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L-ACOUSTICS MTD Manual V1.2

11/30/2004

6. INSTALLATION PROCEDURES .......................................................................................................51

6.1 ETR8 U-BRACKET ATTACHMENT(MTD108a) ........................................................................................... 51

6.2 ETR1, ETR2 U-BRACKET ATTACHMENT (MTD112b, MTD115b) ...............................................................52
6.3 OMNIMOUNT BRACKET ATTACHMENT (MTD112b, MTD115b) ..............................................................53
6.4 SAFETY RULES ........................................................................................................................................... 53

7. MTD SYSTEM OPERATION..............................................................................................................54

7.1 RECOMMENDED MAINTENANCE PROCEDURES ..................................................................................... 54

7.2 SPARE PARTS.............................................................................................................................................. 55

8. SPECIFICATIONS ..............................................................................................................................56

8.1 MTD108a SPECIFICATIONS ....................................................................................................................... 56

8.2 MTD108LLCa SPECIFICATIONS ................................................................................................................. 59

8.3 MTD112b SPECIFICATIONS....................................................................................................................... 60

8.4 LLC112b-st SPECIFICATIONS ..................................................................................................................... 63

8.5 MTD115b SPECIFICATIONS....................................................................................................................... 64

8.6 LLC115b-st, LLC115b-2w SPECIFICATIONS................................................................................................ 67

LIST OF FIGURES

Figure 1: MTD System Components........................................................................................................9

Figure 2: MTD LLC Controllers .............................................................................................................11

Figure 3: MTD108a passive 2-way (8” LF + 1” HF) coaxial loudspeaker..............................................13

Figure 4: MTD112b passive 2-way (12” LF + 1.4” HF) coaxial loudspeaker ........................................14

Figure 5: MTD115b active/passive 2-way (15” LF + 1.4” HF) coaxial loudspeaker ..............................15

Figure 6: MLS switches on the rear panel of L-ACOUSTICS LA24a, LA48a amplifiers.........................16

Figure 7a: MTD108a Floor Monitor System Block Diagram ..................................................................27

Figure 7b: MTD108a Floor Monitor System Cabling Detail...................................................................27

Figure 8a: MTD108a FOH System Block Diagram (mono subwoofers) ................................................28

Figure 8b: MTD108a FOH System Cabling Detail (mono subwoofers).................................................28

Figure 9a: MTD108a FOH System Block Diagram (stereo subwoofers) ...............................................29

Figure 9b: MTD108a FOH System Cabling Detail (stereo subwoofers)................................................29

Figure 10a: MTD112b Floor Monitor System Block Diagram................................................................30

Figure 10b: MTD112b Floor Monitor System Cabling Detail ................................................................30

Figure 11a: MTD112b FOH System Block Diagram (mono subwoofers)..............................................31

Figure 11b: MTD112b FOH System Cabling Detail (mono subwoofers) ..............................................31

Figure 12a: MTD112b FOH System Block Diagram (stereo subwoofers).............................................32

Figure 12b: MTD112b FOH System Cabling Detail (stereo subwoofers) ............................................32

Figure 13a: MTD115b (passive) Floor Monitor System Block Diagram.................................................33

Figure 13b: MTD115b (passive) Floor Monitor System Cabling Detail .................................................33

Figure 14a: MTD115b (passive) FOH System Block Diagram (mono subwoofers) ..............................34

Figure 14b: MTD115b (passive) FOH System Cabling Detail (mono subwoofers) ...............................34

Figure 15a: MTD115b (passive) FOH System Block Diagram (stereo subwoofers)..............................35

Figure 15b: MTD112b (passive) FOH System Cabling Detail (stereo subwoofers) ..............................35

Figure 16a: MTD115b (active) Floor Monitor System Block Diagram...................................................36

Figure 16b: MTD115b (active) Floor Monitor System Cabling Detail ...................................................36

Figure 17a: MTD115b (active) FOH System Block Diagram (mono subwoofers).................................37

Figure 17b: MTD115b (active) FOH System Cabling Detail (mono subwoofers) ................................37

Figure 18a: MTD115b (active) FOH System Block Diagram (stereo subwoofers)................................38

Figure 18b: MTD112b (active) FOH System Cabling Detail (stereo subwoofers)................................38

Figure 19: General guidelines for aiming MTD enclosures.....................................................................40

Figure 20: SPL mappings at octave band frequencies for a single MTD enclosure ................................40

Figure 21: SPL mappings for two MTD enclosures with 0.5 metre spacing ..........................................41

Figure 22: SPL mappings for two MTD enclosures with 3 metre spacing .............................................41

Figure 23: General guidelines for arraying MTD enclosures. .................................................................42

Содержание MTD Series

Страница 1: ...Version 1 2 December 2004 L ACOUSTICS MTD LINE MTD108a MTD112b MTD115b OPERATOR MANUAL ...

