ATC SCM20AS LT, SCM20S L User Manual

User Manual: SCM20ASLT • SCM20SL

MULTICHANNEL

ACOUSTICENGINEERS

®

SCM20

SCM20SL

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. Water and moisture – the appliance should not be used near water, for
example near a bathtub, washbowl, kitchen sink, laundry tub, in a wet
basement or near a swimming pool etc..

6. Ventilation – the appliance should be situated so that its location or
position does not interfere with its proper ventilation. For example, the
appliance should not be situated on a bed,sofa, rug or similar surface that
may block the ventilation openings.Similarly,the appliance should not be
built into an installation, such as a bookcase or cabinet,that may impede
the flow of air through the ventilation openings.

7. Heat – the appliance should be situated away from heat sources such as
radiators, stoves or other appliances that produce heat.

8. Power sources – the appliance should be connected to a po w er suppl y only
of the type described in the operating instructions or as marked on the
appliance.

9. Power cord protection – power supply cords should be routed so that the y
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.

10. Cleaning – the appliance should be cleaned only as recommended by the
manufacturer.

11. Unattended periods – the power cord of the appliance should be
unplugged from the outlet when left unused for a long period of time.

12. Object and liquid entry – care should be taken so that objects and liquids
do not fall into the appliance.

13. 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

14. 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.

15. Grounding or polarisation – precautions should be taken so that grounding
or polarisation means for the appliance are not defeated.

1

Safety Warnings

Welcome. In selecting ATC you have chosen an
example of the finest audio engineering
available. ATC was founded on a principle of
engineering excellence, and that principle still
defines our products today. Given the right
opportunities, ATC products will deliver
exceptional audio performance, but the
opportunities will only arise from careful and
thoughtful installation and use. Please read the
following manual fully. It will help you
understand the product and to realise its full
potential. We are happy to answer questions
and offer advice on any issues that arise
through installation or use of ATC products.
Contact details can be found at the back of this
manual.

SCM20

ATC was founded in London in 1974 by Australian emigre Bill Woodman, who still
heads the company today. An enthusiastic pianist and engineer he was naturally
drawn to loudspeaker design and after a period working at Goodmans,where many
of the names that went on to found British loudspeaker companies began their
careers,he struck out on his own.The premise on which ATC began is a simple one,
and one that in many respects is still true today: hi-fi loudspeakers tend to be
detailed and accurate but of limited dynamic range, while professional monitor
speakers tend to express the opposite character. ATC products w er e designed from
the outset to offer the best of both.It’s an easy concept to describe,but surprisingly
difficult to engineer.

The difficulty inherent in designing such loudspeakers is one of scale.Hi-fi levels of
accuracy and detail call for lightweight moving parts and delicate engineering.
Professional monitor levels of performance however demand far more robust
components engineered to survive the rigours of high level use for extended
periods.The only way to combine the two is through pr ecision engineering of a class
and scale more often associated with aerospace or motorsport.But the results are
worth the effort and the cost. ATC loudspeakers, with their unique in-house
designed drivers,combine the best of hi-fi and professional to devastating effect.

ATC has become synonymous with active systems. Choosing to offer active
loudspeakers (where the passive crossover network is replaced by active filters and
multiple power amplifiers) is simply a result of the uncompromising attitude to
loudspeaker design.While passive systems still have their place,and ATC engineering
skills can still bring remarkable results from them,“active” is a fundamentally better
solution to the problems posed by accurate,high level music reproduction.The ATC
instinct is always for the better solution.Not cheaper,not quicker,but better.

It was the development of active loudspeakers that first brought ATC into
electronics design and engineering. Active speakers demand multiple power
amplifiers so ATC from the mid 1980s became not just a loudspeaker manufacturing
company but an electronics manufacturer too.The further step from electronics for
active speakers to a range of stand-alone amplifier products was natural and now
means that ATC engineering is available from the recording desk or CD player
output to the ears.

From modest beginnings ATC has grown to become one of the very few
manufacturers successful across both domestic and professional audio.By selecting
ATC you join a group of music lovers, professional audio engineers, studios and
musicians across the World that understand and value the engineering that goes into
an ATC product - and the sound that comes out.

Introduction

2

Contents

Page 2 Introduction
Page 3 SCM20ASLT

Section 1 Monitor Placement
Section 2 Connection
Section 3 Signal Cable Options

Page 4 Section 4 Operation

Section 5 Listening
Section 6 Care and Maintenance
Section 7 Warranty and Contact

Page 5 Specifications
Page 6 SCM20ASL

Section 1 Monitor Placement
Section 2 Amplification
Section 3 Connection

Page 7 Section 4 Listening

Section 5 Care and Maintenance
Section 6 Warranty and Contact

Page 8 Specifications