Perreaux Prisma 750 User manual

Prisma 750
Monoblock Power Amplifier
Owners Manual

2
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 ri ht to chan e products or
specifications detailed herein at any time without notice, and does not make any commitment to
update the information contained herein. No licenses to patents or other intellectual property of
Perreaux are ranted by the Company in connection with the sale of Perreaux products, expressly or
by implication.
mboob^ru
®
is a re istered trademark of Perreaux Industries Ltd.
Terms and product names in this document may be trademarks of others.

3
i
ii
i Introducing the Perreaux
750 Power Amplifier
Con ratulations on your Perreaux 750 purchase. To realise the full potential of
your unit you need to appreciate all aspects of its operation.
Before installin the 750 into your system, read the entire manual carefully.
Endeavour to un
derstand every detail by familiarisin yourself with the controls
and features as you read. You will find it easier to install usin the relevant
sections of this manual as a reference.
We have attempted to explain every feature and operation facet clearl
y 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 si nificance of
your investment in Perreaux.
Perreaux products are desi ned to prov
ide the utmost in sonic realism and
electronic reliability with a functional yet ele ant appearance that reflects the
care and craftsmanship applied durin all sta es of construction.
Features at a
Glance
 Balanced and Unbalanced inputs
 Ru ed build quality
 Ultra-stiff power supply
 Soft-Start circuit
 Hybrid Class A/AB output sta es
 MOSFET output devices
 Hi hly powered
 Dual bindin posts
 Remote tri er input and output
 Multiple protection systems
 Advanced PCB desi n and earthin techniques
 Earth isolation switch
To maintain the consistently hi h quality that you expect from us, and we expect
from ourselves, Perreaux products are essentially handcrafted.
We maintain the human-
link throu hout, from desi n and construction, throu h
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 choosin the
Perreaux Prisma Series 750 monoblock power amplifier.

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ii
iiii
ii Important Safety Instructions
Note:
All safety and operation instructions should be read carefully before the
750 is operated. Keep the Owners Manual in a safe place for future
reference.
 The 750 should
not be used near water, for example near a bathtub, kitchen
sink, in a wet basement, near a swimmin pool, etc.
 Mountin to a wall or ceilin should be via a heavy-duty bracket or shelf
desi ned for audio equipment use.
 The 750 should be situated away from heat sources such as radiators,
stoves, or other appliances that produce excessive amounts of heat.
 Always ensure the 750 heat sinks have adequate ventilation enablin air
circulation both above and below.
 DO NOT place the 750 directly onto carpeted surfaces.
 Avoid exposin the 750 to extremely hi h or low temperatures.
 The 750 should be connected to a mains power supply only of the type
described in the operatin 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 a ainst it.
 The power cord of the 750 should be unplu ed from the mains outlet
when the unit is to be left unused for lon periods or when attemptin to
connect or disconnect cables and before cleanin your unit.
 Care should be taken so that objects and/or liquids do not accidentally fall
inside the 750.
 Please keep electrical equipment out of reach of children.
 Please unplu sensitive electronic equipment durin electrical storms.
 Please replace any fuse with the value and type specified.
 Avoid operatin the 750 with the cover removed.
 DO NOT bypass any fuse.

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 DO NOT attempt to repair the 750. In the event of a problem, please
contact your Perreaux dealer.
 DO NOT operate this product in an explosive atmosphere.
Caution!
he 750 is an extremely high powered, convection cooled amplifier. he
finned outer heat sinks may become very hot when delivering high
volume levels –
to avoid injury; care should be taken not to touch the
heat sinks during operation.
DO NO , UNDER ANY CIRCUMS ANCES, EAR H EI HER OU PU OF
HE 750 – SERIOUS DAMAGE MAY OCCUR IF HIS IS NO ADHERED O.

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iii
iiiiii
iii Table of Contents
i
ii
i Introducing the Perreaux 750 Power Amplifier ........................................................3
ii
iiii
ii Important Safet Instructions ........................................................................................4
iii
iiiiii
iii Table of Contents ..............................................................................................................6
1
11
1 Unpacking and Placement..............................................................................................7
2
22
2 Instant Install......................................................................................................................9
3
33
3 Front Panel Functions................................................................................................... 11
4
44
4 Rear Panel Functions..................................................................................................... 12
5
55
5 Special Design Philosophies ........................................................................................ 16
6
66
6 Special Design Features................................................................................................ 18
7
77
7 Maximising S stem Potential ...................................................................................... 20
8
88
8 The Power MOSFET....................................................................................................... 22
9
99
9 Care and Maintainance................................................................................................ 25
10
1010
10 Warrant Information and Obtaining Service........................................................ 26
11
1111
11 Extended Warrant Registration Form.................................................................... 27
12
1212
12 Faultfinding Your S stem............................................................................................. 28
13
1313
13 Specifications................................................................................................................... 33
14
1414
14 Ph sical Dimensions ...................................................................................................... 36
15
1515
15 Contact Details................................................................................................................ 37

