ATC SCM150ASLT LIMITED EDITION User guide

SCM150ASLT
LIMITED EDITION
ACOUSTIC
ENGINEERS
®
OWNER’S HANDBOOK

INDEX
A Personal Message from Billy Woodman 2
The ATC Story 4
Introducing the SCM150ASLT Limited Edition 8
SCM150ASLT Limited Edition: Features/Specifications 10
P6 Power Amplifier: Features/Specifications 12
User Guide 14
0/1
WORLD-CLASS
LOUDSPEAKER DESIGN
AND
ELECTRONICS INNOVATION
IN PARTNERSHIP

A LIMITED EDITION
THE SCM150ASLT
POWERED BY ATC’S P6 DUAL MONO 3-WAY DISCRETE POWER AMPLIFIER.
Another milestone has been reached for ATC and me.
It is 45 years since the founding of the company and ATC is still privately owned.
My son,William, is now Managing Director and our aim remains a simple one:
to manufacture the best loudspeakers and audio electronics that money can buy.
The SCM150ASLT active loudspeaker represents the pinnacle of performance in ATC’s range
of loudspeaker systems and, when matched to the distinctive P6 power amplifier with its
high resolution dual mono design, the result is a system of exceptional performance
providing an open window to your music.
The SCM150ASLT / P6 combination is a limited edition of just 22 pairs.
This 3-way active monitor incorporates our latest drive unit technology including the new
25mm neodymium soft dome SH25-76S super dome tweeter, the 75mm soft dome SM75-150S
super dome midrange and the SB75-375SL super linear bass driver.
The cabinets are manufactured by our own craftsmen, whom we believe represent the pinnacle
of the craft; each enclosure finished in selected European Crown-Cut Walnut veneer and
detailed with PVD nickel badge, input panel and bespoke limited edition plinth.
The P6 is a dual mono, 3-way, discrete active power amplifier housed in an elliptical billet
aluminium chassis exquisitely machined and finished.
On behalf of the entire team here at ATC I would like to thank you for choosing
the SCM150ASLT and P6 Limited Edition. If like me you live for music and the faithful
reproduction of it I sincerely hope that you will enjoy many hours of happy listening
and cherish your purchase for years to come.
In fact I know you will.
BILLY WOODMAN
Founder and Chairman
ATC Loudspeaker Technology Limited
2/3

