Electro-Voice MTL-2 User's Manual
Contents
1. E Kalamazoo Ave Kalamazoo 49007 Whirlwind Music Distributors Inc P O Box 1075 Hochester NY er Ihe MTL 2 enclosure contains DL18MT s each connected separately to the Neutrik socket At the Neutrik socket each driver presents a nominal 8 ohm load The pin arrangements are Pin 1 LF1 Pin 1 LF1 Pin 2 LF2 Pin 24 LF2 HANGING The MTL 2 has been conceived to fly from the outset It incorporates EV s exclusive wo pomt flying hardware permitting a wide aiming angles and maximum flexibility The cabinet is reiniorced and structurally sound allowing the MTL 2 and the MTH 2 to be combined to form tight arrays are recessed to avoid box to box interference when flying and during transporta bon The track mates with Aeroquip 32102 fittings IQs range ol tracks detailed flying manual is supplied with each System Particular attention should be given to the safety aspects discussed Electro Voice accepts no responsibility if the cabinet is not used according to the recommendations given the manual If the cabinet is to be permanently installed overhead then Electro Voice strongly recom mends ihe removable grile be removed or screwed firmly to the cabinet E NEWPORT TN E n B ok o MARK IV company BUCHANAN Mi MER TN 1990 z Litho In U S A LLE 600 Cecil Street Buchanan Michigan 49107 WARRANTY Limited tecti Vides MT 2 Speakers Systems excluding acti2. N S W 2232 Australia 61 2 521 5322 This warranty gives you specific legal rights and you may also have other rights which vary from state to state or province lo province Service and repair address for this product Electro Voice Inc 600 Cecil Street Buchanan Mich gan 49107 Specifications subject to change without notice LAHOMA CITY Ok m GANANOQUE ONT Part Number 531476 01 2
3. most low frequency systems AcoustaCADD 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 1096 and 10096 rated power The XEQ 3 electronic crossover and dedicated EO module were in operation when the measurements were taken POWER HANDLING CAPACITY To our knowledge Electro Voice was the first U S 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 contains more energy at extremely high and low frequencies than typical actual program adding an extra measure of reliability Third 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 peaks 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 avera
4. 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 3 dB Down Point 40 Hz Usable Low Frequency Limit 10 dB down point 37 Hz Half Space Reference Efficiency 5 Long Term Average Power Handling Capacity Per ElA Standard RS 426A see Power Handling Capacity section 800 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 2859 4759 529 63 100 Hz Vertical 240 41209 77 Directivity Factor R 63 100 Hz Median see Figure 4 1 84 dB 0 36 dB 0 37 dB Directivity Index D 63 100 Hz Median see Figure 4 2 66 dB 0 77 dB 0 99 dB Distortion 0 1 Full Power Input see Figure 5 Second Harmonic 50 Hz 0 6 100 Hz 0 5 Third Harmonic 50 Hz 0 694 100 Hz 0 2 Distortion Full Power Input see Figure 6 Second Harmonic 50 Hz 1 40 5 100 Hz 1 8 Third Harmonic 50 Hz 2 0 100 Hz 0 8 Transducer Complement
5. The small bulk volume and frontal area of the MTL 2 belies the performance obtainable with Manifold Technology and allows the construction of 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 XEQ 2 electronic crossover and the EQMT2 EQ modules produces a fully integrated full range sound system Both cabinets are dimensionally identical and have similar hardware A service data sheet is available for this product FREQUENCY RESPONSE The MTL 2 s optimum performance can be achieved using the dedicated low EQ module in the XEQ 3 electronic crossover Figure 1 shows such a response The measurements were made in an anechoic environment at one meter on axis with a one watt power input The response without EQ can be seen in Figure 1 DIRECTIVITY Figure 2 illustrates the directional characteristics of the MTL 2 The measurements were taken in EV s large anechoic chamber at a distance of 20 feet using pink noise at selected one third octave bands Beamwidth is illustrated in Figure 3 and Directivity Factor R amp Q and Directivity Index D in Figure 4 The figures demonstrate that the MTL 2 is more directional than