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Unpacking and Placement
The 750 is packa ed for maximum protection. Please carefully read the
instructions below before proceedin to unpack the unit. Be extremely careful.
Unpacking
Procedure
 Inspect both ends of the cardboard box and open at the end without the
central staple by slittin the reinforced tape at either side.
 Fold back the flaps and tip the packa e on end and the inner box will
slide out.
 Lay the inner box down flat and upri ht, open it conventionally by
separatin the top tray from the bottom.
 The product can now be removed from the bottom packa in . This will
be easier if you have someone to help you by holdin the base of the
box.
 Alternately, the bottom tray and amplifier could be tipped upside down
and the bottom packa in removed. If opened in this manner, please
ensure that you turn the contents over a ain.
Note:
Be very careful to secure the unit if you are planning to flip the package
upside down.
 Remove the two white polystyrene protectors off either side of the
amplifier, leavin the black material coverin .
 Pull back the material and remove the protective black tissue from the
front panel.
The amplifier is now unpacked and ready for further installation.
Note:
Please retain all packaging material for future transport.
Box
Contents
1 x 750 Power amplifier
1 x 750 Product manual
1 x Detachable AC power cord
3 x Performance analysis charts
Placing
Your 750
The 750 should enerally be placed close to your preamplifier, keepin the
interconnect cablin short.
We stron l
y recommend keepin the 750 on it’s own separate shelf to allow for
proper ventilation.

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Ventilation
Requirements
The 750 is a hi h-powered amplifier. For optimal performance, the unit M UST
receive adequate ventilation.
 Please do not install in a sealed cabinet.
 Please do not stack products directly on top of the unit.
 Please do not cover the product with a cloth or similar.
 Please do not mount the 750 directly onto carpeted surfaces.
 As a “rule of thumb”, allow 80-100mm (3-4 inches) around all sides of
the product and mount the 750 on a flat surface, ensurin that the unit
has adequate access to free flowin air.
 In the event that the 750 is to be incorporated into custom cabinetry,
please refer to Chapter 14 “Physical Dimensions”.
Note:
Please ta
ke all necessary steps to ensure that the unit receives adequate
ventilation

9
2
22
2 Instant Install
If you are like us, the first thin you will want to do is to play your favourite
piece of music throu h your new 750. The followin instructions are writte
n to
enable you to achieve this as quickly as possible. These are not comprehensive
instructions, but are desi ned to enable you to play music now!
Note:
Please take the time to read the 750 manual thoroughly as it incorporates
many features, which will enhance its operation.
Placement
The 750 is a hi h-
power amplifier 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 amplifier!
Turn off associated components
This
minimises the potential to dama e any other components when connectin
your 750 into the system.
Connect preamplifier to 750
Connect the output of your preamplifier to either the balanced (XLR
) or
unbalanced (RCA) input at the rear of the 750 and set th
e input confi uration
to le switch at the rear to the correct position.
Note:
ry to keep all interconnect cables as far from loudspeaker cables as
possible and well away from all AC mains leads.
Connect speaker cables to the speaker terminals
We recom
mend usin hi h quality connectors for your speaker cables, spade
lu s are the preferable option as they combine a lar er surface area with the
possibility of a stron mechanical connection; however, hi h quality banana
terminals are also acceptable.
Note:
Be careful to maintain phase integrity, positive (+) to positive (+), negative
(-) to negative (-).
Switch on preamplifier
Turn on the preamplifier and set the volume to the minimum level. Select the
respective input to which your source component is connected.
Switch on 750
After checkin the supply volta e compatibility with the volta e ratin on the
750 rear panel, insert the power cord-
set supplied into the rear of the unit and
into the wall. Switch on the socket at the wall and power up the 750
usin the
switch on the rear panel.

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Start our source component
Switch on the source component both at the wall and on its front panel. Ensure
you have some source material inserted and press play.
Increase the volume
Slowly increase the preamplif
ier volume control to achieve a comfortable
listenin 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
sippin a lass of wine
. You’ll find the whole experience much more
pleasurable whilst listenin to music.