FROM CASTLEMAINE, AUSTRALIA
TO ASTON DOWN, ENGLAND:
THE ATC STORY.
In a world dominated by huge, faceless global corporates, large scale automation and bland ʻme
tooʼproducts, how is it that a niche business such as ATC can not only survive, but flourish?
Without doubt the core to the Companyʼs success lies in it remaining a small, privately-
owned family business, designing and building – by hand – extraordinary products.The design,
development and vast majority of manufacturing is still carried out in-house, in England, by a
team of hugely talented, dedicated staff, many of whom have remained loyal to the Company
for more years than theyʼd care to remember.
Diversity has also played a vital role.There are few companies that have been as capable
as ATC in establishing such an influential presence in both consumer hi-fi and professional
markets. Consequently,ATC loudspeakers and electronics can be found reproducing music in
domestic listening rooms and home cinemas, in addition to being the go-to source for accurate
monitoring and sound reinforcement for some of the most highly regarded recording studios
and concert halls throughout the world.
While ATCʼs business model is strictly performance engineering led, the Company is
certainly not afraid of bucking trends or pursuing radically different paths to those that their
ʻcompetitorsʼhave chosen. Itʼs always been that way.
SO, HOW DID IT THE ATC STORY BEGIN?
Itʼs 1974, London, England, and the entire country is shivering in the grip of the ʻThree-Day
Weekʼ– an attempt by the British Government to conserve electricity as the production of
which had been severely limited due to industrial action by coal miners. So serious is the crisis
that even television companies have been required to cease broadcasting at 10.30 pm in a bid
to conserve energy.
Billy Woodman couldnʼt have chosen a more challenging time to start a new business.
But he did. In May that year his fledgling company, Acoustic Transducer Company Ltd, was
incorporated.The Company began by building and selling individual loudspeaker drive units –
it would be another four years before ATC presented its first fully integrated loudspeaker
system to an unsuspecting public, the ground-breaking, uniquely styled S50 Studio Control
Monitor.The 28 year old Billy Woodman may have been the new kid on the block, but sound
reproduction was about to take a completely new direction.
PIANO NEVER EVER SOUNDED RIGHT
Earlier, as a student, Billy studied Electrical Engineering at the Bendigo Institute of Technology,
Australia, graduating in 1968. However, he was continually frustrated by the way the loud-
speakers in his own hi-fi system reproduced piano, voice and strings, recalling that “Piano never
ever sounded right when reproduced”.This led him to start thinking about the causes and how
reproduction of voice, violin and piano in particular could be improved.
One such idea was of a diaphragm being driven at its edge (small diaphragm, large diameter
voice coil, large power handling and therefore large dynamic range).With his studies in
Electrical Engineering complete, Billy wrote his final year thesis on loudspeaker design.
At the age of 22 and newly qualified, Billy started work as a junior laboratory engineer in the
research department of the Melbourne-based Rola Company Aust Pty Ltd. Projects there
included research into commercial, power, public address and hi-fi loudspeaker drive units.
But it wasnʼt long before the young Mr Woodman was setting his sights slightly further
afield...
THE BEST ENGINEER THEY WOULD EVER FIND
In August 1970 Billy decided to travel to the UK. Intending to stay for only six months or
so, he wrote to the Managing Director of Goodmans Industries in London. Goodmans was at
that time the largest loudspeaker manufacturer in Europe. In his letter Billy modestly told them
that “I am the best engineer they would ever find and could they please give me a job!” He got
the job!
On arrival in England, Billy joined GoodmansʼR&D laboratory team responsible for the
engineering of the 3000 or so products manufactured at the time and the design and develop-
ment of new drive units and hi-fi systems. Goodmans’ policy was to encourage further educa-
tion and all laboratory engineers studied for an MSc in Applied Acoustics at London University.
Billy graduated in 1973.While there, working on special projects with the aid of a master tool
4/5

