User Manual Active SCMSOASLmiddot SCM IOOASL bull SCM ISOASL Passive SCMSOSL bull SCM IOOSL bull SCM ISOSL

MULTI C H ANNE L

ACOUSTIC ENGINEER

Safety Warnil gs

I RCi1din~truttiuU-illllh te$J( [(UIlJOp r1dll lit Uu lifI~h UHj~ bullbullmiddot11

1gtltgt(0 the pploc is op~rated

1 Rttaln thlse if s-trucrlonJ-ch Sll ly ar1 up tI(lIIg UllttnJ(ioll huuld lu

fetainr-d r r luture r-rflrl(e

1 UilltJ warnings - 11 y IllIng II h jlstructl1n shoul t e uJh-r tJ

04 Follow Ilutru iOIl III opcltrln l 01 I in llu LI

foil rJ

W ter lrrI ItlCti lur lit opp I r

-mph ne middot a b thtub washt)

h I nl or np~r t1 winUlIIH I pour et

6 Vttntil2tiou - thr appIL1nc( ho Iltl U( II u~lrd ) [h1pound II II 10(111 n or

pOliti on does nut inu--1cl with III P opt r Ilmiddotntllu i)1l or t x trllph~middot tin

apph nee shoutd not be ilUU ~d un heJ sofa I ug Of in Ifll ~ J face th l

m I block t~ velicilAtlllll up run 50 SlIuill Iy tnt- appfi li)C II tId flot th

buil t Intu an In) lI-ti 1 uchn oJ bkcA (JI (lLi t lhr nl IfllptmiddotU

th~ flow of air thfOllph Ih v(lntll tlnl opL-mn t)

1 - t - th l april n e ihould h -situ(d tiIY fl(lIll ht t nlH( Jeh )

radiiltor bull ltolles or uUur applrJncl s that poducr hoC)[

8 Po ~r 5(lurc the apphJlur twuld bI

or the typ~ tJ~liCribtd In the operbullu Hlll mSl IJctl~HU 4) h rl1a k~d 011 the

llppli nee

9 Power enl d prot (tiOfI - po N~ UP ll Cltcb ihotJ ld b futmiddotd~ that til y

are not li k(ly to b~ w Ik~cI on or pinchlJ by tenl placed upon tHmiddot ~gail

them payln plrli ulr alt~lIrio tfJ cOld) iJl pljg~ ~1nvefH n~r

rec puc and th~ pOint wht~ Ihcy illh phIIICmiddot

10 C It ning - the appli 11( h)ul h It-III lIlyn COf I I d J It) tilmiddot

manu( ctUf r

ll Un ttomJed p nuf - III pow I C Id tilt 1ppli Ice hould hc

12 Obj middotct md IIqllld noy - Col

du not I II Into eh Ipplidll~

13 Danllgt rl-quir1l i rVI - tit bull ph ntlo 101111 hr- ~ r yt( cl If () 11f II

Urvic~ plt~Ii I wll n

il obj cu holt c i tIl deg11 nr IIqwd hu lJ n spill d into til PI I HI

iv the pplilnce doe nul dr-pear to ufHtrole nt1rn1lHy (H- t)tllllllt -Ill r I( d

chan e ~n p _ r(Of manu

v the appli flee has b ~ dropped or Ih cbinet d rnaged

14 Suvicing - tJu uSer ~hnurd not att(gtnlpt co f~rvlu~ du ppliilnce btmiddotY3nmiddotJ

those ta5urcos d4scrlbed irl tht operOltmg instrucliunsAtI other jervlcing

should hco r~f~rrcd tu qualified hmiddotrvic pcnonnel

I S Grounding or pololrisation _ prec1utions houl I h (lken secto tha[ grounding

or POlMi53tion mAdns for the ~ppli nc re nut d middotal~d

Safety Warnil gs

I RCi1din~truttiuU-illllh te$J( [(UIlJOp r1dll lit Uu lifI~h UHj~ bullbullmiddot11

1gtltgt(0 the pploc is op~rated

1 Rttaln thlse if s-trucrlonJ-ch Sll ly ar1 up tI(lIIg UllttnJ(ioll huuld lu

fetainr-d r r luture r-rflrl(e

1 UilltJ warnings - 11 y IllIng II h jlstructl1n shoul t e uJh-r tJ

04 Follow Ilutru iOIl III opcltrln l 01 I in llu LI

foil rJ

W ter lrrI ItlCti lur lit opp I r

-mph ne middot a b thtub washt)

h I nl or np~r t1 winUlIIH I pour et

6 Vttntil2tiou - thr appIL1nc( ho Iltl U( II u~lrd ) [h1pound II II 10(111 n or

pOliti on does nut inu--1cl with III P opt r Ilmiddotntllu i)1l or t x trllph~middot tin

apph nee shoutd not be ilUU ~d un heJ sofa I ug Of in Ifll ~ J face th l

m I block t~ velicilAtlllll up run 50 SlIuill Iy tnt- appfi li)C II tId flot th

buil t Intu an In) lI-ti 1 uchn oJ bkcA (JI (lLi t lhr nl IfllptmiddotU

th~ flow of air thfOllph Ih v(lntll tlnl opL-mn t)

