L-Acoustics MTD 112 Owner's Manual
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L-Acoustics MTD 112 Owner's Manual

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MTD 112
OWNER MANUAL

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Summary of Contents for L-Acoustics MTD 112

  • Page 1 MTD 112 OWNER MANUAL...

  • Page 2: Table Of Contents

    2 PRESENTATION . 2.1 THE MULTIPLE SOURCES CONCEPT . 2.2 ELEMENTS OF THE SYSTEM . a) MTD 112 ; MTD 112 LLCa ; MTD 118 ; SB 115 ; SB 218 b) HARDWARE & ACCESSORIES . 3 APPLICATIONS, CONFIGURATIONS & DIAGRAMS 3.1 APPLICATIONS .
  • Page 3 26 b) Shipping p 27 c) Fittings (built-in) p 27 d) Construction p 28 5.2 THE MTD 112 LLCa LINE-LEVEL CONTROLLER p 28 a) External description (w.drawings) . p 28 b) Shipping p 28 c) Unpacking . p 28...
  • Page 4 1 INTRODUCTION You are the owner of at least one MTD 112 sound reinforcement/monitor loudspeaker system. The present manual has been written to provide you with the information you may require to operate the MTD 112 system. Furthermore, we also have enclosed specific information relevant on how to configure the system, how to include it as a part of a global sound system design, and how to install it.

  • Page 5: The Multiple Sources Concept

    Further, the coupling of the wave generated by an axisymmetric sound source, providing a directivity smoothly increasing with frequency, with the acoustical environment of a typical auditorium is optimum: The reverberation time, typically, decreases smoothly beyond 1 kHz. MTD 112 06/97...

  • Page 6: Elements Of The System

    MTD 112 LLCa line-level controller and it can be complemented by any subwoofer of our range. For operation, the MTD 112 system must also include at least a power amplifier, cables and connectors. Although these are not necessarily supplied together with the system itself, and not necessarily from the same supplier, they must be regarded as parts of the system.
  • Page 7 MTD 112 LLCa CONTROLLER is a stereo unit providing band limiting and signal processing functions for the MTD 112 enclosure. It is to be connected in loop with one stereo amplifier. The signal inputs and the loudspeaker outputs are located on the front.
  • Page 8 THE SB 115 ENCLOSURE is a single reflex-loaded enclosure equipped with a 15" driver. It is a bass-extension enclosure. THE MTD 118 ENCLOSURE is a dual-chamber reflex loaded enclosure equipped with a 18" driver. It is a subwoofer. MTD 112 06/97...

  • Page 9: B) Hardware & Accessories

    THE SB 218 ENCLOSURE is a large format reflex loaded enclosure equipped with two 18" drivers. It is a subwoofer. b) HARDWARE & ACCESSORIES PION 1 Flying stud, Aeroquip standard ETR 1 Adjustable U.bracket for wall or scaffold mounting MTD 112 06/97...

  • Page 10: Applications, Configurations & Diagrams

    3.1 APPLICATIONS a) FLOOR MONITOR APPLICATIONS The MTD 112 system is a full range two way passive system which is to be operated only with the dedicated MTD 112 LLCa controller, connected in loop with one channel of a power amplifier.

  • Page 11: C) Side Fills

    MTD 112 LLCa controller. c) SIDE FILL APPLICATIONS The MTD 112 system can be used as a side-fill monitor, preferably with a SB 115 subwoofer enclosure. In this case, the optimum setup is to install the MTD 112 enclosure on top of the SB 115, both in a standing position.

  • Page 12: Stereo F.o.h. Without Sub

    3.2 STEREO F.O.H. WITHOUT SUB a) 2 MTD 112 MTD 112 06/97...

  • Page 13: B) 4 Mtd 112

    4 MTD 112 MTD 112 06/97...

  • Page 14: Stereo F.o.h. With Sub

    3.3 STEREO F.O.H. WITH SUB a) 2 MTD 112 + 1 MTD 118 MTD 112 06/97...

  • Page 15: B) 4 Mtd 112 + 1 Sb 218

    4 MTD 112 + 1 SB 218 MTD 112 06/97...

  • Page 16: Sources F.o.h. With Sub

    3.4 3 SOURCES F.O.H. WITH SUB MTD 112 06/97...

  • Page 17: Sources F.o.h. Without Sub

    3.5 3 SOURCES F.O.H. WITHOUT SUB MTD 112 06/97...

  • Page 18: Side Fill

    3.6 SIDE FILL MTD 112 06/97...

  • Page 19: Technology & Specifications

    4.1 THE MTD 112 ENCLOSURE a) Technology The technology of the MTD 112 is based on the two-way dual concentric type. The flare of the L.F. cone loads directly the H.F. compression driver, hence allowing a true coaxial axisymmetry of the wavefront generated both by the L.F. and H.F. drivers.(This is not the case when a small horn is fitted inside the L.F.
  • Page 20 : Impedance amplitude & phase response c-3 : Polar response - For 0° horizontal MTD 112 06/97...
  • Page 21 - For 0° vertical c-4 : Total harmonic distortion (V = 2.83V) MTD 112 06/97...

