Perreaux SM6 MKII User Manual

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Prisma SM6 MkII

Balanced Preamplifier

Owners Manual

Perreaux Industries Limited makes no warranty for the use of its products, other than those expressly contained in the warranty detailed herein. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change products or specifications detailed herein at any time without notice, and does not make any commitment to updatethe information contained herein. No licenses to patents or other intellectual property of Perreaux are granted by the Company in connection with the sale of Perreaux products, expressly or by implication.

mboob^ru® is a registered trademark of Perreaux Industries Ltd.

Terms and product names in this document may be trademarks of others.

2

i

Introducing the Perreaux

SM6 MkII Preamplifier

Features at a

Glance

Congratulations on your Perreaux SM6 MkII purchase. To realise the full potential of your unit you need to appreciate all aspects of its operation.

Before installing the SM6 MkII into your system, read the entire manual carefully. Endeavour to understand every detail by familiarising yourself with the controls and features as you read. You will find it easier to install using the relevant sections of this manual as a reference.

We have attempted to explain every feature and operation facet clearly and concisely. Your Perreaux dealer will be happy to assist if you encounter any unforeseen problems.

Read this manual, install your unit correctly and realise the sonic significance of your investment in Perreaux.

Perreaux products are designed to provide the utmost in sonic realism and electronic reliability with a functional yet elegant appearance that reflects the care and craftsmanship applied during all stages of construction.

Rugged build quality

Truly balanced circuit design

Discrete Class-Aamplification throughout

Multiple regulated power supplies

Infrared (IR) full function remote control

Precision volume control

Dual preamplifier outputs

Home theatre bypass

Remote trigger outputs

Advanced PCB design and earthing techniques

To maintain the consistently high quality that you expect from us, and we expect from ourselves, Perreaux products are essentially handcrafted.

We maintain the human-linkthroughout, from design and construction, through to the ultimate test, your music, your system, your ears.

Because we too listen to our products, we know that with your Perreaux you will discover many more of the musical secrets we strive to reveal.

From all of us at Perreaux Industries Limited, thank you for choosing the Perreaux Prisma Series SM6 MkII preamplifier.

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ii Important Safety Instructions

Note: All safety and operation instructions should be read carefully before the SM6 is operated. Keep the Owners Manual in a safe place for future reference.

The SM6 should not be used near water, for example near a bathtub, kitchen sink, in a wet basement, near a swimming pool, etc.

Mounting to a wall or ceiling should be via a heavy-dutybracket or shelf designed for audio equipment use.

The SM6 should be situated away from heat sources such as radiators, stoves, or other appliances that produce excessive amounts of heat.

DO NOT place the SM6 directly onto carpeted surfaces.

Avoid exposing the SM6 to extremely high or low temperatures.

The SM6 should be connected to a mains power supply only of the type described in the operating instructions, or as marked on the rear of the unit.

DO NOT disconnect the mains earth from the system.

The mains power supply cord should be routed so that it is not likely to be walked on or pinched by items placed on or against it.

The power cord of the SM6 should be unplugged from the mains outlet when the unit is to be left unused for long periods or when attempting to connect or disconnect cables and before cleaning your unit.

Care should be taken so that objects and/or liquids do not accidentally fall inside the SM6.

Please keep electrical equipment out of reach of children.

Please unplug sensitive electronic equipment during electrical storms.

Please replace any fuse with the value and type specified.

Avoid operating the SM6 with the cover removed.

DO NOT bypass any fuse.

DO NOT attempt to repair the SM6. In the event of aproblem, please contact your Perreaux dealer.

DO NOT operate this product in an explosive atmosphere.

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iii

Table of Contents

i ii iii 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Introducing the Perreaux SM6 Preamplifier...............................................................

3

Important Safety Instructions ........................................................................................

4

Table of Contents..............................................................................................................

5

Unpacking and Placement..............................................................................................

6

Instant Install......................................................................................................................

7

Front Panel Functions......................................................................................................

9

Rear Panel Functions.....................................................................................................

11

Remote Control Functions...........................................................................................

15

Special Design Philosophies........................................................................................

18

Special Design Features................................................................................................

