User Manual: CA2 Preamplifier SCA2 Preamplifier P1 Power
Contents
1. SPA2 150 high performance dual mono power amplifier left output SELECT INPUT TYPE BEFORE CONNECTION Designed and manufactured by Acoustic Transducer Co Gypsy Lane Aston Down Stroud Gloucestershire serial No GL6 8HR England CER ere trading name and 4 is the registered Trade Mark of Loudspeaker Technology Ltd inputs negative return to manufacturer for disposal NO USER SERVICEABLE XLR pint gnd pin2 ve pin3 ve PARTS INSIDE balanced 5 3 Signal Cable Options Balanced cables are always the preferred option for the SPA2 150P 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 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 5 4 Outputs Loudspeaker connections are made to the SPA2 150 through WBT connectors on2. Resistive Load Resistive load is set by selecting a link for the appropriate capacitance value as illustrated in Diagram 3 If no link is selected the default resistive load is 47 kilohms appropriate for the majority of moving magnet cartridges A link in the 50 position will reduce any selected load by 50 ohms For example links in the 200 position and 50 position give a total load value of 150 Cartridge suppliers and manufacturers will be able to provide details of the loading and gain settings appropriate to their products On some occasions there will be no specific recommendation for the capacitive load on moving coil cartridges In these cases it is best to assume no capacitance need be selected no links used The rear panel ground terminal should be used to connect the pick up arm earth lead 2 3 Outputs The SCA2 rear panel illustrated in Diagram carries 3 Pin Male XLR sockets for balanced main left and right output unbalanced Connector main main left and right output and two unbalanced tape record outputs Choice between the balanced and unbalanced main outputs will depend on the input capabilities of the following power To Preamp Output Pin ground amplifier or active speakers Use the balanced option in preference if both options are possible Connections to the primary output XLR sockets follow the convention of pin to ground pin 2 to signal hot and pin 3 to signal return si
3. Output volume adjustment is achieved through a precision motorised potentiometer Mute gain and standby functions are also accessible from font panel push buttons Mains power is applied from a rear panel mounted switch All SCA2 functions are duplicated on the ATC SCA Remote control handset 2 2 Inputs The SCA2 can accept two balanced XLR inputs and six unbalanced RCA phono style inputs 2 as part of tape record listen sets The rear panel and input sockets are illustrated in Diagram The input types and their identifying legends are illustrated in following Table A The AUX 2 input sockets will function as a high sensitivity phono input if the optional SPH2 RIAA Vinyl Board is installed The RIAA circuitry can be configured to accommodate a wide selection of phono cartridge types by setting combinations of board mounted links Access to the board is gained by removing the top panel of the preamplifier Diagram 2 illustrates the position of the links on the board while Diagram 3 and Table B detail the cartridge gain and input matching options available Links are moved by pulling them gently away from the board with a small pair of pliers and are replaced in the appropriate positions as shown in the diagrams Unused links can be parked on the board by setting them at right angles on unused pins The SPH2 board is split into two identical channels For the sake of clarity on the diagrams the settings for only one ch
4. active mode In Standby mode the Standby Indicator glows RED Operating the Standby function from either the front panel or the remote handset will switch the CA2 into active mode The RED indicator will extinguish and be replaced by the Input select indicator showing the current selection in GREEN Operating the Standby function again will return the CA2 to Standby mode Inputs are selected by rotating the input select control in either direction The control has continuous movement When it is moved to the last input further rotation will select the first input A separate tape loop is included with a Monitor option selected by a single push button on the front panel The tape output will have the same signal as selected by the rotary input select control Operation of the Standby or tape monitor controls will not affect this output providing mains power is maintained Diagram 6 CA2 front panel and controls function volume monitor standby o av o G a Preamplifier Output level is controlled by the rotary Volume control on the front of the unit the position of which is indicated by a black pointer Rotating the control clockwise will increase the output level It is good practice to lower the volume setting before switching on the preamplifier or any associated equipment or while changing the input selection Unity gain though the CA2 from any of the line level inputs is indicated by the OdB pr
5. driven Continuous average gt 150 Watts Frequency Response 3dB lt 2Hz gt 400kHz Distortion IkHz 8 Ohms dB below full power lt 0 002 95dB Input Sensitivity 350mV 150 Watts 8 Ohms kHz Input Impedance 20k Ohms S N N Ratio gt 100dB Wideband Crosstalk gt 90dB 10Hz 20kHz Absolute Phase Zero Degrees Phono Power Requirements 100 115 230V factory set 50 60Hz Power Consumption OVA Standby 500VA Maximum Dimensions H x W x D Including terminals 222 x 222 x 222mm 22 x 222 x 22 inches Weight kg lbs Net 22kg Ibs Packed E amp OE The policy of Loudspeaker Technology Ltd is that of continuous design and development We reserve the right to change specifications without prior notice Power Amplifier 5 1 Description The SPA2 150 is a high quality power amplifier designed to partner ATC passive monitors and other loudspeaker systems It is capable of output power considerably in excess of specification and incorporate the same gain reduction and loudspeaker protection circuits as ATC s active monitors This ensures that even when working at very high levels the amplifier is held back from clipping so improving the subjective performance and protecting the loudspeakers from damage The amplifier incorporates switch selectable balanced and unbalanced signal inputs on XLR and RCA phono sockets respectively Lou