Страница 2: ...most applications however should you require further assistance your distributor or L ACOUSTICS are available to provide additional technical support MANUAL ORGANIZATION The Introduction gives a brief presentation of coaxial technology and the MTD line Chapter 1 introduces MTD108a MTD112b MTD115b loudspeaker enclosures plus accessories Chapter 2 discusses MTD power amplification and cabling Chapte...

Страница 3: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 2 ...

Страница 4: ...STEM MONO SUBS 28 4 3 MTD108a FOH SYSTEM STEREO SUBS 29 4 4 MTD112b FLOOR MONITOR SYSTEM 30 4 5 MTD112b FOH SYSTEM MONO SUB 31 4 6 MTD112b FOH SYSTEM STEREO SUBS 32 4 7 MTD115b PASSIVE FLOOR MONITOR SYSTEM 33 4 8 MTD115b PASSIVE FOH SYSTEM MONO SUB 34 4 9 MTD115b PASSIVE FOH SYSTEM STEREO SUBS 35 4 10 MTD115b ACTIVE FLOOR MONITOR SYSTEM 36 4 11 MTD115b ACTIVE FOH SYSTEM STEREO SB118 SUBS 37 4 12 M...

Страница 5: ...ystem Block Diagram 30 Figure 10b MTD112b Floor Monitor System Cabling Detail 30 Figure 11a MTD112b FOH System Block Diagram mono subwoofers 31 Figure 11b MTD112b FOH System Cabling Detail mono subwoofers 31 Figure 12a MTD112b FOH System Block Diagram stereo subwoofers 32 Figure 12b MTD112b FOH System Cabling Detail stereo subwoofers 32 Figure 13a MTD115b passive Floor Monitor System Block Diagram...

Страница 6: ... Table 4 Load and Power Ratings for MTD112b 18 Table 5 Recommended power amplification and MLS switch settings for MTD112b 18 Table 6 Recommended MLS switch settings for powering MTD112b 18 Table 7 Load and Power Ratings for MTD115b passive mode 19 Table 8 Recommended power amplification MLS switch settings for MTD115b passive mode 19 Table 9 Recommended MLS switch settings for powering MTD115b pa...

Страница 7: ...an enclosure design that cannot be used in single or very small configurations A different set of loudspeaker enclosure design specifications apply that are more suited to the multiple source sound design approach The L ACOUSTICS approach to distributed sound reinforcement using multiple sound sources starts with the specification that each individual loudspeaker enclosure should behave as a total...

Страница 8: ...r enclosures with their respective analog line level controllers MTD108 LLC LLC112b st LLC115b st or LLC115b 2w MTD rigging accessories and SB115 SB118 or SB218 subwoofers Please note that amplifier racks plus loudspeaker cables are not specified but should meet the minimum specification requirements outlined below 1 1 MTD SYSTEM COMPONENTS LOUDSPEAKER ENCLOSURES 1 MTD108a Passive 2 way coaxial lo...

Страница 9: ...ientations 11 ETR 1 Adjustable U Bracket for ceiling wall or scaffold mounting of the MTD112b vertical orientation only 11 ETR 2 Adjustable U Bracket for ceiling wall or scaffold mounting of the MTD115b or SB115subwoofer vertical orientation only 12 PION 1 Single stud Aeroquip flytrack fitting to ring for use as a safety attachment in conjunction with MTD112b and ETR1 or MTD115b and ETR2 LOUDSPEAK...

Страница 10: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 9 MTD112b ETR1 MTD115b ETR2 for MTD115b or SB115 PION1 F CABLE DO7 F LINK CABLE DO 7 Figure 1 MTD System Components ...

