Univex AM-77 User Manual

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AM-77 Reference Class

Dual-Mono Pre-Main Amplifier

Owner’s Manual

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. 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 the interference by one or more of the following measures:

- 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 numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

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

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 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 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

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

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.

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 . 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.

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 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. 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 electrolytic 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.

Content s

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 2 5 3b. Setting Fixed Input Level 28 3c. OptiMains® Protection for Excessive Under/Over-Voltages 30 3d. OptiProtect® Speaker Overload Protection 31

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

Section 1 - Unpacking and Setup

～

Figure 1.1 - Front Panel of the AM-77

DUAL MONO AMPLIFIER AM 77

Figure 1.2 - Rear Panel of the AM-77

Speaker

Output

HiFi

Under normal operation set all switches to the default position Please refer to

() .

bold

the instruction manual for further details

Balanced

Input

Pro

Mode

Power

Int

Amp

Dual Mono Amplifier AM 77

Designed and Engineered in Great Britain

CAUTION ATTENTION

RISK OF ELECTRIC SHOCK

RISQUE DE CHOC ELECTRIQUE

DO NOT OPEN

NE PAS OUVRIR

Inputs

No User Serviceable Components Inside.

Dealer or Distributor Any modifications to

this equipment will void all warranties

For service contact your Authorised

IR Link

Option

Power

Off

Out

Sync

AC IN

90V 135V

190V

260V

SERIAL

Speaker

Output

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

all contents are

present

i. AM-77 Reference Class Dual-Mono 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. Should an item be missing, please contact your AMR distributor/dealer .

Default pre-main

～

Speaker CableSpeaker Cable

Interconnect Cable

100 1000 10000

FrequencyHz()

100

utp

dB()

Speaker LSpeaker R

Interconnect Cable

100 1000 10000

FrequencyHz()

100

Outp

utdB(

)

CD 77-

～

AM 77-

mode: the AM-77

as an integrated

amplifier

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.

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CLASS1

LASERPRODUCT

NoUserServiceable Components Inside.

Forservice contact your Authorised

DealerorDistributor Anymodificationsto

thisequipmentwill void allwarranties

Sensitivity:

87dB

Impedance:

8Ohms

dB()

ContPowerHanding. :

150W

LevelAdjustment

utp O

PeakProgHanding:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

LS77Professional Monitor

DesignedandEngineered in Great Britain

IN OUT

Speaker Output

Power

Off

Out

Sync

IR Link

Option

Power

Off

ACIN

90V 135V

260V

190V

SERIAL

AC IN

90V 135V

260V

190V

Analog Outputs

SERIAL

Sensitivity:

87dB

)

Impedance:

8Ohms

utdB(

ContPowerHanding. :

150W

LevelAdjustment

Outp

PeakProgHanding:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

LS77Professional Monitor

DesignedandEngineered in Great Britain

Speaker

Output

IN OUT

Balanced

Input

Pro

HiFi

Power Amp

Undernormal operation setall switches to

bold

() .

thedefault positionPlease refer to theinstruction manual forfurther details

Mode

Int Amp

Designedand Engineered in Great Britain

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRICSHOCK

NEPAS OUVRIR

DONOT OPEN

Dual Mono Amplifier AM 77

AM 77-

Analog Outputs

R L

Designedand Engineered in GreatBritain

USBInput

IRLink

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRIC SHOCK

DONOT OPEN

CD 77-

Inputs

CompactDisk Processor CD77

NEPAS OUVRIR

Mode

Pro

Warning: ensure

no speaker

HiFi

connector is in contact with the chassis to cause

a short-circuit!