6. identical to that of the PI except that If the push button is in the amplifier will power up in active mode indicated by a GREEN light on the front panel the remote control will be inoperative If the push button is out the unit will power up in Standby indicated by a RED light on the front panel the P2 also features fault monitoring of clip events overload and output stage dc offset The events are displayed via additional LEDs mounted in the front panel central indicator labeled clip and error left PI amp P2 Power Amplifiers and error right Clip events are displayed by a momentary blinking of the clip LED If a number for clip events occur in a short space of time overload then the amplifier will shut down into protect mode and one of the front panel error LEDs will be lit The amplifiers standby function will need to be cycled to restore normal operation However the amp is likely to switch quickly back to protect mode unless the output level has been reduced prior to reset These features are to ensure the longevity of the amplifier and protect loudspeakers from potential damage Please take note 3 5 Specifications PI Pro and P2 Pro Operation of these two variants is exactly the same as the P2 Hi Fi except for the added features of a front panel mounted standby button and a rear panel mounted remote standby trigger input The remote tri
7. A2 is switched from standby to active mode This precautionary feature provides an opportunity for the volume and input settings to be checked before audio is passed to the power amplifiers If all is well the SCA2 may be brought into full operation by pressing the Mute function The Mute indicator will extinguish The Mute function can be used at any time to silence the system Inputs are selected by rotating the Monitor select control The green indicator next to each monitor option will illuminate to indicate selection The control has continuous movement When it is moved to the last input further rotation will select the first input Volume level is adjusted by rotating the Level control A red indicator on the control indicates the level selected Volume level can be reduced immediately by 12dB by operating the Gain function The Gain indicator illuminates to indicate its use cd Ocd bal Ocd bal aO Otuner Oauxt Oaux2 standby reset Otuner Oauxt Oaux2 Optimum sound quality will be achieved when the SCA2 has reached normal operating temperature and for this reason it is recommended that it be left in standby mode when not in use It is a wise precaution however to switch off the SCA2 from the rear panel power switch if it is to be left unused for an extended period The Record select control selects the input source routed to the tape outputs The green indicator next to each record option w
8. DIN gt 110dB IEC A Crosstalk gt 90dB 10Hz 20kHz Damping Factor gt 400 Absolute Phase Zero Degrees Phono Zero Degrees XLR Pin 2 hot XLR CMRR 100Hz 10kHz gt 80dB Power Requirements 100 115 230V factory set 50 60Hz Power Consumption OVA Standby 500VA Maximum Dimensions H x W x D Including terminals 146 x 440 x 426mm 5 75 x 17 3 x 16 8 inches Weight kg lbs Net 22kg Ibs Packed E amp OE The policy of Loudspeaker Technology Ltd is that of continuous design and development We reserve the right to change specifications without prior notice 21 gt 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
9. ONO input sockets function as a high sensitivity phono input All inputs are via RCA phono connectors Diagram I CA2 rear panel and connection sockets serial no MAINS INPUT 50 60Hz AY CA2 aux2 POWER High Performance O consuMeTioN Stereo Preamplifier sub out right left preout recout recin aux1 tuner cd phono NO USER SERVICEABLE PARTS INSIDE power aN aN X 2 OAC acon 0 0O FoR Disposa Designed and manufactured by EEPE CE Acoustic Transducer Company coustic Tranducer Co is a trading name Gloucestershire GL6 8HR and USis the registered Trade Mark of fuse England CHECK VOLTAGE BEFORE USE Loudspeaker Technology Ltd 230V T250mA 115V T500mA 100V T500mMA The phono amplifier can be configured to accommodate a wide selection of phono cartridge types by setting combinations of the board mounted jumpers links Access to the phono stage is gained by removing the cover of the preamplifier Diagram 2 illustrates the position of the jumpers on the board while Table A details the cartridge matching options available Pulling them gently away from the board with a small pair of pliers and replaced in the appropriate positions as shown in the diagram moves links Unused links can be parked on the board by setting them at right angles on unused pins Jumpers J2 and J5 set the input load for each channel of the cartridge With the jumper in place the load is 100 ohms With the jumpers r
10. Removed 47kQ Position A I ImV Fitted Fitted 100 Position B 0 7mV Fitted Removed 47kQ Position B 1 3 Outputs Diagram 3 output socket pins The CA2 rear panel illustrated in Diagram carries sockets for main left and right output tape left and right output left and right summed mono output and an output for stereo Pin 2 Signal hot Pin 3 Signal return headphones Use of the headphone jack will mute the output Pin I ground from the main stereo output and also the sub output Connections to the main output may be from RCA phono plugs or XLR plugs Connections to the XLR output sockets follow the convention of pin to ground pin 2 to signal hot and pin 3 to signal return signal ground When connecting to Diagram 4 balanced cable equipment with XLR balanced inputs the connectors should 3 Pin Male XLR 3 Pin Female XLR Connector be wired pin for pin i e to 1 2 to 2 and 3 to 3 Diagram 3 Twe Core Screened Cable c onnector illustrates the XLR output pin arrangement Diagram 4 illustrates the cable arrangement for connection to balanced inputs Cables up to 50 metres in length may be connected to the main To Preamp Output To Power Amp or stereo or sub outputs i P Monitor Input 1 4 Operation Once connected to mains power and powered up from the rear panel mains switch the front panel Standby button or remote handset Standby button will switch the CA2 between standby and