Страница 11: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 10 MTD108 LLCa front MTD108 LLCa rear LLC112b st front LLC112b st rear ...

Страница 12: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 11 LLC115b st front LLC115b st rear LLC115b 2w front LLC115b 2w rear Figure 2 MTD LLC Controllers ...

Страница 13: ...use FOH applications for theatres clubs multi purpose venues or corporate events Examples of distributed systems include delay rings for large scale installations surround effects channels for theatre or multimedia distributed reinforcement for sports venues and delays for speech reinforcement in convention centre ballrooms Due to their compact wedge shaped format axi symmetrical directivity and f...

Страница 14: ...y horizontally and diagonally symmetrical i e axi symmetric As implemented in the passive crossover network the crossover point between low and high sections is 2 kHz Long term power handling capacity is 250 Wrms at a nominal 8 ohm impedance and connection to the loudspeaker is made via two parallel 4 pin Neutrik Speakon connectors For floor monitoring the MTD108a has either 22 5 or 45 listening a...

Страница 15: ...re weight is 26 5 kg 58 4 lbs and cabinet construction consists of 18 mm 0 70 in and 30 mm 1 18 in Baltic birch plywood with internal steel bracing and joints that are sealed screwed and rabbeted The finish is maroon gray high resilient paint and the front of the enclosure is protected by a black powder coated 1 5 mm 0 06 in thick steel grill that is covered with 10 mm 0 4 in thick acoustically tr...

Страница 16: ... 16 7 cm 6 6 in wide at the rear and 47 5 cm 18 7 in deep Enclosure weight is 32 5 kg 71 6 lbs and cabinet construction consists of 18 mm 0 70 in and 30 mm 1 18 in Baltic birch plywood with internal steel bracing and joints that are sealed screwed and rabbeted The finish is maroon gray high resilient paint and the front of the enclosure is protected by a black powder coated 1 5 mm 0 06 in thick st...

Страница 17: ...han 32 dB gain please contact your amplifier supplier for technical support regarding how to calibrate the amplifier for 32 dB gain LIMITERS Peak limiters on all amplifier outputs with soft clipping characteristics attack time less than 3msec COOLING Temperature speed controlled fan recommended In practice L ACOUSTICS specifies power amplifiers with output power equivalent to twice the RMS power h...

Страница 18: ...L ACOUSTICS LA power amplifier specifications and MLS switch settings are summarized in Table 2 Boldface settings indicate a good power match based on the recommended power amplifier specification Table 2 Recommended power amplification and MLS switch settings for MTD108a RECOMMENDED AMPLIFIER OUTPUT POWER POWER AMP MLS SETTING LOAD POWER LA15a LA 17a LA 24a LA 48a ohms W 2 2000 do not use 1200 17...

Страница 19: ...L ACOUSTICS LA power amplifier specifications and MLS switch settings are summarized in Table 5 Boldface settings indicate a good power match based on the recommended power amplifier specification Table 5 Recommended power amplification and MLS switch settings for MTD112b RECOMMENDED AMPLIFIER OUTPUT POWER POWER AMP MLS SETTING LOAD POWER LA15a LA 17a LA 24a LA 48a ohms W 2 2000 do not use 1200 17...

Страница 20: ... specifications recommended L ACOUSTICS LA power amplifier specifications and MLS switch settings are summarized in Table 8 Boldface settings indicate a good power match based on the recommended power amplifier specification Table 8 Recommended power amplification and MLS switch settings for MTD115b passive mode RECOMMENDED AMPLIFIER OUTPUT POWER POWER AMP MLS SETTING LOAD POWER LA15a LA 17a LA 24...

Страница 21: ...b ACTIVE TWO MTD115b ACTIVE THREE MTD115b ACTIVE FOUR MTD115b ACTIVE SECTIO LOAD RMS PEAK REC D LOAD RMS PEAK REC D LOAD RMS PEAK REC D LOAD RMS PEAK REC D LOW 8 265 1060 530 4 530 2120 1060 2 7 795 3180 1590 2 1060 4240 2120 HIGH 8 150 600 600 4 300 1200 1200 2 7 440 1760 1760 2 600 2400 2400 Based on these specifications recommended L ACOUSTICS LA power amplifier specifications and MLS switch se...