Power

Amp

Int

Amp

Figure 1.3 - System connection using banana plug/spade connector equipped speaker cables

～

CD 77-

Speaker CableSpeaker Cable

Interconnect Cable

100 1000 10000

FrequencyHz()

100

Out

tdB(

)

100 1000 10000

FrequencyHz()

100

utpu

tdB()

Speaker LSpeaker R

～

AM 77-

Interconnect Cable

AMR recom-

mends the

sonically supe-

rior Speakon

HiFi

Pro

Sensitivity:

87dB

)

Impedance:

8Ohms

tdB(

ContPowerHanding. :

150W

LevelAdjustment

Out

PeakProgHanding:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

LS77Professional Monitor

DesignedandEngineered in Great Britain

IN OUT

Sensitivity:

87dB

Impedance:

8Ohms

tdB()

ContPowerHanding. :

150W

LevelAdjustment

utpu O

PeakProgHanding:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

LS77Professional Monitor

DesignedandEngineered in Great Britain

IN OUT

connectors

Speaker

Mode

Output

Int

Amp

Power

Amp

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 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.

Balanced

Input

Pro

HiFi

Power

Amp

Undernormal operation setall switches to

bold

() .

thedefault positionPlease refer to theinstruction manual forfurther details

Mode

Int

Amp

Designeda nd Engineered in Great Britain

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRICSHOCK

NEPAS OUVRIR

DONOT OPEN

Dual Mono Amplifier AM 77

AM 77-

Analog Outputs

R L

Designedand Engineered in GreatBritain

USBInput

IRLink

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRIC SHOCK

DONOT OPEN

CD 77-

Inputs

CompactDisk Processor CD77

NEPAS OUVRIR

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CLASS1

LASERPRODUCT

NoUserServiceable Components Inside.

Forservice contact your Authorised

DealerorDistributor Anymodificationsto

thisequipmentwill void allwarranties

Out

Sync

IR Link

Option

Power

Off

ACIN

90V 135V

260V

190V

Speaker

Output

Power

Off

AC IN

90V 135V

260V

190V

Analog Outputs

SERIAL

The plastic

protective film

covering the

display may be

removed

Section 2 - Component Overview

Figure 2.1 - AM-77 Front Fascia

DUAL MONO AMPLIFIER AM 77

F1. 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.

Warning: en-

～

sure no speaker connector is in contact with the chassis

Figure 2.2 - AM-77 Rear Panel

Speaker

Output

Under normal operation set all switches to the default position Please refer to the instruction manual for further details

HiFi

() .

bold

Power

Balanced

Input

Pro

Mode

Int

Amp

CAUTION ATTENTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Dual Mono Amplifier AM 77

Designed and Engineered in Great Britain

Inputs

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

No User Serviceable Components Inside.

Dealer or Distributor Any modifications to

this equipment will void all warranties

For service contact your Authorised

Speaker

SERIAL

Output

Power

90V 135V

190V

AC IN

Off

260V

Out

Sync

IR Link

Option

R10

R11

R12

R1. SPADE/BANANA outputs: for connection of standard termination speaker cables. R2. SPEAKON outputs: for connection of Speakon terminated speaker cables. R3. HIFI/PRO switch: to allow for a source with transformer balanced output*. R4. INT/POWER Amp switch: to alternate between Pre-Main and Power Amplification setings*. R5. MODE switch: to alternate between Stereo/Monoblock/Bi-Amplification settings*. R6. 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. 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.

Amplifier

CD Processor

Figure 2.3 - RC-77 Remote Control

RC1

RC2

RC3

REMOTE COMMANDER

kHz

VOL

RC4

RC6

RC5

RC7

RC1. 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. 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.

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.

Once powered

OFF: always wait

30 seconds

before switching

on again

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:

Optimising Supply

Voltage

The display will look like this:

Warming Up

45 s

The display will then show the remaining warm-up time.

Once the system check is complete and the OptiMains®circuitry has completed its initiation process, the AM77 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 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

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

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 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 connectors 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/Monoblock/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.

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 (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 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.

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.

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 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:

Input 1 CD Player (2V output) Offset: 0dB

Input 2 LP (1V output) Offset: +6dB

Input 3 SACD Player (4V output) Offset: -6dB

List of available inputs:

All types of

sources

accomodated

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

24. Turntable

25. Uni Player

26. Video Player

27. Home Theatre Direct

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’ (RC1) 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 ‘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.

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 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:

Home Theatre

Direct

- Simultaneously press ‘-’ volume on the front fascia of the AM-77 and ‘OK’ on the RC-77.