11. The information in the following Sections GI to G5 is common to all ATC electronics products We recommend that you read this page and the safety warnings that proceed it before continuing to read the pages dedicated to your specific ATC products GI Installation ATC Equipment has been designed to be free standing either within an equipment stand or simply on a convenient item of furniture There are no special ventilation requirements but please see notes onAmplifiers below It is recommended that at least 100mm 4 inches clearance be left behind a unit for plugs and cables ATC Equipment has been designed to remain powered up in Standby mode unless it is to be unused for a long period of time Power dissipation will make the unit warm to the touch in either standby or operational mode Temperature stability will be reached after approximately three hours from mains switch on Full Audio performance is available immediately ATC Preamplifiers should be located as close to the source components as practically possible to minimise the cable length The Outputs however are capable of driving up to 50 metres of good quality cable therefore it is practical to locate the Preamplifier a distance away from the monitor or Power Amplifier s ATC Power Amplifiers should ideally be located to minimise the cable lengths from both the source components and the Loudspeakers Use of loudspeaker cables in excess of 20 metres should
12. User Manual CA2 Preamplifier SCA2 Preamplifier PI Power Amplifier P2 Power Amplifier SIA2 150 Integrated Amplifier SPA2 150 Power Amplifier a n D ACOUSTICENGINEERS Safety Warnings 12 Read instructions all the safety and operating instructions should be read before the appliance is operated Retain these instructions the safety and operating instructions should be retained for future reference Heed warnings all warnings on the appliance and in the operating instructions should be adhered to Follow instructions all operating and other instructions should be followed 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 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 Heat the appliance should be situated away from heat sources such as radiators stoves or other appliances that produce heat Power sources the appliance should be connected to a power supply only of the type described in the operating instructions or as m
13. annel are shown Settings for one channel should be duplicated on the other The cartridge gain and matching options should be used as described below Diagram SCA2 rear panel and connection sockets NO USER SERVICEABLE PARTS INSIDE Designed and manufactured by Acoustic Transducer Company o ground 3pinXLR WARNING Check AC voltage selection d SUS Gloucestershire GLG BHR England eTA A OY 2 0 0 0 00 00 OOe6 O 0 00 OO L balanced output R uals L balanced input R L balanced input R input input Input input input output input output cd aux 1 aux2 tuner tviav cd tape 2 tape 1 Table A Input Sockets Input socket types and legends Rear Panel Front Panel Input Notes Legend Legend Type balanced input cd cd bal XLR balanced x 2 balanced input aux aux XLR balanced x 2 input aux 2 aux 2 RCA phonox2 Marked phono on rear if SPH2 RIAA board fitted input tuner tuner RCA phono x 2 input tv av alv RCA phono x 2 input cd cd RCA phono x 2 input tape 2 tape 2 RCA phonox2 Part of record listen set input tape tape RCA phonox2 Part of record listen set Diagram 2 SPH2 Board and Link Locations C Capacitor bank See Diagram 3 Resistor bank See Diagram 3 Zi Z2 Z3 m X X ME Y Y Diagram 3 SPH2 Load Capacitor and Resistor Options Link ac
14. arked on the appliance 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 Cleaning the appliance should be cleaned only as recommended by the manufacturer Unattended periods the power cord of the appliance should be unplugged from the outlet when left unused for a long period of time Object and liquid entry care should be taken so that objects and liquids do not fall into the appliance 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 14 I5 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 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 Grounding or polarisation precautions should be taken so that grounding or polarisation means for the appliance are not defeated Contents Section GI Section G2 Sect
15. ating 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 Generic Information
16. ation 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 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 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 devast
17. be avoided if possible to prevent a possible degradation in sound quality Care must be taken to ensure that ventilation holes in the top and bottom covers are not obscured Please contact ATC if the Amplifier is to be mounted in an enclosed area G2 Mains Connection The CA2 and SCA2 Preamplifiers can be used with mains voltages from 100V to 240V 50 60Hz Please ensure that the local mains voltage matches that uppermost on the rear panel voltage selector plate before applying mains power to the unit The mains voltage selection can be adjusted by lifting the selector plate marked with four legends 100 120 220 230 with a small screwdriver and re inserting the plate with the correct voltage uppermost The SIA2 150 and SPA2 150 Power Amplifiers can be used with mains voltages from 100V to 240V 50 60Hz The PI Power Amplifier can be used with mains voltages from 100V to 240V 50 60Hz Mains voltage is factory set and should only be adjusted by ATC or your local dealer or distributor Please ensure that the local mains voltage matches that specified on the rear panel before applying power to the SIA2 150 SPA2 150 or PI Amplifiers The mains cable has been specifically supplied to comply with local statutory safety approvals and alternatives should not be substituted If you Intend to use your unit in an alternative territory please contact ATC for advise ATC equipment MUST be earthed Do not remove the earth wir
18. ced 20k Ohms XLR Balanced 2k7 Ohms per leg Output Impedance 10 Ohms Frequency Response 3dB DC 500kHz Total Harmonic Distortion 0 0005 106dB IV into 600 Ohms Crosstalk 10Hz 20kHz gt 90dB S N N Ratio gt 95dB Wide band gt 104dB DIN gt 108dB IEC A Residual noise gt 116dB IEC A Absolute phase Phono Unbalanced Zero Degress XLR Balanced Zero Degrees Pin 2 Hot XLR CMRR 100Hz 10kHz gt 90dB Power Requirements 100V 120 220 230V 50 60Hz Power Consumption 35VA maximum Dimensions including terminals H100 x W440 x D360mm H3 9 x WI7 3 x D14 2 inches Weight 9 5kg 20 91b Net 1 1 0kg 24 2Ib Packed E amp O E The policy of Loudspeaker Technology Ltd is that of continuous design and development We reserve the right to change specifications without prior notice PI amp P2 Power Amplifiers 3 1 Description The P Series stereo power amps are a range of high quality power amplifiers designed to partner ATC passive monitors and other loudspeaker systems The range consists of PI PI Pro P2 and P2 Pro The Pro versions differ by featuring 19 rack mount chassis front panel mounted standby button and remote standby trigger via a rear panel mounted connector The amplifiers incorporate the same gain reduction and loudspeaker protection circuits as used in the ATC active monitors This e