20

Maximising System Potential ......................................................................................

21

Care and Maintainance................................................................................................

23

Warranty Information and Obtaining Service........................................................

24

Extended Warranty Registration Form....................................................................

25

Faultfinding Your System.............................................................................................

26

Specifications...................................................................................................................

31

Physical Dimensions......................................................................................................

35

Contact Details................................................................................................................

36

5

1 Unpacking and Placement

 

The SM6 is packaged for maximum protection. Please carefully read the

 

instructions below before proceeding to unpack the unit. Be extremely careful.

Unpacking

 

Inspect both ends of the cardboard box and open at the end without the

Procedure

 

central staple by slitting the reinforced tape at either side.

 

Fold back the flaps and tip thepackage on end and the inner box will

 

 

slide out.

 

 

Lay the inner box down flat and upright, open it conventionally by

 

 

separating the top tray from the bottom.

 

The product can now be removed from the bottom packaging. This will

 

 

be easier if you have someone to help you by holding the base of the

 

 

box.

 

 

Alternately, the bottom tray and preamplifier could be tipped upside

 

 

down and the bottom packaging removed. If opened in this manner,

 

 

please ensure that you turn the contents over again.

 

 

Note: Be very careful to secure the unit if you are planning to flip the package

 

upside down.

 

 

 

Remove the two grey foam protectors off either side of the unit, leaving the black material covering.

Pull back the material and remove the protective membrane from the front panel.

 

The preamplifier is now unpacked and ready for further installation.

Note:

 

Please retain all packaging material for future transport.

Box

 

 

1 x SM6 MkII Preamplifier

1 x Screwdriver

Contents

1 x SM6 MkII Product manual

2 x Remote trigger leads

 

1 x Perreaux remote control

1 x Detachable AC power cord

 

2 x AAA batteries

3 x Performance analysis charts

Placing

The SM6 should generally be placed close to your amplifier, keeping the

Your SM6

interconnect cabling short. Position all the separate components of your system

 

close enough to your SM6 to avoid having to stretch or extend any of the

 

interconnect cables.

 

 

As a “rule of thumb”, allow 80-100mm(3-4inches) around all sides of the

 

product and mount the SM6 on a flat surface, ensuring that the unit has adequate

 

access to free flowing air.

 

 

Do not place auxiliary equipment directly on top of the SM6.

 

Do not place the SM6 directly atop apower amplifier.

 

Please do not cover the product with a cloth or similar.

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2

 

Instant Install

 

 

If you are like us, the first thing you will want to do is to play your favourite

 

 

 

 

piece of music through your new SM6. The following instructions are written to

 

 

enable you to achieve this as quickly as possible. These are not comprehensive

 

 

instructions, but are designed to enable you to play music now!

Note:

 

 

Please take the time to read the SM6 manual thoroughly as it

 

 

incorporates many features, which will enhance its operation.

 

 

 

 

 

Placement

 

 

The SM6 is a reference preamplifier and best results will be achieved when

 

 

placed on a solid surface with adequate ventilation. DO NOT place on a

 

 

carpeted floor or cover the preamplifier!

 

 

Turn off associated components

 

 

This minimises the potential to damage any other components when connecting

 

 

your SM6 into the system.

 

 

Connect SM6 to power amplifier

 

 

Connect the balanced (XLR) or unbalanced (RCA) outputs of your SM6 to the

 

 

appropriate inputs at the rear of your power amplifier.

Note:

 

 

Try to keep all interconnect cables as far from loudspeaker cables as

 

 

possible and well away from all AC mains leads.

 

 

 

 

 

Connect source component to SM6

 

 

Connect the relevant output of your source component to either the balanced

 

 

(XLR) or unbalanced (RCA) inputs of your SM6.

Note:

 

 

 

Be sure to set the Balanced Input switch to the appropriate position, ON

 

 

if using the balanced (XLR) inputs and OFF if using the unbalanced (RCA)

 

 

inputs.

 

 

 

 

 

Switch on source component

 

 

Turn on the source component and make sure you have some program material

 

 

ready to play.