- Having entered the ‘Fixed Input’ menu, now select:

HTD mode:

always use an external pre-amp as this mode will

switch the AM-

77 to full volume!

Fixed Input 1.55V = +6dBu

Fixed Input 0.775V = 0dBu

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.

Sometimes there

are excessive

mains fluctua-

tions

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 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:

...OptiMains®

will detect and

protect

AC Voltage Outside

Operating Range!

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.

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 extreme levels of over-driving the amplifier and speakers. When the display shows:

If there are any

questions, please

contact your

nearest AMR

distributor/dealer

Speaker Protection

Engaged!

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 of f, 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.

It is assumed all

prior sections

have been read &

understood with

all requisite

connections

made

Six different

modes

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 singlechannel 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 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)

Supreme adapt-

ability

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.

In short, the AM-77’ s flexibility is limited only to that of the imagination. For example, one may employ:

- -

～

- -

AM-77 AM-77

- 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, AL-

WAYS ensure

Speaker

Output

R R

HiFi

Power Amp

Undernormal operation setall switches to

() .

bold

thedefault positionPlease refer to theinstruction manual forfurther details

Balanced

Input

Pro

Mode

Int

Amp

Dual Mono Amplifier AM 77 Dual Mono Amplifier AM 77

Designedand Engineered in Great Britain

Inputs

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRICSHOCK

NEPAS OUVRIR

DONOT OPEN

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

Out

Sync

IR Link

Option

Speaker

Output

Power

Off

L L

AC IN

90V 135V

260V

190V

SERIAL

Speaker

Output

Undernormal operation setall switches to thedefault positionPlease refer to theinstruction manual forfurther details

() .

bold

Balanced

Input

Pro

HiFi

Mode

Power

Int

Amp

Designedand Engineered in Great Britain

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRICSHOCK

NEPAS OUVRIR

DONOT OPEN

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

Speaker Output

Power

Off

Out

Sync

IR Link

Option

AC IN

90V 135V

260V

190V

SERIAL

the AM-77 is

switched OFF

Speaker

Output

Pro

HiFi

Mode

R R

Int

Power

Amp

Undernormal operation setall switches to

() .

bold

thedefault positionPlease refer to

theinstruction manual forfurther details

Balanced

Input

Dual Mono Amplifier AM 77 Dual Mono Amplifier AM 77

Designedand Engineered in Great Britain

Inputs

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRICSHOCK

NEPAS OUVRIR

DONOT OPEN

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

Out

Sync

IR Link

Option

Speaker

Output

Power

Off

L L

AC IN

90V 135V

260V

190V

SERIAL

Speaker

Output

Pro

HiFi

Mode

Power

Int

Amp

Undernormal operation setall switches to

() .

bold

thedefault positionPlease refer to

theinstruction manual forfurther details

Balanced

Input

CAUTION ATTENTION

RISKOF ELECTRICSHOCK

Designedand Engineered in Great Britain

RISQUEDE CHOC ELECTRIQUE

NEPAS OUVRIR

DONOT OPEN

Speaker Output

Power

Off

Out

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

Sync

IR Link

Option

AC IN

90V 135V

260V

190V

SERIAL

The following pages provide an outline of the theoretical wiring system behind each of the six different configurations with a brief accompanying summary

Figure 4.1 - Mode I: Pre-Main Stereo

Pre

Amp

(L)

Power

Amp

(L)

Left

Speaker

• Standard system with AM-77 as the only amplifier.

Pre

Amp

(R)

Power

Amp

(R)

1st AM-77

Right

Speaker

Figure 4.2 - Mode II: Pre-Main Monoblock

Pre

Amp

(L)

Power

Amp

(L)

Power

Amp

(R)

• Need 2 or more AM-77s.

• Drive low impedance speakers that only have one set of terminal connections.

1st AM-77

Left

Speaker

• ~600W/2Ohm RMS and ~300W/1Ohm RMS without current clipping. This is best suited

to drive very low impedance speakers

Pre

Amp

(L)

Power

Amp

(L)

Power

Amp

(R)

2nd AM-77

Right

Speaker

(Apogee Diva et al).