19. dspeaker output connections are made through two pairs of WBT connectors The SPA2 150 can be switched into and out of Standby mode by either ATC remote handset and incorporate comprehensive performance monitoring and feedback through a front panel display 5 2 Inputs The SPA2 150 is fitted with both unbalanced RCA Phono and balanced XLR inputs A switch on the rear panel selects between the two Note Do not attempt to connect both balanced and unbalanced inputs at the same time The selector switch is not a toggle between the two inputs The XLR and RCA input connectors are wired in parallel and the switch merely arranges for either balanced or unbalanced input The signal is present on the centre conductor of an unbalanced RCA Phono style input and the signal return is made via the screened outer If there is any hum present on the inputs this must be traced to its source and not suppressed by the removal of screens or earths Removal of the screen on an unbalanced input is likely to result in uncontrollably loud hum All signal cables and plugs should be of a good quality Poor cable and plug quality will compromise the performance of your system The signal input pin configuration for XLR sockets is illustrated in Diagram 2 while Diagram 3 illustrates a balanced cable Diagram I SPA2 150 rear panel and connection sockets right output MAINS INPUT 50 60H2z max power consumption 600VA CAUTION
20. e by pressing the desired monitor or record button The SCA2 front panel source indicators will illuminate but the rotary controls will not rotate Volume is controlled through the handset Level and buttons The SCA2 front panel Level control will rotate in response to handset level commands The handset Attn button is equivalent to the front panel Gain function The handset Mute function operates in exactly the same way as the front panel control The red indicator on the handset will flash as functions are operated Failure of this indicator points to exhaustion of the handset battery The battery should be replaced and the old battery disposed of by your local dealer or distributor The CA2 SIA2 150 and PI are supplied with the SCAR B remote handset This provides for remote operation of all functions of the units and includes a standard set of CD Player commands that may be used to control any CD or DVD SACD player that supports the RC5 control set Power is supplied by 4 X AAA batteries included ATC remote handsets may be used with the SPA2 150 to provide remote operation of the standby function Reliable operation of the remote handsets require direct line of sight between the handset and the unit front panel Correct operation of the handset on the SCA2 is indicated by illumination of a red indicator on the left hand side of the front panel as handset commands are received G5 Care and Maintenance ATC use high t
21. e in the mains plug G3 Fuses Mains power supply fuses are fitted within the CA2 and SCA2 but they are not intended to be user replaceable The mains power supply fuse for the SIA2 150 SPA2 150 and PI Amplifiers is located on the rear panel Should the Amplifier fail to switch on when the power switch is operated the fuse should be inspected PLEASE ENSURE THAT THE UNIT IS DISCONNECTED FROM THE MAINS SUPPLY BEFORE INSPECTING OR REPLACING A FUSE Lift out the fuse holder cover using a small screwdriver remove the fuse and inspect it for damage Fuses most often fail due to a serious electrical fault Only replace fuses with the same type as that suspected to be blown All fuses are 20mm Type T anti surge The fuse rating is printed on the rear panel adjacent to the fuse If a replacement fuse also fails then the Amplifier should be returned to ATC for service G4 ATC Remote Handsets The SCA2 is supplied with an SCA R remote handset Provided that the SCA2 is connected to the mains power and its rear panel power switch is on the SCA R provides for remote operation of all the SCA2 functions The SCA R also includes a standard set of CD Player commands which may be used to control any CD or DVD SACD Player that supports the standard RC5 control code set Use the handset On Reset button to switch the SCA2 into active mode and the Standby button to return the SCA2 to Standby mode Monitor and Record selection can be mad
22. echnology material finishes in all of their 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 is all that is required to keep the finishes clean Heavy soiling can be cleaned using a slightly moistened cloth with a non abrasive household cleaner G6 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 your 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 WWW www atc gb net Preamplifier l l Description The CA2 preamplifier has been designed to partner ATC active and with an appropriate power amplifier passive loudspeaker systems It incorporates 4 line level stereo inputs a high sensitivity phono amplifier input and a tape monitor input on RCA phono sockets One stereo record output a main stereo output and a sub output on RCA phono sockets together with a main stereo
23. emoved the load is 47kilohms Jumpers J3 J6 J and J4 set the gain sensitivity of the phono input J3 and J6 have two positions A and B In position A the gain of the phono stage is reduced in position B the gain is increased J and J4 can have the jumper fitted or removed When fitted the gain of the circuit is increased By setting combinations of these 4 jumpers a range of sensitivities can be accommodated or example for a cartridge with a low sensitivity J3 and J6 would be set in position B while JI and J4 would both have their jumper fitted Table A Diagram 2 RIAA Phono Board and Jumpers illustrates the input sensitivity and load characteristics available The manufacturer of the cartridge in use will be able to recommend the 7 O O appropriate settings O z mO aE OO i l ar A ii A PosB J4 J6 Pos B Table A RIAA Jumper Settings Jumper settings for Volt Output J2 B J5 Sensitivity Jl and J4 J2 and J5 J3 and J6 10 0mV Removed Fitted 100 Position A 6 7mV Removed Removed 47kQ Position A 5 1mV Removed Fitted 100 Position B 3 4mV Removed Removed 47kQ Position B 2 2mV Fitted Fitted 100 Position A 4mV Fitted
