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Abbingdon Music Research Dual Mono Pre-Main Amplifier AM-77, Owner'S Manual, Page: 10 / 61

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Abbingdon Music Research Dual Mono Pre-Main Amplifier AM-77 Owner'S Manual Download Page 10

10

Section 4 - System Configurations

33

4a. OptiOperation® Different System Configurations

33

4b. Switching and Connection Diagrams for Different Modes

41

Section 5 - Additional Connectivity

53

5a. Input for iPod/other portable music players

53

5b. ‘HiFi/Pro’ Switches for Balanced XLR inputs

54

5c. RS232 ‘Options’ Connector

55

Section 6 - Technical Features

57

Appendix - Troubleshooting & Maintanence

58

Troubleshooting

58

Maintenance

58

Specifications

59

Summary of Contents for Dual Mono Pre-Main Amplifier AM-77

Page 1: ...AM 77 Reference Class Dual Mono Pre Main Amplifier Owner s Manual ...

Page 2: ...2 ...

Page 3: ...rgy 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 If 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...

Page 4: ... 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 ...

Page 5: ...ay 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 ...

Page 6: ...o 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 pa...

Page 7: ...xcessive dust or mechanical shock Do not place the component in an inclined position It is designed to be operated in a 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 t...

Page 8: ...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 theAM 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 theAM 77 to settle only after it has been used for this approximate ...

Page 9: ...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 ...

Page 10: ...Diagrams for Different Modes 41 Section 5 Additional Connectivity 53 5a Input for iPod other portable music players 53 5b HiFi Pro Switches for Balanced XLR inputs 54 5c RS232 Options Connector 55 Section 6 Technical Features 57 Appendix Troubleshooting Maintanence 58 Troubleshooting 58 Maintenance 58 Specifications 59 ...

Page 11: ...Output L R IR Link L R 1 5 4 3 2 Inputs No User Serviceable Components Inside For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties CAUTION ATTENTION RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Under normal operation set all switches to the default position Please refer to the instruction manual for fur...

Page 12: ...o Pre Main Amplifier ii RC 77 Remote Commander with 2 x AAA batteries 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...

Page 13: ...red in Great Britain LS 77 Professional Monitor Sensitivity Frequency Response Peak Prog Handing Cont Power Handing Impedance 87dB 8Ohms 150W 600W see graph 100 1000 10000 Frequency Hz Frequency Hz 50 60 70 80 90 100 Output dB Output dB HF Level Adjustment Resistor Speaker L Speaker R Interconnect Cable HF LF Designed and Engineered in Great Britain LS 77 Professional Monitor Sensitivity Frequency...

Page 14: ...d Engineered in Great Britain LS 77 Professional Monitor Sensitivity Frequency Response Peak Prog Handing Cont Power Handing Impedance 87dB 8Ohms 150W 600W see graph IN OUT 100 1000 10000 Frequency Hz Frequency Hz 50 60 70 80 90 100 Output dB Output dB HF Level Adjustment Resistor HF LF Designed and Engineered in Great Britain LS 77 Professional Monitor Sensitivity Frequency Response Peak Prog Han...

Page 15: ... 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 The plastic protective film covering the display may be removed ...

Page 16: ... con nector is in contact with the chassis Power On Off Sync Balanced Input Designed and Engineered in Great Britain Dual Mono Amplifier AM 77 _ _ 90V 135V 190V 260V AC IN Speaker Output Speaker Output L R IR Link L R 1 5 4 3 2 Inputs No User Serviceable Components Inside For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties CAUTION ...

Page 17: ...to the AM 77 R12 POWER Switch to switch on mains electricity to the AM 77 In the majority of audio systems theAM 77 is most likely to be operated as a Pre MainAmplifier 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 p...

Page 18: ...TE 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 ...

Page 19: ... 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 O p t i m i s i n g S u p p l y V o l t a g e The display will look like this W a r m i n g U p 45 s The display will then show the remaining warm up ...

Page 20: ...Source Selection From either the front fascia of theAM 77 F2 or the RC 77 RC3 select the desired source input for playback C D P l a y e r 3 6 d B With PLAY selected from a connected source such as a CD 77 playback is attained Once the system check is complete and the OptiMains circuitry has completed its initiation process the AM 77 is ready for operation ...