Figure 4.3 - Mode III: Pre-Main Bi-Amplifier

Pre

Amp

(L)

Power

Amp

(L)

• Need 2 or more AM-77s.

Power

Amp

(R)

• Drive speakers that have more than one set of terminal connections with improved per-

1st AM-77

Left

Speaker

formance and dynamic range.

• Virtually all the power supply power is available to the low frequency channel with impproved channel separation.

Pre

Amp

(L)

Power

Amp

(L)

Power

Amp

(R)

2nd AM-77

Right

Speaker

Figure 4.4 - Mode IV: Power Stereo

(L)

Power

Amp

(L)

Left

Speaker

• Same as Mode I, except the Pre-Amplifier

sec tion has been bypassed.

• A separate pre-amplifier is needed to control the volume.

(R)

Power

Amp

(R)

1st AM-77

Right

Speaker

Figure 4.5 - Mode V: Power Monoblock

(L)

Power

Amp

(L)

• Same as Mode II, except the Pre-Amplifier

Power

Amp

(R)

1st AM-77

(L)

Power

Amp

(L)

Power

Amp

(R)

2nd AM-77

Left

Speaker

Right

Speaker

• A separate pre-amplifier is needed to control

section has been bypassed.

the volume.

Figure 4.6 - Mode VI: Power Bi-Amplifier

(L)

Power

Amp

(L)

• Same as Mode III, except the Pre-Amplifier

Power

Amp

(R)

1st AM-77

(L)

Power

Amp

(L)

Power

Amp

(R)

2nd AM-77

Left

Speaker

Right

Speaker

• A separate pre-amplifier is needed to control

section has been bypassed.

the volume.

4b. Switching and Connection Diagrams for Different Modes

～

Speaker CableSpeaker Cable

Interconnect Cable

100 1000 10000

FrequencyHz()

100

utpu

dB()

Speaker LSpeaker R

Interconnect Cable

100 1000 10000

FrequencyHz()

100

OutputdB()

CD 77-

～

AM 77-

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)

The default

factory setting

HiFi

Pro

Sensitivity:

87dB

Impedance:

8Ohms

ContPowerHanding. :

150W

LevelAdjustment

OutputdB()

PeakProgHanding:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

LS77Professional Monitor-

DesignedandEngineeredin GreatBritain

IN OUT

Sensitivity:

87dB

Impedance:

8Ohms

dB() t

ContPowerHanding. :

150W

LevelAdjustment

utpu O

PeakProgHanding:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

LS77Professional Monitor-

DesignedandEngineeredin GreatBritain

IN OUT

Speaker

Mode

Output

HiFi

Power

Amp

Undernormal operation setall switches to

bold

() .

thedefault positionPleaserefer to theinstruction manual forfurther details

Balanced

Input

Pro

Mode

Int

Amp

Designedand Engineered in Great Britain

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOF ELECTRICSHOCK

NEPAS OUVRIR

DONOT OPEN

Dual Mono Amplifier AM 77

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

Out

Sync

IRLink

Option

Speaker Output

Power

Off

ACIN

90V 135V

260V

190V

SERIAL

AM 77-

Amp

Int

Amp

Power

This is the factory default setting: the connection for which has been described in detail in Section 1 - Unpacking 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.

Analog Outputs

R L

CompactDisk Processor CD77

Designedand Engineered in GreatBritain

USBInput

IRLink

CAUTION ATTENTION

RISQUEDE CHOC ELECTRIQUE

RISKOFELECTRIC SHOCK

NEPAS OUVRIR

DONOT OPEN

CLASS1

LASERPRODUCT

NoUserServiceable Components Inside.

Forservicecontact yourAuthorised

DealerorDistributor Anymodificationsto

thisequipmentwill void allwarranties

Power

Off

ACIN

90V 135V

260V

190V

CD 77-

Analog Outputs

SERIALNO.