maker, Billy designed and built a precision winding machine to edgewise-wind fine flat rolled
copper ribbon wire voice coils.The technique all but eliminates air gaps in the coil winding
resulting in improved thermal capacity, a greater volume of copper in each coil improving drive
motor efficiency, closer tolerance voice coils and greater power handling capacity. These coils
were used in Goodmans professional PA loudspeaker drive units. Billy’s time at Goodmans was
also spent on the design and development of drive units for both PA and hi-fi including the
development work on devices with highly damped soft dome diaphragms which proved to have
wide controlled dispersion, high power handling capability and exceptional midrange clarity.
Billyʼs work on edgewise coil winding technology was not entirely original however, as
Westrex UK, famous for its cinema sound and James Lansing (whilst working for Westrex) had
previously worked on this technique. Notwithstanding, Billy was convinced that both aspects
could be developed to their full potential with better engineering and new materials, an ambi-
tion that he later realised as both were to become major features of all ATC transducers.
Convinced that there was a market waiting to be exploited for “far more accurate loud-
speaker drive units than those available in the guitar amp boxes of the time”, Billy began to put
together the company that was to become ATC...
Formed to produce custom drive units for the professional sound industry, Billy incorporated
the Acoustic Transducer Company, ATC, on 26th April 1974.
A LANDMARK YEAR
Fast forward and, due to a number of factors, the early 1980s proved to be a difficult
period for Billy and ATC with two changes of premises and the original company becoming
insolvent (Loudspeaker Technology Ltd subsequently being formed and acquiring its assets).
However, by 1985 all the hard work was finally beginning to ʻpay dividendsʼ. As it turned out,
it was to become a landmark year for ATC. Not only did ʼ85 see the launch of the Companyʼs
signature Tri-Amplifier Mono Amp Pack (providing the power behind ATCʼs future active loud-
speakers systems), but it was also the year that development work started on the ground-
breaking SCM50 monitor.
And, as if that wasnʼt enough, with the lease about to expire on ATCʼs business premises in
London, the search had begun for a suitable place to relocate. By mid-summer the business had
moved to Gypsy Lane,Aston Down, Stroud, where the Company remains to this day.
With both work and home conveniently located in the glorious Cotswolds countryside itʼs
EARLY DAYS.
THREE OF THE
ORIGINAL
ATC DIRECTORS
AT AN AUDIO
EXHIBITION
IN THE 1970S.
LEFT TO RIGHT:
BRIAN GILLECE,
HANS FREYTAG AND
BILLY WOODMAN
SIT BENEATH A
GIANT GRAPHIC OF THE
COMPANY’S ORIGINAL
12" DRIVE UNIT
BELOW:
PUBLICITY SHOT OF THE
COMPANY’S FIRST EVER
HIFI LOUDSPEAKER,
THE S50.
ITS ICONIC SHAPE
CAUSING QUITE A STIR
AT LAUNCH IN THE
LATE 1970S
not surprising that Billy continues to be involved in the running of the business and the devel-
opment of new products. Under his guardianship ATC has grown from a fledgling manufacturer
supplying a small range of drive units to becoming a company building some of the worldʼs
finest loudspeaker systems and electronics for both consumer hi-fi and professional markets.
A REMARKABLE LEGACY
As Billy begins to take a more ʻback seatʼrole in day-to-day business activities, a new genera-
tion of highly talented ATC design, acoustic and electronics engineers is now coming to the
fore.With his son,William, now also having joined the Companyʼs Board of Directors as
Managing Director with responsibility for the day-to-day running of ATC, everything is in place
to ensure that the Company and, in particular, Billy Woodmanʼs remarkable legacy, will continue
to remain in safe hands for years to come.
6/7

From modest beginnings since its inception in 1974, ATC has grown to become one of the very few
manufacturers enjoying success and recognition across both domestic and professional audio.
By selecting ATC you join a group of music lovers, professional audio engineers, educators, studios and
musicians across the world that understand the value of the engineering that goes into every ATC
loudspeaker and electronic component.
Few ATC products better represent our quest for acoustic engineering innovation and excellence than the
SCM150ASLT Limited Edition floorstanding active 3-way loudspeaker, an exclusive system representing the pinnacle
of ATC engineering, craftsmanship and performance.
With production being strictly limited to just twenty-two pairs worldwide, each is individually hand-built in
England to exacting tolerances. As you might expect, this exclusive new model raises breathtaking performance to a
level that only ATC’s legendary drive unit and electronics design can achieve: naturally sounding, effortless power
delivery combined with wide, even dispersion for pin-point imaging being key characteristics.
Each enclosure is constructed by our own team of cabinetmakers from 18mm MDF and expertly finished in
high-gloss, hand-selected European Crown-Cut Walnut real wood veneer.
Within the 150 litre enclosure you’ll find ATC’s latest proprietary
drivers: the outstanding SH25-76S tweeter, the highly acclaimed
SM75-150 S Soft Dome Mid driver and 375mm SL (Super Linear)
Spec Bass driver.
A front-facing port completes the baffle, while a removable cloth grille is also included. PVD-coated stainless steel
‘Limited Edition’ badging ‘signs off’ the cabinet’s front face.
The cabinet sits securely on a fully adjustable spiked plinth that is unique to this limited edition model designed,
incidentally, by our Company’s founder, Billy Woodman.
At the rear a flush-fitting PVD-coated stainless steel plate can be found incorporating a bespoke LEMO®multi-pin
socket for connection to the loudspeakers’ outboard tri-amp power pack.
Each pair of loudspeakers is driven by its own distinctively designed dedicated ATC P6 dual-mono 3-way,
6-channel outboard power amplifier. Providing 200W low frequency, 100W mid frequency and 50W high frequency
Class AB power to each loudspeaker, the P6 features ATC’s own 3-way electronic crossover incorporating phase
correction and momentary gain reduction. Amplifier/loudspeaker connection is via aerospace-grade LEMO®
connectors and custom ATC cabling (supplied to customer specification).
By combining our unique acoustic and electronics engineering capability with exquisite cabinetmaking, the Limited
Edition SCM150ASLT active provides a rare, once-in-a-lifetime opportunity for twenty-two lucky hi-fi enthusiasts to
enjoy a very special connection with our Company’s treasured heritage.
Built to give a lifetime of service and musical pleasure, as with all ATC products, your SCM150ASLT Limited Edition
system will be supported by a 6 year warranty.
8/9
INTRODUCING THE
SCM150ASLT LIMITED EDITION

