Perreaux Stereo Amplifier SX25i User Manual

SX25i  
25W Integrated Amplifier  
Owners Manual  
 
This page has intentionally been left blank.  
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i
Introducing the  
Perreaux Silhouette Series  
Designed as a range of high quality, yet affordable modules; the  
‘Silhouette’ series will compliment and enhance your existing  
system.  
Drawing on our extensive knowledge gained from more than a  
quarter of a century of developing highest quality audio products,  
the ‘Silhouette’ concentrates our legendary design and build  
quality into a compact package without sacrificing performance.  
The Perreaux ‘Silhouette’ series provides performance levels  
never before seen in its class.  
Key Features Class A signal stages  
Highest quality internal power supply featuring a custom  
designed, fully shielded toroidal transformer and 13200µF  
of smoothing capacitance  
Optimal internal layout incorporating total separation  
between channels  
Enhanced audio design featuring highest quality PCB and  
minimal internal wiring  
Line-out connections  
High current drive  
Compact  
Stylish  
T he P erreaux “S ilhouette” series takes you even closer to the  
elusive goal of “T he P erfect R e-C reation of a M usical  
E vent”.  
From all of us at Perreaux Industries Limited, thank you for  
choosing the Perreaux Silhouette Series SX25i Integrated  
Amplifier.  
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ii  
Important Safety Instructions  
Note:  
Please read all instructions carefully before attempting to  
operate your Perreaux “Silhouette” SX25i Integrated  
Amplifier.  
ALWAYS switch off power to your system before attempting to  
connect or disconnect cables.  
ALWAYS disconnect your system from the mains before  
attempting to clean your unit.  
ALWAYS keep electrical equipment out of reach of children.  
ALWAYS unplug sensitive electronic equipment during  
electrical storms.  
NEVER disconnect the mains earth from the system.  
NEVER operate the SX25i with the cover removed.  
NEVER use any liquid inside the SX25i.  
NEVER bypass any fuse.  
NEVER attempt to repair the SX25i. In the event of a problem,  
please contact your Perreaux dealer.  
NEVER expose the SX25i to extremely high or low  
temperatures.  
NEVER operate this product in an explosive atmosphere.  
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iii  
Table of Contents  
i
Introducing the Perreaux Silhouette Series .................................... 3  
Important Safety Instructions............................................................. 4  
Table of Contents .................................................................................. 5  
Unpacking and Placement .................................................................. 6  
Instant Install .......................................................................................... 7  
Front Panel Functions .......................................................................... 9  
Rear Panel Functions ..........................................................................10  
Special Design Philosophies..............................................................12  
Special Design Features .....................................................................14  
Care and Maintenance .......................................................................16  
Warranty Information ........................................................................17  
Extended Warranty Registration Form..........................................18  
Troubleshooting Guide......................................................................19  
Specifications........................................................................................21  
Physical Dimensions............................................................................24  
Contact Details.....................................................................................25  
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iii  
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5
6
7
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9
10  
11  
12  
13  
5
 
1
Unpacking and Placement  
Unpacking The SX25i is packaged for maximum protection. To open, sit the  
Procedure box upright and cut the reinforced tape at the top of the box. The  
product can now be removed.  
Pull the foam protecting end-caps off either side of the unit and  
remove the black material covering.  
The SX25i Integrated amplifier is now unpacked and ready for  
further installation.  
Note:  
Please retain all packaging material for future transport.  
Box 1 x SX25i Integrated amplifier  
Contents 1 x Product manual  
3 x Performance analysis charts  
1 x Detachable AC power cord  
Placing Your The SX25i should generally be placed close to your source  
SX25i equipment, thus keeping interconnect cabling between the SX25i  
and associated components as short as practical. This will reduce  
the systems susceptibility to radio frequency interference and the  
negative effects associated with long cables.  
Ventilation The SX25i is a convection cooled amplifier. For optimal  
Requirements performance, the unit MUST receive adequate ventilation.  
Please do not cover the product with a cloth or similar.  
Please do not mount the SX25i directly onto carpeted  
surfaces.  
In the event that the SX25i is to be incorporated into custom  
cabinetry, please refer to the dimensional information provided in  
the Physical Dimensions section of the manual (Chapter 12).  
Note:  
Please take all necessary steps to ensure that the unit  
receives adequate ventilation  
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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 SX25i. 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 SX25i manual thoroughly  
as it incorporates many features, which will enhance its  
operation.  
Placement  
The SX25i is a convection cooled 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!  
Place the SX25i close or near the source component in order to  
make as short a connection as possible.  
Turn off associated components  
This minimises the potential to damage any other components  
when connecting your SX25i into the system.  
Connect source to SX25i  
Connect the audio output from the source component to the  
inputs at the rear of the SX25i. Refer to Chapter 4 for Rear Panel  
information.  
Connect loud speaker cables to SX25i  
Connect your left and right channel loudspeaker leads to the  
bindng posts at the rear of the amplifier. Refer to Chapter 4 for  
Rear Panel information.  
Note:  
Make sure the nominal impedance of the loudspeakers is  
not lower than 2.  
7
 
