Univex AM-77 User's Manual
Contents
1. AM 77 Master AM 77 Slave Interconnect Cable Interconnect Cable 50 A vsingdon Muzio Frescarch Note This function requires at least 2 x AM 77 synchronised pre main amplifiers i Power OFF via the POWER R12 switch at the rear of both AM 77s ii Using a small flat blade screwdriver move the MODE switch R5 to the right to select MM iii Using a small flat blade screwdriver move the INT POWER AMP switch R4 to the left to select POWER AMP iv Repeat this process for the other AM 77 v Power ON both AM 77s via the respective POWER switch R12 51 Arbringcdon Muzio Frescarch 52 When the 3 5mm jack is used disconnect the RCA connecion to Input 4 at the rear of the AM 77 Section 5 Additional Connectivity Ansa Music Research 5a Input for iPod other portable music players Input 4 AU On the front right side panel there is a 3 5mm jack F4 This is for the connection of an iPod or any other portable music device for music playback through this medium To select this source change selection to Input 4 disconnect any RCA connection to Input 4 at the rear The USB connection F5 is purely for supplying power to the iPod other portable music device It serves no other function 53 Nbbingsdon Muzio Prescarch Pro switch is for the2. 58 Specifications Figure S 1 Specifications Table Inputs Volume Control Input Sensitivity IHF 2 83V Out Impedance Power Output see Notes IHF Dynamic Power FIC Output impedance Frequency Response 1dB Signal to noise ratio A weighted Operational Modes A vsingdon Muzio Frescarch 5xRCA 1x XLR Bal shared with 1 RCA 1 x iPod shared with 1 RCA 71dB OdB in 1dB steps Mute lt 0 05V gt 20KOhm 270 watts per channel at 4 or 8 ohm stereo mode 330 watts per channel at 8 ohm monoblock mode 480 watts per channel at 2 or 4 ohm monoblock mode 180 watts per channel at 4 or 8 ohm stereo mode 220 watts per channel at 8 ohm monoblock mode 320 watts per channel at 2 or 4 ohm monoblock mode 0 5 ohm 20 20 000 Hz 10Hz 50kHz gt 100dB Pre Main amplifier mode Power amplifier mode 59 Arvringcdon Muzio Frescarch 60 continued Thermionic Electron Valves Power Transformer Power consumption Power Supply Capacitance Rated voltage Colour Dimensions Weight Monoblock option An unlimited number of AM 77s can synchronised 5687 6900 NOS amplification stage 1200 VA Custom Double C Core Standby 50 W Power on 95 W at rated output 4R 1000 W 96 000uF in total 90V 135V amp 190V 260V AC Champagne or Titanium 17 9in W by 6 2in H by 18 3in D 46cm W by 16cm H by 47cm D 62 cm W by 30cm H by 78cm D shipped AM 77 75 lbs 34 kg S
3. Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Canadian Notice Avis Canadien Class B Equipment This Class B digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe B respecte toutes les exigences du Reglement sur le mat riel brouilleur du Canada Arvringcdon Muzio Frescarch CE This products complies with the EMC Directive 89 336 EEC and the Low Voltage Directive 73 23 EEC issued by the Commission of the European Community Compliance with these directives implies conformity to the following European Norms in parentheses are the equivalent international standards and regulations o EN55022 CISPR 22 Electromagnetic Interference o EN55024 IEC61000 4 2 3 4 5 6 8 11 Electromagnetic Immunity o EN61000 3 2 IEC61000 3 2 Power Line Harmonics o EN61000 3 3 IEC61000 3 3 Power Line Flicker o EN60950 IEC60950 Product Safety WARNINGS Arvvingdon Music Recscarch The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying this component This compo
4. as an integrated amplifier Warning ensure no speaker connector is in contact with the chassis to cause a short circuit 1b Setup Pre Main Stereo Amplifier Connection The following diagrams illustrate the standard connection of the AM 77 in pre main stereo amplifier mode This is the default factory setting and is suitable for the majority of audio systems Figure 1 3 depicts the use of standard banana spade speaker connectors while figure 1 4 illustrates the use of Speakon connectors Speaker R Speaker L Speaker Cable 13 Avsingdon Muzio Frescarch Figure 1 3 System connection using banana plug spade connector equipped speaker cables Speaker R Speaker L AMR recom mends the sonically supe M m Pro rior Speakon connectors Speaker Cable Speaker Cable Figure 1 4 System connection using Speakon connector equipped speaker cables i Connect the respective spade banana Speakon connectors of the speaker cables to the AM 77 ii Connect