6. Two DL18MT Box Tuning Frequency 37 Hz Impedance Nominal Two 8 ohm loads Minimum Two 8 ohm loads Input Connections Neutrik Speakon NL4MPR Electro Voice a MARK IV company wme WITHOUT EO RA Ys eiim ME 5 EL FREQUENCY IN HERTZ FIGURE 1 Axial Frequency Response 1 Watt 1 Meter Model MIL 2 Manitold Technology Low Frequency Sound Reinforcement System SPL in dB 8 Enclosure Materials 14 ply birch plywood Finish Black Ozite Super TNT carpet Hanging Two point flying system tracks accept Aeroquip 32102 fittings Dimensions Height 91 4 cm 36 0 in Width 57 2 cm 22 50 it Depth 76 2 cm 30 0 in Net Weight 75 5 kg 166 Ib Shipping Weight 80 5 kg 177 Ib DESCRIPTION The Electro Voice MTL 2 Manifold Technology low frequency loudspeaker sysiem is designed to compliment the MTH 2 mid mah frequency loudspeaker system They combine to produce a high output compact concert sound rel nfor cement system ideally suited for both the touring and the fixed installation markets The MTL 2 is a vented DOx design incorporating two DL18MT woofers facing into a central manifold chamber Manifold Technology pioneered in the MTL 4 is an Electro Voice patented method U S patent no 4 733 749 ot combining the output of two or more drivers and increasing their acoustic load Compared to conventional direct radiating designs mani Xn
7. allows increased low frequenc ye fficiency and reduced distortion BEAMWIDTH IN DEGREES HORIZONTAL VERTICAL 160 Hz 200 Hz FIGURE 2 MTL 2 Polar Response Ya octave pink noise 4 volts at 20 feet AT SS 9 my wl Se El o ettr a ar B sol LIE m a ES e HORIZONTAL O eorex e IIH 20 30 so 100 1000 2000 5000 1000 FREQUENCY IN HERTZ FIGURE 3 MTL 2 Beamwidth vs Frequency E Whole Space anechoic gt 100 TEME P bm gt RN 2 20 so 00 5000 16000 20000 A FREQUENCY IN HERTZ FIGURE 4 MTL 2 Directivity Factor R5 Q and Directivity Index D vs Frequency Whole Space anechoic DIRECTIVITY INDEX D dB LEVEL IN dB LEVEL IN dB A 3 ae rH LL me El J Si IEF n fl STRE T PII FUNDAMENTAL 2nd HARMONIC uN 3rd HARMONIC FREQUENCY IN HERTZ FIGURE 5 MTL 2 Harmonic Distortion 0 1 Rated Power Input 80 watts 10 Feet on Axis Bp 7 H d 1 A A n ta a g 1 i E fi FUNDAMENTAL 2nd HARMONIC 3rd HARMONIC FREQUENCY IN HERTZ FIGURE 6 MTL 2 Harmonic Distortion 1 0 Rated Power Input 800 watts 10 Feet on Axis in a singularly compact box Typically the MTL 2 is 2 3 dB more efficient in the crucial 40 80 Hz region than a co
8. ge 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 EIA Standard RS 426A The EIA 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 with the usual constant percentage analyzer one third octave this shaping filter produces a spectrum whose 3 dB down points are at 100 Hz and 1 200 Hz with a 3 dB per octave slope above 1 200 Hz This shaped signal is sent to the power amplifiers with continuous power set at 400 watts into each of the 6 9 ohm EIA 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 contiuous power or 3 200 watts peak 105 volts peak per input This procedure provides a rigorous test of both thermal and mechanical failure modes SIGNAL PROCESSING The MTL 2 has been designed to be used with the MTH 2 A dedicated set of modules have been designed for the XEQ 3 to maximize their performance It is recom mended that the modules be used The low EQ module not only pr
9. mparable horn Manifolding in this configuration has the added benefit of exposing the magnet assemblies to help minimize thermal Duild up The DML 18MT 18 inch woofer was design ed specifically for manifolding to achieve optimal performance in 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 Ring TIR M and PROTEF coating The TIR acts as a contro 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 of the top plate to physically protect the voice coil from rubbing during violent 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 point flying is installed as standard The Aeroquip style tracks are recessed below the surface to prevent damage and mechanical 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 in mind Whether used in regional touring or fixed installations the MTL 2 delivers high level low distortion low frequency performance
