Abbingdon Music Research Dual Mono Pre-Main Amplifier AM-77 Bedienungsanleitung
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Inhaltsverzeichnis der Gebrauchsanleitungen
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Seite 1
AM-77 Reference Class Dual-Mono Pre-Main Amplifier Owner ’ s Manual[...]
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Seite 2
2[...]
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Seite 3
3 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 W ARNING: Changes[...]
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Seite 4
4 This products complies with the EMC Directive (89/336/EEC) and the Low V oltage 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 internat ional standards and regulations): o EN55022 (CISPR 22) - Electrom[...]
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Seite 5
5 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[...]
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Seite 6
6 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 componen[...]
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Seite 7
7 On placement W ith 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 th[...]
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Seite 8
8 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. T o prevent fire or shock hazard, do not place vessels filled with liquids, such as vases, on the component. T ouch-Sensitive Buttons On the front fascia of this AMR com[...]
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Seite 9
9 Content s W ARNINGS 5 Section 1 - Unp acking and Setup 11 1a. Unp acking 1 2 1b. Setup Section 2 - Component Overview 15 2a. St art-Up Section 3 - Advanced Features 25 3a. Labeling of Input s and Setting Level Offset 2 5 3b. Setting Fixed Input Level 2 8 3c. OptiMains® Protection for Excessive Under/Over-V olt ages 3 0 3d. OptiProtect® Speaker [...]
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Seite 10
10 Section 4 - System Configurations 33 4a. OptiOperation® Different System Configurations 3 3 4b. Switching and Connection Diagrams for Different Modes 4 1 Section 5 - Additional Connectivity 53 5a. Input for iPod/other port able music players 5 3 5b. ‘HiFi/Pro’ Switches for Balanced XLR input s 5 4 5c. RS232 ‘Options’ Connector 5 5 Secti[...]
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Seite 11
11 Figure 1.1 - Front Panel of the AM-77 DUAL MONO AMPLIFIER AM 77 - - Section 1 - Unp acking and Setup Figure 1.2 - Rear Panel of the AM-77 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[...]
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Seite 12
12 Thank you for purchasing this AMR reference class component. W e hope you derive as much pleasure from using this component as we have enjoyed making it for you. 1a. Unp acking This section refers to the unpacking of the AM-77 and its subsequent setup. Upon unpacking, please find: i. AM-77 Refer ence Class Dual-Mono Pr e-Main Amplifier . ii. RC-[...]
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Seite 13
13 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[...]
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Seite 14
14 Figure 1.3 - System connection using banana plug/spade connector equipped speaker cables Figure 1.4 - System connection using Speakon connector equipped speaker cables i. Connect the r espective spade/banana/Speakon connectors of the speaker cables to the AM-77. ii. Connect the sour ce/s via the respective left and right XLR or RCA connectors to[...]
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Seite 15
15 Figure 2.1 - AM-77 Front Fascia F5 F4 F3 F2 F1 DUAL MONO AMPLIFIER AM 77 - - Section 2 - Component Overview F1. ST ANDBY switch: to place the AM-77 in active or standby mode. F2. SOURCE selection buttons: to select between the 5 differ ent inputs. F3. VOLUME buttons: to adjust the volume level. F4. iPod 3.5 Input Connector: for the connection of[...]
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Seite 16
16 Figure 2.2 - AM-77 Rear Panel R1. SP ADE/BANANA outputs: for connection of standar d termination speaker cables. R2. SPEAKON outputs: for connection of Speakon terminated speaker cables. R3. HIFI/PRO switch: to allow for a sour ce with transformer balanced output*. R4. INT/POWER Amp switch: to alternate between Pr e-Main and Power Amplification [...]
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Seite 17
17 R7. INPUTS 2-5: RCA inputs, for signal input of source equipment. R8. SYNC connectors: for connection of mor e than one AM-77*. R9. RS232 option connector: to facilitate futur e upgrades*. R10. Infra-Red Link: for connection of a wir eline remote contr ol. R1 1. IEC power connector: for the connection of a PC-77 mains power cable to the AM-77. R[...]
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Seite 18
18 Figure 2.3 - RC-77 Remote Control REMOTE COMMANDER RC - 77 kHz IN VOL Amplifier CD Processor RC4 RC3 RC1 RC6 RC2 RC5 RC7 RC1. MENU button: to enter Advanced Featur es mode*. RC2. ST ANDBY button: to place the AM-77 in active or standby mode. RC3. SOURCE selection buttons: to select between the 5 differ ent inputs. RC4. VOLUME buttons: to adjust [...]
