L-Acoustics MTD 112 Owner'S Manual Download Page 28 | Manualshive

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MTD 112

27

06/97

b) Shipping

The size of the package of an MTD 112 enclosure is:
H  = 45 cm. (17.5")
W = 47 cm. (18.5")
D  = 62 cm. (24.5")
The total shipping weight is: 26 kg(57 lb)
Warning: The package should not be exposed to water or moisture

c) Fittings

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.


Grille:  the  front  grille  is  made  of  honeycomb  perforated  1.5  mm.  thick  steel  with  epoxy
catalytic  black  finish.  The  drivers  are  further  protected  by  a  reticulated  polyurethane  foam
10 mm. thick glued in front of the grille.

The grille is fixed to the enclosure by 4 screws located just beneath the foam.

4  Fixing  nuts  are  provided,  2  on  each  top/bottom  side.  They  can  be  used  either  for
accessories fitting or for U. bracket mounting.

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Summary of Contents for MTD 112

Page 1: ...MTD 112 OWNER MANUAL ...

Page 2: ...b 4 MTD 112 p 12 3 3 STEREO F O H WITH SUB p 13 a 2 MTD 112 1 MTD 118 p 13 b 4 MTD 112 1 SB 218 p 14 3 4 3 SOURCES F O H WITH SUB p 15 3 5 3 SOURCES F O H WITHOUT SUB p 16 3 6 SIDE FILL p 17 4 1 MTD 112 ENCLOSURE p 18 a Technology p 18 b Specifications p 18 c Measured frequency responses p 18 d EASE measurements chart p 21 4 2 MTD 112 LLCa LINE LEVEL CONTROLLER p 24 a Functions p 24 b Synopsis p 2...

Page 3: ...ngs p 29 6 2 CONNECTORS CABLES W Cable length chart p 30 6 3 CONTROLLER WIRING KEY SELECTIONS W front rear drawings p 31 6 4 SOUND SYSTEM DESIGN w drawings recommendations p 32 a Passive processed p 32 b Single source p 33 c Speaker aiming p 33 d Subwoofer location p 34 6 5 PHASE CHECK p 35 7 1 MTD 112 ENCLOSURE p 36 a Periodic check p 36 b Phase check p 36 7 2 MTD 112 LLCa p 37 a Fuse p 37 b Othe...

Page 4: ...cording to the E A S E software process in order to allow accurate prediction of the system performance in installations We are confident that the information provided in this manual will be sufficient in most casesof operation Nevertheless your regional distributor or ourselves as a manufacturer do remain available to provide you some advises help or consulting services whenever you may need it I...

Page 5: ...lines whenever necessary In this respect our first design criterion is the total coherence of each individual source This criterion is fully met only with coaxial axisymmetric designs as already demonstrated years ago by a famous studio monitor British manufacturer Only this type of assembly can provide a smooth transition between the LF and HF ranges the directivity of the two transducers at the ...

Page 6: ...lance in a typical semi reverberating auditorium The experience of sound system design and installation that we have acquired throughout years of practice has extensively confirmed this and on this ground we are firmly convinced that coaxial axisymmetric loudspeakers designs are the best tools for designing a multiple sources sound system 2 2 ELEMENTS OF THE SYSTEM a The MTD 112 system comprises t...

Page 7: ...SURE is a wedge shaped wide band enclosure equipped with a 12 2 coaxial axisymmetric driver assembly It is to be operated in mono amplification with the MTD 112 LLC controller 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...

Page 8: ... 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 ...

Page 9: ...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 ...

Page 10: ...erformances and this is obviously the best situation for floor monitoring applications When more than one MTD 112 is used as floor monitor dedicated to one performer we do not recommend pointing convergingly towards the performer This typical triangular setup is inspired from the stereo Hi Fi and is irrelevant with monitoring applications Note that in most cases the signal fed into the pair of mon...

Page 11: ...tion without a subwoofer the MTD 112 should be raised above the ground to be at a correct height Stand mounting can be provided but any stable non resonant mechanical support can be considered d DELAY LINE SOUND REINFORCEMENT It often occurs that a complete coverage of an audience requires the location of loudspeakers near some areas of the audience rather than near the stage A proper sound locali...