Figure 4.8 - Mode II: Pre-Main Monoblock amplifiers

HiFi

Pro

Mode

Int

Amp

Power

Amp

Analog Outputs

R L

USBInput

IRLink

Power

Off

90V 135V

190V

260V

～

ACIN

CLASS1

LASERPRODUCT

NoUserServiceable Components Inside.

Forservice contact your Authorised

DealerorDistributor Anymodificationsto

thisequipmentwill void allwarranties

CAUTION ATTENTION

RISKOF ELECTRIC SHOCK

DONOT OPEN

RISQUEDE CHOC ELECTRIQUE

NEPAS OUVRIR

SERIAL

Designedand Engineered in GreatBritain

CompactDisk Processor CD77

CD 77-CD 77-

Speaker Cable

Interconnect Cable

AM-77: MasterAM-77: Master

Interconnect Cable

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProgHanding:.

ContPowerHanding. :

Impedance:

87dB 8Ohms 150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()FrequencyHz()

100

OutputdB()OutputdB()

LevelAdjustment

Resistor

Speake

AM-77: SlaveAM-77: Slave

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProgHanding:.

ContPowerHanding. :

Impedance:

87dB

8Ohms

150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()FrequencyHz()

100

tputd

(

)Ou

tputd

(

)

LevelAdjustment

Resistor

Speaker

Power

Off

Sync

Balanced

Input

Designedand Engineered in Great Britain

Dual Mono Amplifier AM 77

90V 135V

190V

260V

～

AC IN

Speaker Output

Speaker

Output

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRICSHOCK

DONOT OPEN

RISQUEDE CHOC ELECTRIQUE

NEPAS OUVRIR

() .

Undernormal operation setall switches to thedefault positionPlease refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int Amp

Power

Amp

Option

SERIAL

Out

Speaker Cable

Synchronisation Cable

Power

Off

Sync

Balanced

Input

Designedand Engineered in Great Britain

Dual Mono Amplifier AM 77

90V 135V

190V

260V

～

AC IN

Speaker

Output

Speaker

Output

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRICSHOCK

DONOT OPEN

RISQUEDE CHOC ELECTRIQUE

NEPAS OUVRIR

() .

Undernormal operation setall switches to thedefault positionPlease refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int

Amp

Power

Amp

Option

SERIAL

Out

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).

Figure 4.8 - Mode III: Pre-Main Bi-amplifier (horizontal bi-amping)

Analog Outputs

R L

USBInput

IRLink

Power

Off

90V 135V

190V

260V

～

ACIN

CLASS1

LASERPRODUCT

NoUserServiceable ComponentsInside.

Forservice contact your Authorised

DealerorDistributor Anymodificationsto

thisequipmentwill voidallwarranties

CAUTION ATTENTION

RISKOF ELECTRIC SHOCK

DONOT OPEN

RISQUEDE CHOC ELECTRIQUE

NEPAS OUVRIR

SERIAL

Designedand Engineered in GreatBritain

CompactDisk Processor CD77

HiFi

Pro

Mode

Int

Amp

Power

Amp

CD Player

Speaker Cable

Interconnect Cable

Power

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

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRICSHOCK

DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

() .

Undernormal operation setall switchesto thedefault positionPlease refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int

Amp

Power

Amp

Option

SERIAL

Out

Interconnect Cable

Speake

Power

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

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRICSHOCK

DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

() .

Undernormal operation setall switchesto thedefault positionPlease refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int Amp

Power

Amp

Option

SERIAL

Out

Speaker

Speaker Cable

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProgHanding:.

ContPowerHanding. :

Impedance:

87dB

8Ohms

150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()Frequency Hz()

100

utput

(

utput

(

)

LevelAdjustment

Resistor

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProgHanding:.

ContPowerHanding. :

Impedance:

87dB 8Ohms 150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()Frequency Hz()

100

OutputdB()OutputdB()

LevelAdjustment

Resistor

Synchronisation Cable

Speaker CableSpeaker Cable

AM-77: MasterAM-77: Master AM-77: SlaveAM-77: Slave

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 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).