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Seite 19
19 2a. St art-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. T o switch the mains power OFF , press again and release. Always W AIT at least 30 seconds before switching ON again. This is to enable the OptiMains ® circuit to shutdown properly . The display will light up to [...]
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Seite 20
20 2. Standby After start-up, pressing the ST ANDBY button (F1) on either the front fascia or the RC-77 (RC2), the AM-77 will switch to ST ANDBY mode. Standby 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. CD Player -36dB W ith PLA Y selected from a connected sour[...]
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Seite 21
21 4. V olume 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 [...]
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Seite 22
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 f[...]
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Seite 23
23 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 Featur es 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 - Adva[...]
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Seite 24
24[...]
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Seite 25
25 The following section provides instructions to access the AM-77’s advanced features. 3a. Labeling of Input s and Setting Level Offset W ith 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 [...]
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Seite 26
26 List of available inputs: 1. Input X ( default ) 2. Aux I 3. Aux II 4. Aux III 5. CD Processor 6. D/A Processor 7. DVD Player 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 2[...]
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Seite 27
27 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. Pr ess ‘MENU’ (RC1) on the RC-77. ii. The display will flash ‘Labelling Input 1’. iii. The 2 nd line of the display will comm[...]
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Seite 28
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 0.775V (0dbu) or 1.55V (+6dBu). This allows the 2-Channel music sy[...]
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Seite 29
29 - Having entered the ‘Fixed Input’ menu, now select: Fixed Input 1.55V = +6dBu or Fixed Input 0.775V = 0dBu W arning! By selecting Home Theater Dir ect mode, the volume of the amplifier will be switched to full. Hence if it is used incorr ectly , it will damage the connecting speakers. AMR assumes no r esponsibility for any speaker damage ar[...]
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Seite 30
30 3c. OptiMains ® Protection for Excessive Under/Over-V olt ages 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 problems without Opti- Mains ® ). In almost every country throughout the world, inst[...]
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Seite 31
31 3d. OptiProtect® Speaker Overload Protection W ithin OptiPr otect ® 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 acro[...]
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Seite 32
32[...]
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Seite 33
33 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[...]
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Seite 34
34 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 cr ossover to drive a fully-active 3-way speaker system to the highest possible level of sound r eproduction or; - 3xAM-77s synchr onised for a multi-channel surround sound system[...]
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Seite 35
35 Figure 4.1 - Mode I: Pre-Main Stereo • Standard system with AM-77 as the only amplifier . L Pr e Am p (L ) 1st A M -77 Power Am p (R ) Power Am p (L ) Left Speaker Right Speaker Pr e Am p (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 su[...]
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Seite 36
36 • Need 2 or more AM-77s. • Drive low impedance speakers that only have one set of terminal connections. • ~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 Pr e Am p (L ) 1st A M -77 Po wer Am p (R ) Po wer Am [...]
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Seite 37
37 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 per- formance and dynamic range. • V irtually all the power supply power is avail- able to the low frequency channel with imp- proved channel separation. L Pr e Am p (L ) 1st A M -77 Po we[...]
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Seite 38
38 Figure 4.4 - Mode IV: Power Stereo • Same as Mode I, except the Pre-Amplifier s e c tion has been bypassed. • A separate pre-amplifier is needed to control the volume. L 1st A M -77 Po w er Am p (R ) Po w er Am p (L ) Le f t Sp ea ker Right Sp ea ker R (L ) (R )[...]
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Seite 39
39 Figure 4.5 - Mode V: Power Monoblock • Same as Mode II, except the Pre-Amplifier section has been bypassed. • A separate pre-amplifier is needed to control the volume. L 1st A M -77 Po wer Am p (R ) Po wer Am p (L ) R 2nd AM-7 7 Po wer Am p (R ) Po wer Am p (L ) Le ft Sp e aker Right Sp e aker (L ) (L )[...]
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Seite 40
40 • Same as Mode III, except the Pre-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 A M -77 Po wer Am p (R ) Po wer Am p (L ) R 2nd AM-7 7 Po wer Am p (R ) Po wer Am p (L ) Le ft Sp e aker Right Sp e aker (L ) (L )[...]
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Seite 41
41 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) This is the factory default setting: the connection for which has been described in detail in Section 1 - Unpack- ing and Se[...]
