Electro-Voice MTL-1 User's Manual
Contents
1. 155 Ib Shipping Weight 81 6 kg 180 Ib DESCRIPTION The Electro Voice MTL 1 is an 800 watt subwoofer loudspeaker system which com bines the attributes of both horn loaded and vented box designs The MTL 1 design utilizes the unique double SubScoop cabinet con struction with two DL18MT woofers as used in Manifold Technology concert systems The design behaves like a horn over much of its range but without the time delay and weight problems usually associated with conventional MTL 1 Double 18 inch SubScoop Low Frequency Speaker System Subwoofer for augmenting the low frequency performance of the MTH 1 mid high module and other stage systems e Two DL18MT woofers for reliable extended low frequency output 00 watt long term power capacity e Horn loading provides increased throw Rugged road ready cabinet metal grille black carpet finish Neutrik Speakon inputs Rear casters for improved portability designs Vented box principles take over for the lowest octave and assist in producing ex ceptionally high levels of clean punchy bass from a modest sized box The reverse woofer orientation has been used to optimize the rear chamber volume and decrease the horn flare rate for extended low end performance When used with the MTH 1 mid high module the MTL 1 provides high output sound rein forcement for a club large hall or outdoor events in a compact package which can be used easil2. 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 Ey 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 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 including 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 Limite
3. of a woofer is determined by the peak test voltage amount For the MTL 1 105 0 volt peak test voltage translates into 3 200 watts short term peak power handling capacity This is the equivalent of four times the average power handling capacity andis a peak that can be sustained for only a few milliseconds However this sort of short duration peak is very typical in speech and music Provided the amplifier can repro duce the signal accurately without clipping the woofer will also perform accurately and reliably even at these levels SUSPENDING MTL 1 ENCLOSURES The MTL 1 has been developed in conjunction with the HS series of hanging hardware The HS kit allows the MTL 1 to be hung safely in a variety of orientations The combination of the correct HS kit and the MTL 1 enclosure has been certified by an independent structural engineer to be safe and secure Each HS kit consists of a steel tube two brackets two eyebolis and the necessary fasteners The installer must assembie the HS kit by first drilling two holes into MTL 1 enclosure in predefined positions and then screwing the brackets onto the steel tube which passes through the enclosure Full instructions are included with each HS kit A single MTL 1 requires two 57 5 to suspend it horizontally or one HS7 to suspend it vertically For hanging in multiples two 57 5 are still needed for hang ing horizontally A maximum of two cabinets can be suspended in
4. Electro Voice SPECIFICATIONS Typical Axial Frequency Response swept sine wave 4 volts at 10 feet anechoic environment normalized for 1 watt 1 meter into woofer see Figure 1 50 160 Hz Low Frequency 3 dB Down Point 50 Hz Usable Low Frequency Limit 10 dB down point 45 Hz Half Space Reference Efficiency 6 1 Long Term Average Power Handling Capacity per EIA RS 426 A 1980 see Power Handling Capacity section 800 watts Sensitivity SPL at 1 watt 1 meter input anechoic environment swept sine wave 100 dB Dispersion Angle Included by 6 dB Down Points on Polar Responses Essentially omnidirectional Distortion 0 1 Full Power Input into Mid Bass see Figure 2 Second Harmonic 100 Hz 0 3 Third Harmonic 100 Hz 0 4 Transducer Complement Two DL18MT s Box Tuning Frequency 38 Hz Recommended Crossover Frequency 160 Hz Crossover Slopes suggested 24 dB per octave Impedance Nominal 4 ahms Minimum 3 ohms Input Connections Two paralleled Neutrik Speakon connectors Supplied Accessory Neutrik Speakon NL4FC input cable connector Suspension see Suspending MTL 1 Enclosures section HS7 independently certified hanging kits available Materials Enclosure Black carpet covered 3 4 in void free plywood Grille Black heavy duty perforated metal Enclosure Dimensions see Figure 3 Height 1 16 m 45 8 in Width 572 mm 22 5 Depth 758 mm 29 9 in Net Weight 70 3 kg