24. fier CD or preamplifier controls for example At all times during the operation of the SPA2 150 its internal microcomputer will monitor the important aspects of amplifier operation The front panel LED displays will warn of overdrive and fault conditions on either or both channels The unit will shut down if excessive temperature or DC offset faults arise but as the amplifier is designed to accommodate overdriving abuse indefinitely they will keep running Sound quality will however be impaired by the operation of the protection circuitry There is also the possibility of damage to the loudspeakers when driven at such high levels It is therefore prudent to reduce the system volume level to below the overdrive indication threshold The display and its interpretation is illustrated in Diagram 4 Excessive temperature and DC offset are both potentially very damaging and the amplifier will shutdown whilst displaying the fault condition that caused the problem Excessive temperature is only likely if the output load is too great or if the ventilation is inadequate The amplifier will not reset until the operating temperature has had time to return to normal DC offsets generally indicate a faulty source or preamplifier The power amplifier will not reset until the fault has been cleared Due to the nature of the electronics in ATC amplifiers it is quite normal for a sound to be heard from the speaker when the power is applied or disc
25. gger input is via a lockable 5 5mm jack plug and accepts 5 12V ac dc Standby can also be triggered via IR remote although a handset is not supplied Due to the nature of the electronics in ATC amplifiers 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 and is quite normal Although ATC uses the highest grade components a different noise may be heard from each speaker due to slight tolerance variations in the amplifier components PI PI Pro P2 P2 Pro Power Output gt 150W into 8 Ohms gt 250W into 8 Ohms 1 Distortion IkHz Both gt 200W into 4 Ohms gt 370W into 3 Ohms channels driven Continuous average Frequency Response lt 2Hz gt 400kHz 3dB Distortion lt 0 003 95dB IkHz 8 Ohms dB below full power Input Sensitivity 2 0V 3dBV 4 dBu 150 Watts 8 Ohms I kHz Input Impedance 10k Ohms Phono 10k Ohms Leg XLR S N N Ratio gt 100dB Wideband gt 110dB DIN gt 115dB IEC A Crosstalk gt 100dB 10Hz 20kHz Damping Factor gt 400 8 Ohms Absolute Phase Zero Degrees Phono Zero Degrees XLR Pin 2 Hot XLR Common Mode Ratio gt 60dB 100Hz 10kHz Power Requirements 100 115 230V factory set 50 60Hz Power Consumption 2VA Standby 3VA Standby 600VA Maximum 1000VA Maximum Remote Standby Trigger Input None 5 12v ac dc None 5 12v ac dc Dimen
26. gnal ground When connecting to equipment with XLR balanced inputs the connectors should be wired pin for pin ie to 1 2 to 2 and 3 to 3 Diagram 4 illustrates the XLR output pin arrangement and Diagram 5 the connection scheme for a balanced XLR XLR cable The unbalanced main left and right outputs and the tape record outputs should be connected using good quality RCA phono terminated leads Use of the front panel volume mute or gain functions does not effect the tape record signal Cables up to 50 metres in length may be connected to the main outputs Tape record cables should be limited to 10 metres Diagram 4 balanced output socket pins Pin 2 Signal hot Two Core Screened Cable Pin 3 Signal return Diagram 5 balanced cable pin connections 3 Pin Female XLR Connector To Power Amp or Monitor Input 10 Preamplifier Diagram 6 SCA2 front panel and controls monitor 2 4 Operation Once connected to mains power and powered up from the rear panel mains switch the front panel Standby Reset button or remote handset Standby button will switch the SCA2 between standby and active modes In standby mode the Standby Reset indicator will illuminate Operating the Standby Reset function will switch the SCA2 into active mute mode The Standby Reset indicator will extinguish and the Mute indicator will illuminate The Mute function automatically engages when the SC
27. ill illuminate to indicate selection The control has continuous movement When it is moved to the last input further rotation will select the first input The source selected is made available at the tape output sockets and is fully buffered to prevent signal interaction The Level Gain and Mute functions have no effect on the record output signals Tape copying can be performed by selecting Tape on the Record control to copy from Tape to Tape 2 In this case no signal will be routed to the Tape output sockets Copying from Tape 2 to Tape can be achieved in a similar manner Selecting Tape on the Monitor control while also recording to Tape i e tape is also selected on the record control enables the off tape signal from a three head tape machine to be monitored The Tape 2 circuit works in an identical manner Due to the nature of the electronics in ATC amplifiers 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 and is quite normal Although ATC uses the highest grade components a different noise may be heard from each speaker due to slight tolerance variations in the amplifier components Preamplifier 2 5 Specifications MAIN OUTPUTS Maximum Output Level 8 5V RMS into 600 Ohms balanced 17 5V RMS into 600 Ohms unbalanced Input Sensitivity for IV Output 230mV Input Impedance Phono Unbalan
28. int on the front panel beside the volume control This is the volume position the preamp should be set to for Home Cinema Bypass so the CA2 has no influence on signal level when used within a cinema surround system Due to the nature of the electronics in ATC amplifiers 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 and is quite normal Although ATC uses the highest grade components a different noise may be heard from each speaker due to slight tolerance variations in the amplifier components 1 5 Specifications Maximum Output Level 7 5V RMS into 600 Ohms Line Input Sensitivity for IV Output 150mV R LA A Input sensitivity See Table A R 1LA A Input Impedance See Table A R LA A Accuracy 20Hz 20kHz 0 5dB Input Impedance 5k Ohms Output Impedance 10 Ohms Frequency Response 3dB DC gt 500kHz Total Harmonic Distortion lt 0 0005 106dB IV into 600 Ohms Crosstalk 10Hz 20kHz gt 90dB S N N Ratio gt 95dB Wide band gt 104dB DIN gt 108dB IEC A Power Requirements 100 115 230V 50 60Hz Power Consumption 35VA Maximum Dimensions including terminals H90 x W445 x D330mm H3 54 x W17 5 x D13 0 inches Weight 7kg 15 4Ib Net 8kg 17 6lb Packed E amp O E The policy of Loudspeaker Technology Ltd is that of cont
