PM AM-77 V2_3.pmd
Contents
1.2. Synchronisation Cable Speaker Cable AM 77 Master AM 77 Slave Interconnect Cable Interconnect Cable CD 77 40 7 PS 2 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 R8 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 41 Figure 4 8 Mode III Pre Main Bi amplifier horizontal bi amping Speaker R Speaker L Synchronisation Cable Speaker Cable AM 77 Master AM 77 Slave Interconnect Cable _ Interconnect Cable CD Player 42 7 PS 2 Note This function requires at least 2 x AM 77 synchronised pre main amplifiers i Power OFF via the POWER R12 mains switch
3. 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 other features please go to www amr audio co uk 53 5 7 PITT 54 gt Appendix Troubleshooting Figure A 1 Troubleshooting Guide Symptom Possible cause With power ON e poor no power plug connection no power is registered at mains power point e blown fuse at mains plug No sound e incorrect audio cable connections e incorrect amplifier operation Strange blast sound e check speaker connectors are not in contact with the chassis and short circuiting Remote control does e remote control batteries have expired not work e object obscuring remote sensor on the AM 77 no line of sight A humming sound e loose cable connections can be heard Front switches jump e static electricity enter Standby If other problems are experienced Solution e insert t
4. gt 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 775V 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 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 27 AI ae HTD mode always use an external pre amp as this mode will switch 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 28 Sometimes there are excessive mains fluctua tions If there are any questions please contact your nearest AMR distributor dealer y PAT 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 operation under all normal mains conditions including situations that will cause audible
5. 1000 W 48 000uF per channel 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 Amplifier 99 Ibs 45 kg Shipped 114 1bs 52 kg Information and specifications subject to change without notice 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 amplifie
6. problems without Opti Mains In almost every country throughout the world instances do arise where fluctuations in the main electricity exceeds that of a correctly operating mains supply and any electrical item product is no longer properly served In the case of extreme power surges brown outs or other exceptional unexpected conditions that exceed the 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 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 29 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 system 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 extrem
7. 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 button 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 Hence 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 Hence standby does not shut down the solid state sections only the valves Contents WARNINGS Section 1 Unpacking and Setup la Unpacking 1b Setup Section 2 Component Overview 2a Start Up Section 3 Advanced Features 3a Labeling of Inputs and Setting Level Offset 3b Setting Fixed Input Level 3c OptiMains Protection for Excessive Under Over Voltages 3d OptiProtect Speaker Overload Protection 10 11 12 14 18 24 24 27 29 30 Section 4 System Configurations 4a OptiOperation Different System Configurations 4b Switching and Connection Diagrams fo
8. 2nd AM 77 Right Speaker 37 L Same as Mode III except the Pre Amplifier sec tion has been bypassed A separate pre amplifier is needed to control the volume 1st AM 77 Left Speaker 2nd AM 77 38 The default factory setting SN lt PI 2 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 e pr Se jam PE yen Speaker Cable Interconnect Cable Int Amp Power Amp g CD 77 sg This is the factory default setting the connection for which has been described in detail in Section 1 Unpack ing and Setup We have illustrated the default switch positions here for ease of reference to re configure from an alternative system setup back to the pre main stereo amplifier mode 39 Figure 4 8 Mode II Pre Main Monoblock amplifier Speaker R Speaker L mm ta Power Int mp
9. Abbingdon Music Research AM 77 Reference Class Dual Mono Pre Main Amplifier Owner s Manual All the Music Recreated A WARNINGS ANTS 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 component 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 Care should be ta
10. 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 All the Music Recreated 17 FS Once powered OFF always wait 20 seconds before switching on again 18 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 20 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 P y a y hap ga Once the system check is complete and the OptiMains circuitry has completed its initiation process the AM 77 is ready for operation 2 Standby By pressing
