ATC entry Series Manuel utilisateur
entry series
ACOUSTIC
ENGINEERS
®
user manual
ENTRY MANUAL 040919_ENTRY BROCHURE 13.3 10/09/2019 15:19 Page 1
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.
ATC was founded in London in 1974 by Australian émigré 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 were 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
entry
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more robust components engineered to survive the rigours of high level use for extended periods.
The only way to combine the two is through precision 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
systems still have their place, and ATC engineering skills can still bring remarkable results from them) 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.
series
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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. 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.
6. Ventilation - a minimum of 80mm is required at the rear of
appliances 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.
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 is of Class1 construction
and shall be connected to a MAINS socket outlet with a
protective earthing connection.
9. 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.
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 entry – care should be taken so that objects do
not fall into the appliance.
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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.
16. The SCM19A and SCM40A active loudspeakers feature a
push-in power switch which, when depressed, powers the
unit on. The C1 Sub features a rocker switch which, when
positioned downwards, turns the unit on.
Unpacking & Handling
1. Open the carton and remove all loose items.
2. Fold back both the inner and outer carton flaps and carefully
roll over the carton so that the loudspeaker and all stratocell
caps remain in the carton.
3. Lift away the cardboard carton leaving the loudspeaker
cradled in the stratocell caps.
4. Remove the upper half of the end caps and lift the
loudspeaker away from the packaging.
5. Remove the felt bag and position the loudspeaker in the
listening room.
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1:Monitor Placement
The subjective performance of any monitor loudspeaker will be
fundamentally 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 minimize low frequency
problems the monitors should be kept away from corners or
walls. Start with them positioned around 1 metre from the side
walls and 2 metres from the back. If the balance is bass-light,
the monitors can be moved towards the back walls.
For stereo listening, loudspeakers should be positioned so
they form an equilateral triangle with the listening position
(See Fig. 1). Loudspeaker stand height should be chosen to
position the loudspeaker acoustic axis at, or close to 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. For professional installations the requirements are often
very specific. Please consult with an experienced professional
acoustician if necessary.
Stereo/Satellite
Loudspeakers
1
Monitor Placement
2
Amplification (Passive Models)
3
Connection (Passive Models)
4
Connection (Active Models)
5
Operation (Active Models)
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30°
30°
distance x
distance y
distance z
distance x = distance y = distance z
Loudspeaker Positioning - Stereo
Acoustic Axis
acoustic axis:
mid-point between bass/mid and tweeter
2-way systems
acoustic axis:
mid-range driver
3-way systems
Fig. 1
Fig. 2
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2:Amplification (Passive Models)
The choice of partnering amplifiers for Passive Entry Series
loudspeakers will have significant influences on the performance
of the system. Consider the following when selecting the
amplifier:
■ With any passive loudspeaker there is a trade-off between
low frequency extension and sensitivity. Extended low frequency
response means that sensitivity is relatively low. It is advisable
therefore to select an amplifier of relatively high power
capabilities. Use of an under-specified amplifier will result in the
system sounding distorted at high level and may risk damage to
the loudspeakers.Valve or solid state amplifiers with high output
impedance should be auditioned carefully to establish that their
characteristic reduced damping at low frequencies is acceptable.
Typically, amplifiers with power outputs of 75W+ (continuous
output) will give the best results.
■ The ATC bass/mid driver voice coils are unusually large and
operate in an overhung gap.The result is that the monitors not
only demonstrate extremely low distortion at all levels but also
a greatly enhanced effective dynamic range. This exceptional
distortion performance, also combined with very wide
dispersion, will ruthlessly reveal deficiencies in ancillary
equipment. It is advisable therefore to audition your speakers
with your proposed amplifier and ancillary system. The range of
ATC amplifiers and pre-amplifiers should be your first choice.
3:Connection (Passive Models)
ATC Entry Series monitors are equipped with a “bi-” or
“tri-wire” connection panel that enables separate amplification
of the bass/mid driver and tweeter. Remove the linking bars
between the pairs of terminals if you wish to take advantage of
this facility.
The pairs of binding posts are laid out to match the drive unit
positions with the bass driver pair towards the lower edge of
the input panel. Ensure the multiple amplifiers used for
bi or tri-amping have equal gain and use the most powerful
amplifier for the LF driver. The terminals can accommodate
either stripped cable ends or 4mm plugs.
Always use good quality speaker cable with a 2.5mm2minimum
cross sectional area per conductor (79 strand). Cable of a
smaller cross sectional area or fewer strands is unsuitable.
For cable runs longer than 5m use a significantly heavier gauge
cable. Consult our dealer or consultant for specific cable
recommendations. Ensure that the positive and negative
terminals on each connection panel are connected back to the
corresponding positive and negative terminals on the amplifier.
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4:Connection (Active Models)
Signal Cable Options: Balanced cable configuration is the
preferred option, however unbalanced connection is possible.
Figs 3 and 4 illustrate the signal cable connections required for
each option. 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 (or desk) 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.
Connection: Two connections are required for each monitor:
one for mains power and one for the audio signal.The mains
supply is supplied specifically 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. The signal cable and plug (not necessarily 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 5.
Due to the nature of the electronics in ATC active loudspeakers,
it is quite normal for a sound to be heard from the speaker
when the power is applied or disconnected.The noise heard will
not damage the speaker.Although ATC use the highest grade
components, a different noise may be heard from each speaker
due to slight variations in the amplifier components.
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. 3 Balanced Cable
Fig. 4 Unbalanced Cable
Fig. 5 Input Connection Pins
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5:Operation (Active Models)
Figs 6 and 7 illustrate the connection and control panel for the
amplifiers used in the active SCM40A and 19A monitors.
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 monitor.
Fuseholder: Should a monitor fail to switch on when the
power switch is operated, the fuse should be inspected. Lift out
the fuseholder cover using a flat-blade screwdriver, remove the
fuse and inspect it for damage. If required, a 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
monitor should be returned to ATC if a second fuse fails.
Input Socket: The audio signal cable should be connected
here. Balanced or unbalanced cables may be used (see Section 4.)
Fault LED (SCM19A and SCM40A only): The fault LED
will illuminate if there is a fault in the Amplifier or the heat sink
temperature is too high for safety or reliability.There will be no
output from the Loudspeaker if the LED is on.Turn the Amplifier
off at the mains, remove the Input connector, wait approximately
10 seconds and then turn the Amplifier back on again. if the LED
is still on, leave the Amplifier to cool for 30 minutes and repeat
the above procedure. If after this time the LED still comes on
then contact ATC for advice.
ENTRY MANUAL 040919_ENTRY BROCHURE 13.3 10/09/2019 15:19 Page 10
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