SCM7 (6p) Rev D
Contents
1. 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 I 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 minimise low frequency problems the monitors should be kept away from corners or walls Start with them positioned around 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 All rooms vary and it is a good idea2. User Manual SCM7 Passive MULTICHANNEL a gt ACOUSTICENGINEERS Introduction 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 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
3. 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 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 lt 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
4. at either the system or your ears are being overloaded and that the volume level should be reduced 5 Care and Maintenance High technology material finishes are used in this product 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 can be cleaned using a cloth slightly moistened with a non abrasive household cleaner There are no components within the speaker that can be SCMT Passive Drivers HF 25mm 1 Soft dome Neodynium magnet LF MF 125mm 5 Treated polyester weave Amplitude Linearity 2dB 100Hz 16kHz Matched Response 0 5dB Cut off Frequencies 6dB free standing 62Hz amp 20kHz Dispersion Horizontal Vertical 80 Coherent 10 Coherent Sensitivity sine wave 84dB IW metre Max Continuous SPL 103dB SPL metre Recommended Power Amplifier 50 to 300 Watts Nominal Impedance 8 Ohms Crossover Frequency 2 5kHz Input Connections Binding Posts 4mm Sockets Bi Wire capable Cabinet Dimensions HxWxD 300 x 160 x 205mm Overall Weight 7 0kg 15 4lb Stands Brackets Matching floor stands and wall brackets are available at extra cost The above specifications comply with the following standards Australian Standard Specification No 1127 Sound System Loud
5. cillary system 3 Connection The SCM7 is equipped with a bi wire connection panel that enables separate amplification of the bass mid driver and tweeter Remove the linking bars between the two pairs of terminals if you wish to take advantage of the bi wire facility The terminals can accomodate either stripped cable ends or 4mm plugs Always use good quality speaker cable with a 2 5mm minimum cross sectional area per conductor 79 strand Cable of a smaller cross sectional area or fewer strands is unsuitable For cable runs longer than 10m use a significantly heavier gauge cable Consult your 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 SCMT Passive Specifications 4 Listening The ear and brain tend to interpret distorted sound as loudness and thus underestimate the actual level of undistorted sound The SCM7 like all ATC monitors demonstrates 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 SCM7 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 th
6. speakers Part 5 IEFE Specification Standard No 219 1975 ATC reserves the right to vary products and specifications without prior notice Acoustic Transducer Co is a trading name and ATC is the registered trade mark of Loudspeaker Technology Ltd 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 SCMT Passive 6 Warranty and Contact 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 ATC can be contacted at Loudspeaker Technology Ltd Gypsy Lane Aston Down Stroud Gloucestershire GL6 8HR UK Telephone 01285 760561 Fax 01285 760683 Email info atc gb net Website www atc gb ne
7. t 2 D ACOUSTICENGINEERS Loudspeaker Technology Ltd Gypsy Lane Aston Down Stroud Gloucestershire GL6 8HR United Kingdom Telephone 01285 760561 Fax 01285 760683 Email info atc gb net Website www atc gb net
8. to experiment with both the listening and speaker position until agood compromise is reached For professional installations the requirements are often very specific Please consult with an experienced professional acoustician if necessary 2 Amplification The choice of partnering amplifier for the SCM7 will have significant influence on the performance of the system Consider the following when selecting the amplifier e With any passive loudspeaker there is a trade off between low frequency extension and sensitivity The SCM7 s extended low frequency response means that its 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 levels and may risk damage 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 The SCM7 bass mid driver voice coil is an unusually large 45mm and operates in an overhung gap The result is that the SCM7 not only demonstrates 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 the SCM7 with your proposed amplifier and an
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