Page 21: ... of most consequence because first while all 5 inputs can be connected via RCAonly 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 det...

Page 22: ...tailed 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 ref...

Page 23: ... the AM 77 Please refer to Section 3 Advanced Features for a detailed explanation 14 Mute RC 77 only The MUTE button RC5 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 theAM 77 There are 4 different brightness settings including display off With its...

Page 24: ...24 ...

Page 25: ...rleaf 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 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 un...

Page 26: ...layer 8 DVD Recorder 9 HD Recorder 10 HDTV 11 Home Theatre 12 iPod 13 LCD TV 14 Media Center 15 MP3 Player 16 PC Audio 17 Phono Stage 18 Plasma TV 19 Pre Amplifier 20 SACD Player 21 Tape Deck 22 Television 23 Tuner 24 Turntable 25 Uni Player 26 Video Player 27 Home Theatre Direct All types of sources accomodated ...

Page 27: ... 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 I...

Page 28: ...to have a fixed level of Input such as for a home theatre system of either 0 775V 0dbu 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 H o m e T h e a t r e D i r e c t Simultaneously press volume on the front fascia of the AM 77 and OK on ...

Page 29: ...ome 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 HTDmode always use an external pre amp as this mode will switch the AM 77 to full volume ...

Page 30: ... 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 A C V o l t a g e O u t s i d e O p e r a t i n g R a n g e Power OFF your AMR component and wait at least 5 minutes If and wh...

Page 31: ...lure and or extreme levels of over driving the amplifier and speakers When the display shows S p e a k e r P r o t e c t i o n E n g a g e d This indicates that the AM 77 has detected an output condition that could potentially damage the speakers connected to it Normally switching theAM 77 off waiting 20 seconds and switching it back on will reset the protection circuit if the cause was for exampl...

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Page 33: ...t pre main stereo amplifier setting With diverse system permutations in mind theAM 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 M...

Page 34: ... will void all warranties No User Serviceable Components Inside For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties No User Serviceable Components Inside For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties No User Serviceable Components Inside For service contact yo...

Page 35: ...7 as the only amplifier L Pre Amp L 1st AM 77 Power Amp R Power Amp L Left Speaker Right Speaker Pre Amp R R The following pages provide an outline of the theoretical wiring system behind each of the six different config urations with a brief accompanying summary ...

Page 36: ...ctions 600W 2Ohm RMS and 300W 1Ohm RMS without current clipping This is best suited to drive very low impedance speakers Apogee Diva et al Figure 4 2 Mode II Pre Main Monoblock L Pre Amp L 1st AM 77 Power Amp R Power Amp L R Pre Amp L 2nd AM 77 Power Amp R Power Amp L Left Speaker Right Speaker ...

Page 37: ... set of terminal connections with improved per formance and dynamic range Virtually all the power supply power is avail able to the low frequency channel with imp proved channel separation L Pre Amp L 1st AM 77 Power Amp R Power Amp L R Pre Amp L 2nd AM 77 Power Amp R Power Amp L Left Speaker Right Speaker ...

Page 38: ... Mode IV Power Stereo Same as Mode I except the Pre Amplifier sec tion has been bypassed A separate pre amplifier is needed to control the volume L 1st AM 77 Power Amp R Power Amp L Left Speaker Right Speaker R L R ...

Page 39: ...block Same as Mode II except the Pre Amplifier section has been bypassed A separate pre amplifier is needed to control the volume L 1st AM 77 Power Amp R Power Amp L R 2nd AM 77 Power Amp R Power Amp L Left Speaker Right Speaker L L ...

Page 40: ...e Amplifier section has been bypassed A separate pre amplifier is needed to control the volume Figure 4 6 Mode VI Power Bi Amplifier L 1st AM 77 Power Amp R Power Amp L R 2nd AM 77 Power Amp R Power Amp L Left Speaker Right Speaker L L ...

Page 41: ...nd Engineered in Great Britain LS 77 Professional Monitor Sensitivity Frequency Response Peak Prog Handing Cont Power Handing Impedance 87dB 8Ohms 150W 600W see graph 100 1000 10000 Frequency Hz Frequency Hz 50 60 70 80 90 100 Output dB Output dB HF Level Adjustment Resistor Speaker L Speaker R Interconnect Cable HF LF Designed and Engineered in Great Britain LS 77 Professional Monitor Sensitivity...