1 - t - th l april n e ihould h -situ(d tiIY fl(lIll ht t nlH( Jeh )

radiiltor bull ltolles or uUur applrJncl s that poducr hoC)[

8 Po ~r 5(lurc the apphJlur twuld bI

or the typ~ tJ~liCribtd In the operbullu Hlll mSl IJctl~HU 4) h rl1a k~d 011 the

llppli nee

9 Power enl d prot (tiOfI - po N~ UP ll Cltcb ihotJ ld b futmiddotd~ that til y

are not li k(ly to b~ w Ik~cI on or pinchlJ by tenl placed upon tHmiddot ~gail

them payln plrli ulr alt~lIrio tfJ cOld) iJl pljg~ ~1nvefH n~r

rec puc and th~ pOint wht~ Ihcy illh phIIICmiddot

10 C It ning - the appli 11( h)ul h It-III lIlyn COf I I d J It) tilmiddot

manu( ctUf r

ll Un ttomJed p nuf - III pow I C Id tilt 1ppli Ice hould hc

12 Obj middotct md IIqllld noy - Col

du not I II Into eh Ipplidll~

13 Danllgt rl-quir1l i rVI - tit bull ph ntlo 101111 hr- ~ r yt( cl If () 11f II

Urvic~ plt~Ii I wll n

il obj cu holt c i tIl deg11 nr IIqwd hu lJ n spill d into til PI I HI

iv the pplilnce doe nul dr-pear to ufHtrole nt1rn1lHy (H- t)tllllllt -Ill r I( d

chan e ~n p _ r(Of manu

v the appli flee has b ~ dropped or Ih cbinet d rnaged

14 Suvicing - tJu uSer ~hnurd not att(gtnlpt co f~rvlu~ du ppliilnce btmiddotY3nmiddotJ

those ta5urcos d4scrlbed irl tht operOltmg instrucliunsAtI other jervlcing

should hco r~f~rrcd tu qualified hmiddotrvic pcnonnel

I S Grounding or pololrisation _ prec1utions houl I h (lken secto tha[ grounding

or POlMi53tion mAdns for the ~ppli nc re nut d middotal~d

SCM50100150

I I lOll

( I if In eI H lnt-Al yfU h ~ d uhn n

1111 of lb middot Itn( 1 tIdll b incLli lig

th II t 1 If ttlll1 middot I I

tld h~ i- n II I

oIU t bull I lttflt I bull tfutJfI I duo e 0 ullsci1H I t ~ k of thl

fI dtU

Contents

PoIgdl Introduction

PalleJ SCM5011001150ASL Secuon I Unplcking Clnd Handling

SectIon 1 Monitor PIJ((mem

Secuon J Conn~ctlo

P~g 4 Section 4 Signal DbIe Options

Section S Opcrttlon Section 6 listCOlllg

PKr 5 Section 7 COlre and MlIntCnUlce Scctlon 8 W3rllnty Jnd ConlolCt

SpcclficJtion5

SCM5011 OOll50SL PH 6 Section I Unplcklng Jnd Hmdlmg

Sec tlon 2 Monitor Pllccmtnt

Section l AmpllflcJtion

S~cllon -4 Connection

P~r 7 Seltuon 5 listenmg Section 6 Care ilnd Maintenance

Section 7 W~rrtnt) lnd COIltlct

PI)r 8 SPlOfl(dtiollS

ATC was funded 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 ATe 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 Its 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 (or extended

periods The only way to combine the two is through precision engineering of a class

and scale more often associated with aerospace or motorspon But the results are

worth the effort and the cost ATC loudspeakers with their unique in-house

designed dr ivers 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 the ir place and ATe engineering

skills can still bring rema rkable results from them active is a fundamentally better

solution to the problems posed by accurate high level music reproductio n 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 deman d multiple power

amplifiers so ATC from the mid 1980s became not just a loudspeaker manufacturing

company but an electronics manufacturer tooThe 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 love rs professional audio engineers studios and

musicians across theWorld that understand and value the engineering that goes into

an ATC product - and the sound that comes out

I Unp

The SCMSO

Always emp

la rge open

First lay

holding tI

on the fie

Lift the 0

Remove

The mon

the pack

2 Mon

Th e subjecti

infiuenced b)