Switch on SX25i  
Caution!  
Prior to connecting 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.  
Insert the power cord supplied into the rear of the SX25i and into  
the wall. Switch on the socket at the wall and turn on the power  
of the SX25i by setting the power switch down.  
Switch on source component  
Power up your source component and start your favourite  
recording. Slowly increase the SX25i volume 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 hot cup of coffee. You’ll find  
the whole experience much more pleasurable whilst listening to  
music.  
8
 
3
Front Panel Functions  
Power LED  
This blue LED indicates the power status of your SX25i  
integrated amplifier.  
Volume Control  
The high-quality, machined aluminium knob is the sole user  
interface, reminding the user at every touch of the superior build  
quality designed into the SX25i. Volume control motion is  
smooth and accurate, providing absolute control with near  
infinite gain resolution.  
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4
Rear Panel Functions  
Right and Left Speaker Binding Posts  
Binding posts are clearly marked and colour coded RED Positive  
(+) and BLACK Negative (-). This polarity must be observed  
when connecting loudspeakers, i.e. positive terminal of the  
SX25i to the positive terminal of the loudspeaker and negative  
terminal of the SX25i to the negative terminal of the  
loudspeaker.  
Caution!  
Never connect the amplifier’s output terminals to any  
device other than a loudspeaker.  
Please do not short circuit the amplifier’s output terminals.  
Never connect the output of one amplifier to the output  
terminals of another amplifier.  
Do not over-tighten the binding posts on your amplifier.  
Right and Left Line Inputs  
Input from source component, accepts a standard unbalanced  
input (RCA). The left channel connection is on the right when  
looking from the rear, indicated by white inner ring. For more  
information on input specifications, please refer to Chapter 11.  
10  
 
Serial Number/Voltage Label  
The serial number is unique to your SX25i. 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.  
The voltage displayed in this area is the ONLY voltage that can  
be accepted by the unit.  
Caution!  
Never attempt to connect the unit to the incorrect voltage.  
On/Off Switch  
When operating the switch down, power is applied to the SX25i.  
AC Mains Input  
An IEC-standard mains input is provided at the rear of the unit.  
The AC cord set is removable, allowing it to be upgraded at your  
will.  
Right and Left Line Outputs  
Line level output, accepts a standard unbalanced input (RCA).  
The left channel connection is on the right when looking from  
the rear, indicated by white inner ring. For more information on  
input specifications, please refer to Chapter 11.  
11  
 
5
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.  
The SX25i has been developed to meet customer demands for  
compact higher quality products. Careful attention has been  
taken throughout the development phase, not to make  
compromises that would degrade the high quality of reproduction  
that the unit is capable of delivering.  
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. Our current product offering  
takes the minimalist ethic to new levels by totally embracing the  
concept.  
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.  
12  
 
Minimalist Aesthetics  
Our products appeal to those who seek the ultimate in audio  
exclusivity, namely the perfect blend of “form and function”.  
“Form and function” are both tough masters. We make no  
excuses for producing some of the most distinctive high-end  
audio 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”.  
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6
Special Design Features  
Construction The SX25i is stylish and unobtrusive. The front panel is made  
from high quality solid 6.0mm (0.2”) thick aluminium extrusion  
featuring our trademark machined Perreaux logo and large  
volume control knob. These are finished in durable and stylish  
satin chrome finish electroplate. On/off status is provided via a  
discreet blue LED inset into the front panel. The chassis and  
cover are both manufactured from heavy gauge steel. No cover  
fixing screws are visible. These minimalist styling cues combine  
seamlessly to allow form and function to blend in harmony and  
are typical hallmarks of the Perreaux brand.  
Circuit  
Topology  
Compact At 216mm (8.5”) wide x 58mm (2.3”) high x 190mm (7.5”) deep  
the SX25i is extremely compact.  
Integrated By eliminating the interface between separate pre and power  
amplifiers and removing concerns about impedance matching,  
the SX25i provides a shorter, purer signal path without costly  
exposed interconnect cables and separate power cords.  
Unsurpassed  
Performance  
Capable of continuously delivering 25w per channel into an 8Ω  
load and 35W into 4, the SX25i is powerful. When correctly  
matched to loudspeakers, the SX25i will deliver unsurpassed  
performance in its class and will effortlessly drive a vast array of  
smaller loudspeakers with the control and authority that people  
have come to expect from Perreaux products.  
14  
 