5. the source s via the respective left and right XLR or RCA connectors to Inputs 1 5 iii Connect the IEC of the PC 77 mains power cable to the AM 77 and the socket to a mains source 14 The plastic protective film covering the display may be removed Section 2 Component Overview A vsingdon PAduzic Meezearch Figure 2 1 AM 77 Front Fascia FI STANDBY switch to place the AM 77 in active or standby mode F2 SOURCE selection buttons to select between the 5 different inputs F3 VOLUME buttons to adjust the volume level F4 iPod 3 5 Input Connector for the connection of an iPod or similar portable music device F5 iPod USB charging connector for re charging an iPod or similar portable music device 15 Nbbingsdon Muzio Frescarch Warning en sure no speaker con nector is in contact with the chassis 16 Figure 2 2 AM 77 Rear Panel O bbingcon Aluaic Reczaarch Dual Mono Amplifier AM 77 jgned and Engineered in Great Brit Desi fain RI R2 R3 R4 R5 R6 SPADE BANANA outputs for connection of standard termination speaker cables SPEAKON outputs for connection of Speakon terminated speaker cables HIFI PRO switch to allow for a s
6. AL Aubingdon PRlasic Meoezearch AM 77 Reference Class Dual Mono Pre Main Amplifier Owner s Manual Nbbingsdon Muzio Frescarch A vbingdon Muzio Frescarch FCC Declaration of Conformity United States only This device complies with Part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation FCC WARNING Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment NOTE This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation H this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures
7. Speaker L Synchronisation Cable Speaker Cable AM 77 Master AM 77 Slave Interconnect Cable Interconnect Cable CD Player 44 A vbingdon Muzio Frescarch Note This function requires at least 2 x AM 77 synchronised pre main amplifiers i Power OFF via the POWER R12 mains switch at the rear of both AM 77s ii Connect the cable from the Sync Out connector R8 of the master amplifier to the Sync In connector R of the slave amplifier The amplifier with the cable connected to Sync In becomes slaved to the other and will automatically follow the master AM 77 iii Using a small flat blade screwdriver move the MODE switch R5 to the right to select MM iv Using a small flat blade screwdriver move the INT POWER AMP switch R4 to the right to select INT AMP v Repeat this process for the other AM 77 vi Power both AM 77s back on via the POWER switch R12 45 Nbbingdon Muzio Frescarch Figure 4 9 Mode IV Power Stereo amplifier Speaker R Speaker L Speaker Cable Speaker Cable Power imt Interconnect Cable Interconnect Cable Int Amp Power Amp 46 Nbbingsdon Muzio Frescarch i Power OFF via the POWER R12 switch at the re
8. ar of the AM 77 ii Connect the desired separate pre amplifier to the AM 77 via the Balanced or RCA female connector of Input I R iii Using a small flat blade screwdriver move the MODE switch RS to the centre to select L R iv Using a small flat blade screwdriver move the INT POWER AMP switch R4 to the left to select POWER AMP v Power the AM 77 back on via the POWER switch R12 47 Nbbingdon Muzio Frescaurch Figure 4 9 Mode V Power Monoblock amplifier Speaker R Speaker L DI am Power Int Amp Amp Speaker Cable AM 77 Master AM 77 Slave Interconnect Cable Interconnect Cable 48 A vbingdon Muzio Frescarch Note This function requires at least 2 x AM 77 synchronised pre main amplifiers i Power OFF via the POWER R12 switch at the rear of both AM 77s ii Using a small flat blade screwdriver move the MODE switch R5 to the left to select M iii Using a small flat blade screwdriver move the INT POWER AMP switch R4 to the left to select POWER AMP iv Repeat this process for the other AM 77 v Power ON both AM 77s via the respective POWER switch R12 49 Nbbingdon Muzio Frescarch Figure 5 0 Mode VI Power Bi amplifier mode Speaker R Speaker L
9. bleshooting Maintenance Specifications 10 33 33 53 53 55 57 58 58 58 59 Section 1 Un ackin and Setu Arbringcdon Music Mresearch Figure 1 1 Front Panel of the AM 77 r l 2 3 gt 11 Nbbingsdon Muzio Frescarch Thank you for purchasing this AMR reference class component We hope you derive as much pleasure from using this component as we have enjoyed making it for you 1a Unpacking This section refers to the unpacking of the AM 77 and its subsequent setup Upon unpacking please find Please that check i AM 77 Reference Class Dual Mono Pre Main Amplifier all contents are ii RC 77 Remote Commander with 2 x AAA batteries a iii PC 77 OptiLink Reference mains power cable iv IC 77 OptiLink Reference interconnect cable XLR type v Synchronisation 3 5mm jack cable for linking up multiple AM 77s vi AM 77 Owner s Manual vii Quick Start Card viii AMR Warranty Card ix AMR Test Disk X Aluminium professional flightcase Please ensure that all items are present Should an item be missing please contact your AMR distributor dealer 12 A vbingdon Muzio Frescarch Default pre main mode the AM 77