SCM150ASLT
LIMITED EDITION
Specifications
OVERVIEW
n
This Limited Edition of just 22 pairs
redefines music reproduction in the home.
Exquisitely finished and offering true full range sound,
the combination of world-class transducer and
electronic design engineering delivers a staggering
level of clarity, neutrality, transient response and
power delivery that’s simply effortless.
FEATURES
n
ATC SH25-76S (S-SPEC) Tweeter.
n
ATC SM75-150 S Soft Dome Mid driver.
n
Latest ATC 375mm SL Spec Bass driver.
n
Massive ATC motor assembly.
n
Wide, even dispersion for pin-point imaging.
n
6 year warranty.
n
Hand-selected European Crown Cut Walnut
real wood veneer in high gloss finish.
Drivers : HF : SH25-76S 25mm Dual Suspension Tweeter
MF : SM75-150S Super Dome Mid-Range Driver
LF : SB75-375SL Super Linear Bass Driver
Amplitude Linearity (±2dB) : 60Hz–17kHz
Frequency Response (-6dB) : 25Hz–25kHz
Matched Response : ±0.5dB
Dispersion : ±80° Coherent Horizontal, ±10° CoherentVertical
Max SPL : 117dB
Crossover Frequencies : 380Hz & 3.5kHz
Connectors : LEMO aerospace-grade
Cabinet Dimensions (HxWxD) : 1395x606x626mm / 54.9x23.9x24.6" (inc. plinth and spikes)
Overall Weight : 146kg / 321.8lbs (inc. shipping crate), 116kg / 255.7lbs (approx exc. shipping crate)
ATC reserves the right to vary products and specifications
without prior notice.
PLINTH : DESIGNED BY ATC FOUNDER AND CHIEF PRODUCT DESIGNER, BILLY WOODMAN, INCORPORATES PVD-COATED STAINLESS STEEL,
A BEAUTIFUL HARD WEARING AND DISTINCTIVE FEATURE THAT IS CARRIED OVERTO THE LOUDSPEAKER’S BADGING AND REAR PANEL
(PICTURED ABOVE RIGHT)
PROPRIETARY DRIVERS THROUGHOUT : SIX YEARS IN THE MAKING, ATC’S NEW
SH25-76S TWEETER IS UNUSUAL GIVEN ITS SIZE, BEING A DUAL SUSPENSION
DESIGN, EMPLOYING BOTH AN UPPER AND LOWER SUSPENSION. JOINING IT
IS THE COMPANY’S SM75-150 S SOFT DOME MID AND LATEST 375MM SL SPEC
BASS DRIVER
10/11