and itS positi

rooms which

curtains and

frequencies

low frequen

minimise low

from comer

stands aroun

back If the b

the back wa

Paragraph S

inappropriate

experiment y

comprom ise

requirement

experienced

asymetric dri

driver and tw

fonn of cabir

must be pro

3 Coni

Two cable cc

for the audi

statutory saf

use your mOl

connection n

The signal c

XLR term in

your monito

2

I

Inst al lati o n SCMSOI 001 SOASL

I Unpacking and Handling

The SCM 50 100 and 150 are large heavy items and should be handled with care

Always employ a second person to assist in moving it Unpacking them requires a

tn who still

as naturally

vhere many

began their

simple one

tend to be

lal monitor

signed from

surprisingly

i-fi levels of

~ngineering

ore robust

r extended

ilg of a class

results are

Ie in-house

g ef(ec~

)ffer active

~ filt~rs and

accicude to

engineering

tally better

nTheATC

e[cer

ATC into

pie power

nufacturing

tronics for

al and now

CD player

very few

Iy selecting

tudios and

It goes into

large open space preferably near their final pos it ion

First lay the carton down and open the flaps on itS sideWhile

holding the flaps apart turn the carton over so the open side is

on the floor

Lift the ou ter carton of( the inner packing

Remove the end pad from the bottom of the monito r

The monitor can now be stood upright and the remainder of

the packaging removed

2 Monitor Placement

The subjective perfonnance of any monitor loudspeaker will be

innucnced by (he acoustic character of the room in which it is used

and its position within the room Most often moniwrs are installed in

rooms which are comfortab le (0 sit and talk in A mixture of carpets

currains and soft furnishings will help ensure that midd le and high

frequencies are reasonably well controlled There may however be

low frequency problems either toO much or tOO line bass To

minimi se low frequen cy problems the monitors should be kept away

from corners or walls Starr with them positioned on appropriate

srands around I 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 Use the Bass Boost control (SCM Pro only See

Paragraph 55) for fine tuning rather than to compensate for

inappropriate positioning 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 Monitors with an

aymetric driver array should be positioned such that the midrange

dnver and tweeter are in board If the monitors are co be placed in any

form of cabine~ adequate side and tOP clearance for cooling airflow

must be provided

J Connection

To Monitor Input

Two cable connections are required for each monitor one for mains power and one

for the audio signal The mains cable is speCifically supplied to comply with loca l

Statutory safety approvals and alterna tives should not be substituted If you intend to

use your monitors in an alternative territory please contanATC for advice The mains

connection must always be earthed

The signal cab le and plug (not necessarily supplied) should be of a good qua lity and

XLR terminated Poor cable and plug quality wi ll compromise the performance of

your monitors The Signal input pin configuration is illustrated in Diagram I

Diagram I inpul connection pillS

Pin 2 Signa l (hot) _ _ ___~ Pin I Screen

__ Pin ] Signal (return)

I gr 1 2middot d c1I I

] Pin Male XLR ] Pin Female X LR

Connector=a Co d C

To Monitor Input To Source OUtPUt

D i gram bull ubi need c bl

] Pin Ma le XLR Phono (RCA)Fa Co od c

To Source OUtput

3

II

SCM50100150ASL

4 S i gnal Cable Option s

Balanced ( able (ollfigUI allon is (he pr O(e(red

option however unbalanced cOllnection is pOi sible

Diagrams 2 and 3 illustrate [he signal ca ble

conneCtions required for each o ptto n Balanced

(XLR to XLR) co one tlon offe rs lower noise and

better immurlly to hum plCk-p U nbalanced

(XU to Phono or Two Pole Jack) ( n eClion

carTIes -isk of In calis d by mLiriple gnal euro Jrlhs

Hurn pi Dblerns re ulung frorr unbalanced

conneClion may be reduced b akng ONE of the

fo llowing modifications to Lh E signal cable

connections If the driving premplliler (or desk) is

double insula[ed (Ie has no mains earth)

disconnect thE sIgnal cab le scree ltI( ti le RCA Phone

plug end Alternatively disclnnet t the signal cable

screltn at (he X LR end nus seto rlcl option will Olakc

the source ( ~ refel Eme sIgnal eOir tho

S Operation

D lagl lttIll 4 il lu)CI lS d ie tOillK u middoto n ltiIJd ( l ilt I

panel Each fEalU e IS descCibed below

5 I Mains Inlet The pph~d Ill Fuwe r Ie

(appropriate to the lo cal territory) should e

connected he re Ensur e titat rhe 11In S oltage

specified on the panel corresponds w ith (he

loca l supply

52 Power Switch Switches on the mo 1(01 When

switched on the indicaror on the panel will

illuminate

53 Fuseholder Should a moniwl- fail to switch on

when the power switch is opera ted (he fuse

should be inspected Lift out the fuseholder

cover using a small flat-blade screwdriver

remove (he fuse and inspect it fo r damage If

required a ep lacement fuse should be fitted It

should be stressed however that fuses mo ~[

often fail only because of a ~erious e lecLrical

fault If this is the case then simply replacing the

fuse Will only result in another fuse fail c -e The

monitor should be returned to ATe if a second

fuse fails

54 Input SocketThe audo signal ca ble should be

connected here Balan ced or unbalanced cables

may be used (See Section 3)

55 Bau Boost (SCM Pro only) Provdes up to

6dB of gain in the -egion of 40Hz Use a small

flat blad ~HrewdrlLl ((I ac eS$ [he control Add s ID r C w rmth and energy to

the lowe r f(equenli~s in music at (he expense of accurate transiem

reproduct ion Note Adj us ting the bass boost without the ab ility to recal ibrate

may leave a pair of nlon ito rs unmatched

56 Level Trim (SCM Pro only) Provides access to an internal control that enables

adjustment o f input sensitivity Use a small flat blade screwdriver to access the

control As supplied mo nitors are calibrated to an input senSitivity o f IV

NotcAd justing th e s en ~i ti vi ty w ithout the ability to recalibrate will leave a pair

of monito rs unmatched

D ue to the rld ture of the e lect ro nICs in ATC active loud spea e rs it is quite normal

fol 0 sound to be heud from the speaker when the power is applied or

d ~sconnccted T he nOlsc hea rd will nor dam ge rhe ~peJker Zlnd is qUite normal

A lthogh ATC scs the higho-gnde components a differenl nOISe may be heard

from cach speJker due to ~ l lamph l to lu ancc variations m the amplifier components