10. ection 4 System Configurations for a detailed explanation 6 Speakon Outputs At the rear of the AM 77 are Speakon female connectors R2 to allow speaker cables terminated with Speakon male connectors to be connected to the AM 77 21 Nbbingsdon Muzio Mrezcarch 22 7 Synch Connectors At the rear of the AM 77 are Synchronisation In and Out connection points R8 This is for the linking of multiple AM 77s for alternative system configurations Please refer to Section 4 System Configurations for a detailed explanation 8 Mode switch At the rear of the AM 77 the Mode switch R5 allows for the AM 77 to alternate between Stereo Mono block Bi Amplifier modes Please refer to Section 4 System Configurations for a detailed explanation 9 Int Power switch At the rear of the AM 77 the Int Power switch R4 enables the AM 77 to alternate between pre main or power amplification modes Please refer to Section 4 System Configurations for a detailed explanation 10 HiFi Pro switch At the rear of the AM 77 the HiFi Pro switch R3 allows for a source with a transformer balanced output to be connected to the AM 77 Please refer to Section 5 Additional Connectivity for a detailed explanation 11 RS232 option connector At the rear of the AM 77 the RS232 connector R9 allows the AM 77 to be upgraded Please refer to Section 5 Additional Connectivity for a detailed explanation Nbbingsdon Muzio Fr
11. em check is complete and the OptiMains circuitry has completed its initiation process the AM 77 is ready for operation 2 Standby After start up pressing the STANDBY button F1 on either the front fascia or the RC 77 RC2 the AM 77 will switch to STANDBY mode 3 Source Selection From either the front fascia of the AM 77 F2 or the RC 77 RC3 select the desired source input for playback With PLAY selected from a connected source such as a CD 77 playback is attained Beware pro longed listening at high volume levels is likely to damage your hearing Arvringcdon Muzio Frescarch 4 Volume Adjustment From either the front fascia of the AM 77 F3 or the RC 77 RC4 select the desired volume While adjusting volume levels there is an audible click from AM 77 and the speakers This is the normal operation of the relays within the OptiLevel direct path precision volume control 5 Rear Inputs At the rear of the AM 77 there are 5 inputs for the connection of source components such as the CD 77 compact disk processor or a vinyl source Input 1 R6 is of most consequence because first while all 5 inputs can be connected via RCA only Input 1 also allows for the optional connection of XLR connectors Second in other configurations where the AM 77 is used in single channel mode all other inputs are defeated Signal input is allowed only through the LEFT channel white of Input 1 via XLR or RCA Please refer to S
12. escarch 12 Menu RC 77 only The MENU button RC1 will enter the Advanced Menu system of the AM 77 Please refer to Section 3 Advanced Features for a detailed explanation 13 OK RC 77 only The OK button on RC7 the RC 77 is for the confirmation of a desired selection within the Advanced Menu system of the AM 77 Please refer to Section 3 Advanced Features for a detailed explanation 14 Mute RC 77 only The MUTE button RCS will disengage the volume of the AM 77 and re engage the volume if it is pressed again 15 Brightness RC 77 only The BRIGHTNESS button RC6 will adjust the display s brightness at the front fascia of the AM 77 There are 4 different brightness settings including display off With its own isolated power supply with the display ON or OFF there is no sonic impact upon the AM 77 23 Arbringcdon Muzio Frescarch 24 Section 3 Advanced Features Arvringcdon Music Peesearch The following section provides instructions to access the AM 77 s advanced features 3a Labeling of Inputs and Setting Level Offset With the AM 77 in one process it is possible to label each of the 5 inputs with a corresponding source and to set the respective level offset This function is recommended only after ALL desired sources have been connected to the AM 77 A list of available labels is shown overleaf in chronological order The main advantage of setting the level offset is that the volume level will change
13. ferent inputs RC4 VOLUME buttons to adjust the volume level RC5 MUTE button to Mute temporarily turn off sound the AM 77 RC6 BRIGHTNESS button to adjust brightness levels RC7 OK button to be used in Advanced Features mode Please refer to Section 3 Advanced Features section for more details RC 77 battery installation To install the 2 x AAA batteries using a Philips screwdriver remove the four screws at the four corners of the rear battery compartment Install the 2 x AAA batteries in the correct direction according to the baseplate inside the battery compartment Replace the battery compartment and the four cover screws Once powered OFF always wait 30 seconds before switching on again Nbbingsdon Muzio Frescarch 2a Start Up 1 Power On Off Press the POWER rocker switch R12 at the rear of the AMP to switch on mains power to the AM 77 To switch the mains power OFF press again and release Always WAIT at least 30 seconds before switching ON again This is to enable the OptiMains circuit to shutdown properly The display will light up to indicate the unit is switched on and ready for use This should take just under 1 minute as the OptiMains circuit is verifying and the AM 77 is warming up The display should flash the message The display will look like this The display will then show the remaining warm up time 19 Nbbingsdon Plesie Frescarch 20 Once the syst