P6 Specifications
OVERVIEW
n
This high-performance Class AB dual mono
power amplifier has been designed to provide
dedicated amplification and optimally matched
active crossovers for the SCM150ASLT
Limited Edition loudspeaker.
FEATURES
n
Dual-Mono 3-way design (total 6 channels).
n
2 x 350W total output power:
2x (200W LF, 100W MF, 50W HF).
n
Ultra low noise discrete design throughout.
n
3-way active crossovers with phase equalization.
n
Billet and extruded aluminium chassis construction.
n
6 year warranty.
Output Power/Stereo Ch. (RMS) : HF : 50 watts into 6 ohms, MF : 100 watts into 16 ohms, LF : 200 watts into 8 ohms.
Input Sensitivity : 1V RMS
Input Impedance : 5k ohms
Frequency Response : 5Hz – 200KHz ±0.1dB (ignoring mid amp filters)
Signal/Noise Ratio : Better than 105dB
TDH : Better than 90dB/0.0032%
Filters : All active with overload protection
Power Requirements : Voltage: 110, 115, 230 (factory set)
Frequency : 50/60Hz (region dependent, factory set)
Dimensions (HxWxD) : 427x634x318mm / 16.8x25.9x12.5"
Weight : 50.5kg / 111.1lbs
Power Requirements : Voltage : 110, 115, 230V (factory set), Frequency : 50/60Hz (factory set)
ATC reserves the right to vary products and specifications
without prior notice.
EXCEPTIONAL CLARITY :
P6 HAS A HIGH SIGNAL TO NOISE RATIO OF
MORE THAN 105 DECIBELS WHICH, PAIRED
WITH THE ULTRA LOW NOISE DISCRETE
DESIGN THROUGHOUT, PROVIDES CLEAR
AND DETAILED AUDIO REPRODUCTION
REAR PANEL : PROFESSIONAL XLR INPUTS (PREAMPLIFIER/DIGITAL SOURCE), AEROSPACE-GRADE LEMO MULTI-PIN LOUDSPEAKER OUTPUT SOCKETS
12/13

USER GUIDE
SYSTEM INSTALLATION AND OPERATION
14/15

Please read the following user manual section fully.
WELCOME
16/17

12. Grounding or polarisation – precautions should be taken so
that grounding or polarisation means for the appliance are
not defeated.
13. Water and moisture - the appliance should not be exposed
to dripping or splashing and no objects such as vases, should
be placed on the appliance.
14. Ventilation - a minimum of 80mm is required at the rear of
the appliance to ensure sufficient ventilation.The ventilation
should not be impeded by covering the appliance with items
such as table-cloths, curtains etc. Further, the appliance
should not be built into an installation, such as a bookcase
or cabinet, that may impede the flow or air around the
appliance.
15. Power sources -The appliance is of Class1 construction and
shall be connected to a MAINS socket outlet with a
protective earthing connection.
16. The Mains disconnection switch is located on the rear panel.
Pressing the switch upwards will turn the unit on.The unit
can be turned off by downward pressure on the switch.
Please allow enough room around the unit to ensure the
switch is readily operable when the unit is in use.
1:Unpacking & Handling
SCM150ASLT Limited Edition loudspeakers and P6
active power amplifier are large heavy items and should
be handled with care. Always employ a second person to
assist in moving them. Unpacking is best carried out on the floor,
with adequate open space around the carton or crate, preferably
close to their final position.
SCM150ASLT Limited Edition Loudspeakers
1. Open the crate and remove all loose items.
2. With the help of another person, lift the crate so that the
loudspeaker is standing upright.
3. Carefully pull the loudspeaker out from the crate.
Be careful not to damage the grill or drivers.
Remove felt bag.
4. The speaker can now be positioned in the listening/control
room.
P6 Active Power Amplifier
1. Open the carton and remove all loose items.
2. Open the lower carton flaps and remove the box, leaving the
amplifier standing in the stratocell packaging.
3. Remove the top section of stratocell.
4. With the help of a second person, remove the lower piece
of stratocell.
5. The amplifier can now be positioned in the listening room.
Safety Warnings
1. Read instructions – all the safety and operating instructions
should be read before the appliance is operated.
2. Retain these instructions – the safety and operating
instructions should be retained for future reference.
3. Heed warnings – all warnings on the appliance and in the
operating instructions should be adhered to.
4. Follow instructions – all operating and other
instructions should be followed.
5. Heat – the appliance should be situated away from heat
sources such as radiators, stoves or other appliances that
produce heat.
6. Power cord protection – power supply cords should be
routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords at plugs, convenience
receptacles and the point where they exit the appliance.
7. Cleaning – the appliance should be cleaned only as
recommended by the manufacturer.
8. Unattended periods – the power cord of the appliance
should be unplugged from the outlet when left unused for a
long period of time.
9. Object entry – care should be taken so that objects do not
fall into the appliance.
10. Damage requiring service – the appliance should be serviced
by qualified service personnel when:
i. the power supply cord or the plug has been
damaged.
ii. objects have fallen, or liquid has been spilled into
the appliance.
iii. the appliance has been exposed to rain or other
serious liquid exposure.
iv. the appliance does not appear to operate normally
or exhibits a marked change in performance.
v. the appliance has been dropped or the cabinet
damaged.
11. Servicing – the user should not attempt to service the
appliance beyond those measures described in the operating
instructions. All other servicing should be referred to
qualified service personnel.
18/19