29. inuous design and development We reserve the right to change specifications without prior notice Preamplifier 2 1 Description The SCA2 is an extremely high resolution preamplifier designed to partner ATC active and with an appropriate power amplifier passive loudspeaker systems It incorporates eight line level stereo inputs two stereo signal outputs and two stereo record outputs Two of the line inputs are balanced format on XLR sockets while the remaining inputs are unbalanced and on pairs of RCA phono sockets The main stereo output is balanced format on a pair of XLR sockets while the auxiliary stereo output is unbalanced and on a pair of RCA phono sockets The two record outputs are unbalanced on pairs of RCA phono sockets The AUX 2 line level input may be converted to function as a high sensitivity phono input through the addition of a factory fitted optional RIAA Phono Board The RIAA board carries an array of slide switches that enable optimal matching with phono cartridges of various output voltages and loading requirements Selection of SCA2 inputs is achieved via a eight position rotary control using gold plated relays for silent switching The SCA2 incorporates an independent record output signal path so enabling simultaneous listening and recording of different source signals Selection of the record output signal is achieved via a second eight position rotary control using gold plated relays for silent switching
30. ion G3 Section G4 Section G5 Section G6 Section 1 1 Section 1 2 Section 1 4 Section 1 5 Section 2 1 Section 2 2 Section 2 3 Section 2 5 Section 3 1 Section 3 3 Section 3 4 Section 3 5 Section 4 1 Section 4 2 Section 4 3 Section 4 4 Section 3 5 Section 5 1 Section 5 2 Section 5 3 Section 5 4 Section 5 5 Section 5 6 Introduction Installation Mains Connection Fuses ATC Remote Handset Care and Maintenance Warranty and Contact Description Inputs Section 1 3 Outputs Operation Specifications Description Inputs Outputs Section 2 4 Operation Specifications Description Section 3 2 Inputs Outputs Operation Specification Description Inputs Outputs Operation Specification Description Inputs Signal Cable Options Outputs Operation Specifications 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 install
31. ith a Monitor option selected by a single push button on the front panel The tape output will have the same signal as selected by the rotary input select control Operation of the Standby or tape monitor controls will not affect this output providing mains power is maintained A pair of phono sockets on the rear panel can be used to drive another amplifier A further pair of phono sockets can be used to drive a Sub channel Amplifier A Headphone output is provided via a 4 Jack socket to drive a variety of popular headphones When headphones are connected the signal to the speakers sub and pre out is muted Output level is controlled by the rotary Volume control on the front of the unit the position of which is indicated by a black pointer Rotating the control clockwise will increase the output level It is good practice to lower the volume setting before switching on the preamplifier or any associated equipment or while changing the input selection Due to the nature of the electronics in ATC amplifiers 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 and is quite normal Although ATC uses the highest grade components a different noise may be heard from each speaker due to slight tolerance variations in the amplifier components Specifications 4 5 Specifications Power Output 1 Distortion I kHz Both channels
32. lifier To Source Output Input With the power switch on the front panel Standby indicator P will illuminate The unit will then respond to control either from the front panel or the SPA2 150 an ATC remote handset Diagram 4 unbalanced cable The Standby button on the front panel will switch the SPA2 3 Pin Male XLR Phono RCA Connector 150 between active and standby modes The rear panel power Two Core Screened Cable Connector switch should be used to isolate the amplifier from the mains supply if it is to be unused for any significant period To Power Amplifier To Source Output Input 20 Power Amplifier When switched into active mode the unit will go into an initialisation sequence under the control of the internal microprocessor The standby indicator will extinguish and be replaced by the LED display displaying followed by a flashing decimal point At this time it is quite possible that the loudspeakers will emit a mild thump as the amplifier powers up and the initialisation routine is carried out When after a few seconds the initialisation is complete the figure J is replaced by a constantly lit decimal point The unit is now in the normal active mode The initialisation sequence is illustrated in Diagram 5 An indicator adjacent to the left of the Standby button illuminates when the amplifier receives remote control signals It will also illuminate if the signals received are not intended for the ampli
33. ls The left and right channels are clearly marked and correspond to the left and right inputs The positive terminal is marked red and the negative terminal is marked black Diagram 3 P2 rear panel and connection sockets serial no P2 High Performance Dual Mono Stereo Power Amplifier Designed and manufactured by Acoustic Transducer Company Gloucestershire GL6 8HR England serial no P2 Pro High Performance Dual Mono Designed and manufactured by Acoustic Transducer Company Gloucestershire GL6 8HR England Stereo Power Amplifier output ir disable O Do 6 cE output NO USER SERVICEABLE PARTS INSIDE x RETURN TO MANUFACTURER FOR DISPOSAL CHECK VOLTAGE BEFORE USE MAINS INPUT 50 60Hz Aw POWER CONSUMPTION 800VA MAX output ir disable Gl La 0 CHECK VOLTAGE BEFORE USE zaov TeA ney T1288 MAINS INPUT 50 60Hz Aw ea POWER CONSUMPTION B00VA MAX 3 4 Operation PI Hi Fi Model The amplifier can be brought out of Standby by pressing the Standby push button on the remote control A further press of the button will put the amplifier back into standby A push button on the rear panel marked ir disable defines how the PI will operate once connected to mains power and powered up from the rear panel mains push button P2 Hi Fi Model Operation is
34. nsures that even working at very high levels the amplifier is held back from clipping so improving the subjective performance and protecting the loudspeakers from damage All the amplifiers in the series are of a true Dual Mono design in that the power supplies signal and return paths are totally separated from each other This approach ensures that the Amplifier will achieve the maximum signal separation and minimum crosstalk Further Intermodulation between channels via the power supplies is reduced to an absolute minimum at all frequencies and the power delivery from one channel cannot affect the specified power available from the other channel The amplifier mains power is turned on by a push button on the rear panel There is a Green L E D on the front panel to indicate that the mains supply is connected together with a Red L E D to indicate that the Amplifier is in Standby The Amplifier can be brought out of Standby by the Standby button on the ATC SCA R remote control supplied with PI and P2 On the rear panel is a push button to defeat remote control operation in which case when the Amplifier is switched on the unit will not be in Standby The Red L E D will be off and the Remote control has no effect The PI Pro and P2 Pro amplifiers can be bought out of standby using the front panel mounted button No IR remote is supplied with the Pro versions of the amplifiers and they do not feature IR defeat on the rear