5. ailable crossovers and equalizers including items manufactured by Electro Voice FREQUENCY RESPONSE The MTL 1 s axial frequency response was measured Electro Voice s large anechoic chamber at distance of 3 meters 10 feet with a swept sine wave input Figure 1 has been averaged and corrected for 1 watt at 1 meter ENCLOSURE CONSTRUCTION Intended to be used as a portable speaker system the MTL 1 is ruggedly constructed of 3 4 inch void free plywood All joints are dado cut and the cabinet is finished with a densely woven abuse resistant carpet that is both attractive and highly durable A full length steel grille protects the woofer from damage Large heavy duty metal corner protectors firmly secured rubber feet rugged casters and recessed handles complete the picture ensuring that the MTL 1 speaker system is ideally suited for a long and reliable life on the road MTL 1 CONNECTIONS The MTL 1 is equipped with two paralleled Neutrik Speakon NL4MPR V connectors se lected for their ability to reliably deliver to the speaker components the high currents deliv ered by high wattage power amplifiers An NL4FC mating connector is supplied The NL4FC is a four pin connector and Figure 4 shows how the usual two conductor speaker cable should be wired to pins 1 and 1 of the connector Two typical connectors at the power amplifier end of the cable are shown banana and 1 4 inch phone plugs The banana plug provi
6. ch malfunction occurs curing the specified period the product will be recaired or replaced at our option without cherge The product will be returned to the customer pre paid Exclusions and Limitations Tne Lim ited Warranty does not apply to exterior finish appearance b certain spec ic items described in the individual procuct line statement s below or in the individua product data sheet or owner s manual m2 function resulting from use or operation of the product other than as specified in the procuct data sheet or owner s manual d malfurction re sulting from misuse or abuse of the e oduct or e malfunction occurring at any time after re pairs have been made to the product ty 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 Consequential Damages Excluded Product repair or replacement and return to the cus tomer the only remedies provided to the customer Electro Voice shal not be liable for any incidental or consequential damages in
7. d 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 cmarkivcompany 600 Cecil Street Buchanan Michigan 49107 MANUFACTURING PLANTS AT BUCHANAN NEWPORT TN SEVIERVILLE TN OKLAHOMA CITY OK GANANOQUE Electro Voice Inc 1995 Litho in U S A Pan Number 533091 9551 MTL 1 SPECIFICATION GRAPHICS FIGURE 1 Axial Frequency Response E M 110 SPL In dB PTT TTT TT ET E FREQUENCY IN HERTZ FIGURE 2 Harmonic Distortion 0 1 Rated Power Input 80 watts FIGURE 4 Two Conductor Cable Configurations Using Neutrik Speakon NL4FC Four Pin Connector AMZ OPO N te 2 INPUT TO Z SPEAKER SYSTEM gt 1 2 NL4FC PIN DIAGRAM 1 4 IN PHONE PLUG FIGURE 3 Dimensions 75 8 29 9 In 57 2 em 22 5 In 116 3 cm 45 8 in BANANA PLUG a4 GROUND INDICATOR 1 1
8. des the more reliable connection If it is desired to use the MTL 1 with one amplifier for each woofer remove the input panel and follow the instructions In this con figuration the upper woofer is fed through pins 1 and 1 and the lower woofer through pins 2 and 2 To find your local Neutrik dealer contact Neutrik USA Inc 195 S3 Lehigh Ave Lakewood NJ 08701 908 901 9488 SERVICE In the unlikely event the MTL 1 requires ser vice the woofers can be replaced or serviced from the front A service data sheet is available from Electro Voice POWER HANDLING TEST Electro Voice components and systems are manufactured to exacting standards ensuring they will hold up not only through the most rigorous of power tests but also through contin ued use in arduous real life conditions The EIA Loudspeaker Power Rating Full Range EIA RS 426 A 1980 uses a noise spectrum which mimics typical music and tests the ther mal and mechanical capabilities of the compo nents Electro Voice will support relevant addi tional standards as and when they become available Extreme in house power tests which push the performance boundaries of the woof ers are also performed and passed to ensure years of trouble free service Specifically the MTL 1 passes EIA RS 426 A 1980 with the following values Reg 3 45 1 15 Pimax 800 watts Test voltage 52 5 volts rms 105 0 volts peak The peak power handling capacity
