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I n s t a l l a t i o n   c o n t ’ d

4

SCM200/300ASL/P4

Diagram 1 - input connection pins

Diagram 3 - balanced cable

Diagram 4 - unbalanced cable

Pin 1, Screen

Pin 2, Signal (hot)

Two Core Screened Cable

Pin 3, Signal (return)

3 Pin Male XLR

Connector

3 Pin Female XLR

Connector

To Monitor Input

Hot

Return

Screen

To Source Output

Diagram 2 - speaker plug

1

2

3

1

2

3

Two Core Screened Cable

3 Pin Male XLR

Connector

Phono (RCA)

Connector

To Monitor Input

Hot

Return

Screen

To Source Output

1

2

3

5 . S y s t e m   C o n n e c t i o n s

Three cable connections are required for each P4

and monitor: one for mains power, one for the

audio signal and one for the speaker cable.

The mains cable is specifically supplied to comply

with local statutory safety approvals and

alternatives should not be substituted. If you intend

to use your monitors in an alternative territory

please contact ATC for advice. The mains

connection must always be earthed.

The signal cable and plug (not necessarily supplied)

should be of a good quality and XLR terminated.

Poor cable and plug quality will compromise the

performance of your monitors.The signal input pin

configuration is illustrated in Diagram 1.

Custom made 5 metre speaker cables and plugs

are supplied as standard with the P4. Speaker

cables of up to 10 metres are available. Runs up to

20 metres may be made up by splicing heavier

gauge (4mm

2)

cable to 10 metre lengths.The splice

point should be 0.5 metres before the connector.

The 8-pin speaker connector scheme is illustrated

in Diagram 2.

6 . S i g n a l   C a b l e   O p t i o n s

Balanced cable configuration is the preferred

option, however unbalanced connection is

possible. Diagrams 3 and 4 illustrate the signal

cable connections required for each option.

Balanced (XLR to XLR) connection offers lower

noise and better immunity to “hum” pick-up.

Unbalanced (XLR to Phono or Two Pole Jack)

connection carries risk of hum caused 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.

A

H

B

C

D

E

F

G

Pin

Connection

A

LF 1 Positive

B

LF 2 Positive

C

MF Positive

D

HF Positive

E

HF Negative

F

MF Negative

G

LF 1 Negative

H

LF 2 Negative

Содержание P4

Страница 1: ...SCM200 SCM300 P4 User Manual SCM200ASL SCM300ASL P4 POWER AMPLIFIER MULTICHANNEL A C O U S T I C E N G I N E E R S ...

Страница 2: ...nstructions or as marked on the appliance 9 Power cord protection power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them paying particular attention to cords at plugs convenience receptacles and the point where they exit the appliance 10 Cleaning the appliance should be cleaned only as recommended by the manufacturer 11 Unatt...

Страница 3: ...ten associated with aerospace or motorsport But the results are worth the effort and the cost ATC loudspeakers with their unique in house designed drivers combine the best of hi fi and professional to devastating effect ATC has become synonymous with active systems Choosing to offer active loudspeakers where the passive crossover network is replaced by active filters and multiple power amplifiers ...

Страница 4: ...the amplifier is in standby mode until the heatsink temperature has dropped to approximately 20 C When a P4 is switched from standby to active operation a mild thump may be heard from the unit as the main power transformer energises In order to avoid excessive in rush current if multiple P4s are connected to a single power outlet it is recommended that they are switched to active mode sequentially...

Страница 5: ...ustrated in Diagram 1 Custom made 5 metre speaker cables and plugs are supplied as standard with the P4 Speaker cables of up to 10 metres are available Runs up to 20 metres may be made up by splicing heavier gauge 4mm2 cable to 10 metre lengths The splice point should be 0 5 metres before the connector The 8 pin speaker connector scheme is illustrated in Diagram 2 6 S i g n a l C a b l e O p t i o...

Страница 6: ...in 5 5 Volts on any error including drive limit Note Pins 3 4 and 5 have a series resistance of 240 Ohms and allow sensing or drive of LED s only 5 O p e r a t i o n Diagram 5 remote interface Pin Connection 1 0 Volt 2 Standby control 3 Powered up out 4 Standby out 5 Error out 8 S t a r t U p Once the P4 and monitors are installed and all connections are made the system can be switched on Switch o...

Страница 7: ...ed sound The SCM200 and 300 like all ATC monitors demonstrates very much lower levels of distortion than conventional systems of a similar size and it is therefore advisable to begin listening at an artificially low level and carefully increase the volume It is also possible for the SCM200 or 300 to produce sufficient sound pressure levels for your ears themselves to become a source of distortion ...

Страница 8: ...Standard No 219 1975 ATC reserves the right to vary products and specifications without prior notice Acoustic Transducer Co is a trading name and ATC is the registered trade mark of Loudspeaker Technology Ltd SCM200ASL SCM300ASL P4 S p e c i f i c a t i o n s Amplifier Output LF1 275 Watts RMS into 8 Ohms LF2 275 Watts RMS into 8 Ohms MF 200 Watts RMS into 16 Ohms HF 100 Watts RMS into 6 Ohms Inpu...

Страница 9: ...U S T I C E N G I N E E R S Loudspeaker Technology Ltd Gypsy Lane Aston Down Stroud Gloucestershire GL6 8HR United Kingdom Telephone 01285 760561 Fax 01285 760683 Email info atc gb net Website www atc gb net ...

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