14. few pre amplifiers that have floating transformer balanced outputs 5b HiFi Pro Switches for Balanced XLR inputs im mj Mode am W G GW m een Power Int Amp Amp HiFi Pro For the majority of sources the HiFi Pro switch R3 is best left in the HiFi position However if the source has a pro audio style transformer balanced output the HiFi Pro switch needs to be set to Pro A transformer balanced output uses a floating secondary from an audio transformer unlike electronic balanced outputs of any description the signal is NOT referenced to ground Pin 1 For such rather rare equipment the Pro switch is engaged to short scircuit Pins 1 amp 3 thus establishing the ground connection 54 Nbbingdon Muzio Prescarch 5c RS232 Options Connector For future upgrades Pee R ac o R Option The RS232 Options connector port R9 is for upgrading the functionality of the AM 77 in future Contact your local AMR distributor dealer for more detailed instructions 55 Arbringcdon Muzio Frescarch 56 Section 6 Technical Features Nbbingsdon eoi Peesearch The following section provides a brief explanation of the most salie
15. hipped 121 Ibs 55 kg Information and specifications subject to change without notice Nbbingsdon Muzio Frescarch Notes At AMR we feel that the IHF standard represents the best available rigidly mandated and standardised musically relevant measurements applicable today in preference to DIN45500 among others despite their formidable age and our wish for something more up to date while the FTC mandated standard is applicable under like for like fair trade descriptions requirements in the USA but we feel what is fair in the USA is still fair elsewhere to make sure that one maker s advertised watt is like for like equal to that of another As a result we feature IHF based specifications and measurements where possible and FTC where mandated appropriate i FTC Federal Trade Commission USA Federal Trade Commission a US based trade standard body whose standardised measurement procedures 2000 revision we apply where we would be required to do so under US Law even though we are UK based Past the FTC ruling originally from 1974 updated in 2003 derived rating there is a secondary power rating the IHF Dynamic Power also defined in the mid 70 s which is the maximum power the amplifier can put out for a burst 20ms long or in other words for a short musical peak An amplifier that can deliver 200W for 20ms but 50W continuously will have a FTC Power Rating of 50W but an IHF Dynamic Power Rating of 200W An amplifie
16. ification mode to drive suitably equipped speakers Figure 4 0 Connection of more than one AM 77 Before an alternative configuration is selected AL WAYS ensure the AM 77 is switched OFF 34 A vbingdon Muzio Frescarch The following pages provide an outline of the theoretical wiring system behind each of the six different config urations with a brief accompanying summary Figure 4 1 Mode I Pre Main Stereo Left Speaker Standard system with AM 77 as the only amplifier 1st AM 77 Right Speaker 35 Nbbingsdon Plesie Mrezcarch Figure 4 2 Mode II Pre Main Monoblock Speaker Need 2 or more AM 77s Drive low impedance speakers that only have one set of terminal connections 600W 20hm RMS and 300W 10hm RMS without current clipping This is best suited to drive very low impedance speakers Apogee Diva et al 36 A vbingdon Muzio Frescarch Figure 4 3 Mode III Pre Main Bi Amplifier L Need 2 or more AM 77s Drive speakers that have more than one set of terminal connections with improved per 1st AM 77 Left formance and dynamic range w o Speaker Virtually all the power supply power is avail able to the low frequency channel with imp proved channel separation Right om ee Speaker 37 Arvringcdon STen Frescarch Figure 4 4 Mode IV Power Stereo Same as Mode I except the Pre Amp
17. in real time so that the user may adjust the offset without the need for additional equipment By using this function and selecting the desired level offset one may match the volume level of all inputs so that when switching between sources the volume remains the same thereby avoiding undesirable and potentially equipment damaging noise levels For example 25 A vsingedon Muzio Frescarch List of available inputs All types of sources accomodated 26 A vbingdon Muzio Frescarch The following steps outline the procedure to label all the inputs and set the respective level offset The AM 77 s default labelling of its inputs starts from Input 1 and runs through to Input 5 i Press MENU RCI on the RC 77 ii The display will flash Labelling Input 1 iii The 2 line of the display will commence with the first from a list of input labels please see the previous page for a list of input labels iv Scroll using the buttons of the Volume RC4 iv At the desired label press OK RC7 to store the new label for that specific input v The display will flash Level Offset On the RC 77 using volume buttons select the desired level press OK RC7 to confirm vi The display will move onto Labelling Input 2 vi Repeat this process for the other inputs vii One the last input Input 5 has been programmed press OR viii Normal operati