 

 

Switch on SM6

 

 

After checking the supply voltage compatibility with the voltage rating on the

 

 

SM6 rear panel, insert the power cord-setsupplied into the rear of the unit and

 

 

into the wall. Switch on the socket at the wall and power up the SM6 using the

 

 

switch on the rear panel.

 

 

Switch on power amplifier

 

 

Turn on your power amplifier.

 

 

 

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Test for undesirable noises

Without any program source material, slowly increase the SM6 volume listening for any undesirable noises. After establishing that there are no problems, return the SM6 volume level back to zero.

Play your source material

Start your source material playing.

Increase the volume

Slowly increase the volume on the SM6 to achieve a comfortable listening level.

CONGRATULATIONS!

Now that you have achieved your first objective, sit back, relax and please read the rest of the manual at your own pace, in your favourite armchair, whilst sipping a glass of wine. You’ll find the whole experience much more pleasurable whilst listening to music.

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3

Front Panel Functions

Volume Control and Standby

Volume Control

When either button is depressed, they will alter the volume setting. The volume adjustment range is 00 – 59 (-95dBto +18dB), with 47 indicating 0dB.

Standby

Pressing simultaneously will put the SM6 into standby, disconnecting all power supplies except the digital power supply for the microcontroller and turning off the remote trigger outputs. The selected input and balance settings are saved.

Standby is indicated by a single dot on the display and operation can be resumed by pressing buttons simultaneously again.

Refer to Chapter 5 “Remote Control Functions”, for further details on volume and standby controls.

Alphanumeric Display

The display will illuminate when the power is turned on at the mains power switch or when various remote or front panel adjustments are made. At turn-on,the display will illuminate with 00 and default to the input selected at the last standby cycle.

Source Select and Mute

Source Select

When either button is depressed, they scroll through the source inputs.

The order of source inputs and display indication is as follows:

Source Input

Display

Input A

IA

Input B

IB

Input C

IC

Input D (HT Loop)

HT

Input E

IE

Input F

IF

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Caution! Input D (HT Loop) fixes the output to 0dB, as it is a home theatre bypass. Please ensure the level is suitably attenuated by the upstream processor or receiver before selecting this input.

Note: The source selector has six positions and supplies the chosen source to the Pre/Balanced outputs and Tape outputs. If source input E or F is selected, no signal is supplied to its applicable Tape output to avoid the potentially damaging feed back loop which can occur if inadvertently attempting to record and playback the same source simultaneously.

Mute

Pressing the buttons simultaneously will mute the volume, indicated by “MU” on the display. Mute can be cancelled by pressing the buttons simultaneously again, or increasing the volume setting. The volume setting can be decreased whilst the volume remains muted.

Note: The mute function still operates when source input D (home theatre bypass) is selected.

Refer to Chapter 5 “Remote Control Functions”, for further details on source select and mute controls.

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4

Rear Panel Functions

Caution! Observe precautions regarding volume control settings. Please make all changes at minimum volume setting. Only increase the volume after the connections have been made.

Balanced Inputs

Accepts a signal from a source component with balanced outputs via high quality XLR connectors. The use of good quality balanced line cable into the balanced input cause the input signal to be relatively immune to noise and external effects caused by the use of long interconnect cables, helps reduce hum loop noise and aids in the cancellation of distortion products.

The pin assignments of the balanced XLR input connectors are as follows:

Pin 1: Signal ground

Pin 2: Signal + (non-inverting)

Pin 3: Signal – (inverting)

Shield ground:Chassis ground

Note: Please refer to the operating manuals of your balanced output line level source to verify that the pin assignments of the output connectors correspond to the SM6 balanced inputs. In the event that they are not compatible, the interconnecting cable will need to be altered to suit.

Balanced Input Switch

This switch selects which input to use for source input A. Set to ON if using the balanced (XLR) inputs and OFF if using the unbalanced (RCA) inputs.

Note: Do not connect source equipment to both the balanced and unbalanced inputs at any one time.

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Note: The position of the Balanced Input switch has no bearing on the balanced output, it only selects which input to use for input A. Set the Balanced Input switch to ON only when using the balanced input.

Refer to Chapter 13 “Specifications”, for detail on input sensitivity and impedance.