LteI Tnm

(SCM P 0 on ly)

6 Listening

The ear and brilln tend to intc lpret distorted sound as loudness and thus

underestimate the actua l level of undisltorted sound The SCM SO 100 and I SO like

all ATe monitor S demol1scl ates very much lower levels of distortion than

convent iona l systems of 1 sim ilar size and it is therefo re advisable to begin lisLening

at an artificially low evel and G refully increase the volume It is also possible for the

SCM50 100 or 150 to produce su fficient sound pressure levels for you r ears

t hemselve s to become a source of distonion and make the sound appear harsh Any

aud ible distortion ind icates that either the system or your ears are being ove rlo aded

and that the volume level should be reduced

Ampll lUC

Cut-off F (-6d8 fre

Malch d

D hiprsio

Max Cun

Crossov~

Input Co

Inpul Slr

S~h~il

Illplll ln11

Arnplifit

Ov r103d

811 Boo

Cbln ltI

Overal l V

PoWr~ Rc

Stot nd5l8

Cabine-t I

~tgtOM

jut 5pMraili

-c rQampf

7 Ca

High ted

and with

use N o n

] Heavy so

househol

There an

or that v

kind of rc

There an

of any rr

consultar

of each p

4

Inst al lati o n SCMSOI 001 SOASL

I Unpacking and Handling

The SCM 50 100 and 150 are large heavy items and should be handled with care

Always employ a second person to assist in moving it Unpacking them requires a

tn who still

as naturally

vhere many

began their

simple one

tend to be

lal monitor

signed from

surprisingly

i-fi levels of

~ngineering

ore robust

r extended

ilg of a class

results are

Ie in-house

g ef(ec~

)ffer active

~ filt~rs and

accicude to

engineering

tally better

nTheATC

e[cer

ATC into

pie power

nufacturing

tronics for

al and now

CD player

very few

Iy selecting

tudios and

It goes into

large open space preferably near their final pos it ion

First lay the carton down and open the flaps on itS sideWhile

holding the flaps apart turn the carton over so the open side is

on the floor

Lift the ou ter carton of( the inner packing

Remove the end pad from the bottom of the monito r

The monitor can now be stood upright and the remainder of

the packaging removed

2 Monitor Placement

The subjective perfonnance of any monitor loudspeaker will be

innucnced by (he acoustic character of the room in which it is used

and its position within the room Most often moniwrs are installed in

rooms which are comfortab le (0 sit and talk in A mixture of carpets

currains and soft furnishings will help ensure that midd le and high

frequencies are reasonably well controlled There may however be

low frequency problems either toO much or tOO line bass To

minimi se low frequen cy problems the monitors should be kept away

from corners or walls Starr with them positioned on appropriate

srands around I 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 Use the Bass Boost control (SCM Pro only See

Paragraph 55) for fine tuning rather than to compensate for

inappropriate positioning 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 Monitors with an

aymetric driver array should be positioned such that the midrange

dnver and tweeter are in board If the monitors are co be placed in any

form of cabine~ adequate side and tOP clearance for cooling airflow

must be provided

J Connection

To Monitor Input

Two cable connections are required for each monitor one for mains power and one

for the audio signal The mains cable is speCifically supplied to comply with loca l

Statutory safety approvals and alterna tives should not be substituted If you intend to

use your monitors in an alternative territory please contanATC for advice The mains

connection must always be earthed

The signal cab le and plug (not necessarily supplied) should be of a good qua lity and

XLR terminated Poor cable and plug quality wi ll compromise the performance of

your monitors The Signal input pin configuration is illustrated in Diagram I

Diagram I inpul connection pillS

Pin 2 Signa l (hot) _ _ ___~ Pin I Screen

__ Pin ] Signal (return)

I gr 1 2middot d c1I I

] Pin Male XLR ] Pin Female X LR

Connector=a Co d C

To Monitor Input To Source OUtPUt

D i gram bull ubi need c bl

] Pin Ma le XLR Phono (RCA)Fa Co od c

To Source OUtput

3

II

SCM50100150ASL

4 S i gnal Cable Option s

Balanced ( able (ollfigUI allon is (he pr O(e(red

option however unbalanced cOllnection is pOi sible

Diagrams 2 and 3 illustrate [he signal ca ble

conneCtions required for each o ptto n Balanced

(XLR to XLR) co one tlon offe rs lower noise and

better immurlly to hum plCk-p U nbalanced

(XU to Phono or Two Pole Jack) ( n eClion

carTIes -isk of In calis d by mLiriple gnal euro Jrlhs

Hurn pi Dblerns re ulung frorr unbalanced

conneClion may be reduced b akng ONE of the

fo llowing modifications to Lh E signal cable

connections If the driving premplliler (or desk) is

double insula[ed (Ie has no mains earth)