18. l of 2 thermionic electron valves the AM 77 may become warm during operation This is normal Given this it is imperative that the AM 77 when installed its location or position DOES NOT interfere with its proper ventilation For example it should not be situated on a bed sofa rug or similar surface that may block the top or bottom ventilation openings or placed in a built in installation such as a bookcase or cabinet that may impede the flow of air through its top and bottom ventilation openings Do not place the component in a location near heat sources or in a place subject to direct sunlight excessive dust or mechanical shock Do not place the component in an inclined position It is designed to be operated in a 7 Nbbingsdon Muzio Frescarch horizontal position only Do not place heavy objects on the component Keep the component away from equipment with strong magnets such as microwave ovens or large loudspeakers To prevent fire or shock hazard do not place vessels filled with liquids such as vases on the component Touch Sensitive Buttons On the front fascia of this AMR component are touch sensitive buttons Due to the wide variance of climes around the world instances may arise where to activate a button the touching finger may be required to be in contact with both the button and the front fascia to register the touching finger may have to touch the chassis to discharge any static electricity prior to butto
19. lifier sec tion has been bypassed A separate pre amplifier is needed to control the volume Right Speaker 38 A vsingdon Muzio Frescarch Figure 4 5 Mode V Power Monoblock Same as Mode II except the Pre Amplifier I section has been bypassed A separate pre amplifier is needed to control the volume 1st AM 77 Left Speaker 2nd AM 77 Right Speaker 39 Nbbingsdon STen Mrezcarch Figure 4 6 Mode VI Power Bi Amplifier Same as Mode III except the Pre Amplifier I section has been bypassed A separate pre amplifier is needed to control 1st AM 77 the volume Left em em e Speaker 2nd AM 77 Right Speaker 40 A vbingedon Muzio Frescarch 4b Switching and Connection Diagrams for Different Modes The following is a description of the switch settings and connections required to engage the various modes Figure 4 7 Mode I Pre Main Stereo amplifier default Speaker R Speaker L The default factory setting 6 2 cea A SE CD 77 This is the factory default setting the connection for which has been described in detail in Section I Unpack ing and Setup We have illustrated the default switch
20. n exposed to rain or liquids of any kind D The component does not appear to operate normally or exhibits a marked change in performance E The component has been dropped or the enclosure has been damaged DO NOT ATTEMPT SERVICING OF THIS UNIT YOURSELF REFER SERVICING TO QUALIFIED AMR SERVICE PERSONNEL Upon completion of any servicing or repairs request the service point s assurance that only AMR Authorised Replacement Parts with the same characteristics as the original parts have been used and that the routine safety checks have been performed to guarantee that the component is in a safe operating condition REPLACEMENT WITH UNAUTHORIZED PARTS MAY RESULT IN FIRE ELECTRIC SHOCK OR OTHER HAZARDS Arvringcdon Muzio Frescarch Precautions This equipment has been tested and found to comply with the limits set out in the EMC Directive using a connection cable shorter than 3 metres On power sources The mains power cable should be routed so that it is not likely to be walked on or pinched especially near the plug or back panel receptacle The component should not be disconnected from the AC power source as long as it is connected to the wall outlet even if the component itself has been turned off If this component is not going to be used for a long time be sure to disconnect the component from the wall outlet To disconnect the AC power cable grasp the plug itself never pull the cable CAUTION On placement With a tota