Page 42: ... 50 60 70 80 90 100 Output dB Output dB HF Level Adjustment Resistor Speaker L Speaker L Power On Off Sync Balanced Input Designed and Engineered in Great Britain Dual Mono Amplifier AM 77 _ _ 90V 135V 190V 260V AC IN Speaker Output Speaker Output L R IR Link L R 1 5 4 3 2 Inputs No User Serviceable Components Inside For service contact your Authorised Dealer or Distributor Any modifications to th...

Page 43: ...nnector 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 Pow...

Page 44: ... In Out Interconnect Cable Speaker R Speaker R Power On Off Sync Balanced Input Designed and Engineered in Great Britain Dual Mono Amplifier AM 77 _ _ 90V 135V 190V 260V AC IN Speaker Output Speaker Output L R IR Link L R 1 5 4 3 2 Inputs No User Serviceable Components Inside For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties CAUT...

Page 45: ...nector 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 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 Po...

Page 46: ...ase refer to the instruction manual for further details bold HiFi Pro Mode Int Amp Power Amp Option SERIAL NO L R M M In Out Interconnect Cable AM 77 AM 77 HF LF Designed and Engineered in Great Britain LS 77 Professional Monitor Sensitivity Frequency Response Peak Prog Handing Cont Power Handing Impedance 87dB 8Ohms 150W 600W see graph 100 1000 10000 Frequency Hz Frequency Hz 50 60 70 80 90 100 O...

Page 47: ... the AM 77 via the Balanced or RCA female connector of Input 1 R6 iii Using a small flat blade screwdriver move the MODE switch R5 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 ...

Page 48: ...onents Inside For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties CAUTION ATTENTION RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Under normal operation set all switches to the default position Please refer to the instruction manual for further details bold HiFi Pro Mode Int Amp Power Amp Option SERIAL ...

Page 49: ...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 ...

Page 50: ...ct your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties CAUTION ATTENTION RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Under normal operation set all switches to the default position Please refer to the instruction manual for further details bold HiFi Pro Mode Int Amp Power Amp Option SERIAL NO L R M In Out Speaker Cable I...

Page 51: ...t 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 ...

Page 52: ...52 ...

Page 53: ... 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 Input 4 DC5V 0 5A DUAL MONO AMPLIFIER AM 77 When the 3 5mm jack is used disconnect the RCA connecion to Input 4 at the rear of the...

Page 54: ...s for the few pre amplifiers that have floating transformer balanced outputs HiFi Pro Mode Int Amp Power Amp L R M Power On Off Sync Balanced Input Designed and Engineered in Great Britain Dual Mono Amplifier AM 77 _ _ 90V 135V 190V 260V AC IN Speaker Output Speaker Output L R IR Link L R 1 5 4 3 2 Inputs No User Serviceable Components Inside For service contact your Authorised Dealer or Distribut...

Page 55: ...190V 260V AC IN Speaker Output Speaker Output L R IR Link L R 1 5 4 3 2 Inputs No User Serviceable Components Inside For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warranties CAUTION ATTENTION RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Under normal operation set all switches to the default position Please ...

Page 56: ...56 ...

Page 57: ...ome 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 powe...

Page 58: ...t adjust fitting between speaker and chassis connectors in contact with the chassis and and terminal Ensure no contact between chassis and spade terminals no short circuiting Remote control does remote control batteries have replace 2 xAAAbatteries not work expired object obscuring remote sensor on remove any objects directly in front of the AM 77 the AM 77 no line of sight A humming sound loose c...

Page 59: ...nel 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 FTC 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 Output impedance 0 5ohm 20 20 000Hz Frequency Response 1dB 10Hz 50kHz Signal to noise ratio A weighted 100dB Operational Mod...

Page 60: ... consumption Standby 50 W Power on 95 W at rated output 4R 1000 W Power Supply Capacitance 96 000uF in total Rated voltage 90V 135V 190V 260VAC Colour Champagne or Titanium Dimensions 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 Weight AM 77 75 lbs 34 kg Shipped 121 lbs 55 kg Information and specifications subject to change without notice ...

Page 61: ... 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 Hi...

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