Page 12: ...MTD 112 11 06 97 3 2 STEREO F O H WITHOUT SUB a 2 MTD 112 ...

Page 13: ...MTD 112 12 06 97 b 4 MTD 112 ...

Page 14: ...MTD 112 13 06 97 3 3 STEREO F O H WITH SUB a 2 MTD 112 1 MTD 118 ...

Page 15: ...MTD 112 14 06 97 b 4 MTD 112 1 SB 218 ...

Page 16: ...MTD 112 15 06 97 3 4 3 SOURCES F O H WITH SUB ...

Page 17: ...MTD 112 16 06 97 3 5 3 SOURCES F O H WITHOUT SUB ...

Page 18: ...MTD 112 17 06 97 3 6 SIDE FILL ...

Page 19: ...xit standard reduced to 13 8 at the output of the phase plug The voice coil is of the 3 standard and the diaphragm is made of titanium alloy There is provided a conical aluminum flare matching the internal vent of the driver magnet to achieve a smooth continuity of the wave path to the edge of the L F cone The same magnet is used for the H F and L F drivers being provided with two opposite air gap...

Page 20: ...MTD 112 19 06 97 c 2 Impedance amplitude phase response c 3 Polar response For 0 horizontal ...

Page 21: ...MTD 112 20 06 97 For 0 vertical c 4 Total harmonic distortion V 2 83V ...

Page 22: ... 0 7 1 7 0 7 0 7 1 7 1 7 2 7 1 7 1 170 6 8 6 8 6 8 6 9 6 8 6 8 7 0 6 8 6 7 6 8 180 6 6 6 6 6 7 6 6 6 6 6 5 6 5 6 4 6 5 6 5 0 10 20 30 40 50 60 70 80 90 0 0 0 0 0 0 1 0 0 0 1 0 1 0 1 0 0 0 1 0 1 10 0 1 0 1 0 2 0 1 0 1 0 0 0 1 0 2 0 1 0 1 20 0 4 0 4 0 4 0 5 0 4 0 5 0 4 0 5 0 5 0 5 30 1 1 1 1 1 2 1 1 1 1 1 3 1 1 1 0 1 1 1 1 40 2 0 2 0 1 8 2 0 1 9 1 9 2 0 1 9 2 1 1 9 50 2 9 2 9 3 0 2 9 3 0 2 9 3 0 3 1...

Page 23: ...70 14 7 15 3 15 9 16 5 17 1 17 7 18 3 19 0 19 6 21 4 180 13 9 14 0 14 0 14 1 14 1 14 2 14 3 14 3 14 4 14 3 0 10 20 30 40 50 60 70 80 90 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 10 0 8 0 8 0 8 0 9 0 9 0 9 0 8 0 9 1 0 0 9 20 2 1 2 2 2 2 2 3 2 3 2 2 2 4 2 5 2 6 2 5 30 3 9 4 0 4 0 4 1 4 0 4 2 4 3 4 2 4 3 4 1 40 5 4 5 5 5 4 5 5 5 5 5 6 5 6 5 6 5 7 5 6 50 6 8 6 9 7 0 7 1 7 3 7 4 7 5 7 4 7 7 7 7 60 8 9 ...

Page 24: ...7 24 4 170 21 7 21 8 22 0 22 3 22 1 22 4 22 5 22 8 22 7 23 1 180 21 5 21 7 21 6 21 8 22 0 22 2 22 1 22 3 22 5 22 3 0 10 20 30 40 50 60 70 80 90 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 10 0 5 0 4 0 4 0 3 0 5 0 2 0 2 0 5 0 1 0 1 20 1 1 1 0 0 9 1 1 0 8 0 7 0 7 0 8 0 5 0 6 30 2 4 2 5 2 5 2 6 2 5 2 7 2 7 2 8 2 6 2 8 40 4 9 4 8 4 9 4 9 5 0 4 7 4 7 4 8 4 7 4 7 50 7 1 7 2 7 3 7 1 7 4 7 5 7 6 7 8 7 7 7 8...

Page 25: ...g to the selected configuration in the L F range Limitation The unit takes the power amplifier in a global feedback loop using the output of the amplifier to control VCAs limiting the output of the unit The control signal is derived from the sense return path 2 limitations functions are provided cone excursion limitation for the L F driver thermal limitation for the L F and the H F drivers These f...