disconnect thE sIgnal cab le scree ltI( ti le RCA Phone

plug end Alternatively disclnnet t the signal cable

screltn at (he X LR end nus seto rlcl option will Olakc

the source ( ~ refel Eme sIgnal eOir tho

S Operation

D lagl lttIll 4 il lu)CI lS d ie tOillK u middoto n ltiIJd ( l ilt I

panel Each fEalU e IS descCibed below

5 I Mains Inlet The pph~d Ill Fuwe r Ie

(appropriate to the lo cal territory) should e

connected he re Ensur e titat rhe 11In S oltage

specified on the panel corresponds w ith (he

loca l supply

52 Power Switch Switches on the mo 1(01 When

switched on the indicaror on the panel will

illuminate

53 Fuseholder Should a moniwl- fail to switch on

when the power switch is opera ted (he fuse

should be inspected Lift out the fuseholder

cover using a small flat-blade screwdriver

remove (he fuse and inspect it fo r damage If

required a ep lacement fuse should be fitted It

should be stressed however that fuses mo ~[

often fail only because of a ~erious e lecLrical

fault If this is the case then simply replacing the

fuse Will only result in another fuse fail c -e The

monitor should be returned to ATe if a second

fuse fails

54 Input SocketThe audo signal ca ble should be

connected here Balan ced or unbalanced cables

may be used (See Section 3)

55 Bau Boost (SCM Pro only) Provdes up to

6dB of gain in the -egion of 40Hz Use a small

flat blad ~HrewdrlLl ((I ac eS$ [he control Add s ID r C w rmth and energy to

the lowe r f(equenli~s in music at (he expense of accurate transiem

reproduct ion Note Adj us ting the bass boost without the ab ility to recal ibrate

may leave a pair of nlon ito rs unmatched

56 Level Trim (SCM Pro only) Provides access to an internal control that enables

adjustment o f input sensitivity Use a small flat blade screwdriver to access the

control As supplied mo nitors are calibrated to an input senSitivity o f IV

NotcAd justing th e s en ~i ti vi ty w ithout the ability to recalibrate will leave a pair

of monito rs unmatched

D ue to the rld ture of the e lect ro nICs in ATC active loud spea e rs it is quite normal

fol 0 sound to be heud from the speaker when the power is applied or

d ~sconnccted T he nOlsc hea rd will nor dam ge rhe ~peJker Zlnd is qUite normal

A lthogh ATC scs the higho-gnde components a differenl nOISe may be heard

from cach speJker due to ~ l lamph l to lu ancc variations m the amplifier components

LteI Tnm

(SCM P 0 on ly)

6 Listening

The ear and brilln tend to intc lpret distorted sound as loudness and thus

underestimate the actua l level of undisltorted sound The SCM SO 100 and I SO like

all ATe monitor S demol1scl ates very much lower levels of distortion than

convent iona l systems of 1 sim ilar size and it is therefo re advisable to begin lisLening

at an artificially low evel and G refully increase the volume It is also possible for the

SCM50 100 or 150 to produce su fficient sound pressure levels for you r ears

t hemselve s to become a source of distonion and make the sound appear harsh Any

aud ible distortion ind icates that either the system or your ears are being ove rlo aded

and that the volume level should be reduced

Ampll lUC

Cut-off F (-6d8 fre

Malch d

D hiprsio

Max Cun

Crossov~

Input Co

Inpul Slr

S~h~il

Illplll ln11

Arnplifit

Ov r103d

811 Boo

Cbln ltI

Overal l V

PoWr~ Rc

Stot nd5l8

Cabine-t I

~tgtOM

jut 5pMraili

-c rQampf

7 Ca

High ted

and with

use N o n

] Heavy so

househol

There an

or that v

kind of rc

There an

of any rr

consultar

of each p

4

II

SCM50100150ASL

4 S i gnal Cable Option s

Balanced ( able (ollfigUI allon is (he pr O(e(red

option however unbalanced cOllnection is pOi sible

Diagrams 2 and 3 illustrate [he signal ca ble

conneCtions required for each o ptto n Balanced

(XLR to XLR) co one tlon offe rs lower noise and

better immurlly to hum plCk-p U nbalanced

(XU to Phono or Two Pole Jack) ( n eClion

carTIes -isk of In calis d by mLiriple gnal euro Jrlhs

Hurn pi Dblerns re ulung frorr unbalanced

conneClion may be reduced b akng ONE of the

fo llowing modifications to Lh E signal cable

connections If the driving premplliler (or desk) is

double insula[ed (Ie has no mains earth)

disconnect thE sIgnal cab le scree ltI( ti le RCA Phone

plug end Alternatively disclnnet t the signal cable

screltn at (he X LR end nus seto rlcl option will Olakc

the source ( ~ refel Eme sIgnal eOir tho

S Operation

D lagl lttIll 4 il lu)CI lS d ie tOillK u middoto n ltiIJd ( l ilt I

panel Each fEalU e IS descCibed below

5 I Mains Inlet The pph~d Ill Fuwe r Ie

(appropriate to the lo cal territory) should e

connected he re Ensur e titat rhe 11In S oltage

specified on the panel corresponds w ith (he

loca l supply

52 Power Switch Switches on the mo 1(01 When

switched on the indicaror on the panel will

illuminate

53 Fuseholder Should a moniwl- fail to switch on

when the power switch is opera ted (he fuse

should be inspected Lift out the fuseholder

cover using a small flat-blade screwdriver

remove (he fuse and inspect it fo r damage If

required a ep lacement fuse should be fitted It

should be stressed however that fuses mo ~[

often fail only because of a ~erious e lecLrical

fault If this is the case then simply replacing the

fuse Will only result in another fuse fail c -e The

monitor should be returned to ATe if a second

fuse fails

54 Input SocketThe audo signal ca ble should be

connected here Balan ced or unbalanced cables

may be used (See Section 3)