Figure 4.9 - Mode IV: Power Stereo amplifier

Speaker CableSpeaker Cable

Interconnect Cable

～

Interconnect Cable

AM 77-

100 1000 10000

FrequencyHz()

100

OutputdB()

Speaker LSpeaker R

100 1000 10000

FrequencyHz()

100

utputdB()

Pre-amplifier

Forservice contact your Authorised

Sensitivity:

87dB

Impedance:

8Ohms

ContPower Handing. :

150W

LevelAdjustment

OutputdB()

PeakProg Handing:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

LS77 Professional Monitor

DesignedandEngineered inGreatBritain

IN OUT

Speaker

Power

Out

Sync

IR Link

Option

AC IN

90V 135V

190V

Analog Outputs

Output

Off

260V

SERIAL

Sensitivity:

87dB

Impedance:

8Ohms

ContPower Handing. :

150W

LevelAdjustment

utputdB() O

PeakProg Handing:.

600W

Resistor

FrequencyResponse:

()seegraph

FrequencyHz()

HiFi

Mode

Power

Amp

Int

Amp

Pro

Speaker Output

HiFi

Mode

Power

Amp

Undernormal operation set all switches to

bold

() .

thedefault position Please refer to theinstruction manual for further details

LS77 Professional Monitor

DesignedandEngineered inGreatBritain

IN OUT

Int Amp

Pro

Balanced

Input

CAUTION ATTENTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

Analog

Outputs

Dual Mono Amplifier AM 77

Designed and Engineered in Great Britain

Inputs

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

AM 77-

NoUser Serviceable Components Inside.

Dealeror Distributor Any modifications to

thisequipment will void all warranties

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 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).

Figure 4.9 - Mode V: Power Monoblock amplifier

HiFi

Pro

Mode

Int

Amp

Power

Amp

Speaker Cable

Interconnect Cable

Power

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

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRICSHOCK

DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

() .

Undernormal operation setall switchesto thedefault positionPlease refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int

Amp

Power

Amp

Option

SERIAL

Out

Interconnect Cable

Power

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

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Anymodifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRICSHOCK

DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

() .

Undernormal operation setall switchesto thedefault positionPlease refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int Amp

Power

Amp

Option

SERIAL

Out

Speaker Cable

AM-77: MasterAM-77: Master AM-77: SlaveAM-77: Slave

Pre-amplifier

Analog Outputs

Pre-amplifier

Speake

Speaker

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProgHanding:.

ContPowerHanding. :

Impedance:

87dB

8Ohms

150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()Frequency Hz()

100

Outpu

(

)

Outpu

(

)

LevelAdjustment

Resistor

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProgHanding:.

ContPowerHanding. :

Impedance:

87dB 8Ohms 150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()Frequency Hz()

100

OutputdB()OutputdB()

LevelAdjustment

Resistor

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).

Figure 5.0 - Mode VI: Power Bi-amplifier mode

HiFi

Pro

Mode

Speaker Cable

Interconnect Cable

Power

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

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Any modifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRIC SHOCK

DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

() .

Undernormal operation set all switches to thedefault position Please refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int

Amp

Power Amp

Option

SERIALNO.

Out

Interconnect Cable

Power

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

IR Link

Inputs

NoUser Serviceable ComponentsInside.

Forservice contactyour Authorised

Dealeror Distributor Any modifications to

thisequipment will voidall warranties

CAUTION ATTENTION

RISKOF ELECTRIC SHOCK

DO NOT OPEN

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

() .

Undernormal operation set all switches to thedefault position Please refer to theinstruction manual forfurther details

bold

HiFi

Pro

Mode

Int

Amp

Power Amp

Option

SERIALNO.

Out

Speaker Cable

Int

Amp

Power

Amp

AM-77: MasterAM-77: Master AM-77: SlaveAM-77: Slave

Speake

Speaker

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProg Handing:.

ContPower Handing. :

Impedance:

87dB 8Ohms 150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()FrequencyHz()

100

Out

tdB(

)

Out

tdB(

)

LevelAdjustment

Resistor

DesignedandEngineered in Great Britain

LS77Professional Monitor

Sensitivity:

FrequencyResponse:

PeakProg Handing:.