2:Monitor Placement
The subjective performance of any monitor loudspeaker will be
influenced by the acoustic character of the room in which it is
used, and its position within the room. Most often monitors are
installed in rooms which are comfortable to sit and talk in.A
mixture of carpets, curtains and soft furnishings will help ensure
that middle and high frequencies are reasonably well controlled.
There may however be low frequency problems; either too
much or too little bass.
To minimise low frequency problems the monitors should be
kept away from corners or walls. Start with them positioned 1
metre from the side walls and 2 metres from the back wall. For
stereo listening, loudspeakers should be positioned so they form
an equilateral triangle with the listening position (See Fig.1).
All ATC 3-way loudspeakers are designed with the mid-range
dome as the reference acoustic axis.With this in mind, the
loudspeakers should be positioned with the mid-range dome
at, or slightly below ear level (See Fig.2).
All rooms vary and it is a good idea to experiment with both
the listening and speaker position until a good compromise is
reached. Please consult with an experienced professional
acoustician if necessary.The SCM150ASL Limited Edition feature
an asymmetric (offset) driver array and should be positioned
such that the midrange driver and tweeter are inboard.
30°
30°
distance x
distance y
distance z
distance x = distance y = distance z
Loudspeaker Positioning - Stereo
acoustic axis:
mid-range driver
3-way systems
Fig. 1 Stereo Listening
Fig. 2 Reference Acoustic Axis
3:Listening
The ear and brain tend to interpret distorted sound as loudness
and thus underestimate the actual level of undistorted sound.
SCM150ASLT Limited Edition loudspeakers and P6 power
amplifier demonstrate very much lower levels of distortion
than conventional systems of a similar size and it is therefore
advisable to begin listening at an artificially low level and carefully
increase the volume.
It is also possible for the system to produce sufficient sound
pressure levels for your ears themselves to become a source
of distortion and make the sound appear harsh.Any audible
distortion indicates that either the system or your ears are being
overloaded and that the volume level should be reduced.
4:Signal Cable Options
Balanced cable configuration is the preferred option, however
unbalanced connection is possible. Fig. 3 illustrates the pin
wiring for the XLR input. Figs. 4 and 5 illustrate the signal cable
connections required for both balanced and unbalanced options.
Balanced (XLR to XLR) connection offers lower noise and
better immunity to “hum” pick-up. Unbalanced (XLR to Phono
or Two-Pole Jack) connection carries risk of hum caused by
multiple signal earths. Hum problems resulting from unbalanced
connection may be reduced by making ONE of the following
modifications to the signal cable connections: If the driving
preamplifier is “double insulated” (i.e. has no mains earth),
disconnect the signal cable screen at the RCA Phono plug end.
Alternatively, disconnect the signal cable screen at the XLR end.
This second option will make the source the reference signal
earth.
Two Core Screened Cable
3 Pin Male XLR
Connector
3 Pin Female XLR
Connector
To Monitor Input
Hot
Return
Screen
To Source Output
1
2
3
1
2
3
Phono (RCA)
Connector
To Source Output
Two Core Screened Cable
3 Pin Male XLR
Connector
To Monitor Input
1
2
3
Hot
Screen
Return
Pin 1, Screen
Pin 2, Signal (hot)
Pin 3, Signal (return)
21
3
PUSH
Fig. 4 Balanced Cable
Fig. 5 Unbalanced Cable
Fig. 3 Input Connection Pins
20/21