Unbalanced Source Inputs

Accepts a standard single-endedinput (RCA) from source components withsingle-endedanalogue outputs. These high quality gold plated sockets are highly conductive, corrosion resistant, and provide less potential for corrosion induced distortion.

Caution! Input D fixes the output to 0dB, as it is a home theatre bypass. Please ensure the level is suitably attenuated by the upstream processor or receiver before selecting this input.

Refer to Chapter 13 “Specifications”, for detail on input sensitivity and impedance.

Tape 1 Line Outputs

This single-ended(RCA) output will provide a line level audio signal, suitable for recording, from the selected source input. This output is disconnected when source input E is selected; to prevent any potentially damaging feedback loops.

Tape 2 Line Outputs

This single-ended(RCA) output will provide a line level audio signal, suitable for recording, from the selected source input. This output is disconnected when source input F is selected; to prevent any potentially damaging feedback loops.

Preamp Output 1

This single-ended(RCA) output is commonly referred to as “Preamp Out”. It will provide the audio signal required to drive virtually any amplifier to full power.

Preamp Output 2

This single-ended(RCA) output is wired in parallel with Main Output 1 and is useful for supplying signal to another amplifier ifbi-amping.

Balanced Outputs

This balanced (XLR) preamplifier output provides the signal required to drive virtually any power amplifier equipped with a balanced input. Connection should be made with high quality cables fitted with XLR connectors.

Note: The position of the Balanced Input switch has no bearing on the balanced output; it only selects which input to use for source input A.

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The pin assignments of the balanced XLR output connectors are as follows:

Pin 1: Signal ground

Pin 2: Signal + (non-inverting)

Pin 3: Signal – (inverting)

Shield ground:Chassis ground

Caution! Please refer to the operating manual of your amplifier to verify that the pin assignments of the input connectors correspond to the SM6 balanced outputs. In the event that they are not compatible, the interconnecting cable will need to be altered to suit.

Input Voltage and FuseRating

Input Voltage

It is important that the SM6 be operated from the correct AC mains voltage. This unit is factory set for the voltage applicable to the original country of destination.

The SM6 will operate satisfactorily within a voltage variation of up to ±5% of that voltage at which the unit has been set.

If you require the voltage setting to be altered, e.g. relocation to another area, city or country, or extraordinarily high or low voltages, please contact your Perreaux dealer. Qualified service personnel can only perform this modification.

Caution! Never attempt to connect the unit to the incorrect voltage. Severe damage can result from applying incorrect voltage to the unit.

Fuse Rating

The fuse rating displayed here, refers to the rating of the mains inlet fuse.

For more information on fuse ratings, please refer to Chapter 13 “Specifications”.

Caution! Never replace the fuse with any other ratings other than the one specified.

Serial Number

The serial number is unique to your SM6. Please record this number and store it in a safe place. For any service related enquiry, please be prepared to quote the product serial number to Perreaux personnel or their service representative.

Remote Trigger Outputs

Two parallel remote trigger outputs are provided to switch on or off any connected peripherals to the SM6. In the event that it is not possible to cascade connect peripherals, two outputs are provided. The remote trigger outputs are designed to accept a mono, 3.5mm diameter, male jack. The voltage rating is +5V DC when ON and 0V DC when OFF with maximum current being 10mA.

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The plug must follow the specifications as per the diagram below:

AC Mains Input

An IEC-standardmains input is provided at the rear of the unit. The AC cord set is removable, allowing you to upgrade to a cord set of your preference.

Caution! Prior to connection to the AC mains, please check the voltage label on the rear panel to ensure that your unit conforms to the power supply in your area. Never attempt to connect the unit to the incorrect voltage. Severe damage can result from applying incorrect voltage to the unit.

AC Mains Fuse

The SM6 is equipped with a user serviceable AC mains fuse. In the event of fuse failure, always replace with the same type and value fuse. Remember, fuses do not usually blow without a reason. Any doubts about fuse failure should be conveyed directly to your Perreaux dealer.

For more information on fuse ratings, please refer to Chapter 13 “Specifications”.

Caution! This is the ONLY user accessible fuse.

Never replace the fuses with any other ratings other than the one specified on the rear panel.