55 Bau Boost (SCM Pro only) Provdes up to

6dB of gain in the -egion of 40Hz Use a small

flat blad ~HrewdrlLl ((I ac eS$ [he control Add s ID r C w rmth and energy to

the lowe r f(equenli~s in music at (he expense of accurate transiem

reproduct ion Note Adj us ting the bass boost without the ab ility to recal ibrate

may leave a pair of nlon ito rs unmatched

56 Level Trim (SCM Pro only) Provides access to an internal control that enables

adjustment o f input sensitivity Use a small flat blade screwdriver to access the

control As supplied mo nitors are calibrated to an input senSitivity o f IV

NotcAd justing th e s en ~i ti vi ty w ithout the ability to recalibrate will leave a pair

of monito rs unmatched

D ue to the rld ture of the e lect ro nICs in ATC active loud spea e rs it is quite normal

fol 0 sound to be heud from the speaker when the power is applied or

d ~sconnccted T he nOlsc hea rd will nor dam ge rhe ~peJker Zlnd is qUite normal

A lthogh ATC scs the higho-gnde components a differenl nOISe may be heard

from cach speJker due to ~ l lamph l to lu ancc variations m the amplifier components

LteI Tnm

(SCM P 0 on ly)

6 Listening

The ear and brilln tend to intc lpret distorted sound as loudness and thus

underestimate the actua l level of undisltorted sound The SCM SO 100 and I SO like

all ATe monitor S demol1scl ates very much lower levels of distortion than

convent iona l systems of 1 sim ilar size and it is therefo re advisable to begin lisLening

at an artificially low evel and G refully increase the volume It is also possible for the

SCM50 100 or 150 to produce su fficient sound pressure levels for you r ears

t hemselve s to become a source of distonion and make the sound appear harsh Any

aud ible distortion ind icates that either the system or your ears are being ove rlo aded

and that the volume level should be reduced

Ampll lUC

Cut-off F (-6d8 fre

Malch d

D hiprsio

Max Cun

Crossov~

Input Co

Inpul Slr

S~h~il

Illplll ln11

Arnplifit

Ov r103d

811 Boo

Cbln ltI

Overal l V

PoWr~ Rc

Stot nd5l8

Cabine-t I

~tgtOM

jut 5pMraili

-c rQampf

7 Ca

High ted

and with

use N o n

] Heavy so

househol

There an

or that v

kind of rc

There an

of any rr

consultar

of each p

4

s P E ci fie a t ion 5 SCMSOIOOISOASL

I SCMSOASL SCMIOOASL SCMISOASL

lnd energy to Driven HF 25mm (I ) 2Smm (I) 25mm (I) ate trans iem MF 75mm (3) 75mm (3) 75mm (3)

to recalibrate LF 234mm (9) 314mm (12) 375mm (15)

An1plitlld~ l ineadty - Zd---7------ 12 H7----- 65Hz - 12kH- --- 60Hz - -H-------------- shyt - - 8 -=OHz - k7 z z - - 12k 7 z C utmiddot off FrequIncic5 ---- ----- - ---- shy

I that enables (-6dB rec standi ng) 38Hz amp 20kHz 32Hz amp 20kHz 25Hz amp 20kHz

to access the iO5dB --- shyMatched Response iO5dB iOSdB sitivity of IV Dispersion ill leave a pair HorlzOflL11 tao Coherent plusmnaoo Coherent plusmnao Coherent

Vertica plusmn 10deg Coherent plusmn 10 Coherenl plusmn I 0deg Coherent

Max Conllnuoul SPL I 12dB SPL I metro I I SdS 5PL I metre 117dB SPL I metre

quite normal Crossover Frequen 380Hz and 35kHz 380Hz and 3SkHz 380Hz and 35kHz

is applied or PUc COllnettor Malo XLR Male XLR Male XLR

quite normal Input Srnlti ty IOV Balanced IOV Balanced IOV Balanced

may be heard Seruitivlty Trim i6dB (SCM Pro Only) i6dB (SCM Pro Only) i6dB (SCM Pro Only)

omponents Input Imptd In(~ gtIOkOh ms gttOk Ohms gtIOkOhms

Amphfirr OUtp~lt

pInel LF 200 Watts RMS 200 Watts RMS 200 Watts RMS ~IF 100Wam RMS 100 Watts RMS 100 WattS RMS Hf 50 Watts RMS SO Watts RMS SO Wa tts RMS

only ) Olt t IOiild PlotttCiu All p rOd ~J( t5 Active Mon I1UI Ga in Reduction on all ampl lfi t r plus Tweeter LDR pro te ction

B Boon (SCI-I P uH Only) 0 to +6dS 40Hz

Cablncot DlmeioI15 (HxWxD) 717 x 304 x 480mrfl

Overall W~ight 489kg ( I 07Slbl

Power Requirementsect Voltag eshy 100 115 DOV

Fequen cy SO60Hz

Stand5JBrackecs Hi -FI products on ly Floo r nands Included

Cabinet flnhhl~ All products Standard fel l woo d ven eers are avulablc 111 Black Ash Mahogany C he rr y and f lalUfal Oak Other veneers and finish es can be supplied to special order

y j

~ss and thus

and 150 like

tortion than

)egin listening

)ssible for the

or your ears

oar harsh Any

g overloaded

$poI( tf tlOI (OrIpqmiddotNUIttoI~1Al nII nwrdl ~1 r rli~ LlNbnlsectpc1 llon N o 11 17 Sor- S1i ltWIcorlSft 1middot Pt~