35. onnected The noise heard will not damage the speaker and is quite normal Although ATC uses the highest grade components a different noise may be heard from each speaker due to slight tolarance variations in the amplifier components Diagram 5 Display legends Initialisation The decimal point flashes to show initialisation is in progress Normal Operation The decimal point illuminates to show the amplifier is powered up and is healthy Over Temperature Indicates that the temperature is over 90 C in the left amplifier channel This condition will shut down the amplifier Pressing the Standby button will restore the amplifier to normal only if the temperature has dropped significantly Over Temperature Indicates that the temperature is over 90 C in the right amplifier channel This condition will shut down the amplifier Pressing the Standby button will restore the amplifier to normal only if the temperature has dropped significantly Over Temperature Indicates that the temperature is over 90 C in both amplifier channels This condition will shut down the amplifier Pressing the Standby button will restore the amplifier to normal only if the temperature has dropped significantly DC Offset Indicates a DC voltage of greater than IV present on the output of the left amplifier This condition will shut down the amplifier Pressing the Standby button will restore the amplifier to no
36. output on XLR sockets and a headphone output on a 4 jack socket The phono amplifier stage carries an array of slide switches that enable optimal matching to phono cartridges of various output voltages and load requirements Selection of CA2 inputs is achieved via a five position rotary control using gold plated relays for silent switching Output volume adjustment is achieved through a precision motorized potentiometer The tape monitor function can be selected from a front panel push button The tape output is a duplicate of the source selected by the input selector Standby is also accessible from a front panel push button Mains power is applied from a rear panel mounted switch All CA2 functions are duplicated on the ATC SCAR B remote handset 1 2 Inputs The CA2 accepts unbalanced RCA phono style input plugs The signal is present on the centre conductor of an unbalanced input and the signal return is made via the screened outer If there is any hum present on the output this must be traced to its source and not suppressed by the removal of screens and earths Removal of the screen on an unbalanced input will result in uncontrollably loud hum The input sockets are illustrated in Diagram Inputs labeled CD TUNER AV and AUXI are at line sensitivity and are electrically identical A line level signal from any source equipment may be connected to any of these inputs The right hand viewed from the rear pair of AUX2 PH
37. panel They do feature remote triggering of standby via a rear panel mounted 5 2v ac dc input Diagram PI rear panel and connection sockets serial no C P1 High Performance Dual Mono Stereo Power Amplifier Designed and manufactured by Acoustic Transducer Company Gloucestershire GL6 8HR England ir disable O la oO ce NO USER SERVICEABLE PARTS INSIDE RETURN TO MANUFACTURER FORDISPOSAL A link out DE MAINS INPUT 50 60Hz Aw Dla POWER CONSUMPTION 600VA MAX serial no P1 Pro High Performance Dual Mono Stereo Power Amplifier output OO Designed and manufactured by Acoustic Transducer Company Gloucestershire GL6 8HR England external trigger ir disable O I Oa 0 output NO USER SERVICEASLE PARTS INSIDE OO CHECK VOLTAGE BEFORE USE power O Qo fuse MAINS INPUT 50 60Hz Aw POWER CONSUMPTION 600VA MAX Power Amplifiers PI amp P2 3 2 Inputs Single ended Inputs via RCA phono sockets and Differential balanced Inputs via XLR sockets are provided Each channel has two phono Input sockets the Link Input phono sockets may be used to connect the Amplifier Inputs to a further ATC Power Amplifier for Instance as a Sub Channel 3 3 Outputs Loudspeaker connections are made using the two pairs of proprietary ATC loudspeaker termina
38. rmal only if the fault has been cleared DC Offset Indicates a DC voltage of greater than IV present on the output of the right amplifier This condition will shut down the amplifier Pressing the Standby button will restore the amplifier to normal only if the fault has been cleared DC Offset Indicates a DC voltage of greater than IV present on the output of both amplifiers This condition will shut down the amplifier Pressing the Standby button will restore the amplifier to normal only if the fault has been cleared Overdrive Indicates that maximum drive has been reached on the left amplifier and that the gain reduction circuits are operating to prevent clipping Overdrive Indicates that maximum drive has been reached on the right amplifier and that the gain reduction circuits are operating to prevent clipping Overdrive Indicates that maximum drive has been reached on both amplifiers and that the gain reduction circuits are operating to prevent clipping Power Amplifier 5 6 Specifications Power Output 1 Distortion I kHz Both channels driven Continuous average gt 150 Watts Frequency Response 3dB lt 3Hz gt 400kHz Distortion IkHz 8 Ohms dB below full power lt 0 001 100dB Input Sensitivity 150 Watts 8 Ohms kHz 1 0V Input Impedance 10k Ohms Phono 10k Ohms Per leg XLR S N N Ratio gt 95dB Wide band gt 100dB