Always ensure your SM6 is disconnected from the mains supply before attempting to change the mains fuse.

Power Switch

Depress this switch to the right (I) to turn power ON. Mute relay circuitry is employed in the SM6 and output is muted for 1 to 2 second after the power switch is actuated. Depress this switch to the left (O) to turn the SM6 off at which time the outputs will be disconnected.

Note: The SM6 resets the volume to minimum at turn-on.

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5 Remote Control Functions

Note:

Note:

The SM6 comes supplied with a 36 button Perreaux Universal infrared remote control.

The remote control uses 2 x AAA batteries and may be changed by removing the black perspex insert.

Press the button on the remote to select thecode-setrequired to control the SM6.

The SM6 uses the following functions:

Standby

Pressing this button puts the SM6 into standby, disconnecting all power supplies except the digital power supply for the microcontroller and turning off the remote trigger outputs. Standby is indicated by a single dot on the display and operation can be resumed by pressing standby again or selecting a source input.

Mute

Depressing this control causes volume to be muted. The display will indicate "MU" and the volume will remain muted until the volume level is increased, or the mute button is depressed again at which stage volume will be returned to the previous setting.

The mute control has a ‘punch through’ function and will operate regardless of the code-setselected i.e. you can be operating the CD player remote functions and still use the mute controlwithout selecting thebutton first.

Display

Pressing this button will cause the display to turn off, and is intended for use if the light of the display is distracting (for instance in a darkened room). Any operations performed will be momentarily displayed before resuming a turned off state. The display can be turned on by again pressing the display button.

Balance Left /BalanceRight

The balance controls allow you to vary the level of either the Left or Right channel to obtain the correct stereo balance for your listening position. Pushing the Balance Left button will cause the level of the right channel to be attenuated (decreased in volume). Pushing the Balance Right button will cause the level of the left channel to be attenuated.

During any balance adjustment the display will indicate the direction of adjustment, left or right, with an "L" or an "R" followed by a number indicating the level of adjustment. The range is L1-L9andR1-R9."LR" on the display indicates the balance is centred.

15

Note:

Note:

Note:

Balance settings are stored when the unit is put into standby.

/Input A Source Select

Depressingselects source input A and the relevantcode-setto control the compact disc player. Pressingselects source input A only. Source input A is indicated by “IA” on the display of the SM6.

/Input B Source Select

Depressingselects source input B and the relevantcode-setto control the tuner. Pressingselects source input B only. Source input B is indicated by “IB” on the display of the SM6.

Input C Source Select

Depressing this control selects source input C. Source input C is indicated by “IC” on the display of the SM6.

Input D Source Select (home theatre bypass)

Depressing this control selects source input D. This offers a preamplifier bypass for home theatre applications. Home theatre bypass mode is indicated by “HT” on the display of the SM6.

Volume and balance functions are disabled in home theatre bypass mode, although the volume can still be muted.

Input E Source Select

Depressing this control selects source input E. Source input E is indicated by “IE” on the display of the SM6.

Input F Source Select

Depressing this control selects source input F. Source input F is indicated by “IF” on the display of the SM6.

Volume Up

Depressing this button increases the volume.

Volume Down

Depressing this button decreases the volume.

The Volume control has a ‘punch through’ function and will operate regardless of the code-setselected i.e. You can be operating the CD player remote functions and still use the volume controlswithout selecting thebutton first.

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Scroll Source Up

Pressing this button scrolls the source input up, selecting in the order: IA IB IC HT IE IF

Scroll Source Down

Pressing this button scrolls the source input down, selecting in the order: IA IF IE HT IC IB

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6 Special Design Philosophies

Perreaux has been designing and manufacturing only the highest quality audio componentry for more than a quarter of a century. Technology has continued to evolve rapidly over that time and our knowledge and application of design, materials and manufacturing techniques has advanced in tandem with this. Today’s Perreaux range comes closer to fulfilling our shared vision than at any other time in the past.

To follow is a discussion on some of Perreaux design philosophies that have been incorporated into the entire range.