  • Page 22: D) Ease Measurements Chart

    130° 140° 11,8 12,1 12,4 12,8 13,1 13,4 13,8 14,1 14,4 14,4 150° 11,9 12,1 12,3 12,5 12,7 12,9 13,2 13,4 13,6 13,8 11,0 11,1 11,1 11,3 11,3 11,2 11,4 11,5 11,6 11,7 160° 10,0 170° 180° MTD 112 06/97...
  • Page 23 21,4 21,8 22,1 150° 160° 19,0 19,7 20,4 22,1 21,7 22,4 23,0 23,7 25,1 24,4 170° 20,6 21,1 21,6 22,7 22,2 23,2 23,8 24,3 24,8 25,0 25,2 25,4 25,6 26,1 25,9 26,4 26,6 27,1 26,9 27,0 180° MTD 112 06/97...
  • Page 24 30,6 30,8 30,7 150° 160° 26,6 26,9 27,1 27,3 27,6 28,0 27,8 28,3 28,5 28,8 170° 24,3 24,6 25,1 24,9 25,4 25,6 25,9 26,4 26,1 26,4 23,5 23,8 23,7 23,9 24,2 24,1 24,4 24,5 24,7 24,8 180° MTD 112 06/97...

  • Page 25: A) Functions

    These functions are carefully adjusted for minimum audible effect and thorough driver protection. * Mono summation: The inputs of two MTD 112 LLCa controllers are summed to derive a mono signal capable of driving a central source. This mono signal can be the simple sum of the inputs, for driving a central broad-band source, or can be filtered for driving a central subwoofer.

  • Page 26: C) Specifications

    Input impedance : 10 kΩ Noise : <-87dBu Maximum T.H.D. : 0.1% at 1kHz d) Transfer functions * Output 1 or 2 (Input = -10dbV) Front Monitor X-Over * SUB + SUM MONO Output (Input = -10dbV) MTD 112 06/97...

  • Page 27: The Mtd 112 Enclosure

    5. FEATURES 5.1 THE MTD 112 ENCLOSURE a) External description MTD 112 06/97...

  • Page 28: B) Shipping

    3 Aeroquip type fixing posts are provided for rigging; two being located symmetrically on the top and the bottom of the MTD 112 cabinet, one being located at the back of the cabinet. The Standard Aeroquip stud with locking pin for connecting to the fixing post is under our reference PION 1.

  • Page 29: D) Construction

    Warning: The package should not be exposed water or moisture c) Unpacking When unpacking the MTD 112 LLCa controller unit, take care of not tearing the plastic sleeve which can be useful for eventual re-packing. Do not drop the unit when unpacked.

  • Page 30: D) Rack Mounting

    Rack mounting The MTD 112 LLCa controller unit should be rack mounted. It requires 1 U rack space. For mounting in a rack, use 4 screws with plastic spacers in order not to damage the front panel finish. The weight of the unit being low, no rear clamping is required.

  • Page 31: Connectors/Cables (W.cable Length Chart.)

    6.2 CONNECTORS & CABLES a) MTD 112 :The connectors at both ends of the 2 conductors cables for connecting the MTD 112 are of the 4 pins Speakon type. Two Speakon sockets are provided on the front panel of the MTD 112 LLCa controller, one per channel.

  • Page 32: Controller Wiring & Key Selections (W.front & Rear Drawings)

    If necessary, connect the male input of the unit to the female one of another unit. These two connectors (M & F) are in parallel. The first key is to select the configuration of the MTD 112. MONITOR provides a frequency response which is best matched to floor-monitor applications.

  • Page 33: Sound System Design (W.drawings & Recommendations)

    This means that there is no need to keep a safety margin, when using the MTD 112. Even an inexperienced user can use the MTD 112 system at its full potential without risk.

  • Page 34: C) Speaker Aiming

    In a multi-source configuration, simply replace the term "rearmost seat" by the term "seats which are the furthest away from the loudspeaker allotted to cover this part of the audience area". It really works. MTD 112 06/97...

  • Page 35: D) Subwoofer Location

    To summarize, the MTD 112 should be aimed at the rear of the part of the audience they are to cover, unlike constant directivity designs which are typically aimed at the center of the audience part they are to cover.

  • Page 36: Phase Check

    - Side-Fill applications For side-fill applications, the MTD 112 will be simply located on top of a floor-standing SB 115. The configuration key selection switch on the controller will be "X.OVER".

  • Page 37: Maintainance & Miscellanneous

    (positive polarity) 3 Loudspeakers a) MTD 112 enclosure : Place the microphone near the center of the loudspeaker, at the distance comprised between 5 cm and 50 cm. The green LED must be lightened at every « Plop », showing that the polarity is positive.

  • Page 38: Mtd 112 Llca

    7.2 MTD 112 LLCa a) Fuse The fuse can be changed or verified directly from the rear panel of the unit (see drawing). When operated under 220/240 volts mains supply, the proper fuse value is 200 mA b) Other internal No user adjustment is provided inside the unit.

  • Page 39: Mtd 112 Llca Schematics

    7.3 MTD 112 LLCa SCHEMATICS MTD 112 06/97...

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