IEFf SplaquofiCJI)(I(I SUII (b td No 21 1_1 97 5

TC mr bullbull 1h 0 11[ Ig nry PQ~UU Wid ~1i ~s ~ pnor gtCU A~Ill( Tr~nI ltluc r C o II U1UJrn r OWl_ ~ndATC

u u rlu~ ucilt ~k c l lQudtpuQr ToJJ hnDiQf) lII

7 Care and Maintenance

High technology material finishes are used in thiS productThe suriaces 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 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 malfunc tion repair should be referred to either the supplying dealer or

consultant the relevanlt importer or ATe ATe has every confidence in the quality

of each product tha[ it manufactures

8 Warranty and Contact

All ATe products are guaranteed against any defect

in materials or workmanship for a period of two

years from the date of purchaseWithin this period

we will supply replacement parts free of charge

provided that the failure was not caused by misuse

accident or negligence

PUtCh ol r who conlplettmiddot olnd return th e

Warranty C1f d w ill hav thfir warranty period

tltteruJlJ up (0 ape iod (I( Jo jx yarli rrOfr1 [h e

dtu uf plIrchnmiddot Thi1i gulranrl( dofs not hnlir

stJtlIlnry rtghta

ATe can be contacted at

Loudspeaker Technology Ltd Gypsy LaneAston

Down Scroud GlouceS(ershire GL6 8HR UK

Telephone 01285 760561

Fax 01285 760683

Email infoatcgbnet

Websie wwwa[cgbnet

5

I Unpacking and Handling

The SCM50 100 and 150 are large heavy items and

should be handled with care Always employ a

second person to assist in moving it Unpacking

them requires a large open space preferably near

their final position

First lay the carton down and open the flaps on

its side While holding the flaps apart turn the

carton over sO the ope n side is on the ncar

Lift the outer canon off [he inner packing

Remove the end pad from the bottom of the

monitor

The mon itor can now be stood upright and the

remainder of the packaging removed

2 Monitor Pl acement

The subj ecti ve performa nce of any monitor

loud speaker will be fundamenta lly influenced by

the acoustic character of the room in which it is

used and its position within [he room Most ohen

mon itors are installed in rooms which are

comfortable to sit and talk in A mixture of

carpets curta ins and son furn ishings will help

ensure that middle and high frequencies are

reasonably well controlledThere 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 Sta rt with them positioned on appropriate

stands around I metre (rom 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 idea to

experiment with both the lis tening and speaker

position until a good compromise is reached For

professional installations the requirements ar e

often very specific Please consult with an

experien ced professional acoustician if necessary

Monitors with an asymetri( driver array should be

pOSitioned such that the midrange driver and tweeter

are inboard

3 Amplification

The choice of parmering amplifier (or the monitors will have significant influence on

the performance of the system Consider the following when selecting rhe amplifier

bull With any passive loudspeaker there is a trade-off between low frequency

extension and sensitivity The monitors extended low frequency response means

that its sensitivity is relatively low It is advisable therefore to select an amplifier of

relatively high powe r 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 damp ing at low frequencies is

acceptable

bull Thanks in pan to Super Linear technology and underhung voice coit construction

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 the

monitors with your proposed amplifier and ancillary system

4 Connection

The monitors are equipped with a tri middotwire connection panel that enables separate

ampl ification of the bass driver mid driver and tweeter Remove the linking bars

between the three pairs of terminals if you wish to take advantage of the trimiddotwire

facility

The terminals can accomodate either stripped cable ends or 4mm plugs Always use

good quality speaker cable with a 25mm1 minimum cross sectional area per

conductor (79 strand) Cable of a smaller cross sectional area or fewe r strands is

unsuitable For cable runs longer than 10m use a Significantly heavier gauge cable

Consult your dealer or consultant (or speCific cable recommendations

Ensure that the positive and negative terminals on each connection panel are

connected back [0 [he corresponding positive and negative [erminals on [he amplifier

6

fluence on

amplifier

frequency

se means

mplifier of

II result in

fe or solid

efully to

Jencies is

1strunion

Is but also

distortion

sly reveal

lition the

s separate

1king bars

Ie tri-wire

Iways use

area per

strands is

Jge cable

panel are

amplifier

S Listening

The ear and brain tend to incerpret distorted sound as loudness and thus

underestimate the actual level of undistorted sound The SCM50 100 and 150 like

all ATC monicors demonstrate very much lower levels of distortion than

convemional s~stems 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

SCM 50 100 and 150 to produce suffic ient sound pressure levels for your ears

themselves to become a source of distortion and make the sound appear harsh Any

audible distortion indicates that either the system or your ears are being overloaded

and that the volume level should be reduced

6 Care and Maintenanc e

High technology material fonishes 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 middot

household cleaner

There are no components within the speaker that can be considered expendable

ar chac would benefit from regular maintenance There is no requirement for any

kind of routine service work and there is no schedule for prevemative 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 supp lying dealer or

consultant the relevant importer or ATe ATC has every confidence in the quality

of each product that it manufactures

7 Warranty and Contact

All ATC prod uc ts are guaranteed against any defect in materials or workmanship for

a period of twO years from the date of purchase Within th is period we will supply

replacement parts free of charge provided that the failure was not caused by misuse

accidem or negligence

PUt hdlo~r~ who curnplcl c and re[url l the W11f anty Catmiddotd will have their

wu rJllt) periorf extended up co a p ilgtd ur six ye an rron the date or purchlSc Thl co guarantee does not iiI nil ~tdtutory rights