11. at all items are present Should an item be missing please contact your AMR distributor dealer 10 SN lt PI 2 1b Setup Pre Main Stereo Amplifier Connection Default pre main The following diagrams illustrate the standard connection of the AM 77 in pre main stereo amplifier mode This mode the AM 77 is the default factory setting and is suitable for the majority of audio systems Figure 1 3 depicts the use of asan i ated standard banana spade speaker connectors while figure 1 4 illustrates the use of Speakon connectors amplifier Figure 1 3 System connection using banana plug spade connector equipped speaker cables Speaker R Speaker L Warning ensure no speaker connector is in contact with the chassis to cause a short circuit mi mi ode MO G Power Int Amp Amp 11 ED ANY Figure 1 4 System connection using Speakon connector equipped speaker cables Speaker R Speaker L AMR recom mends the sonically supe rior Speakon connectors Speaker Cable CD 77 i Connect the respective spade banana Speakon connectors of the speaker cab
12. 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 R8 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 RS 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 43 Figure 4 9 Mode IV Power Stereo amplifier Speaker R Speaker Cable Interconnect Cable Power Int Amp Amp 44 Speaker L Interconnect Cable SN ANT i Power OFF via the POWER R12 switch at the rear 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 R6 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 45 Figure 4 9 M
13. cess for the other AM 77 v Power ON both AM 77s via the respective POWER switch R12 49 When the 3 5mm jack is used disconnect the RCA connecion to Input 4 at the rear of the AM 77 50 Section 5 Additional Connectivity 5a Input for iPod other portable music players ice lle NR Input 4 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 dis connect 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 Pro switch is for the few pre amplifiers that have floating transformer balanced outputs 5b HiFi Pro Switches for Balanced XLR inputs Power Amp Int Amp 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 au
14. d 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 31 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 amplification mode to drive suitably equipped speakers Figure 4 0 Connection of more than one AM 77 Before an alternative configuration is selected always first ensure power to the AM 77 is OFF 32 The following pages provide an outline of the theoretical wiring system behind each of the six diffe
15. dio 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 51 A For future upgrades 5c RS232 Options Connector 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 52 Section 6 Technical Features PAR The following section provides a brief explanation of the most salient 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
16. e 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 30 It is assumed all prior sections have been read amp understood with all requisite connections made Six different modes Supreme adapt ability N PN ws Section 4 System Configurations 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 amplification 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 beyon
17. em 4 for details 15 Remote Commander 77 Menu This enters the Advanced Menu system of the AM 77 Please refer to Section 3 Advanced Features for a detailed explanation 16 Remote Commander 77 OK This 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 Figure 2 3 RC5 Figure 2 3 RC6 17 Remote Commander 77 Mute During operation this disengages the volume of the AM 77 and re engages the volume if it is pressed again 18 Remote Commander 77 Brightness This allows for the adjustment of 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 24 Section 3 Advanced Features 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 Alist of available labels is shown overleaf in chronological order The main advantage of setting the level offset is that the volume level will change in real time so that the user may adjust t
18. ernate between Pre Main Monoblock Bi Amplification setings MODE switch to alternate between Pre Main Monoblock Bi Amplification settings INPUT 1 shared XLR and RCA input for signal input of source equipment R7 INPUTS 2 5 RCA inputs for signal input of source equipment RS SYNC connectors for connection of more than one AM 77 R9 RS232 option connector to facilitate future upgrades RIO IR Connector for connection of wireline remote control RII IEC power connector for the connection of an AC mains power cable to the AM 77 RI2 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 15 16 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 different inputs RC4 VOLUME buttons to adjust the volume level RCS MUTE button to Mute temporarily turn off sound the AM 77 RC6 BRIGHTNESS button to
19. he 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 List of available inputs All types of sourcescatered for 25 26 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 Select the desired level press OK RC7 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 OK viii Normal operation 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 y AN