Finest The SX25i features a 98VA toroidally wound mains transformer  
Quality directly soldered to the PCB, Wima / Elna brand capacitors,  
Components highest quality Zobel network, customized internal heat sink  
Used  
solution and mains and channel fusing. The PCB is double-sided  
Throughout and constructed from the highest quality fibreglass base stock  
featuring 2oz tracks.  
The Power Perreaux has specially developed a fully shielded 98VA internal  
Supply toroidal based power supply. No fewer than six filter capacitors  
are coupled in parallel providing a total of 13,200uF of power  
supply smoothing, keeping ripple to a minimum. As a result the  
power supply is extremely rigid, capable of delivering  
instantaneous power requirements demanded by musical  
transients.  
The result is significantly improved dynamic  
capabilities.  
Simple Front panel features on/off LED indication and volume control  
control knob. The rear panel comprises a mains input receptacle,  
functionality allowing the cord set to be upgraded if desired, mains switch,  
high quality speaker binding posts, RCA line input and line  
output.  
Single  
Channel  
Block  
Diagram  
Ultra Short Careful attention has been paid to the signal path within the  
Signal path amplifier. It is ultra short, guarded by ground planes where  
necessary and carefully routed to avoid contamination from  
power supply and high current bearing sections.  
Input Stage Utilising a stable current source, along with accurate current  
mirroring circuitry, the input stage of the SX25i, in combination  
with the overall circuit topology, provides precise detail  
resolution and definitive sonic transparency.  
PCB Layout Special attention has been lavished on the PCB layout. The unit  
is symmetrical in design with each channel being isolated from  
the other. The super clean custom designed power supply is  
physically segregated from the rest of the sensitive electronics.  
Signal Special attention has been paid to ground planes to maintain  
Ground sonic purity. All signal grounding is optimised to provide a  
platform for a black background and increased dynamic range.  
15  
 
7
Care and Maintenance  
Note:  
Please switch the unit off and remove the cord set from the  
rear of the Amplifier before attempting to clean your SX25i  
in the manner described below.  
Never apply liquid directly to the SX25i.  
Never use abrasives.  
Never rub in a circular motion.  
Cover  
The cover features a durable high quality powder coat finish. To  
remove finger marks and dirt, lightly rub the surface with a soft  
cloth.  
If the dirt is not removed, dip your cloth in a mild solution of  
soap and water, squeeze excess moisture from it and then gently  
reapply to the surface.  
Stubborn dirt may be removed by the application of a small  
quantity of isopropyl alcohol, applied directly to the cleaning  
cloth only, and reworking the effected area.  
Front Panel The SX25i front panel features a high quality electroplate finish.  
Over time the surface may retain finger marks and may need to  
be cleaned to restore it to original condition.  
Regular Cleaning  
Gently wipe the front panel with a very clean cotton cloth. Wipe  
across the surface and never in a circular motion.  
Removing Stubborn Marks  
Only attempt this infrequently, as too regular or vigorous  
application may damage the surface.  
Apply a small quantity of any car polish containing carnauba  
wax to a very clean cotton cloth.  
Note:  
The car polish must state “Safe for Clear Coats” as the polish  
will therefore contain the absolute minimum amount of  
abrasive compound.  
Gently wipe over the front panel in lateral motion, allow to dry  
then gently wipe off with a very clean cotton cloth.  
16  
 