21. n selection Running In AMR estimates that the AM 77 may take between 300 500 operating hours for all of the internal components to be fully broken in Please anticipate the sonic performance of the AM 77 to settle only after it has been used for this approximate length of time Stand By Please note that the solid state section needs to find its equilibrium and due to the unavoidable use of electro lytic capacitors and an effect called soakage around 24 48 hours of standby or operation are required to stabilise performance Therefore standby does not shut down the solid state sections only the valves Nbbingsdon Muzio Frescarch Contents WARNINGS 5 Section 1 Unpacking and Setup 11 1a Unpacking 12 1b Setup Section 2 Component Overview 15 2a Start Up Section 3 Advanced Features 25 3a Labeling of Inputs and Setting Level Offset 25 3b Setting Fixed Input Level 28 3c OptiMains Protection for Excessive Under Over Voltages 30 3d OptiProtect Speaker Overload Protection 31 Nbbingsdon Muzio Frescarch Section 4 System Configurations 4a OptiOperation Different System Configurations 4b Switching and Connection Diagrams for Different Modes Section 5 Additional Connectivity 5a Input for iPod other portable music players 5b HiFi Pro Switches for Balanced XLR inputs 5c RS232 Options Connector Section 6 Technical Features Appendix Troubleshooting amp Maintanence Trou
22. nent weighs over 40 kilograms Do not place this component on an unstable cart stand tripod bracket or table as the component may fall causing serious injury to a child or adult and serious damage to the unit An appliance and cart combination should be moved with care Quick stops excessive force and uneven surfaces may cause the component and cart combination to overturn Any mounting of the device on a wall or ceiling should follow the manufacturer s instructions and should use a mounting accessory recommended by the manufacturer Read and follow all the safety and operating instructions before connecting or using this component All warnings on the component and in its operating instructions should be adhered to Retain this Owner s Manual for future reference Do not use this unit near water for example near a bath tub washbowl kitchen sink laundry tub in a wet basement or near a swimming pool Unplug the component from the wall outlet before cleaning Never use benzine thinner or other solvents for cleaning use only a soft damp cloth Nbbingsdon Muzio Frescarch Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through any openings This component should be serviced only by qualified AMR service personnel when A The power cable or the power input socket has been damaged B Objects have fallen or liquid has been spilled into the component C The component has bee
23. nt technical features of the AM 77 Circuit X is AMR s unique circuit with NOS thermionic electron valves for voltage gain with a patent pending error cancellation circuit for the Class A matched bipolar output power devices OptiGain inherently outperforms all conventional types of volume controls At low as well at high volumes the dynamic range is virtually unhindered to preserve every bit of minuscule information in the signal OptiOperation modes offer unrivalled functionality and flexibility one or more AM 77s can be synchronised to deliver the optimum level of quality and can be seamlessly integrated into home theatre setups OptiPower supply circuit is completely free of regulators This is an essential pre cursor for subsequent thermionic electron valve circuits operating with no negative feedback OptiMains is truly one of a kind as it will detect monitor and adjust if necessary the incoming voltage to ensure the correct voltage is always supplied to the relevant internal sub sections OptiTrans power supply transformers are advanced double C Core types which sonically outclass traditional EI and toroidal transformers OptiSeal is the galvanic sealing of functional sections in the transformer and includes the use of separate transformer windings to ensure that noise from one section does not contaminate adjacent sections in a full dual mono audio circuit design For a more detailed explanation of these and
24. on sections the AM 77 controls volume level and input selection controls In power amplification mode the AM 77 wil require an external separate pre amplifier to handle volume and input selection duties The following section describes alternative configurations for the AM 77 beyond the factory default pre main stereo amplifier setting With diverse system permutations in mind the AM 77 has built in six OptiOperation modes to seamlessly integrate it into virtually any audio system configuration Mode I Pre Main Stereo amplifier mode default Mode II Pre Main Monoblock amplifier mode Mode III Pre Main Bi amplifier mode horizontal biamping Mode IV Power amplifier Stereo mode Mode V Power amplifier Monoblock mode Mode VI Power Bi amplifier mode horizontal biamping The combination of synchronising multiple AM 77s together in practical terms is limited only by room size and cost This approach allows for systems at the core comprising of any number of AM 77s to be constructed to any level of complexity 33 Nbbingdon Muzio Frescaurch In short the AM 77 s flexibility is limited only to that of the imagination For example one may employ 3xAM 77s synchronised along with a high quality digital crossover to drive a fully active 3 way speaker system to the highest possible level of sound reproduction or 3xAM 77s synchronised for a multi channel surround sound system or 2xAM 77s synchronised in monoblock or bi ampl