ATC can be contacted at

Loudspeaker Technology Ltd Gypsy Lane Aston

Down Stroud Gloucestershire GL6 8HR UK

Telephone 01285 76056 1

Fax 01285 760683

Email infoatcgbnet

Website wwwatcgbnet

7

fluence on

amplifier

frequency

se means

mplifier of

II result in

fe or solid

efully to

Jencies is

1strunion

Is but also

distortion

sly reveal

lition the

s separate

1king bars

Ie tri-wire

Iways use

area per

strands is

Jge cable

panel are

amplifier

S Listening

The ear and brain tend to incerpret distorted sound as loudness and thus

underestimate the actual level of undistorted sound The SCM50 100 and 150 like

all ATC monicors demonstrate very much lower levels of distortion than

convemional s~stems 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

SCM 50 100 and 150 to produce suffic ient sound pressure levels for your ears

themselves to become a source of distortion and make the sound appear harsh Any

audible distortion indicates that either the system or your ears are being overloaded

and that the volume level should be reduced

6 Care and Maintenanc e

High technology material fonishes 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 middot

household cleaner

There are no components within the speaker that can be considered expendable

ar chac would benefit from regular maintenance There is no requirement for any

kind of routine service work and there is no schedule for prevemative 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 supp lying dealer or

consultant the relevant importer or ATe ATC has every confidence in the quality

of each product that it manufactures

7 Warranty and Contact

All ATC prod uc ts are guaranteed against any defect in materials or workmanship for

a period of twO years from the date of purchase Within th is period we will supply

replacement parts free of charge provided that the failure was not caused by misuse

accidem or negligence

PUt hdlo~r~ who curnplcl c and re[url l the W11f anty Catmiddotd will have their

wu rJllt) periorf extended up co a p ilgtd ur six ye an rron the date or purchlSc Thl co guarantee does not iiI nil ~tdtutory rights

ATC can be contacted at

Loudspeaker Technology Ltd Gypsy Lane Aston

Down Stroud Gloucestershire GL6 8HR UK

Telephone 01285 76056 1

Fax 01285 760683

Email infoatcgbnet

Website wwwatcgbnet

7

pecificat ons

SCMIOOSL SCMISOSLISCMSOSL

HF HF LF

Arnphnld( Lill i iii I it tldS

Cut-otl FI r4enCIligt

( 6JB t e tilndm

r-fJhhed R purlH

ObI 11i fl

H CIP ll l1

rl 1

CUSU) t T Ft- rn

nput Contll (fflr

S omiddot til it

Rte- onHl ndcd Pot I

Arnphfill

CPlntFt Drlll - ( I h W ()

0 bullbullbull II Nc~hL

Cabinet Flnl lu ~

25mm ( I) 75mm (3) 234mm (9)

70Hz - 12kHz

38Hz amp 20kH z

to5d8

plusmnBO~ Coherent plusmn I Omiddot Co he rent

I 12a B SPL I morr

380Hz and 15kHz

25mm ( I) 75mm (J) 3 14mm ( 12)

65Hz - 12kHz

32Hz amp 20kHz

to5dB

taoOCoherent

plusmn 1 0 Coherent

115dB SPL I metre

380Hz nd 35kHz

All products Bind ing PosLS4mm Sockets (Tn-W ire capable)

85dB I W an

8 Ohms

100 ISOD Walls

I metre 88dB I Waclt

8 Ohms

I 00 I 500 W gttlt

I merre

717 x 304 )( 425m

411 kg (905 Ib)

n- 834 x 400 x 5JOm

570kg ( 126 5Ib)

m

H-F pro ducu only Floor suods Uld uded

25mm (I ) 75mm (3) 375mm ( 15)

60Hz - 12kHz

25Hz amp 20kHz

to5d8

plusmn80deg Coherent t I 0 deg Coherent

117dB SPL I metre

180Hz and l5kHz

90dB I W att I merre

a Ohms

100middot1500 Wam

884 x 498 x 511mm

672kg (14B llb)

AU prodccu Stancbrd reiJ wood vcnters arc ava ilable to Black Ash Mahogany Che rry and Natu ra Oak O ther veneers Jn d fin ishes can b~ stJpplied to special order

IEFE Speaampiull()A SuNk ~ Nt l IYmiddot PHS

Ale I~n tbt r~ tc 1 productgt -4 PKo(llJOtll wtJooJ(PfOUl ioOlI ~ Moutl(lnnukxH Cc II ~ tnldWI tfil ATC

II tN il1-tu-td III IlQlIo CIf LCrud~__ TcQn Ltd

8