10. ovides response correction but subpassband protection as well Full details are available with the dedicated EQ modules called EQMT2 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 12 dB per octave 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 distortion 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 in the Thiele Small parameter Xmax One of the benefits of the MTL 2 Manifold Technology design is thal with full power input 400 watts the maximum recommended cone excursion of the DL18MT woofer is not exceeded for any frequency above the box tuning frequency of 37 Hz Therefore the only limi
11. tation of the MTL 2 low frequency system in the recom mended frequency range is the thermal inpu power Cone excursion increases substantially below 37 Hz see Subpassband Speaker Protection section USE IN MULTIPLES MTL 2 s may be used in 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 systems are located side by side For operation at very low frequencies the woofer cones mutually acting as one system with cone area and power of a single area doubles 5 ef CIENCY couple handling capacity twice that The doubling of cone providing a 3 dB ow WU wide y system the lev el increase tends to be limited dB power handling increase spaced to the 3 SYSTEM POSITIONING Subwoofer systems such as the MTL 2 are often located on the floor This is both convenient and can provide a desired high acoustic impact when the Speakers for example placed near the periphery of a dance floor In other installations such theatre or auditorium the audible location of a subwooler operating at sufficiently low crossover irequency below about 150 Hz will not be particularly evident The other stem elements operating above the are asa range be positioned for the desired locational cues and unitorm a
12. udience coverage Floor location provides the acoustic half space environment associated with the 5 system efficiency noted in the MUS fications section Location at a floor wall iunction acoustic quarter space do bes efficiency a 34 dB increase In sound pressure level and lends to promote the full excitation of more room modes or standing waves important chievina maximum overall bass output in the room Corner placement acoustic eiahth space doubles efficiency again and guarantees excitation of all room modes ch placement for maximum efficiency and roorrmode excitation is not necessary and may not be desirable or possible for a variety of reasons including esthetics and practicality Ihe MTL 2 can also be s successfully operated away from any nearby acoustic Doundaries par cularly when multiple systems are used for ncreased output ability see Use in Multiples section such as in a flown concert System CONNECTIONS The MTL 2 is equipped with two Neutrik Speakon NLAMPR connectors The connec lors marked INPUT and OUTPUT and are OElectro Voice Inc ELECTRO VOICE INC MANUFACTURING PLANTS A7 installed in parallel allowing additional MTL 2 s to be attached One mating Neutrik Speakon NLAFC is supplied with each locking self an OOnnecior C C Ti TH ac 1 nara rr trc A Syster ese connectors are a mme polarizing and capable of Pro Co Sound Inc 135
13. ve electronics guaranteed for five years from date of T Manuncuon due to defects in s and ao ayar ISL workmanship and materials If such maltunction occurs unit will be repaired or replaced at our without charge for materials or labor if delivered prepaid to the proper Electro Voice service facility Unit will be returned prepaid Warranty does not extend to appearance items burned coils or malfunction 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 exclusion or limitation of hinish incidental or consequential damages so the above exclusion may not apply to you Repair Oy other than Electro Voice or its authorized e agencies will void this guarantee A list of authorized service centers is available Electro Voice Inc 800 Cecil Street Buchanan MI 49107 AC 616 695 6831 Electro Voice West 8234 Doe Avenue Visalia CA 93291 AC 209 651 7777 Or Mark IV Audio Car Inc 345 Herbert St Gananoque Ontario Canada K7G 2V1 AC 613 382 2141 Elec tro Voice S A Kellenstrasse 5 CH 2563 IPSACH Switzerland 4132 51 58 33 Electro Voice Ltd 2 5 80 Izumi Suginami ku Tokyo Japan 168 81 3 325 7900 Mark IV Vertriebs GmbH Larchenstrasse 99 6230 Frankfort Main 80 e many 49 69 380 100 Electr ce Pty 59 o Voice Y car I Wh from and nada Waratah SL Kirrawee
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