25. on will resume at Input 5 If this is not the desired input use SOURCE F2 or RC3 to select the input of choice to resume listening 27 Arvringcdon Muzio Frescarch 28 3b Setting Fixed Input Level When using the AM 77 as part of a home theatre system with an external processor controlling the overall system volume it is possible to program one of the five input sources to have a fixed level of Input such as for a home theatre system of either 0 775 V Odbu or 1 55V 6dBu This allows the 2 Channel music system to be seamlessly integrated into a high performance multi channel home cinema system Go to Section 3a and follow the instructions to select the last label Simultaneously press volume on the front fascia of the AM 77 and OK on the RC 77 Nbbingsdon Plesie Mrezcarch HTD mode always use an external pre amp as this mode will switch the AM 77 to full volume Having entered the Fixed Input menu now select or Warning By selecting Home Theater Direct mode the volume of the amplifier will be switched to full Hence if it is used incorrectly it will damage the connecting speakers AMR assumes no responsibility for any speaker damage arising from the use of the AM 77 29 Nbbingsdon Muzio Frescarch 3c OptiMains Protection for Excessive Under Over Voltages The AM 77 is fitted with the OptiMains system to condition and adjust the incoming mains supply for best
26. operation under all normal mains conditions including situations that will cause audible problems without Opti Mains Sometimes there In almost every country throughout the world instances do arise where fluctuations in the main electricity SRO exceeds that of a correctly operating mains supply and any electrical item product is no longer properly served mains fluctua JE In the case of extreme power surges brown outs or other exceptional unexpected conditions that exceed the 8 safety margins the OptiMains system automatically will switch off the mains power to the internal parts of equipment to prevent any damage from occuring If the display reads OptiMains amp C Yom i i g g e ou b g i do 6 will detect and protect Power OFF your AMR component and wait at least 5 minutes If and when the mains electricity has been deemed to have returned to normal such as during a brown out and the lights have dimmed but have returned to normal brightness then power up your AMR component as per the manual s instructions 30 A vsingdon Muzio Frescarch If there are any questions please contact your nearest AMR distributor dealer 3d OptiProtect Speaker Overload Protection Within OptiProtect the AM 77 has an in built speaker protection circuit Unlike common protection systems which are in series with the speaker output and where the music signal always passes through the protection circuit the AMR speaker protection sys
27. other features please go to www amr audio co uk 57 Awinsdon MppEndix Troubleshooting Figure A 1 Troubleshooting Guide Symptom With power ON no power is registered No sound Strange blast sound Remote control does not work A humming sound can be heard Front switches jump enter Standby Other problems Possible cause e poor no power plug connection at mains power point e blown fuse at mains plug e incorrect audio cable connections e incorrect amplifier operation check speaker connectors are not in contact with the chassis and e remote control batteries have expired e object obscuring remote sensor on the AM 77 no line of sight e loose cable connections e static electricity Solution insert the power plug firmly into the AC e check and change mains plug fuse e connect the sources to the AM 77 correctly e make sure that the input selector on the AM 77 is set to the desired source e adjust fitting between speaker and chassis connectors and terminal Ensure no contact between chassis and spade terminals no short circuiting e replace 2 x AAA batteries e remove any objects directly in front of the AM 77 e re attach the loose cables correctly e Touch the chassis prior to pressing a sensor to dis charge Then press the desired sensor e go to the Contents section and re trace the procedure or contact your nearest AMR distributor dealer