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Seite 42
42 Figure 4.8 - Mode II: Pre-Main Monoblock amplifiers HiFi Pro Mode Int Amp Power Amp L R M M Analog Outputs Analog Outputs R L USB Input IR Link Power On Off 90V 135V 190V 260V ~ AC IN CLASS 1 LASER PRODUCT NoUser Serviceable Components Inside . , . . Forservice contact your Authorised Dealeror Distributor Any modifications to thisequipment wil[...]
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Seite 43
43 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 fr om the ‘Sync Out’ connector (R8) of the ‘master’ amplifier to the ‘Sync In’ connector (R8) of the ‘slave’ amplifier . The amplifier with the cab[...]
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Seite 44
44 Figure 4.8 - Mode III: Pre-Main Bi-amplifier (horizontal bi-amping) Analog Outputs Analog Outputs R L USB Input IR Link Power On Off 90V 135V 190V 260V ~ AC IN CLASS 1 LASER PRODUCT No User Serviceable Components Inside . , . . For service contact your Authorised Dealer or Distributor Any modifications to this equipment will void all warrantie[...]
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Seite 45
45 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 fr om the ‘Sync Out’ connector (R8) of the ‘master ’ amplifier to the ‘Sync In’ connector (R8) of the ‘slave’ amplifier . The amplifier with the ca[...]
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Seite 46
46 Figure 4.9 - Mode IV: Power Stereo amplifier HiFi Pro Mode Int Amp Power Amp L R M Speaker Cable Speaker Cable Interconnect Cable 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 Service[...]
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Seite 47
47 i. Power OFF via the ‘POWER’ (R12) switch at the r ear of the AM-77. ii. Connect the desir ed separate pr e-amplifier to the AM-77 via the Balanced or RCA female connector of Input 1 (R6). iii. Using a small flat blade scr ewdriver , move the ‘MODE’ switch (R5) to the centr e to select ‘L R’. iv . Using a small flat blade scr ewdrive[...]
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Seite 48
48 Figure 4.9 - Mode V: Power Monoblock amplifier HiFi Pro Mode Int Amp Power Amp L R M M Speaker Cable Interconnect Cable 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 Compo[...]
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Seite 49
49 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 scr ewdriver , 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)[...]
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Seite 50
50 Figure 5.0 - Mode VI: Power Bi-amplifier mode HiFi Pro Mode L R M M Speaker Cable Interconnect Cable 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 . , . [...]
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Seite 51
51 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 scr ewdriver , move the ‘MODE’ switch (R5) to the right to select ‘MM’. iii. Using a small flat blade scr ewdriver , move the ‘INT/POWER AMP’ switch ([...]
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Seite 52
52[...]
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Seite 53
53 5a. Input for iPod/other port able music players Section 5 - Additional Connectivity 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. T o select this source, change selection to Input 4 (disconnect any RCA connection to Inpu[...]
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Seite 54
54 5b. ‘HiFi/Pro’ Switches for Balanced XLR inputs 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 trans[...]
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Seite 55
55 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. For future upgrades Power On Off Sync Balanced Input Designed and Engineered in Great Britain Dual Mono Amplifier AM 77 - + + _ _ 90V 13[...]
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Seite 56
56[...]
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Seite 57
57 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 [...]
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Seite 58
58 Appendix - T roubleshooting Figure A.1 Troubleshooting Guide Symptom Possible cause Solution W ith power ON • poor/no power plug connection • insert the power plug firmly into the AC no power is registered at mains power point • blown fuse at mains plug • check and change mains plug fuse No sound • incorrect audio cable connections •[...]
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Seite 59
59 Figure S.1 - Specifications T able Inputs: 5 x R CA 1 x XLR Bal. shared with 1 RCA 1 x iPod® shared with 1 RCA V olume Control: -71dB – 0dB in 1dB steps + Mute Input Sensitivity (IHF 2.83V Out)/Impedance: < 0.05V / > 20KOhm Power Output (see Notes) IHF Dynamic Power: 270 watts per channel at 4 or 8 ohm (stereo mode) 330 watts per channe[...]
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Seite 60
60 ...continued Monoblock option An unlimited number of AM-77s can synchronised Thermionic Electron V alves 5687/6900 (NOS): amplification stage Power Transformer: 1200 V A Custom Double C-Core Power consumption: Standby: 50 W Power on: 95 W at rated output (4R): 1000 W Power Supply Capacitance: 96,000uF in total Rated voltage: 9 0 V -135V & 19[...]
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Seite 61
61 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 tr[...]