Страница 22: ... use 1200 1700 2400 0 dB 0 dB 2 dB 2 7 1760 do not use 1080 1635 1665 0 dB 0 dB 4 dB 4 1200 600 840 1300 1000 0 dB 0 dB 2 dB 4 dB 8 600 370 430 700 520 0 dB 0 dB 2 dB 4 dB MLS switch settings for powering the MTD115b in active mode are summarized in Table 13 Table 13 Recommended MLS switch settings for powering MTD115b active mode MTD115b ACTIVE MLS SETTING LA15a LA17a LA24a LA48a MTD115b LO SECTI...

Страница 23: ... 870 1200 L ACOUSTICS LA 24a POWER MATRIX L ACOUSTICS LA 48a POWER MATRIX MLS SWITCH SETTING MLS SWITCH SETTING LOAD CONFIGURATION 5 dB 4 dB 2 dB 0 dB LOAD CONFIGURATION 5 dB 4 dB 2 dB 0 dB 16 ohms Stereo 2 channel 160 200 340 520 16 ohms Stereo 2 channel 220 260 410 650 8 ohms Stereo 2 channel 300 400 700 1100 8 ohms Stereo 2 channel 430 520 820 1300 4 ohms Stereo 2 channel 600 750 1300 1500 4 oh...

Страница 24: ...result in mechanical damage it is desirable to keep loudspeaker cables as short as possible and with a gauge offering low resistance per unit length The following chart provides information regarding the minimum wire cross section versus length Table 15 Maximum Recommended Length for Damping Factor 20 Cross Section Gauge 8 ohms 4 ohms Metric mm2 Imperial Metric Imperial Metric Imperial 2 5 13 30 m...

Страница 25: ... or SB218 are selectable via internal jumpers Alternatively the summed MONO signal output can be used to feed a power amplifier allotted to a central fullrange fill loudspeaker SUM mode The MTD108LLCa is connected in series with two amplifier channels for sense return processing i e amplifier outputs are connected to the Sense Return input of the MTD108LLCa Protection circuitry monitors the signal...

Страница 26: ...ive input channels plus a filtered summed output for subwoofer drive The LLC 115b 2w is for mono operation of active MTD115b enclosures and accepts a single signal input while providing processed outputs for the subwoofer low and high frequency channels The main functions of the LLC 115b st and LLC 115b 2w controllers are as follows Bandpass filtering and equalization 3 modes selectable Crossover ...

Страница 27: ... to power amplifier input channels with the amplifier outputs then connected to the controller Sense Return input speakon connector LF 1 1 HF 2 2 As for the LLC 115b st protection circuitry monitors the signal applied to the loudspeakers to provide thermal protection of speaker components plus voltage and frequency dependent cone excursion limiting provided that the power amplifier has 32 dB gain ...

Страница 28: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 27 4 1 MTD108a FLOOR MONITOR SYSTEM Figure 7a MTD108a Floor Monitor System Block Diagram Figure 7b MTD108a Floor Monitor System Cabling Detail ...

Страница 29: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 28 4 2 MTD108a FOH SYSTEM MONO SUBS Figure 8a MTD108a FOH System Block Diagram mono subwoofers Figure 8b MTD108a FOH System Cabling Detail mono subwoofers ...

Страница 30: ... 2004 29 4 3 MTD108a FOH SYSTEM STEREO SUBS Figure 9a MTD108a FOH System Block Diagram stereo subwoofers note LLC ChA to ChB link provides 6 dB increase for subwoofer drive Figure 9b MTD108a FOH System Cabling Detail stereo subwoofers ...

Страница 31: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 30 4 4 MTD112b FLOOR MONITOR SYSTEM Figure 10a MTD112b Floor Monitor System Block Diagram Figure 10b MTD112b Floor Monitor System Cabling Detail ...

Страница 32: ...L ACOUSTICS MTD Manual V1 2 11 30 2004 31 4 5 MTD112b FOH SYSTEM MONO SUB Figure 11a MTD112b FOH System Block Diagram mono subwoofers Figure 11b MTD112b FOH System Cabling Detail mono subs ...

Страница 33: ...2004 32 4 6 MTD112b FOH SYSTEM STEREO SUBS Figure 12a MTD112b FOH System Block Diagram stereo subwoofers note LLC ChA to ChB link provides 6 dB increase for subwoofer drive Figure 12b MTD112b FOH System Cabling Detail stereo subwoofers ...

Страница 34: ...COUSTICS MTD Manual V1 2 11 30 2004 33 4 7 MTD115b PASSIVE FLOOR MONITOR SYSTEM Figure 13a MTD115b passive Floor Monitor System Block Diagram Figure 13b MTD115b passive Floor Monitor System Cabling Detail ...

Страница 35: ...ACOUSTICS MTD Manual V1 2 11 30 2004 34 4 8 MTD115b PASSIVE FOH SYSTEM MONO SUB Figure 14a MTD115b passive FOH System Block Diagram mono subs Figure 14b MTD115b passive FOH System Cabling Detail mono subs ...

Страница 36: ...5 4 9 MTD115b PASSIVE FOH SYSTEM STEREO SUBS Figure 15a MTD115b passive FOH System Block Diagram stereo subs note LLC ChA to ChB link provides 6 dB increase for subwoofer drive Figure 15b MTD115b passive FOH System Cabling Detail stereo subs ...

Страница 37: ...ACOUSTICS MTD Manual V1 2 11 30 2004 36 4 10 MTD115b ACTIVE FLOOR MONITOR SYSTEM Figure 16a MTD115b active Floor Monitor System Block Diagram Figure 16b MTD115b active Floor Monitor System Cabling Detail ...

Страница 38: ...CS MTD Manual V1 2 11 30 2004 37 4 11 MTD115b ACTIVE FOH SYSTEM STEREO SB118 SUBS Figure 17a MTD115b active FOH System Block Diagram stereo SB118 Figure 17b MTD115b active FOH System Cabling Detail stereo SB118 ...

Страница 39: ...CS MTD Manual V1 2 11 30 2004 38 4 12 MTD115b ACTIVE FOH SYSTEM STEREO SB218 SUBS Figure 18a MTD115b active FOH System Block Diagram stereo SB218 Figure 18b MTD115b active FOH System Cabling Detail stereo SB218 ...

Страница 40: ...monitoring applications 5 2 AIMING MTD ENCLOSURES Due to their controlled directivity behavior MTD enclosures should be aimed so as to geometrically cover the desired audience area with the main zero degree axis roughly orientated towards the middle or rear of the audience area Since the wavefront radiated by an axi symmetric sound source has directivity that is smoothly increasing with frequency ...

Страница 41: ...sing coaxial technology Note For color versions of figures 20 21 22 and 24 please see the MTD manual PDF file that is available for download from www l acoustics com 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz Figure 20 SPL mappings at octave band frequencies for a single MTD enclosure Figure 21 shows SPL mappings at octave band frequencies for two MTD enclosures with a spacing of 0 5 meters Uneven cov...

Страница 42: ...ing of 3 meters Interference now occurs lower in frequency and tends to be masked by room reverberation Compared with the closely spaced arrayed system of Fig 21 there is now improved intelligibility at higher frequencies Essentially the key to successful distributed system design is reducing the effects of audible interference 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz Figure 22 SPL mappings at octav...

Страница 43: ...id case corresponds to the SPL mappings shown in Figure 24 works corresponds to Figure 21 and best corresponds to Figure 22 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz Figure 24 SPL mappings at octave band frequencies for four MTD enclosures with 0 5 metre spacing arrayed system corresponding to the avoid case shown in Figure 23 ...

Страница 44: ...uted Sound Systems in Sound System Engineering for complete details 5 5 2 DELAY SYSTEMS MTD enclosures are highly suited for delay system installation in order to cover large audience areas When installing delay systems there are a few principles that should be followed 1 Over delaying up to 15 ms is acceptable due to the Haas effect Greater than 15 ms is not acceptable since the delayed sound wil...

Страница 45: ...closures can be stacked on top of a central line array of subwoofers or any other object of suitable height provided that the height of the HF section is appropriate for audience coverage Typically a stacked height of at least 1 2 meters is recommended in order to reduce audience shadowing effects and whether the audience is seated or standing should be considered In addition to these issues sight...

Страница 46: ...ONS When MTD018a MTD112b or MTD115b enclosures are used standalone without subwoofers for FOH applications there are three different types of LLC processing available 1 FRONT mode has approximately 3 dB of low frequency shelving equalization in order to provide a frequency response contour that is suitable for music applications 2 MONITOR mode has a reduced amount of low frequency shelving equaliz...

Страница 47: ...ributed front fill systems i e the optimum spacing between floor monitors will depend on the coverage angle of the enclosure 100 85 and 85 degrees for MTD108a MTD112b and MTD115b respectively and the throw distance to the performing artist which is determined by the floor monitor angle with respect to vertical and the artist s height Center to center overlap will provide the most uniform coverage ...

Страница 48: ...in 175 5 ft 9 in 175 5 ft 9 in 209 6 ft 10 in 180 5 ft 11 in 180 5 ft 11 in 215 7 ft 0 in 185 6 ft 1 in 185 6 ft 1 in 220 7 ft 3 in 190 6 ft 3 in 190 6 ft 3 in 226 7 ft 5 in MTD112b 45 angle wrt vertical 85 deg coverage PERFORMER HEIGHT Performer Monitor Monitor Monitor cm ft in cm ft in cm ft in 160 5 ft 3 in 160 5 ft 3 in 147 4 ft 10 in 165 5 ft 5 in 165 5 ft 5 in 151 4 ft 12 in 170 5 ft 7 in 17...

Страница 49: ...108LLCa analog controller the subwoofer model is selected by changing a jumper on the circuit board inside the unit please see Section 5 6 for further details 5 8 USING MTD WITH SUBWOOFERS For extended bandwidth sound reinforcement MTD108a MTD112b or MTD115b enclosures should be used with SB115 SB118 SB218 or dV SUB subwoofers As a quick reference L ACOUSTICS subwoofer specifications are summarize...

Страница 50: ...as a low frequency extension and are driven with the same signal as the MTD enclosure Note An additional LLC controller will be required to drive subwoofers separately via auxiliary send In general X OVER mode for all LLC controllers provides a 100 Hz 24 dB octave Linkwitz Riley LR24 low pass filter for the subwoofers with a complimentary 100 Hz LR24 high pass filter for the MTD112b or MTD115b low...

Страница 51: ... be required for subwoofer time alignment In most cases LLC controllers should be used in X OVER mode for flown MTD and ground stacked subwoofer configurations in 3 way mode or with separate AUX drive for the subwoofers since the subwoofers can be used with positive polarity and this helps to simplify installation and system tuning However if more low frequency energy is desired from the flown MTD...

Страница 52: ...MTD108a pole mount socket 4 Remove recessed set screw 5 Rotate pivoting arm into position select angle 6 Secure the locking pin on the pivoting arm 7 Three attachment points are available for ceiling or scaffold mounting in the horizontal orientation 8 Always install with the fixed arm on the bottom when installing the MTD108a in the vertical orientation Figure 27 ETR8 U bracket installation proce...

Страница 53: ...rientation for alignment of enclosure centre of gravity 6 Mirror image for the other side of the enclosure 7 Remove ETR1 attachment knob and lock washer 8 Attach ETR1 on both sides of the enclosure 9 The smaller knob allows for tilt angle adjustment 10 Three attachment points available for ceiling or scaffold mounting in the horizontal orientation only Single stud plate available for safety attach...

Страница 54: ...t installation procedure 6 4 SAFETY RULES When using ETR8 for mounting the MTD108a enclosure in the vertical orientation always install the U bracket with the fixed arm on the bottom and the pivoting arm on top ETR1 and ETR2 are for installation of MTD112b or MTD115b enclosures respectively in the horizontal orientation only L ACOUSTICS recommends the use of safety steels at all times The integrat...

Страница 55: ... amps on last amps off first in order to avoid component damage due to power on off transients 7 1 RECOMMENDED MAINTENANCE PROCEDURES a HF diaphragm replacement To access the HF compression driver diaphragm the front grille of the MTD enclosure should be removed and the entire 8 12 or 15 coaxial assembly de mounted To remove the front grille lift the edges of the acoustic foam and remove the screw...

Страница 56: ... real time analyzer or preferably using WINMLS SMAART SPECTRAFOO TEF or MLSSA measurement systems Refer to the on axis amplitude frequency response to determine if your MTD enclosure is within specification In addition a response sweep using a sine wave generator is useful for checking for coil rubs buzzes air leaks or other undesirable mechanical vibrations as part of the periodic quality control...

