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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 emigre Billy 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 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 

 

SECTION ONE

I n t r o d u c t i o n

1.0

aerospace or motor sport. 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.

Summary of Contents for SCS70 Pro

Page 1: ... E E R S R A C C O U S T I C E N G I N E E R S Loudspeaker Technology Ltd Gypsy Lane Aston Down Stroud Gloucestershire GL6 8HR United Kingdom Telephone 44 0 1285 760561 Email info atc audio Website www atc audio Acoustic Transducer Company is the trading name is the registered trade mark of Loudspeaker Technology Ltd R P R O S E R I E S ...

Page 2: ...tlet 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...

Page 3: ...mponents 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 S E C T I O N O N E I n t r o d u c t i o n 1 0 aerospace or motor sport But the results are worth the effort and the cost ATC loudspeakers with their unique in house designed drivers combine the best of h...

Page 4: ...n filtered balanced outputs are provided for connection to partnering active monitor loudspeakers or to daisy chain multiple subs 21dB range of gain control three low pass frequency settings polarity switch and a180 degree continuously variable phase setting allow the user to optimise the subwoofer for use with a very wide range of partnering loudspeakers The low pass filter can also be set to Off...

Page 5: ...he subwoofer in the centre of the room equidistant from the two side walls and between the left and right stereo pair must be avoided In the majority of cases this position will result in large irregularities in the frequency response Multiple subs will excite the room from multiple locations and will often give a more even in room response Also a pair of subs can be placed with the same physical ...

Page 6: ...g the effective input level to the amplifier stage by 6dB Balanced cable configuration is the preferred option however unbalanced connection is possible Diagrams 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 b...

Page 7: ... low pass crossover filter via an external processor All filters are of the type 4th order Linkwitz Riley Provides separately buffered and fully balanced outputs with a signal identical to that at the corresponding input terminals The output is unfiltered and unaltered in any way and therefore it is possible to drive a stereo pair of active loudspeakers from these terminals Likewise it is also pos...

Page 8: ...Subwoofer has two LED s mounted in the front facing badge Diagram 6 The LED to the left is a Bi Colour Green Red LED When Green the subwoofer is powered ON when Red the subwoofer amplifier is limiting please reduce the listening level Persistent and or continuously illumination of the Red LED can result in damage to the amplifier or driver The LED to the right is not lit when the subwoofer is oper...

Page 9: ... can be achieved through experimentation with the subwoofer Level Frequency and Phase adjustment Diagram 7 Typical Configuration Stereo playback Mono Sub A monitor controller or preamplifier output is connected to the L and R Inputs of the subwoofer The subwoofer L and R Outputs are connected to the Input of the L and R main monitors In this configuration the Gain switch is normally set to 0dB Dia...

Page 10: ...ng L o u d s p e a k e r m o d e l p a i r BASS REINFORCEMENT EXTENSION OF STEREO SYSTEM SCM12 PRO P1 POWER AMPLIFIER 65Hz 6dB 6dB 0dB 0 SCM20ASL PRO 65Hz 6dB 6dB 0dB 0 SCM25A PRO 50Hz 6dB 6dB 0dB 0 SCM45A PRO 50Hz 6dB 6dB 0dB 0 SCM50ASL PRO 50Hz 6dB 6dB 0dB 0 FREQUENCY LEVEL POT ADJUST FOR BEST BALANCE GAIN SWITCH SINGLE SUB DUAL SUBS PHASE ADJUST TO FINE TUNE POLARITY DIAGRAM 10 S u b s SCS70 1 ...

Page 11: ...of subwoofers the Gain switches may need to be set to 6dB Further subwoofers can be added to the system using the same Daisy Chain method shown The system shown is an example and other configurations are available Recommended initial settings for the Studio Control Subwoofer when used in a multichannel system are shown in Diagram14 Monitor Controller L R C Rs Ls Lfe 0 1 Recommended O Acceptable S ...

Page 12: ... 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 Low Frequency Cut off 22Hz 6dB half space low pass filter set at 80Hz Low Pass Filters 50Hz 65Hz 80Hz 320Hz 6dB 4th order Linkwitz Riley ...

Page 13: ... O N N I N E P h y s i c a l s p e c i f i c a t i o n 9 3 SCS70 PRO SCS70iW PRO R1 300 REMOTE AMPLIFIER WEIGHT 44KG DIMENSIONS SEE DIAGRAM WEIGHT 32 5KG DIMENSIONS SEE DIAGRAM WEIGHT 12KG DIMENSIONS SEE DIAGRAM ...

Page 14: ...ompleted Warranty Card to ATC or by registering the product at www atc audio 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 LoudspeakerTechnology Ltd Gypsy Lane Aston Down Stroud Gloucestershire GL6 8HR United Kingdom Telephone 44 0 1285 760561 Email info atc audio Website www atc audio AcousticTransduce...

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