ContPower Handing. :

Impedance:

87dB

8Ohms

150W 600W

()seegraph

IN OUT

100 1000 10000

FrequencyHz()FrequencyHz()

100

OutputdB()OutputdB()

LevelAdjustment

Resistor

Speaker CableSpeaker Cable

Pre-amplifier

Analog Outputs

Pre-amplifier

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).

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

5a. Input for iPod/other portable music players

DC5V 0 5A.

Input 4

DUAL MONOAMPLIFIER AM 77

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.

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

～

AM 77-

‘Pro’ switch is for

the few pre-

amplifiers that

have floating

transformer

balanced outputs

HiFi

Mode

Pro

Speaker

Output

Undernormal operation set all switches to thedefault position Please referto theinstruction manualfor further details

bold

() .

Balanced

Input

Pro

HiFi

Mode

Int

Power Amp

Amp

Designed and Engineered in Great Britain

CAUTION ATTENTION

RISQUE DE CHOC ELECTRIQUE

RISKOF ELECTRIC SHOCK

NE PAS OUVRIR

DO NOT OPEN

Dual Mono Amplifier AM 77

Inputs

NoUser ServiceableComponents Inside.

Forservice contact your Authorised

Dealeror Distributor Any modifications to

thisequipment willvoid all warranties

Out

Sync

IR Link

Option

190V

Power

90V 135V

Speaker

Output

Off

AC IN

260V

SERIALNO.

AM 77-

Power

Amp

For the majority of sources, the HiFi/Pro switch (R3) is best left in the ‘HiFi’ position. However, if the source has

Int

Amp

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 & 3, thus establishing the ground connection.

For future

～

upgrades

5c. RS232 ‘Options’ Connector

Speaker

Output

Under normal operation set all switches to the default position Please refer to the instruction manual for further details

HiFi

() .

bold

Balanced

Input

Pro

Mode

Power

Int

Amp

Dual Mono Amplifier AM 77

Designed and Engineered in Great Britain

CAUTION ATTENTION

RISQUE DE CHOC ELECTRIQUE

RISK OF ELECTRIC SHOCK

NE PAS OUVRIR

DO NOT OPEN

Inputs

No User Serviceable Components Inside.

For service contact your Authorised

Dealer or Distributor Any modifications to

this equipment will void all warranties

IR Link

Option

Power

Off

Out

Sync

AC IN

90V 135V

260V

190V

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.

Speaker

Output

SERIALNO.

Option

Section 6 - Technical Features

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 patentpending 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 dualmono audio circuit design.

For a more detailed explanation of these and other features, please go to: www.amr-audio.co.uk

Appendix - Troubleshooting

Figure A.1 Troubleshooting Guide

Symptom Possible cause Solution With 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 • connect the sources to the AM-77 correctly

• incorrect amplifier operation • make sure that the input selector on the AM-77 is set to the desired source

Strange ‘blast’ sound • check speaker connectors are not • 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 x AAA batteries 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 cable connections • re-attach the loose cables correctly can be heard

Front switches ‘jump’/ • static electricity • ‘Touch’ the chassis prior to pressing a sensor to dis enter Standby charge. Then press the desired sensor

Other problems • go to the Contents section and re-trace the procedure

or contact your nearest AMR distributor/dealer

Specifications

Figure S.1 - Specifications Table

Inputs: 5 x RC A

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 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: 0.5 ohm, 20 - 20,000 Hz

Frequency Response (-1dB): 10Hz - 50kHz

Signal-to-noise ratio 'A' weighted: >100 dB

Operational Modes: Pre-Main amplifier mode

Power amplifier mode

...continued

Monoblock option An unlimited number of AM-77s can synchronised

Thermionic Electron V alves 5687/6900 (NOS): amplification stage

Power Transformer: 1200 VA 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: 90 V-135V & 190V -260V AC

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.

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 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 likefor-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;

T el: +44 (0) 870 420 5505; Fax: +44 (0) 700 596 1065

Univex AM-77 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual