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MA2.0 High Performance Amplifier User Guide The Martin Experience All material © 2010. Martin Audio Ltd. Subject to change without notice. Contents Warning g notices s ............................................................................................... 3 1 Insta allation and a operration ..... ..................................................................... 6 1.1 1.2 1.3 1.4 1.5 1.6 Unp packing ................... ................................................ .............................. 6 Mou unting ..................... ................................................ .............................. 6 Ope erating Pre ecautions s ............................................... .............................. 7 AC Main connection ... ................................................ .............................. 7 Con nnecting Inputs ...... ................................................ .............................. 8 Con nnecting Outputs O ... ................................................ .............................. 9 2 Setu up and se ettings ................................................................................... 10 2.1 2.2 Intrroduction ................ ................................................ ............................ 10 The e LED indicators ..... ................................................ ............................ 11 3 Prote ection................................................................................................... 12 3.2 3.3 3.4 Sho ort circuit protection n .............................................. ............................ 12 The ermal protection ..... ................................................ ............................ 12 DC fault prote ection ..... ................................................ ............................ 12 4 Userr Mainten nance..................................................................................... 13 4.1 4.2 4.3 Clea aning ...................... ................................................ ............................ 13 3 Serv rvice......................... ................................................ ............................ 13 3 Dus st removal ............... ................................................ ............................ 13 3 5 Warrranty ..................................................................................................... 14 4 7 Tech hnical no otes ........................................................................................ 15 5 7.1 7.2 7.3 7.4 Block diagram m ............. ................................................ ............................ 15 5 ermal Diss sipation ... ................................................ ............................ 16 6 The Spe ecification n ............... ................................................ ............................ 17 7 Tec chnical Dra awing ...... ................................................ ............................ 18 8 All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 1 Importa ant safe ety instructions s Caution To reduce the risk of electric shoc ck, do not rremove the cover. No user-servicea u able parts in nside. Referr servicing to qualified service personnel. Safeguarrds Electrical en nergy can perform many y useful funcctions. This unit has bee en engineereed and manufactured to assure yourr personal sa afety. Improp per use can rresult in pote ential electric cal shock or ffire hazards. In order nott to defeat the e safeguardss, observe th he following i nstructions for f its installa ation, use an d servicing. Approvalls * This equip pment has been b tested d and found d to comply y by Compe etent Body (Directive 89/336/EEC8 EMC) pursu uant to the product fam mily standard rd for audio professiona al use: EN 555103-1 and EN 55103-2 2 standard); EN61000- 3 - 2, EN 61000 - 3 - 3. In a domes stic environm ment this prroduct may cause radio o interferenc ces in which h case the user u may be e required to o take adequ uate measurres. his equipment has be een tested and found to comply by Compeetent Body (Directive e NOTES: Th 89/336/EEC C-EMC) purs suant to the e product ffamily stand dard for aud dio professsional use: EN 55103-1 and EN 551 103-2 standa ard ); EN610 000- 3 - 2 , E EN 61000 - 3 - 3. This is a class A prod duct. In a do omestic env vironment th his product may causee radio interrferences in n which case e the user may m be requiired to take adequate measures. m This equipment has been b tested and found to comply by Notified Body (Direcctive 2006/9 95/EEC L.V)) pursuant to o the audio apparatus safety s requi rements: Sttandard EN 60065. NOTE: This equipm ment has be een tested and a found to o comply wiith the limits s for a Classs A digital device, d pursuant to o part 15 of the FCC Ru ules. These llimits are de esigned to provide p reassonable pro otection against harrmful interfe erence when n the equipm ment is operated in a co ommercial eenvironmen nt. This equipment generates, uses, and can c radiate rradio freque ency energy y and, if not installed an nd used in accordance e with the in nstruction manual, m may y cause harm mful interferrence to rad dio commun nications. Operation o of this equip pment in a residential r a area is likely y to cause harmful interrference in which w case the user wiill be require ed to correc ct the interfe erence at his s own expense. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 2 Warn ning notices Location Install the amplifier in a well-ventilate ed location w where it will not n be exposed to high teemperature or o humidity. Do not insta all the ampliffier in a locattion that is exxposed to direct rays of the t sun, or nnear to hot appliances orr radiators. Excessive h heat can advversely affectt the cabinet and internal components s. Installation of the ampliffier in a damp p or dusty en nvironment may m result in malfunction or accident. Precautio ons regard ding installation Placing and d using the amplifier for lo ong periods o on heat-gene eration sourc ces will affecct performanc ces. Avoid placin ng the ampliffier on heat-g generating so ources. Install this a amplifier as far as possible from tun ners and TV sets. An am mplifier instal led in close proximity to such equipm ment may ca ause noise orr degradation n of the pictu ure. WARNING G: To preveent fire or electric shock: Do not expose this t equipme ent to rain or moisture. App paratus shalll not be exposed to drip pping or spla ashing and no objects fillled with liquids, such as vases, shalll be placed on o the appara atus”. Safety rules This device must be pow wered exclus sively by earrth connected mains soc ckets in electtrical network ks compliantt to the IEC 3 364 or similar rules. It is absoluttely necessary to verify this fundame ental requirem ment of safetty and, in caase of doubt, requires an accurate ch heck by qualified personn nel. The constru uctor cannot be considerred responsi ble for eventual damage es caused too persons, things or data for the misssing of accura ate earth link k. Beffore powering g this device verify that th he amplifier is supplied with w the correect voltage ra ating. Verrify that your mains conne ection is cap pable to satis sfy the powerr ratings of thhe device. Do not spill wate er or other liq quids into or on the unit. Do not use this unit if the ele ectrical powe er cord is fray yed or broke en. Do not remove the t cover. Removing the e cover will ex xpose you to o potentially ddangerous voltage. v No naked flame e sources suc ch like lighte d candles sh hould be plac ced on the am mplifier. Contact the authorized centre c for ord dinary and e extraordinary maintenance. Speaker d damage Martin Audio MA2.0 amplifiers are e among the e most pow werful professional ampl ifiers availab ble and are capable of p producing much more po ower than ma any loudspea akers can ha andle. It is thhe user's resp ponsibility to use suitable e speakers with w the amplifier and to u use them in a sensible wa ay that will noot cause dam mage. Martin Audiio will not be e responsible for damag ged speakers s. Consult th he speaker m manufacturer for powerhandling reccommendatio ons. Even if you reduce the gain using the amplifier''s front pane el attenuation n controls, it is still possible to reach full output p power if the input signal level is high h enough. A single high-power cresccendo can da amage highfrequency d drivers almo ost instantan neously, whi le low-frequ uency drivers s can usuallly withstand d very high, continuous power levells for a few seconds be efore they fa ail. Reduce power immeediately if yo ou hear anyy speaker "bo ottoming outt" - harsh pops p or craccking distortion that indic cate that thee speaker voice v coil orr diaphragm iis striking the e magnet ass sembly. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 3 Martin Audiio recommen nds that you use amplifie ers of this power range for more heaadroom (cleaner sound) rather than for increased d volume. Speaker o output shock hazarrd A Martin Au udio amplifierr is capable of o producing hazardous output o voltag ges. To avoidd electrical shock, do nott touch any e exposed spea aker wiring while w the amp plifier is operrating. This manual contains important information i on operating your Martin Audio aamplifier co orrectly and safety. Please read it carefully before opera ating your amplifier. a If you have aany questions, contactt your Martin n Audio dea aler. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 4 Inttroductiion The totally new Martin n Audio MA A2.0 amplifie er technolog gy has changed the w way the worrld looks att professiona al audio amplification. No o other ampliffiers come close c for applications dem manding high h power and long term re eliability. Thanks to ama azing reductiions in heat output along with reducctions in weight and the specific high output po ower, MA2.0 amplifiers ccan be used d in an unlim mited range of applicatio ons such as concert tou uring, opera houses, the eatres, churrches, cinem ma, theme parks, p televission sound stages and stadiums. w More sound and less weight Compared to a conventional amplifier, Martin n Audio MA2 2.0 technolo ogy offers ve very high effficiency and delivers mo ore power to o the loudsp peakers with h greatly reduced heat dissipation. This greate er efficiencyy mption to be enables dim mensions, weight w and power consum e reduced. The T output sstages of th he amplifiers typically run n at 95% efficciency, dissip pating only 5 5% of the inp put energy as s heat. One of the most interesting charac cteristics is tthat MA2.0 efficiency e is almost indeppendent of output o level. Conventional amplifierss achieve the eir best efficciency only at a full rated power p outpu t. Since stan ndard musicc has an averrage power density d of 40 0% of the ma aximum level, convention nal amplifierss can easily generate 10 times more heat than MA2.0 amplifie ers for the sa ame volume of sound. Superior Sound-Sonic c Accuracy Crystal-clea w end: the most accura ar highs and d a tight, we ell-defined low ate reproducction of an audio a signal. Patented design featurres ensure very v high pe erformance over parameters such aas distortion n, frequencyy response, sslew rate, pow wer bandwid dth and dump ping factor. gh Reliability y Totally Digital with Hig The MA2.0 series is based on PWM M technologyy that has be een used for 30 years orr more in pow wer supplies and inverters. PWM pro ovides high reliability, sm mall size, low w weight and high efficieency. A PWM converterr works as a high frequ uency sampler, convertiing the variable amplitu ude (audio) signal into an impulse sequence w with average value equal to the audio input. MA2.0 amp plifiers use ve ery high sampling frequen ncies to obta ain high perfo ormances accross the aud dio band. Compact & Lightweigh ht Martin Audio MA2.0 amplifiers a offfer incrediblyy compact dimensions are very ligghtweight making m them excellent fo or application ns where spa ace and weiight saving are a importan nt. They alsoo offer excellent ease off use. Always Goe es On The Show A The MA2.0 is completely protected against a everry possible error in operation and aree designed to o work underr w deliver maximum pow wer with max ximum safety y and increaased long-terrm reliability. every condiition. They will Anticipating g potential pro oblems at the design sta age means yo our show alw ways goes onn! All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 5 1 1.1 Insta allation and a operration Unpack king Carefully op pen the shipp ping carton and a check forr any noticea able damage e. Every Martin Audio amp plifier is completely teste ed and inspec cted before leaving l the fa factory and should s arrive in perfect co ondition. If you y find any damage, no otify the shipping compan ny immediateely. Be sure to save the carton and a all packing materials m for the t carrier's inspection. 1.2 Mountin ng The MA2.0 amplifiers will w mount in a standard 1 19" rack. Fou ur front pane el mounting hholes are pro ovided. Rearr support mo ounting holess are also provided. p Th hese should always we used to su pport the weight of the amplifier at the rear in a 19” rack. Your MA2.0 0 amplifier usses a forced--air cooling ssystem to ma aintain a low, even operaating tempera ature. Drawn by an intern nal fan, air en nters through h the slots in n the front pa anel and cou urses over annd through components. c The MA2.0 series ampllifiers feature e an "intellig ent" variable e-speed DC fan which iss controlled by b heat sinkk temperature e sensing circuits: the fan speed w will increase only when the t temperaature of eithe er heat sinkk requires it, which keepss fan noise to a minimu um and help ps cut dust accumulation a n inside. Und der extreme thermal load d, the fan willl force a very y large volum me of air thro