8
Warranty Information  
1 Year The Perreaux SX25i is warranted free from defects in material  
Limited and workmanship under normal use for a period of 1-year (365  
Warranty days) from the date of purchase.  
To extend the warranty of the Perreaux SX25i to three (3) years  
from date of purchase, please return a fully completed warranty  
registration form along with a copy of the original receipt of  
purchase to:  
Perreaux Industries Ltd  
PO Box 47413  
Ponsonby  
Auckland  
New Zealand  
For the Extended Warranty Registration Form, please refer to  
Chapter 9.  
3 Year The extended warranty for the Perreaux SX25i is three (3) years  
Extended from the date of purchase. If during the warranty period the  
Warranty SX25i exhibits defects in materials and/or workmanship, it will  
be repaired or replaced, at our option, without charge for either  
parts or labour, at our factory in Auckland, New Zealand. The  
warranty does not apply to any unit that has been misused,  
abused or altered.  
Any unit that is not performing satisfactorily may be returned to  
the factory in Auckland, New Zealand for evaluation. Return  
authorisation must first be obtained by either calling or writing to  
Perreaux prior to shipping the unit. Perreaux Industries Ltd and  
it’s authorised distributors and dealers shall not be held liable for  
any freight or insurance charges. Freight and insurance charges  
to and from the Perreaux factory will be the sole responsibility of  
the owner of the unit.  
There is no other express warranty on the SX25i. Neither this  
warranty nor any other warranty, express or implied, including  
any implied warranties of merchantability of fitness, shall extend  
beyond the warranty period. No responsibility is assumed for  
any incidental or consequential damages.  
Obtaining In the event that you are experiencing difficulty with your SX25i,  
Service please as a first step consult the troubleshooting guide in Chapter  
10. For further assistance, please contact your Perreaux dealer.  
17  
 
9
Extended Warranty  
Registration Form  
Please complete this form and either fax, mail or e-mail it, along  
with a copy of the original receipt, to Perreaux Industries Ltd.  
Fax:  
+64 9 815 5981  
Mail:  
Perreaux Industries Ltd  
PO Box 47 413  
Ponsonby  
Auckland  
New Zealand  
Alternatively, complete the online Warranty Registration Form  
3 Year Extended  
Warranty Form  
Name:  
Address:  
Suburb:  
City:  
Country:  
Telephone:  
E-mail:  
Website:  
Product:  
S I L H O U E T T E S X 2 5 i  
Serial No:  
Dealer:  
Purchase Date:  
/
/
d
d
m m  
y
y
y
y
18  
 
10  
Troubleshooting Guide  
Please use this guide if you are experiencing any problems with  
the SX25i in your system. It will provide possible solutions for  
some given symptoms.  
There is no SX25i not turned on  
output from  
my system  
Make sure the SX25i power switch is in the DOWN position.  
AC cord not plugged in  
Check that the AC cord is plugged into the IEC socket on the rear  
of the SX25i.  
Mains power not turned on  
Check if the power is turn on at the mains socket on the wall.  
Interconnect cables not connected  
Make sure that the input and output interconnect cables are  
plugged in and are connected to the respective RCA sockets on  
the rear of the SX25i.  
Source not turned on  
Check that your source component is plugged in to the mains and  
the power is turned on.  
Source not set to play  
Ensure that your source component is playing the recording you  
would like to listen to, and that pause is not pressed.  
No volume setting  
Make sure that the volume on your SX25i is set to a suitable  
level.  
SX25i set to incorrect input  
Confirm that the input on your SX25i is connected to the  
appropriate source output.  
Loud speakers not connected  
Check that your loud speakers are firmly connected via cables  
into the binding posts on the rear of the SX25i.  
19  
 
I can hear a Input sockets and/or output binding posts corroded  
hum coming  
through my  
Check that the input and output RCA sockets and binding posts  
on the rear of the SX25i are free from corrosion.  
loud  
speakers  
Interconnect cables damaged  
Make sure that the integrity of your interconnect cables is sound  
and they are firmly connected to your source and the SX25i.  
SX25i is close to external interference  
Check the proximity of your SX25i to any possible source of  
EMI and/or RF interference, for example computers, televisions,  
amplifiers, speakers, etc. Ideally the SX25i should be placed as  
close as possible to your source.  
20  
 