39. ross for 400 ohms Link across for 500 ohms Link across for 2200pF Link across for 300 ohms Link across for 1000pF Link across for 600 ohms Link across for 470pF Link across for 200 ohms Link across for 220pF Link across for 700 ohms Link across for 100pF Link across for 100 ohms Trim 50 ohms Preamplifier Table B RIAA Board Gain Stage Link Setting Mid point gain stage set LOW 1 I dB Link ZI to Z2 First gain stage settings Gain Setting Gain mV Gain dB Link Position High 1 14mV 59dB Link both Y Y and X X High mid 6mV 55dB Link Y Y only Mid 3 3mV 49dB Link X X only Low 33 0mV 30dB No links Mid point gain stage set HIGH 24dB Link Z2 to Z3 First gain stage settings Gain Setting Gain mV Gain dB Link Position High 0 25mV 71dB Link both Y Y and X X High mid 0 38mV 68dB Link Y Y only Mid 0 78mV 62dB Link X X only Low 7 5mV 42dB No links Gain Gain is set by fitting the Z link in one of two positions Z to Z2 or Z2 to Z3 and by setting a combination of X and Y links These links should be fitted according to the desired input sensitivities specified in Table B Capacitive Load Capacitive load is set by selecting a link for the appropriate capacitance value as illustrated in Diagram 3 Multiple links may be be used in which case the load value is the sum of the selected values For example links in the 470pF position and 1000pF position give a total load value of 1470pF
40. sions H x W x D 135 x 435 x 350mm 135 x 483 x 350mm 135 x 435 x 350mm 135 x 483 x 350mm 5 32 x 17 13 x 13 78 in 5 32 x 19 0 x 13 78 in 5 32 x 17 13 x 13 78 in 5 32 x 19 0 x 13 78 in Weight 23kg 50 6lbs Net 23 5kg 51 7lbs Net 25kg 55lbs Net 25 5kg 56 Ilbs Net 25kg 55lbs Packed 25 5kg 56 I lbs 27kg 59 4lbs 27 5kg 60 5lbs E amp O E The policy of Loudspeaker Technology Ltd is that of continuous design and development We reserve the right to change specifications without prior notice Integrated Amplifier 4 1 Description The SIA2 150 is a high quality integrated amplifier designed to partner ATC passive monitors and other Loudspeaker systems It incorporates five line level stereo inputs plus headphone jack stereo record pre and sub outputs on RCA phono sockets and one pair of loudspeaker outputs Input selection is achieved via a rotary control Output volume adjustment is achieved by a precision potentiometer A tape monitor function is a duplicate of the source selected by the input selector A standby function is also accessible from a front panel push button Mains power is applied from a rear panel mounted switch The SIA2 150 incorporates the same gain reduction and loudspeaker protection circuits as used in the ATC active monitors This ensures that even working at very high levels the amplifier is held back from clipping so improving the subjective performance and protecting the loudspeakers from damage All SIA2 150 f
41. sulation Diagram SIA2 150 rear panel and connectors serial no MAINS INPUT 50 60Hz A CHECK VOLTAGE BEFORE USE O SIA2 150 High Performance Stereo Integrated Amplifier headphones Designed and manufactured by Acoustic Transducer Company Gloucestershire GL6 8HR England cE NO USER SERVICEABLE PARTS INSIDE x RETURN TO MANUFACTURER FOR DISPOSAL A EE AE Acougtic Transducer Co is a trading name and QR isthe registered Trade Mark of Loudspeaker Technology Lid I5 Integrated Amplifier Diagram 2 SIA2 150 front panel and controls standby SIA2 150 Stereo Integrated Amplifier 4 4 Operation Once connected to mains power and powered up from the rear panel mains switch the front panel Standby button or remote handset Standby button will switch the CA2 between standby and active mode In Standby mode the Standby Indicator glows RED Operating the Standby function from either the front panel or the remote handset will switch the CA2 into active mode The RED indicator will extinguish and be replaced by the Input select indicator showing the current selection in GREEN Operating the Standby function again will return the CA2 to Standby mode Inputs are selected by rotating the input select control in either direction The control has continuous movement When it is moved to the last input further rotation will select the first input A separate tape loop is included w
42. the rear panels The left and right channels are clearly marked The loudspeaker terminals are labelled positive and negative The wire used for the connections to the monitors will have some identification for the positive conductor Usually this is red but may be a moulded stripe on the insulation The terminals will accept either bare wire up to 5 7mm diameter or 4mm male plugs When bare wire connections are made the insulation should be carefully removed to expose 12mm of conductor The conductors should be tightly twisted together and inserted into the connector ensuring that no r Diagram 2 input connection pins stray strands of wire cause a short circuit It is important that both loudspeakers are connected with the same polarity That is both positive loudspeaker terminals are Pin ground Pin 2 Signal hot connected back to positive amplifier terminals and both Pin 3 Signal return negative loudspeaker terminals connected back to negative amplifier terminals The SPA2 150 is suitable for loudspeaker systems with a Diagram 3 balanced cable nominal impedance of 4 Ohms or greater 3 Pin Male XLR 3 Pin Female XLR 5 5 O pe ration Connector Two Core Screened Cable Connector Once connected to mains power and switched on from the rear panel mains switch the front panel Standby button or ATC remote handset Standby button will switch the SPA2 150 between standby and active modes To Power Amp
43. unctions are duplicated on the included ATC SCAR B remote control handset 4 2 Inputs The SIA2 150 accepts unbalanced RCA phono input plugs The signal is present on the centre conductor of an unbalanced input and the signal return is made via the screened outer If there is any hum present on the inputs this must be traced to its source and not suppressed by the removal of screens or earths Removal of the screen on an unbalanced input is likely to result in uncontrollably loud hum The input sockets are illustrated in diagram All inputs are line level sensitivity via RCA phono connectors on the rear panel Inputs are labeled CD Tuner AV Aux and Tape in However they are electrically identical and a line level signal from any source equipment may be connected to any input 4 3 Outputs The SIA2 150 rear panel illustrated in diagram carries connectors for left and right loudspeakers Tape left and right outputs Preamplifier left and right outputs and a left and right summed mono output Loudspeaker connections are made using the two pairs of proprietary ATC loudspeaker terminals The positive terminal is coloured red and the negative terminal is coloured black The left and right channels are clearly marked and correspond to the left and right inputs The wire used for the connections to the monitors will have some identification for the positive conductor Usually this is red but may be a moulded stripe on the in
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