9. es the long term aver age noise power rating of the speaker system For the MTL 1 this is 800 to 3 200 watts The caution cannot be made strongly enough however that this arrangement is only for experts or those who can discipline themselves against pushing the system for ever higher sound levels and who can avoid accidents such as catastrophic feed back or dropped microphones 2 conservative normal amplifier size which will produce audible results nearly equal to those of the expert recommendation is 1 0 to 1 4 times the long term average noise power rating of the speaker For the MTL 1 this is 800 to 1 120 watts 3 very conservative can use an amplifier rated at 0 5 to 0 7 times the long term average noise power rating of the loudspeaker For the MTL 1 this is 400 to 560 watts Request P A Bible Addition No Two Power Handling Capacity for more background on these recommendations SPEAKER PROTECTION Whenin the vented box mode the SubScoop like all other vented systems experiences rap idly increasing cone excursion below the box tuning frequency The acoustic output is also decreasing rapidly therefore it is sensible to protect the MTL 1 and maximize the power output of the subwoofer by inserting an active 32 Hz high pass filter with a slope of at least 12 dB per octave into the circuit Such subpassband filters are found in many com mercially av
10. this manner It is not recommended to suspend multiples of the MTL 1 vertically Vertical is defined by having the central EV logo in its correct orientation as delivered although the logo is rotatabie to allow it to remain upright in either rotation Full atten tion must be given to the instructions and limi tations in the HS kit instructions sheet ARCHITECTS AND ENGINEERS SPECIFICATIONS The loudspeaker shall be a horn loaded type The low frequencies shall be reproduced with two 400 watt EIA RS 426 A 1980 OL18MT 457 mm 18 in woofers The system will re produce the frequencies from 45 to 160 Hz The system shall be capable of producing average sound levels in excess of 129 dB in the long term and short term peaks of 135 d8 The enclosure shall be constructed of black carpeted multilayer plywood and have a metal grille which attaches with six screws The di mensions shall be 1 16 m 45 8 in tall 572 22 5 in wide and 758 mm 29 9 in deep The system shall weigh 70 3 kg 155 b Neutrik Speakon connections shall be provided The loudspeaker system shal be the Electro Voice MTL 1 UNIFORM LIMITED WARRANTY Electro Voice products are guaranteed against malfunction due to defects in materials or work manship for a specified period as noted the individual product line statement s below orin the individual product data sheet or owner s manual beginning with the date o original purchase If su
11. y by a two person crew Although the MTL 1 was designed for use with the MTH 1 system it may be used to augment the bass performance of any Electro Voice stage system USE IN MULTIPLES The MTL 1 may be used in multiples to increase acoustic output When two speaker systems are placed side by side the woofer cones mutually couple causing the two systems to act as one system with twice the effective cone area at very low frequencies giving an addi tional 3 dB increase in maximum acoustic out put Mutual coupling will occur when the frequency is such that the center to center distance be tween the two woofer manifolds is less than about one half wavelength CROSSOVER To optimize performance the MTL 1 should be used in conjunction with an active crossover with a minimum slope of 12 dB per octave and a crossover frequency in the range of 100 Hz to 160 Hz Due to the high efficiency of the MTL 1 less amplifier inputis needed to achieve a given sound output level AMPLIFIER POWER RECOMMENDATIONS As noted in the Power Handling Capacity sec tion above the MTL 1 has a random noise power capacity of 800 watts long term 3 200 watts peak per EIA RS 426 A 1980 The fol lowing guidelines will help relate this to an appropriate power amplifier output rating 1 To use the MTL 1 to full capacity skilled experts in sound system installation and opera tion will obtain the best results if the power amplifier is 2 0 to 4 0 tim
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