5:Operation
Fig. 6 illustrates the connection and control panel for the
P6 Power Amplifier. Each feature is described below:
Mains Inlet: The supplied mains power lead (appropriate to the
local territory) should be connected here. Ensure that the mains
voltage specified on the panel corresponds with the local supply
voltage.
Power Switch: Switches on the amplifier.
Fuse Holder: Should the amplifier fail to switch on when the
power switch is operated, the fuses should be inspected. Lift out
the fuse holder cover using a flat-blade screwdriver, remove the
fuse and inspect it for damage. If required, an identically rated
and specified replacement should be fitted. It should be stressed
however, that fuses often fail because of a serious electrical fault.
If this is the case, then simply replacing the fuse will only result
in another fuse failure.The amplifier should be returned to ATC
for repair if a second fuse fails.
Input Sockets: The audio signal cable should be connected
here. Balanced or unbalanced cables may be used
(See Section 4).
Output Sockets: The 5-metre cable fitted with 10-pin Lemo
connectors provided by ATC should be connected here.This
provides the high-level audio connection to each respective
loudspeaker.
6:Connection
The P6 Active Power Amplifier requires 5 cable connections in
total: one for mains power, one for each audio input and one for
each audio output.
The mains cable is specifically supplied to comply with local
statutory safety approvals and alternatives should not be
substituted. If you intend to use your monitors in an alternative
territory, please contact ATC for advice.The mains connection
must always be earthed.
Signal cables and plugs (not supplied) should be of a good
quality and XLR terminated. Poor cable and plug quality will
compromise the performance of your monitors.
The signal input pin configuration is illustrated in Fig. 3.
Fig. 6 P6 Connection and Control Panel
7:Care and Maintenance
High technology material finishes are used in these products.
The surfaces are durable and with a little care can be kept as
good as new even under conditions of heavy use. Normally a
dry duster will be all that is required to keep the finishes clean.
Heavy soiling of the loudspeaker cabinet or amplifier surfaces
can be cleaned using a cloth slightly moistened with a non-
abrasive household cleaner. Cleaning of the drive unit diaphragms
is not possible.
There are no components within the speaker that can be
considered expendable, or that would benefit from regular
maintenance.There is no requirement for any kind of routine
service work and there is no schedule for preventative
maintenance.There are no user replaceable parts within the
speaker and in the unfortunate event of any malfunction, repair
should be referred to either the supplying dealer or consultant,
the relevant importer, or ATC.
ATC has every confidence in the quality of each product that it
manufactures.
8:Warranty and Contract
All ATC products are guaranteed against any defect in materials
or workmanship for a period of two years from the date of
purchase.Within this period, we will supply replacement parts
free of charge provided that the failure was not caused by
misuse, accident or negligence.
Purchasers who complete and return the Warranty Card will
have their warranty period extended up to a period of six years
from the date of purchase.
This guarantee does not limit statutory rights.
22/23

SCM150ASLT
LIMITED EDITION
ACOUSTIC
ENGINEERS
®

Acoustic Transducer Company is the trading name and is the registered trade mark of Loudspeaker Technology Ltd.
Loudspeaker Technology Ltd Gypsy Lane, Aston Down, Stroud, Gloucestershire, GL6 8HR, United Kingdom
Telephone [phone] Fax [phone]
Email: [email protected] Website: www.atcloudspeakers.co.uk
ACOUSTIC
ENGINEERS
®