20. he 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 with the chassis e replace 2 x AAA batteries e remove any objects directly in front of the AM 77 e Touch the chassis prior to pressing a sensor to dis charge Then press the desired sensor e Revert to the manual and retrace the procedure Specifications Figure S 1 Specifications Table Inputs Volume Control Input Sensitivity Power Output see Notes Output impedance Frequency Response 1dB Signal to noise ratio A weighted Operational Modes 5xRCA 1 x XLR Bal shared with 1 RCA 1 x iPod shared with 1 RCA 71dB OdB in 1dB steps Mute IHF 2 83V Out Impedance lt 0 05V gt 20KOhm IHF Dynamic Power 270 watts per channel at 8ohm FTC 180 watts per channel at 8 ohm 180 watts per channel at 4 ohm 0 5 ohm 20 20 000 Hz 10Hz 50kHz gt 100dB Pre Main amplifier mode Power amplifier mode Monoblock option An unlimited number of AM 77s can synchronised 55 FN PN 56 Continued Power Transformer Power consumption Power Supply Capacitance Rated voltage Colour Dimensions Weight 1200 VA Custom Double C Core Standby 50 W Power on 95 W at rated output 4R
21. ken 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 been 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 Precautions This component has been tested and found to comply with the limits set out in the EMC Directive using a connection cable shorter than 3 metres 7 PRIA 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 l
22. les to the AM 77 ii Connect 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 12 The plastic protective film covering the display may be removed Section 2 Component Overview Figure 2 1 AM 77 Front Fascia CO Lod 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 13 Warning if a speaker con nector touch es the chas sis a short circuit will occur 14 Figure 2 2 AM 77 Rear Panel Dual Mono Amplifier AM 77 Designed and Engineered in Great Britain RI R2 R3 R4 RS RO 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 source with transformer balanced output INT POWER Amp switch to alt
23. ode V Power Monoblock amplifier Speaker R Speaker L AM 77 Master AM 77 Slave Interconnect Cable Interconnect Cable 46 SN PI S 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 RS 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 47 Figure 5 0 Mode VI Power Bi amplifier mode Speaker R Speaker L CO Power Int Amp Amp AM 77 Master AM 77 Slave Interconnect Cable Interconnect Cable 48 SN PI S 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 RS to the left 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 pro
24. ong 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 On placement With a total 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 horizontal position only Keep the component and compact discs away from equipment with strong magnets such as microwave ovens or large loudspeakers Do not place heavy objects on the component 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
25. ors to be connected to the AM 77 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 21 Figure 2 3 RC2 Figure 2 3 RC3 Figure 2 3 RC4 Figure 2 3 RC1 Figure 2 3 RC7 22 12 Remote Commander 77 Standby See Item 2 for details 13 Remote Commander 77 Source See Item 3 for details 14 Remote Commander 77 Volume See It
26. r Different Modes Section 5 Additional Connectivity Sa Input for iPod other portable music players Sb HiFi Pro Switches for Balanced XLR inputs 5c RS232 Options Connector Section 6 Technical Features Appendix Troubleshooting Specifications Notes 31 31 39 50 50 51 52 53 54 55 57 D Section 1 Unpacking and Setup PI Figure 1 1 Front Panel of the AM 77 dl DUAL MONO AMPLIFIER AM 77 Figure 1 2 Rear Panel of the AM 77 FS 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 il RC 77 Remote Commander with 2 x AAA batteries Di 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 Aluminium professional flightcase Please ensure th
27. r 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 amplifier 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 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 57
28. rent config urations with a brief accompanying summary Figure 4 1 Mode I Pre Main Stereo s Standard system with AM 77 as the only amplifier 1st AM 77 Right Speaker 33 Speaker 2nd AM 77 me a a a s Right Speaker 34 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 Figure 4 3 Mode III Pre Main Bi Amplifier Need 2 or more AM 77s Drive speakers that have more than one set of terminal connections with improved perform 1st AM 77 Left ance and dynamic range me a phhLhbhPhRItAItPhrr 6 Speaker Virtually all the power supply power is availa ble to the low frequency channel with improved channel separation Right gt sl sl Speaker 35 Figure 4 4 Mode IV Power Stereo L Left Speaker 1st AM 77 Right Speaker Same as Mode except the Pre Amplifier sec tion has been bypassed A separate pre amplifier is needed to control the volume 36 Sh yy Figure 4 5 Mode V Power Monoblock Same as Mode Il except the Pre Amplifier sec tion has been bypassed A separate pre amplifier is needed to control the volume 1st AM 77 Left D D D D lt Speaker
29. this button again the AM 77 will initiate the warm up mode to prepare for operation 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 19 Beware pro longed listening at high volume levels is likely to damage your 20 hearing 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 Section 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 connect
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