sound pressure level) and tends to promote the full excitation of more room modes, or standing waves, important in achieving maximum overall bass output In the room. Corner placement (acoustic eighth space) doubles efficiency again and guarantees excitation of all room modes. (Such placement for maximum efficiency and room-mode excitation is not necessary and may not te desirable or possible for a variety of reasons. including esthetics and practicality) The MTL-2 can also sucxessfully operated away from any nearby acoustic O)undartes, partrcularty when multiple systems are used tar increased output ability (see Use in Mufiiples section), such as in a flown concert system, CONNECTIONS The MTL-2 is equipped with two Neutrik SpeakonTM NL4MPR connectors. The connec tors marked “INPUT” and “OUTPUT” and are installed in parallel allowing addittonal MTL-2s to be attached. One mating Neutrik SpeakonT’/ connector NL4FC is supplied with each system These connæors are locking, seli• polartzina and caoable of randl an Pro Co Sound Inc. 135 E. Kalamazoo Ave Kalamazoo, MI 49007 Whirlwind Music Distributors, Inc. P.O. Box 1075 Rcxhester. NY 14603 The MTL-2 enclosure contans two DL18MTis each connected separately to the Neutrik socket. At the Neutrik socket eadn driver presents a nominal g•ohrn load- The pin arrangements are: Pin 1- (-) Pin 1 + (+) Pin 2— = LF2 (—) Pln 2+ =LF2 (+) HANGING The MT L-2 has been conceived to ‘ ‘fly” from the outset It Incorporatæ EV’s exclusive two-pont flying hardware permitting a Wide range of aming angles and maximum flexibility, The cabinet ts reinforced and structurally sound allowing the MTL-2 and the MTH-2 to be combined to form tght arrays, The tracks are recessed to avoid ux-tcbox Interference when flyng and during transporta- ton. The track mates With Aeroquip 32102 fittings. A detailed flying manual IS supplied with each systern. Particular attention should be given to the safety aspects discussed. Electro-Vaæ acæpts no responsibility if the cabinet is not used according to the recommendations given in the manual. If the cabinet is to permanently overhead, then Electro-Voiæ strongly recom- mends the removable grille be removed or screwed firmly to the cabinet. WARRANTY (Limited) Electro-Voice MT-2 Speakers ard Speaker Systems (excluding active electronics) are guaranteed for five years from date ot original workmanship and materials. If such malfunction occurs. unit will be repaired or replaæd (at our option) without charge for matenals or labor if delivered prepaid to the proper Electro-Voice seæice facility. unit will be returned prepaid. Warranty does not extend to finish, apgkarance items, burned Wiis, or malfurction due to abuse or operation under other than specified conditions, nor does it extend to incidental or consequential damages. Some states do not allow the excluston or Imitation of tnclden!al or consequential damasF. so the above exclusion may not apply to you, Repar by other than Electro-Votce or its authorzed service agencies Will void this guarantee. A list of authorized service centers iS available from Electro-Voice, Inc. 600 Cecil Street, Buchanan, MI 49107 (AC/6166956831); and Electro-Voice West, 8236 Doe Avenue Visalia. CA 93291 (ACf209651-7777). or Mark W Audio Canada, Inc., 345 Herbert St., Gananoque. Ontarto, Canada K7G 2V1 (ACf613882-2141); El€strcVoice. SA.. Kellenstrasse 5i CHQ563 IPSACH, Switzerland (41)32-51-58-33: Ltd„ 2-580 Izumi, Suginam-ku, Tokyo, Japan 168. (81)3-32579W; Mark V Venriebs GmbH. Larchjenstrasse 99, 6230 FrankforVMain 80. Germany (49)69-3W100, Electro-Voice Pty 59 Waratah St., Kirrawee NSW 2232, Australia (61)2-521-5322. This warranty gives you legal rights. and YOU may also have other rights whch vary from state to state or province to province. Service and repair address for this product. Electro-Voice, Inc., 6(7) Cecil Street, Buchanan, Michigan 49107. Specifications subject to change without notice, ELECTRO-VOICE, INC., 600 Cecll Street, Buchanan, Mlchlgan 49107 MANI-JEACTURBKJ n BUCHANAN. n NEWPORT, OKLAHOMA 0K GANANOOUE. ONI @EIectro-voce. Inc. ‘990 Litho In 1.1 S A. Part Nurnber 53 a MARK IV company








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