28. ource with transformer balanced output INT POWER Amp switch to alternate between Pre Main and Power Amplification setings MODE switch to alternate between Stereo Monoblock Bi Amplification settings INPUT 1 shared XLR and RCA input for signal input of source equipment A vbingdon Muzio Frescarch R7 INPUTS 2 5 RCA inputs for signal input of source equipment R8 SYNC connectors for connection of more than one AM 77 R9 RS232 option connector to facilitate future upgrades R10 Infra Red Link for connection of a wireline remote control R11 IEC power connector for the connection of a PC 77 mains power cable to the AM 77 R12 POWER Switch to switch on mains electricity to the AM 77 In the majority of audio systems the AM 77 is most likely to be operated as a Pre Main Amplifier please inspect the rear panel of the AM 77 to verify that the default settings in bold to enable the AM 77 to operate in this mode are as follows 1 HIFI PRO switches are set to HiFi left position 2 MODE switch is set to LR middle position 3 INT POWER switch is set to Int right position Please refer to Sections 3 5 for a more detail explanation 17 Nbbingsdon Muzio Mrezcarch 18 Figure 2 3 RC 77 Remote Control RCI MENU button to enter Advanced Features mode RC2 STANDBY button to place the AM 77 in active or standby mode RC3 SOURCE selection buttons to select between the 5 dif
29. positions here for ease of reference to re configure from an alternative system setup back to the pre main stereo amplifier mode 41 Nbbingdon Muzio Frescarch Figure 4 8 Mode II Pre Main Monoblock amplifiers Speaker R Speaker L Synchronisation Cable Speaker Cable AM 77 Master AM 77 Slave Interconnect Cable Interconnect Cable CD 77 42 A vbingdon Muzio Frescarch Note This function requires at least 2 x AM 77 synchronised pre main amplifiers i Power OFF via the POWER R12 mains switch at the rear of both AM 77s ii Connect the cable from the Sync Out connector R of the master amplifier to the Sync In connector R of the slave amplifier The amplifier with the cable connected to Sync In becomes slaved to the other and will automatically follow the master AM 77 iii Using a small flat blade screwdriver move the MODE switch R5 to the left to select M iv Using a small flat blade screwdriver move the INT POWER AMP switch R4 to the right to select INT AMP v Repeat this process for the other AM 77 vi Power both AM 77s back on via the POWER switch R12 43 Nbbingdon Muzio Frescarch Figure 4 8 Mode III Pre Main Bi amplifier horizontal bi amping Speaker R
30. r that can deliver 200W for 2ms but 150W continuously will have a FTC Power Rating of 150W but an IHF Dynamic Power Rating of 200W However the available undistorted peak output with music signals is actually the same for both Amplifiers ii IHF Institute of High Fidelity Institute of High Fidelity a US based standard body now incorporated into the International Electrotechnical Commission whose standardised measurements we usually apply The Federal Trade Commission defines the information about an amplifier that a US manufacturer or distributor must provide FTC ratings derive from test data and state an amplifier s continuous average output capability into a defined load across a defined frequency range usually 20Hz 20kHz but any range can be used as long as it is stated Also the amplifier is tested with both channels driven placing maximum strain on the power supply so the test demonstrates its capacity in real world conditions This allows like for like comparison of amplifiers that use FTC ratings For that reason you won t find any published FTC ratings for an amplifier s output into a 2 Ohm load ZA PEL Abbingdon Music Research is a subsidiary of the Abbingdon Global Group 22 Notting Hill Gate London W11 3JE United Kingdom Tel 44 0 870 420 5505 Fax 44 0 700 596 1065 61
31. tem acts as a crowbar circuit shorting across the output hence it is separate from the audio circuitry and does not affect the sound quality unless it is engaged This is mainly a final safeguard against equipment failure and or extreme levels of over driving the amplifier and speakers When the display shows This indicates that the AM 77 has detected an output condition that could potentially damage the speakers connected to it Normally switching the AM 77 off waiting 20 seconds and switching it back on will reset the protection circuit if the cause was for example excessive signal levels In the extremely rare event that an internal malfunction of the AM 77 is the cause for the protection circuit to engage the protection will re engage on switch on indicating the need for the AM 77 to be serviced 31 Arbringcdon Muzio Frescarch 32 It is assumed all prior sections have been read amp understood with all requisite connections made Six different modes Supreme adapt ability Section 4 System Configurations eis Music Reeceareh 4a OptiOperation Different System Configurations In keeping with AMR s philosophy that no one sound fits all the AM 77 is also adaptable to suit virtually any system configuration able to operate at one end as a pre main stereo amplifier and at the other as a single channel power amplifier In pre main amplifier mode the AM 77 will use both the pre and power amplificati
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