11  
Specifications  
The correlation between published specifications and sonic  
quality can be unreliable. A list of numbers reveals virtually  
nothing.  
All technical measurements must be subject to  
qualitative as well as quantitative interpretation. Measurements  
of the SX25i reveal excellent results by any standards. Tested at  
115V and 230V after a 10 minute warm up period.  
Specifications  
in Brief  
Rated Power Output (per channel)...........................25WRMS into 8Ω  
...........................................................................35WRMS into 4Ω  
Voltage Swing...................................................................55.2Vp-p  
Input Sensitivity..............................................................0.63VRMS  
Maximum Gain .................................................................. 27.1dB  
Input Impedance:  
Typically.............................................................................40kΩ  
Total Harmonic Distortion (THD+N):  
Typically............................................. 0.002%, @ 1kHz into 8Ω  
20Hz to 20kHz................................................................ <0.02%  
Frequency Response:  
20Hz–20kHz........................................................ +0dB, -0.25dB  
5Hz–60kHz............................................................ +0dB, -1.0dB  
Signal to Noise Ratio:  
Rated Output (unweighted)................................................... 100dB  
Dynamic Headroom (rated with music)................................... >2.0dB  
Power Consumption:  
Idle....................................................................................... 10W  
Maximum (at 35W per channel into 4)...................................... 80W  
Audio Connections  
Inputs.......................................................... 1 pair line level (RCA)  
Outputs....................................................... 1 pair line level (RCA)  
.......................................................2 pairs speaker binding posts  
Other Connections  
IEC AC mains input receptacle  
Mains Input Voltage  
115V or 230V AC at 50Hz/60Hz  
(Set within the SX25i at time of manufacture)  
21  
 
Internal Mains Fuse Rating  
1 x 2SB 500mA slow blow  
(NOT user serviceable)  
Internal Output Fuse Rating  
2 x 2SB 4A normal blow  
(NOT user serviceable)  
Overall Dimensions  
Width........................................................................216mm (8.5”)  
Depth........................................................................192mm (7.6”)  
Height.........................................................................58mm (2.3”)  
Weight  
Gross ..........................................................................3.0kg (6.6lb)  
Net............................................................................. 2.4kg (5.3lb)  
Specifications  
Explained  
Rated Power Output (per channel).......................25WRMS into 8Ω  
This is the optimum operating level of the unit, offering the best  
performance whilst allowing  
a
large enough buffer to  
accommodate the unpredictable nature of music. It is the  
reference output level to which other specifications, such as  
sensitivity and gain, are referred. The Rated Output does not  
indicate the full capability of the SX25i.  
Voltage Swing ...................................................................... 55.2Vp-p  
Loud transients call for a sudden burst of power from the  
amplifier to drive the speakers. This force is voltage. Peak-to-  
peak voltage is a more useful specification than Watts when it  
comes to delivering power to a speaker.  
Input Sensitivity ...................................................................0.63VRMS  
The Input Sensitivity figure indicates the input voltage required  
to achieve “rated” output (25WRMS into 8).  
Maximum Gain....................................................................... 27.1dB  
The amount of amplification the amplifier is asserting on the  
input signal. Gain can be calculated by dividing the rated output  
by the input sensitivity.  
Input Impedance....................................................................... 40kΩ  
The resistance “load” that is presented to the source component  
that is driving the SX25i.  
22  
 
THD+N.....................................................0.002%, @ 1kHZ into 8Ω  
Total Harmonic Distortion + Noise is the percentage of output  
signal which is made up of frequencies added due to harmonics  
of the fundamental frequency and noise. By using low-noise  
input circuitry and Class A signal stages, Perreaux engineers  
have kept this figure to a minimum.  
Frequency Response.................. 20Hz to 20kHz, +0dB -0.25dB  
Describes the frequency range where the amplitude or strength of  
the output signal deviates by no more than 0.25dB.  
Signal to Noise Ratio (unweighted)........................................ 100dB  
The ratio of desired signal to noise signals in the output.  
Integrated reproduction is susceptible to noise because of the  
nature of the environment to reveal every detail. This is why  
Perreaux engineers have designed the SX25i to maintain a low  
noise floor.  
Dynamic Headroom ............................................................. >2.0dB  
This indicates the SX25i can provide more than enough extra  
power to cope with the sharpest musical transients. Without  
adequate headroom, an amplifier can become unstable under  
clipping conditions. Perreaux amplifiers are intrinsically stable  
under all dynamic conditions.  
23  
 
12  
Physical Dimensions  
24  
 
13  
Contact Details  
For more information please contact your Perreaux dealer, or  
contact:  
Perreaux Industries Ltd  
PO Box 47 413  
Ponsonby  
Auckland  
New Zealand  
Ph:  
Fax:  
+64 9 815 5452  
+64 9 815 5981  
25  
 
Installation Notes  
26  
 

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