Страница 57: ...g preset equalization and band levelling adjustment as measured under freefield conditions FRONT LLC setting provides a 3 dB low frequency contour under freefield conditions XOVER LLC setting applies a 125 Hz high pass filter Components LF 1 x 8 weather resistant loudspeaker 2 voice coil HF 1 x 1 exit neodymium compression driver titanium diaphragm coaxial assembly Enclosure Height 421 mm 16 6 in ...

Страница 58: ...L ACOUSTICS MTD Manual V1 2 30 11 04 57 Figure 30 MTD108a line drawing ...

Страница 59: ...L ACOUSTICS MTD Manual V1 2 30 11 04 58 Figure 31 MTD108a plus ETR8 line drawings ...

Страница 60: ... limiter Front Rear Panel Indicators Signal green LED for each section Control yellow LED for each section Front Panel Controls AC power MODE select SUB SUM select Rear Panel Control IN PHASE OUT PHASE MONO output polarity Front Panel Connectors Channel 1 2 XLR inputs parallel loop through Loudspeaker 2x 4 pin Neutrik speakon Rear Panel Connectors Sense Return 4 pin Neutrik speakon MONO Channel 1 ...

Страница 61: ...nd levelling adjustment as measured under freefield conditions FRONT LLC setting provides a 3 dB low frequency contour under freefield conditions XOVER LLC setting applies a 100 Hz high pass filter Components LF 1 x 12 weather resistant loudspeaker 4 voice coil HF 1 x 1 4 exit compression driver titanium diaphragm 3 voice coil coaxial assembly Enclosure Height 540 mm 21 3 in Front Width 410 mm 16 ...

Страница 62: ...L ACOUSTICS MTD Manual V1 2 30 11 04 61 Figure 32 MTD112b line drawing ...

Страница 63: ...L ACOUSTICS MTD Manual V1 2 30 11 04 62 Figure 33 MTD112b plus ETR1 line drawings ...

Страница 64: ...LED for each channel Control yellow LED for each channel Front Panel Controls MODE select FRONT MONITOR X OVER SUB select SB115 SB118 SB218 AC power switch Rear Panel Control SUB POLARITY positive negative Front Panel Connectors Ch A B XLR inputs with parallel loop through MONO SUB XLR output in parallel with rear panel XLR LOUDSPEAKERS OUT Ch A B 2 x 4 pin Neutrik speakon Rear Panel Connectors Ch...

Страница 65: ...e System output gives the unweighted SPL output of the system referenced to 1 m including preset equalization and band levelling adjustment as measured under freefield conditions FRONT LLC setting provides a 3 dB low frequency contour under freefield conditions XOVER LLC setting applies a 100 Hz high pass filter Components LF 1 x 15 weather resistant loudspeaker 3 voice coil HF 1 x 1 4 exit compre...

Страница 66: ...L ACOUSTICS MTD Manual V1 2 30 11 04 65 Figure 34 MTD115b line drawing ...

Страница 67: ...L ACOUSTICS MTD Manual V1 2 30 11 04 66 Figure 35 MTD115b plus ETR2 line drawings ...

Страница 68: ...LPF Crossover Filter 1 2 kHz 24 dB octave slope LLC 115 2w Speaker Protection RMS limiter peak limiter LLC 115 st LF Section RMS limiter peak limiter LLC 115 2w HF Section RMS limiter LLC 115 2w Front Rear Panel Indicators Signal green LED for each channel Control yellow LED for each channel Front Panel Controls MODE select FRONT MONITOR X OVER SUB select SB115 SB118 SB218 AC power switch Rear Pan...

Страница 69: ...LF HF XLR line outputs LLC 115b 2w MONO SUB XLR output in parallel with front panel XLR Sense Return 1x 4 pin Neutrik speakon LF 1 1 HF 2 2 Power Requirement 100 V 240 V 50 60 Hz Power Consumption 15 W Physical Finish Black anodized front panel white serigraphy Net Dimensions 483 x 44 x 305 mm 19 x 1 75 x 12 0 in Shipping Dimensions 505 x 80 x 415 mm 19 9 x 3 1 x 16 3 in Net Weight 3 7 kg 8 2 lbs ...

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