Page 26: ... c Specifications Overall gain 0 dB Max input level 22 dBu Input impedance 10 kΩ Noise 87dBu Maximum T H D 0 1 at 1kHz d Transfer functions Output 1 or 2 Input 10dbV SUB SUM MONO Output Input 10dbV X Over Monitor Front ...

Page 27: ...MTD 112 26 06 97 5 1 THE MTD 112 ENCLOSURE a External description 5 FEATURES ...

Page 28: ...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 Grille the front grille is made of honeycomb perforated 1 5 mm thick steel with epoxy catalytic black finish The drivers are further protected by a reticulated polyurethane foam 10 mm thick glued in front of the grille The grille is fixed to the enclo...

Page 29: ...opping like traditional T nuts often do The screws are treated against corrosion 5 2 THE MTD 112 LLCa LINE LEVEL CONTROLLER a External description b Shipping The size of the package of an MTD 112 LLCa unit is H 8 5 cm 3 W 53 cm 21 D 44 cm 17 The total shipping weight is 4 5 kg 10 lb Warning The package should not be exposed water or moisture c Unpacking When unpacking the MTD 112 LLCa controller u...

Page 30: ...s one or more power s amplifier s check that the fan operation of the amplifiers is normal and that the air path is not obstructed Whenever possible close the rear door of the rack most operational connections being on the front The power amp and the controller together in a rack become one operational unit avoiding losses of time and potential errors in connections 6 1 HARDWARE AND ACCESSORIES On...

Page 31: ...mechanical damage it is desirable to keep the loudspeaker wires as short as possible and of a gauge offering a low resistance per unit length The following chart provides the information on the minimum wire section vs length Section area Gauge Max recommanded length 8Ω 4Ω Metric mm2 Imperial Metric Imperial Metric Imperial 2 5 13 10 m 30 ft 5 m 15 ft 4 11 18 m 60 ft 9 m 30 ft 6 8 30 m 100 ft 15 m ...

Page 32: ...provides the signal to feed a power amplifier It is line level and balanced Connect the two principal outputs of the unit i e Channels 1 2 to two independent channels of a power amplifier b Front connections left to right Connect the signal input XLR balanced to the female or male socket If necessary connect the male input of the unit to the female one of another unit These two connectors M F are ...

Page 33: ...sults if unproperly set up The object of this paragraph is to help the sound system designer in his task when MTD 112 systems are to be installed simply by reminding a few features which are specific to this type of design a Passive processed The MTD 112 are practically very loud with respect to their size and are capable of covering wide audience areas There is no magic behind this The MTD 112 LL...

Page 34: ...e aimed towards the seats where the reverberating field is dominant that is the rearmost seats Off axis the listeners are nearer of the FOH loudspeaker and hence the tilt of the tonal balance due to the reverberating field nature is less important This is compensated by the attenuation of HF energy off axis i e the listeners placed near of the loudspeakers should be off the axis and still within t...

Page 35: ...rom the left and right speakers Preferably the subwoofers will be located on the floor or against a hard wall If this can be achieved one MTD 118 subwoofer per pair of MTD 112 will provide sufficient output Two SB 115 would be needed whereas one SB 218 will be sufficient for 4 MTD 112 If the difference of distance between the subwoofers and the MTD 112 at a point which is roughly in the middle of ...

Page 36: ...simply located on top of a floor standing SB 115 The configuration key selection switch on the controller will be X OVER 6 5 PHASE CHECK A phase check of every installation must be performed This shall be done with a polarity checking system like for instance the SCV PC 80 MKII This system comprises two devices a generator and a receiver The checking procedure is as follows 1 Generator a disconnec...

Page 37: ... slot and at the center of it Placing the microphone at one end of the exit slot will provide inverse results When the location of the microphone is in center the polarity must be positive polarity green LED 4 Do it again for each output of the mixing desk 7 1 MTD 112 ENCLOSURE a Periodic check The response of the enclosure should be checked periodically to prevent deviations due to wear shocks or...

Page 38: ...ar 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 In case of a fault occurring the unit shall be serviced only by an authorized agent or simply returned to the manufacturer ...

Page 39: ...MTD 112 38 06 97 7 3 MTD 112 LLCa SCHEMATICS ...

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