ough the hea at sinks. If either hea at sink gets too hot, its sensing circcuit will reduce the outpu ut power. If the amplifier overheats, another sen nsing circuit shuts s down its circuit to ccut off powerr until it cools s to a safe teemperature. The T exhaustt cooling air is forced outt through the e rear of the e chassis (se ee below), so o make suree there is en nough space around the sides of the amplifier to allow the airr to escape. If it is rack mounted, m maake sure the e exhaust airr can flow witthout resista ance. If you are a using a rrack with clo osed backs, there must bbe at least one o standard rack space of opening in the front of the rack forr every four amplifiers. Amplifiers A maay be stacked directly on top of each other (no sp pace needed between un its), starting from the botttom of the raack. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 6 1.3 Operating Precau utions Make sure the AC maiins voltage is correct an nd is the sam me as that printed p on thhe rear of th he amplifier. Damage ca aused by con nnecting the amplifier to improper AC C voltage is not coveredd by the warrranty. Make sure the pow wer switch iss off before making m any in nput or outpu ut connection ns. It is alwayss a good ide ea to have the gain co ntrols muted d during pow wer-up to prrevent speak ker damage particularly if there is a high h signal le evel at the in puts. Whether yo ou purchase e them or build them yo ourself, use good quality input andd speaker cables. c Mostt intermittent problems arre caused by y faulty cabl es. Use goo od quality connectors andd cable alon ng with good soldering te echnique to ensure e trouble free reliab ility. 1.4 AC Main n connecttion Warning: b before conn necting to mains m be surre that the amplifier is set to the ccorrect mains voltage. The AC Main connection is made via the IEC typ pe connector on the rearr panel. The picture below w shows the connection to the ampliffier. Be sure that your AC C mains pow wer source has the requirrements indicated in this manual. Th he amplifier is a resistiv ve load for tthe mains network, miniimizing the reactive pow wer and the harmonic diistortion on the t current. The T system allows perfo ormance to be maintainedd even in cirrcumstances of varying tthe mains vo oltage. Is important to c connect the e ground forr safety, do o not use ad dapters thatt disable the e ground connection. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 7 1.5 Connec cting Inputts Input conne ections are made m via the 3-pin XLR-fe emale on the e rear of the amplifier. a The figure b below showss the connecttion of analog g input for ba alanced and unbalanced line. You ca an use eitherr configuratio on, but you must m considerr that unbala anced long lin nes can intro oduce noise iin the audio system. s The Link sw witch located d in the rear panel is for d direct paralle eling the rear input conn ectors. You can use the remaining in nput connecttor to carry signal s to othe er amps. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 8 1.6 Connec cting Outp puts Warning: th here are leth hal voltages s at the loud dspeaker co onnectors when w the am mplifier is turrned on. To prevent any y damages turn the am mplifier off be efore conne ecting the lo oudspeaker.. Output conn nectors are made m via Neutrik Speako on connectorrs. Consult th he wire gaugge chart to fin nd a suitable wire gauge to minimize power and damping facctor losses in n the speaker cables. Thhe outputs ca an also workk in bridge mo ode. In norm mal stereo or linked mono o mode, for each e channel 1+ of the S Speakon connector is the positive output and the 1- pin of the Speakon sho ould be treatted as the ne egative outpuut. Note: Chan nnel B is run n out of phas se internallyy, corrected by reversing g the connecctions from the t amplifierr output to the output con nnecter Chan nnel A is run n in phase. By B having channel A andd B operating g in opposite polarity, the e energy storrage in the power p supplyy is more efficient. This is s significant ffor signals below b 100Hz (sub bass e etc.) and improves the po ower bandwid dth. Be sure to use balance ed inputs on n all measurrement equipment (inclluding oscillloscope pro obes) if you are bench ttesting. No ote: in Bridge mode the link switch must be sw witched to “o on” and th he gain conttrols of both h channels must m be set to the samee level All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 9 2 2.1 S Setup an nd setting gs Introduc ction The figure right shows the front pa anel of the MA2.0 Amp plifier. The front p panel contro ols and indic cators give the user tottal control an nd detailed information about the status of th he amplifier. The gain control use es a logarith hmic scale frrom -∞ to +32dB. Read the instructions below careffully which will explain n the man ny functions of the amplifier. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 10 2.2 The LED D indicato ors The figure b below showss the front panel of the MA A2.0. The cliip LED, when n lighting, inddicates the clipping c state e for the output stage of th he correspon nding channe el. The signa al, -18dB and d -6dB LEDss operate as V-meter and d the signal L LED is illumin nated when the t signal is present in th he input stage of the corrrespondent channel. c The e "ready" LED D, when illum minated, indic cates that th e start-up tim me after pow wer-on is finisshed and the e amplifier iss ready to usse. The "tem mp" LED, wh hen lit, indica ates that the e output stage of the coorresponding g channel iss reducing the e output pow wer due to an n over-heated d state. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 11 3 3.1 Prote ection Turn-On n-Turn-Offf muting For about fo our seconds after turn-on n, and immed diately at turn n-off, the amplifier outputts are muted. 3.2 Short circuit prottection A short circcuit protection system sa afeguards the e amplifier's output trans sistors underr short circuits and otherr stressful loa ads. It is com mpletely inau udible when iinactive. In th he event of a short circu it condition, the red LED D will be illum minated. The amplifier pro otection has an auto reset mode which will attem mpt of reset the amplifierr for normal u use after 2 seconds. s If the t short circcuit is still prresent the amplifier will aattempt to re eset every 2 seconds until the short is removed. 3.3 Therma al protectio on The MA 2.0 0 amplifier uses u a contin nuously varia able speed fan f to assistt cooling (thee fan speed d changes in n response to o the amplifie er's cooling requirementss). If the hea atsink tempe erature reachhes approxim mately 75°C,, the "TEMP"" LED illumin nates and the e output pow wer is reduce ed to preventt damages too the output stage. If the e temperature e rises above e 85°C the th hermal sensiing circuitry will w mute eac ch channels power sectio on. Once the e heatsink ha as cooled be elow 85°C th he amplifier w will automatiically un-mutte but the T TEMP LED will w remain litt until the tem mperature has h dropped to 75°C. It is possible to reduce th he temperatture reducing g the outputt power. 3.4 DC fault protectio on If DC or exxcessive sub bsonic energ gy appears a at a channel output, an instantaneoous protection circuit willl mute both cchannels of the amplifierr. The ampli fier shutdow wn is used in nstead off of speaker relays, therebyy improving th he damping factor f and re eliability of th e MA2.0. 3.5 Input / Output O pro otection An ultrasonic network de ecouples RF F from the ou utputs and ke eeps the amp plifier stable w e loads. with reactive All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 12 4 4.1 User Maintenanc ce Cleanin ng Disconnect the amplifie er from the AC A main sou urce first; use a soft clotth and mild nnon-abrasive e solution to clean the fa aceplate and chassis. 4.2 Service e There are n no user-servicceable parts in your MA2 2.0 amplifier. Refer servic cing to qualiffied technical personnel. If your MA2.0 amplifier needs n repair, contact you ur Martin Aud dio dealer or distributor. 4.3 Dust rem moval Particularly in dusty en nvironments, the front fiilters clog with w dust and d dirt after pprolonged use, u this will interfere witth cooling. Yo ou may use compressed d air to remov ve the dust frrom filters. To remove air filters forr more comp prehensive ccleaning, uns screw the rettaining screw ws and pull the t covering grill forward d. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 13 5 Warra anty Martin Audio MA2.0 is warranted w ag gainst manuffacturing deffects in mate erials or craftftsmanship over o a period d of 3 (three) years from the date of orriginal purcha ase. During the w warranty perriod Martin Audio will, at iits discretion n, either repair or replace products wh hich prove to o be defective e provided th hat the produ uct is returne ed in its origin nal packaging, shipping pprepaid, to an authorised d Martin Audio service agent or distrib butor. Martin Audiio Ltd. cannot be held responsible r ffor defects caused c by unauthorised modification ns, improperr use, neglige ence, exposu ure to inclem ment weatherr conditions, act of God or accident, oor any use off this productt that is not in accordan nce with the e instructionss provided by b Martin Audio. Martinn Audio is not n liable forr consequenttial damagess. This warran nty is exclusive and no otther warrantyy is expressed or implied d. This warraanty does no ot affect yourr statutory rig ghts. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 14 7 7.1 T Technica al notes Block diagram d The diagram m below show ws the ampliifier block dia agram (1 Channel shown n). All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 15 7.2 Therma al Dissipattion Martin n Audio MA2.0 M Level Load Rated Power Sw witch in off position* Power onn, amplifier in iddle mode Pink Noise (1/8 rated power) Pink Noise (1/4 rated power) 8Ω / Stereo 16Ω / bridgedd 4Ω / stereo 8Ω / bridged 2Ω / stereo 4Ω / bridged Watt 2 x 600 1 x 1200 2 x 1000 1 x 2000 N/A N/A 8Ω / Stereo 16Ω / bridgedd 4Ω / stereo 8Ω / bridged 2Ω / stereo 4Ω / bridged 2 x 600 1 x 1200 2 x 1000 1 x 2000 N/A N/A AC Maains 230V AC 115V AC 0.13 0.2 0.09 0.4 Out Watt W In I Dissipaated 0 0 1..71 35 3 1.7 1 355 Ampeere Watt W Thermaal Dissipation BTU/hr Kcal/hr 5.8 119 1.5 30 BTU/hr Kcal/hr 1 2 150 188 733 247 62 1.5 3.1 250 313 988 332 84 N/A N/A N/A N/A N N/AA N/A N/A 1.8 3.6 300 375 1100 375 95 2.9 5.8 500 625 1600 546 138 N/A N/A N/A N/A N N/AA N/A N/A *Power abssorbsion with amplifier sw witched off is not zero bec cause to com mply with EN N60065/IEC 60065:20016 12 all amplifier circuitryy must includ de a “bleed” resistor acro oss the inco oming AC maains power to t discharge residual currrent to preve ent the risk of o shock from m an amplifier disconnecte ed from the m mains. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 16 7.3 Specific cation POWER RE EQUIREMEN NTS Power supp ply......................................................................................115-230V (-15%, + +15%) (50/60Hz) 800VA ................... ........................................................... .................. 0°C Operating te emperature .................... . 0 to 45°C Weight.................................................................. ........................................................... ............ 7.3K Kg (16.1 lbs) External dim mensions Width……… ……………………………… ……………… ……………………..……..… …..Standard 19” Rack: 483mm (19”) Depth……… ……..………… ……………… ……………… …….……………………… …………...… ……………3 358mm (14”) Height……… ……………… ……………………………… …….………… ……………… ……………1 R Rack Unit: 44 4mm (1.75”) AUDIO SEC CTIONS Bandwidth ((1W, 8Ohm)........................................ .......................................................... .................10 0Hz, 30KHz Damping factor (8Ohm).................................................................................................................. at 100Hz 1 > 500 Slew Rate ((8Ohm).................................................................................................>50V/μ μS (input filte er bypassed) S/N ratio......................................................................................................................>1112dB/A (20Hz to 20KHz) Distortion T THD………………………… ………….…… …….…..... < 0.05% from 1W to full poower (Typica ally <0.01%) Intermodula ation SMPTE E …………………………… ………..…. < 0.05% from 1W to full poower (Typica ally <0.01%) Intermodula ation DIM 30........................................ ............... <0 0.02% from 1W 1 to full pow wer (Typicallly <0.005%) Inputs............................................................................Balance ed to ground, XLR femalee with paralle el Male XLR R Impedance................................................................................................10 0KOhm eachh leg balance ed to ground Gain ……… ……………………………… …..…………… ….….…………………...… ……………… ……………… …….....32dB Outputs….… ……...…........................Ne eutrik 4-pole e Speakon co onnectors (pins 1+ 2+ parralleled, 1- 22 paralleled) OUTPUT SPECIFICATIIONS Output Pow wer EIAJat 1KH Hz, 1% THD 8Ω Per Cha annel………… ….…………… ……………… ………………… ……………… ……………… ………………..…….600W 4Ω Per Cha annel………… ….…………… ……………… ………………… ……………… ……………… ………………… …….1000W 16Ω Bridged d…………… ………………… ……………… ……………………………… ……………… …………………….1200W 8Ω Bridged……………… ……………… ………………… ……………… ……………………………… ……..……….……2000W FEATURES S Indicators… ……………………………… ……………… ………………… …………….… …..……2 x 4 segment LE ED bargraph Over-tempe erature foreccasting, thermal protecction, short circuit prote ection, overrload outputt protection, p limiter and permanen temperature e controlled air cooling system, clip nt signal lim miter, auto-re eset system, parallel inpu uts switch, in nput signal prresence LED D. All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 17 7.4 Technic cal Drawing All material © 2 2010 Martin Aud dio Ltd. Subjectt to change with hout notice 18