Minimalist Leading British architect, John Pawson, writes:

Design

“The Minimum can be defined as the perfection that an object achieves when it is no longer possible to improve it by subtraction. This is the quality that an object has when every component, every detail, and every junction has been reduced or condensed to the essentials. It is the result of the omission of the inessentials”.

Perreaux has historically embraced the minimalist ethic from an audio design perspective only. The concept of “less equating to more” has been at the heart of all Perreaux audio designs for more than a quarter of a century.

Minimalist Electronics

We wish to maximise the quality of your listening pleasure by keeping the componentry and signal path as uncluttered, short and clean possible. All components in the signal path, even those of the highest quality have an effect on the signal, thereby altering the quality of the reproduction in some way. Our aim is to recreate in its entirety, the original performance by not adding or subtracting anything, irrespective of the source.

Minimalist User Interface

We carefully study the user interface and par down the number of buttons and associated clutter leaving just the essential and no more. How tempting it has been over the years to loose sight of our core values as technology or trends have made it possible. That is one of the reasons why our older products still have such a high resale value today. The user interface has and always will remain simple, free from adornments, clean and uncluttered.

Minimalist Aesthetics

Our products appeal to those who seek the ultimate in audio exclusivity, namely the perfect blend of “form and function”.

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“Form and function” are both tough masters. That is why our amplifier heat sinks are not hidden, but instead feature prominently in all our designs. We make no excuses for producing some of the most distinctive high-endaudio products on the planet. We let “form and function” blend together in perfect harmony. This surely is the essence of true minimalist utilisation.

Minimalism in a Wider Context

John Pawson writes:

“Clearly simplicity has dimensions to it that go beyond the purely aesthetic: it can be seen as the reflection of some innate, inner quality, or the pursuit of philosophical or literary insight into the nature of harmony, reason, and truth”.

19

7

 

Special Design Features

Rugged Build

 

Mechanical strength has been a hallmark of Perreaux products since the

 

Quality

 

company first started production back in 1974. The concept behind the physical

 

 

design and construction is that each structural member should contribute to both

 

 

rigidity and performance.

Balanced

 

The SM6 is a truly

balanced preamplifier, from input to output. The positive

Design

 

and negative halves of the signal never touch, remaining balanced throughout all

 

 

stages. This circuit topology offers the ultimate in performance, providing

 

 

increased noise rejection and lower levels of distortion.

Class A

 

Four discrete output stages operating in Class A provide output buffering. This

Output

 

enables low impedance loads to be driven, over long cable lengths using any

 

 

cable.

 

Multiple

 

There is a separate power supply for each section of the preamplifier. One for

Power

 

each of the volume control chips (two chips are used to keep the system fully

Supplies

 

balanced and therefore, to maintain separation, each chip is supplied with it’s

 

 

own separate power supply), another one for each of the output buffering stages

 

 

(once again because the SM6 utilises a fully balanced circuit topology), another

 

 

for the digital logic and the final power supply looks after the input relays. The

 

 

advantage of this is that there is complete isolation from stage to stage. The

 

 

digital noise is kept completely out. This is further evidence of a thoroughly

 

 

designed product offering.

Infrared (IR)

 

Many audiophile grade components are still provided with analogue controls

Remote

 

that are adjusted on the faceplate of the unit. The SM6 features an infrared (IR)

Control

 

remote control meaning you don’t have to get out of your chair to make an

 

 

adjustment. Some of the functions available are: standby, mute, volume

 

 

up/down, display on/off, input select and balance.

Earthing

 

Perreaux engineers pay particular attention to designing the product to ensure

 

 

maximum separation between internal signal and power earths, only meeting at a

 

 

central starred point.

 

Precision

 

The SM6 uses two digitally controlled resistor ladder volume controls. This is

Volume

 

because we treat the positive and negative parts of the signal separately (true

Control

 

balanced topology).

The advantages of using a digitally controlled analogue

 

 

resistor ladder to adjust volume are precise control, no contacts to corrode

 

 

creating wiper noise and no analogue component drift.

Dual Outputs

 

You do not need to purchase an RCA style splitter if you want to drive two

 

 

separate power amps simultaneously, as there are dual parallel preamplifier

 

 

outputs.

 

 

 

 

 

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